diff --git a/acinclude.m4 b/acinclude.m4
index 9150799..f7d7b69 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -24,7 +24,14 @@
     objfmt='a.out'
   ;;
   linux*)
-    objfmt='ELF'
+    case "$host_cpu" in
+      x86_64)
+        objfmt='ELF64'
+        ;;
+      *)
+        objfmt='ELF'
+        ;;
+    esac
   ;;
   freebsd* | netbsd* | openbsd*)
     if echo __ELF__ | $CC -E - | grep __ELF__ > /dev/null; then
@@ -58,6 +65,7 @@
   a.out)      NAFLAGS='-faout -DAOUT';;
   BSD-a.out)  NAFLAGS='-faoutb -DAOUT';;
   ELF)        NAFLAGS='-felf -DELF';;
+  ELF64)      NAFLAGS='-felf64 -DELF -D__x86_64__';;
   RDF)        NAFLAGS='-frdf -DRDF';;
   Mach-O)     NAFLAGS='-fmacho -DMACHO';;
 esac
@@ -68,7 +76,6 @@
 cat > conftest.asm <<EOF
 [%line __oline__ "configure"
         section .text
-        bits    32
         global  _main,main
 _main:
 main:   xor     eax,eax
diff --git a/configure.ac b/configure.ac
index 0245458..3bcdf43 100644
--- a/configure.ac
+++ b/configure.ac
@@ -89,10 +89,17 @@
   # Check if we're on a supported CPU
   AC_MSG_CHECKING([if host cpu type is i386 or compatible])
   case "$host_cpu" in
+    x86_64)
+      AC_MSG_RESULT(yes)
+      AC_PROG_NASM
+      AC_DEFINE([WITH_SIMD], [1], [Use accelerated SIMD routines.])
+      AC_DEFINE([WITH_SIMD64], [1], [Use x86-64 accelerated SIMD routines.])
+    ;;
     i*86 | x86 | ia32)
       AC_MSG_RESULT(yes)
       AC_PROG_NASM
       AC_DEFINE([WITH_SIMD], [1], [Use accelerated SIMD routines.])
+      SIMDDIR=simd
     ;;
     *)
       AC_MSG_RESULT([no ("$host_cpu")])
@@ -100,6 +107,7 @@
     ;;
   esac
 fi
+AM_CONDITIONAL([WITH_SIMD64], [test "x$with_simd64" != "xno"])
 AM_CONDITIONAL([WITH_SIMD], [test "x$with_simd" != "xno"])
 
 # jconfig.h is the file we use, but we have another before that to
diff --git a/jsimd.c b/jsimd.c
index 861309a..20e83fc 100644
--- a/jsimd.c
+++ b/jsimd.c
@@ -49,10 +49,12 @@
 
 #ifdef WITH_SIMD
   simd_support = jpeg_simd_cpu_support();
+  #ifndef __x86_64__
   if((env=getenv("JSIMD_FORCEMMX"))!=NULL && !strcmp(env, "1"))
     simd_support = JSIMD_MMX;
   else if((env=getenv("JSIMD_FORCESSE2"))!=NULL && !strcmp(env, "1"))
     simd_support = JSIMD_SSE2;
+  #endif
 #else
   simd_support = JSIMD_NONE;
 #endif
@@ -109,45 +111,63 @@
 {
 #ifdef WITH_SIMD
   void (*sse2fct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);
+  #ifndef __x86_64__
   void (*mmxfct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);
+  #endif
   switch(cinfo->in_color_space)
   {
     case JCS_EXT_RGB:
       sse2fct=jsimd_extrgb_ycc_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_extrgb_ycc_convert_mmx;
+      #endif
       break;
     case JCS_EXT_RGBX:
       sse2fct=jsimd_extrgbx_ycc_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_extrgbx_ycc_convert_mmx;
+      #endif
       break;
     case JCS_EXT_BGR:
       sse2fct=jsimd_extbgr_ycc_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_extbgr_ycc_convert_mmx;
+      #endif
       break;
     case JCS_EXT_BGRX:
       sse2fct=jsimd_extbgrx_ycc_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_extbgrx_ycc_convert_mmx;
+      #endif
       break;
     case JCS_EXT_XBGR:
       sse2fct=jsimd_extxbgr_ycc_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_extxbgr_ycc_convert_mmx;
+      #endif
       break;
     case JCS_EXT_XRGB:
       sse2fct=jsimd_extxrgb_ycc_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_extxrgb_ycc_convert_mmx;
+      #endif
       break;
     default:
       sse2fct=jsimd_rgb_ycc_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_rgb_ycc_convert_mmx;
+      #endif
       break;
   }
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_rgb_ycc_convert_sse2))
     sse2fct(cinfo->image_width, input_buf,
         output_buf, output_row, num_rows);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     mmxfct(cinfo->image_width, input_buf,
         output_buf, output_row, num_rows);
+  #endif
 #endif
 }
 
@@ -158,45 +178,63 @@
 {
 #ifdef WITH_SIMD
   void (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);
+  #ifndef __x86_64__
   void (*mmxfct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);
+  #endif
   switch(cinfo->out_color_space)
   {
     case JCS_EXT_RGB:
       sse2fct=jsimd_ycc_extrgb_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_ycc_extrgb_convert_mmx;
+      #endif
       break;
     case JCS_EXT_RGBX:
       sse2fct=jsimd_ycc_extrgbx_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_ycc_extrgbx_convert_mmx;
+      #endif
       break;
     case JCS_EXT_BGR:
       sse2fct=jsimd_ycc_extbgr_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_ycc_extbgr_convert_mmx;
+      #endif
       break;
     case JCS_EXT_BGRX:
       sse2fct=jsimd_ycc_extbgrx_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_ycc_extbgrx_convert_mmx;
+      #endif
       break;
     case JCS_EXT_XBGR:
       sse2fct=jsimd_ycc_extxbgr_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_ycc_extxbgr_convert_mmx;
+      #endif
       break;
     case JCS_EXT_XRGB:
       sse2fct=jsimd_ycc_extxrgb_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_ycc_extxrgb_convert_mmx;
+      #endif
       break;
     default:
       sse2fct=jsimd_ycc_rgb_convert_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_ycc_rgb_convert_mmx;
+      #endif
       break;
   }
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_ycc_rgb_convert_sse2))
     sse2fct(cinfo->output_width, input_buf,
         input_row, output_buf, num_rows);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     mmxfct(cinfo->output_width, input_buf,
         input_row, output_buf, num_rows);
+  #endif
 #endif
 }
 
@@ -213,8 +251,10 @@
 
   if (simd_support & JSIMD_SSE2)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -232,8 +272,10 @@
 
   if (simd_support & JSIMD_SSE2)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -247,10 +289,12 @@
     jsimd_h2v2_downsample_sse2(cinfo->image_width, cinfo->max_v_samp_factor,
         compptr->v_samp_factor, compptr->width_in_blocks,
         input_data, output_data);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_h2v2_downsample_mmx(cinfo->image_width, cinfo->max_v_samp_factor,
         compptr->v_samp_factor, compptr->width_in_blocks,
         input_data, output_data);
+  #endif
 #endif
 }
 
@@ -263,10 +307,12 @@
     jsimd_h2v1_downsample_sse2(cinfo->image_width, cinfo->max_v_samp_factor,
         compptr->v_samp_factor, compptr->width_in_blocks,
         input_data, output_data);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_h2v1_downsample_mmx(cinfo->image_width, cinfo->max_v_samp_factor,
         compptr->v_samp_factor, compptr->width_in_blocks,
         input_data, output_data);
+  #endif
 #endif
 }
 
@@ -283,8 +329,10 @@
 
   if (simd_support & JSIMD_SSE2)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -302,8 +350,10 @@
 
   if (simd_support & JSIMD_SSE2)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -318,9 +368,11 @@
   if (simd_support & JSIMD_SSE2)
     jsimd_h2v2_upsample_sse2(cinfo->max_v_samp_factor,
         cinfo->output_width, input_data, output_data_ptr);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_h2v2_upsample_mmx(cinfo->max_v_samp_factor,
         cinfo->output_width, input_data, output_data_ptr);
+  #endif
 #endif
 }
 
@@ -334,9 +386,11 @@
   if (simd_support & JSIMD_SSE2)
     jsimd_h2v1_upsample_sse2(cinfo->max_v_samp_factor,
         cinfo->output_width, input_data, output_data_ptr);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_h2v1_upsample_mmx(cinfo->max_v_samp_factor,
         cinfo->output_width, input_data, output_data_ptr);
+  #endif
 #endif
 }
 
@@ -354,8 +408,10 @@
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -374,8 +430,10 @@
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -391,9 +449,11 @@
       IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
     jsimd_h2v1_fancy_upsample_sse2(cinfo->max_v_samp_factor,
         compptr->downsampled_width, input_data, output_data_ptr);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_h2v2_fancy_upsample_mmx(cinfo->max_v_samp_factor,
         compptr->downsampled_width, input_data, output_data_ptr);
+  #endif
 #endif
 }
 
@@ -408,9 +468,11 @@
       IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
     jsimd_h2v1_fancy_upsample_sse2(cinfo->max_v_samp_factor,
         compptr->downsampled_width, input_data, output_data_ptr);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_h2v1_fancy_upsample_mmx(cinfo->max_v_samp_factor,
         compptr->downsampled_width, input_data, output_data_ptr);
+  #endif
 #endif
 }
 
@@ -428,8 +490,10 @@
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -448,8 +512,10 @@
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -462,45 +528,63 @@
 {
 #ifdef WITH_SIMD
   void (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);
+  #ifndef __x86_64__
   void (*mmxfct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);
+  #endif
   switch(cinfo->out_color_space)
   {
     case JCS_EXT_RGB:
       sse2fct=jsimd_h2v2_extrgb_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v2_extrgb_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_RGBX:
       sse2fct=jsimd_h2v2_extrgbx_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v2_extrgbx_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_BGR:
       sse2fct=jsimd_h2v2_extbgr_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v2_extbgr_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_BGRX:
       sse2fct=jsimd_h2v2_extbgrx_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v2_extbgrx_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_XBGR:
       sse2fct=jsimd_h2v2_extxbgr_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v2_extxbgr_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_XRGB:
       sse2fct=jsimd_h2v2_extxrgb_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v2_extxrgb_merged_upsample_mmx;
+      #endif
       break;
     default:
       sse2fct=jsimd_h2v2_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v2_merged_upsample_mmx;
+      #endif
       break;
   }
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
     sse2fct(cinfo->output_width, input_buf,
         in_row_group_ctr, output_buf);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     mmxfct(cinfo->output_width, input_buf,
         in_row_group_ctr, output_buf);
+  #endif
 #endif
 }
 
@@ -512,45 +596,63 @@
 {
 #ifdef WITH_SIMD
   void (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);
+  #ifndef __x86_64__
   void (*mmxfct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);
+  #endif
   switch(cinfo->out_color_space)
   {
     case JCS_EXT_RGB:
       sse2fct=jsimd_h2v1_extrgb_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v1_extrgb_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_RGBX:
       sse2fct=jsimd_h2v1_extrgbx_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v1_extrgbx_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_BGR:
       sse2fct=jsimd_h2v1_extbgr_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v1_extbgr_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_BGRX:
       sse2fct=jsimd_h2v1_extbgrx_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v1_extbgrx_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_XBGR:
       sse2fct=jsimd_h2v1_extxbgr_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v1_extxbgr_merged_upsample_mmx;
+      #endif
       break;
     case JCS_EXT_XRGB:
       sse2fct=jsimd_h2v1_extxrgb_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v1_extxrgb_merged_upsample_mmx;
+      #endif
       break;
     default:
       sse2fct=jsimd_h2v1_merged_upsample_sse2;
+      #ifndef __x86_64__
       mmxfct=jsimd_h2v1_merged_upsample_mmx;
+      #endif
       break;
   }
   if ((simd_support & JSIMD_SSE2) &&
       IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
     sse2fct(cinfo->output_width, input_buf,
         in_row_group_ctr, output_buf);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     mmxfct(cinfo->output_width, input_buf,
         in_row_group_ctr, output_buf);
+  #endif
 #endif
 }
 
@@ -571,8 +673,10 @@
 
   if (simd_support & JSIMD_SSE2)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -596,8 +700,10 @@
     return 1;
   if (simd_support & JSIMD_SSE)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_3DNOW)
     return 1;
+  #endif
 
   return 0;
 }
@@ -609,8 +715,10 @@
 #ifdef WITH_SIMD
   if (simd_support & JSIMD_SSE2)
     jsimd_convsamp_sse2(sample_data, start_col, workspace);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_convsamp_mmx(sample_data, start_col, workspace);
+  #endif
 #endif
 }
 
@@ -621,10 +729,12 @@
 #ifdef WITH_SIMD
   if (simd_support & JSIMD_SSE2)
     jsimd_convsamp_float_sse2(sample_data, start_col, workspace);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_SSE)
     jsimd_convsamp_float_sse(sample_data, start_col, workspace);
   else if (simd_support & JSIMD_3DNOW)
     jsimd_convsamp_float_3dnow(sample_data, start_col, workspace);
+  #endif
 #endif
 }
 
@@ -641,8 +751,10 @@
 
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_fdct_islow_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -660,8 +772,10 @@
 
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_fdct_ifast_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -679,8 +793,10 @@
 
   if ((simd_support & JSIMD_SSE) && IS_ALIGNED_SSE(jconst_fdct_float_sse))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_3DNOW)
     return 1;
+  #endif
 
   return 0;
 }
@@ -691,8 +807,10 @@
 #ifdef WITH_SIMD
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_fdct_islow_sse2))
     jsimd_fdct_islow_sse2(data);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_fdct_islow_mmx(data);
+  #endif
 #endif
 }
 
@@ -702,8 +820,10 @@
 #ifdef WITH_SIMD
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_fdct_islow_sse2))
     jsimd_fdct_ifast_sse2(data);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_fdct_ifast_mmx(data);
+  #endif
 #endif
 }
 
@@ -713,8 +833,10 @@
 #ifdef WITH_SIMD
   if ((simd_support & JSIMD_SSE) && IS_ALIGNED_SSE(jconst_fdct_float_sse))
     jsimd_fdct_float_sse(data);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_3DNOW)
     jsimd_fdct_float_3dnow(data);
+  #endif
 #endif
 }
 
@@ -733,8 +855,10 @@
 
   if (simd_support & JSIMD_SSE2)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -756,8 +880,10 @@
     return 1;
   if (simd_support & JSIMD_SSE)
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_3DNOW)
     return 1;
+  #endif
 
   return 0;
 }
@@ -769,8 +895,10 @@
 #ifdef WITH_SIMD
   if (simd_support & JSIMD_SSE2)
     jsimd_quantize_sse2(coef_block, divisors, workspace);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_quantize_mmx(coef_block, divisors, workspace);
+  #endif
 #endif
 }
 
@@ -781,10 +909,12 @@
 #ifdef WITH_SIMD
   if (simd_support & JSIMD_SSE2)
     jsimd_quantize_float_sse2(coef_block, divisors, workspace);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_SSE)
     jsimd_quantize_float_sse(coef_block, divisors, workspace);
   else if (simd_support & JSIMD_3DNOW)
     jsimd_quantize_float_3dnow(coef_block, divisors, workspace);
+  #endif
 #endif
 }
 
@@ -807,8 +937,10 @@
 
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_red_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -832,8 +964,10 @@
 
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_red_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -846,8 +980,10 @@
 #if WITH_SIMD
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_red_sse2))
     jsimd_idct_2x2_sse2(compptr->dct_table, coef_block, output_buf, output_col);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_idct_2x2_mmx(compptr->dct_table, coef_block, output_buf, output_col);
+  #endif
 #endif
 }
 
@@ -859,8 +995,10 @@
 #if WITH_SIMD
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_red_sse2))
     jsimd_idct_4x4_sse2(compptr->dct_table, coef_block, output_buf, output_col);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_idct_4x4_mmx(compptr->dct_table, coef_block, output_buf, output_col);
+  #endif
 #endif
 }
 
@@ -883,8 +1021,10 @@
 
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_islow_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -910,8 +1050,10 @@
 
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_ifast_sse2))
     return 1;
+  #ifndef __x86_64__
   if (simd_support & JSIMD_MMX)
     return 1;
+  #endif
 
   return 0;
 }
@@ -936,10 +1078,12 @@
 
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_float_sse2))
     return 1;
+  #ifndef __x86_64__
   if ((simd_support & JSIMD_SSE) && IS_ALIGNED_SSE(jconst_idct_float_sse))
     return 1;
   if (simd_support & JSIMD_3DNOW)
     return 1;
+  #endif
 
   return 0;
 }
@@ -952,8 +1096,10 @@
 #if WITH_SIMD
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_islow_sse2))
     jsimd_idct_islow_sse2(compptr->dct_table, coef_block, output_buf, output_col);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_idct_islow_mmx(compptr->dct_table, coef_block, output_buf, output_col);
+  #endif
 #endif
 }
 
@@ -965,8 +1111,10 @@
 #if WITH_SIMD
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_ifast_sse2))
     jsimd_idct_ifast_sse2(compptr->dct_table, coef_block, output_buf, output_col);
+  #ifndef __x86_64__
   else if (simd_support & JSIMD_MMX)
     jsimd_idct_ifast_mmx(compptr->dct_table, coef_block, output_buf, output_col);
+  #endif
 #endif
 }
 
@@ -979,12 +1127,14 @@
   if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_float_sse2))
     jsimd_idct_float_sse2(compptr->dct_table, coef_block,
         output_buf, output_col);
+  #ifndef __x86_64__
   else if ((simd_support & JSIMD_SSE) && IS_ALIGNED_SSE(jconst_idct_float_sse))
     jsimd_idct_float_sse(compptr->dct_table, coef_block,
         output_buf, output_col);
   else if (simd_support & JSIMD_3DNOW)
     jsimd_idct_float_3dnow(compptr->dct_table, coef_block,
         output_buf, output_col);
+  #endif
 #endif
 }
 
diff --git a/simd/Makefile.am b/simd/Makefile.am
index 78516f0..da7d684 100644
--- a/simd/Makefile.am
+++ b/simd/Makefile.am
@@ -4,6 +4,23 @@
 
 EXTRA_DIST = nasm_lt.sh
 
+if WITH_SIMD64
+
+libsimd_la_SOURCES = jsimd.h jsimdcfg.inc.h \
+	jsimdext.inc jcolsamp.inc jdct.inc \
+	jsimdcpu-64.asm jfsseflt-64.asm \
+	jccolss2-64.asm jdcolss2-64.asm \
+	jcsamss2-64.asm jdsamss2-64.asm jdmerss2-64.asm \
+	jcqnts2i-64.asm jfss2fst-64.asm jfss2int-64.asm \
+	jiss2red-64.asm jiss2int-64.asm jiss2fst-64.asm \
+	jcqnts2f-64.asm jiss2flt-64.asm
+
+jccolss2-64.lo: jcclrss2-64.asm
+jdcolss2-64.lo: jdclrss2-64.asm
+jdmerss2-64.lo: jdmrgss2-64.asm
+
+else
+
 libsimd_la_SOURCES = jsimd.h jsimdcfg.inc.h \
 	jsimdext.inc jcolsamp.inc jdct.inc \
 	jsimdcpu.asm \
@@ -26,6 +43,8 @@
 jdmermmx.lo: jdmrgmmx.asm
 jdmerss2.lo: jdmrgss2.asm
 
+endif
+
 .asm.lo:
 	$(LIBTOOL) --mode=compile --tag NASM ./nasm_lt.sh $(NASM) $(NAFLAGS) $< -o $@
 
diff --git a/simd/jcclrss2-64.asm b/simd/jcclrss2-64.asm
new file mode 100644
index 0000000..9900edd
--- /dev/null
+++ b/simd/jcclrss2-64.asm
@@ -0,0 +1,484 @@
+;
+; jcclrss2.asm - colorspace conversion (64-bit SSE2)
+;
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; Copyright (C) 2009, D. R. Commander.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jcolsamp.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Convert some rows of samples to the output colorspace.
+;
+; GLOBAL(void)
+; jsimd_rgb_ycc_convert_sse2 (JDIMENSION img_width,
+;                             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+;                             JDIMENSION output_row, int num_rows);
+;
+
+; r10 = JDIMENSION img_width
+; r11 = JSAMPARRAY input_buf
+; r12 = JSAMPIMAGE output_buf
+; r13 = JDIMENSION output_row
+; r14 = int num_rows
+
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		8
+
+	align	16
+
+	global	EXTN(jsimd_rgb_ycc_convert_sse2)
+
+EXTN(jsimd_rgb_ycc_convert_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	push	rbx
+	collect_args
+
+	mov	rcx, r10
+	test	rcx,rcx
+	jz	near .return
+
+	push	rcx
+
+	mov rsi, r12
+	mov rcx, r13
+	mov	rdi, JSAMPARRAY [rsi+0*SIZEOF_JSAMPARRAY]
+	mov	rbx, JSAMPARRAY [rsi+1*SIZEOF_JSAMPARRAY]
+	mov	rdx, JSAMPARRAY [rsi+2*SIZEOF_JSAMPARRAY]
+	lea	rdi, [rdi+rcx*SIZEOF_JSAMPROW]
+	lea	rbx, [rbx+rcx*SIZEOF_JSAMPROW]
+	lea	rdx, [rdx+rcx*SIZEOF_JSAMPROW]
+
+	pop	rcx
+
+	mov rsi, r11
+	mov	rax, r14
+	test	rax,rax
+	jle	near .return
+.rowloop:
+	push	rdx
+	push	rbx
+	push	rdi
+	push	rsi
+	push	rcx			; col
+
+	mov	rsi, JSAMPROW [rsi]	; inptr
+	mov	rdi, JSAMPROW [rdi]	; outptr0
+	mov	rbx, JSAMPROW [rbx]	; outptr1
+	mov	rdx, JSAMPROW [rdx]	; outptr2
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	near .columnloop
+
+%if RGB_PIXELSIZE == 3 ; ---------------
+
+.column_ld1:
+	push	rax
+	push	rdx
+	lea	rcx,[rcx+rcx*2]		; imul ecx,RGB_PIXELSIZE
+	test	cl, SIZEOF_BYTE
+	jz	short .column_ld2
+	sub	rcx, byte SIZEOF_BYTE
+	movzx	rax, BYTE [rsi+rcx]
+.column_ld2:
+	test	cl, SIZEOF_WORD
+	jz	short .column_ld4
+	sub	rcx, byte SIZEOF_WORD
+	movzx	rdx, WORD [rsi+rcx]
+	shl	rax, WORD_BIT
+	or	rax,rdx
+.column_ld4:
+	movd	xmmA,eax
+	pop	rdx
+	pop	rax
+	test	cl, SIZEOF_DWORD
+	jz	short .column_ld8
+	sub	rcx, byte SIZEOF_DWORD
+	movd	xmmF, XMM_DWORD [rsi+rcx]
+	pslldq	xmmA, SIZEOF_DWORD
+	por	xmmA,xmmF
+.column_ld8:
+	test	cl, SIZEOF_MMWORD
+	jz	short .column_ld16
+	sub	rcx, byte SIZEOF_MMWORD
+	movq	xmmB, XMM_MMWORD [rsi+rcx]
+	pslldq	xmmA, SIZEOF_MMWORD
+	por	xmmA,xmmB
+.column_ld16:
+	test	cl, SIZEOF_XMMWORD
+	jz	short .column_ld32
+	movdqa	xmmF,xmmA
+	movdqu	xmmA, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	mov	rcx, SIZEOF_XMMWORD
+	jmp	short .rgb_ycc_cnv
+.column_ld32:
+	test	cl, 2*SIZEOF_XMMWORD
+	mov	rcx, SIZEOF_XMMWORD
+	jz	short .rgb_ycc_cnv
+	movdqa	xmmB,xmmA
+	movdqu	xmmA, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqu	xmmF, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+	jmp	short .rgb_ycc_cnv
+
+.columnloop:
+	movdqu	xmmA, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqu	xmmF, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+	movdqu	xmmB, XMMWORD [rsi+2*SIZEOF_XMMWORD]
+
+.rgb_ycc_cnv:
+	; xmmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05)
+	; xmmF=(15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
+	; xmmB=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F)
+
+	movdqa    xmmG,xmmA
+	pslldq    xmmA,8	; xmmA=(-- -- -- -- -- -- -- -- 00 10 20 01 11 21 02 12)
+	psrldq    xmmG,8	; xmmG=(22 03 13 23 04 14 24 05 -- -- -- -- -- -- -- --)
+
+	punpckhbw xmmA,xmmF	; xmmA=(00 08 10 18 20 28 01 09 11 19 21 29 02 0A 12 1A)
+	pslldq    xmmF,8	; xmmF=(-- -- -- -- -- -- -- -- 15 25 06 16 26 07 17 27)
+
+	punpcklbw xmmG,xmmB	; xmmG=(22 2A 03 0B 13 1B 23 2B 04 0C 14 1C 24 2C 05 0D)
+	punpckhbw xmmF,xmmB	; xmmF=(15 1D 25 2D 06 0E 16 1E 26 2E 07 0F 17 1F 27 2F)
+
+	movdqa    xmmD,xmmA
+	pslldq    xmmA,8	; xmmA=(-- -- -- -- -- -- -- -- 00 08 10 18 20 28 01 09)
+	psrldq    xmmD,8	; xmmD=(11 19 21 29 02 0A 12 1A -- -- -- -- -- -- -- --)
+
+	punpckhbw xmmA,xmmG	; xmmA=(00 04 08 0C 10 14 18 1C 20 24 28 2C 01 05 09 0D)
+	pslldq    xmmG,8	; xmmG=(-- -- -- -- -- -- -- -- 22 2A 03 0B 13 1B 23 2B)
+
+	punpcklbw xmmD,xmmF	; xmmD=(11 15 19 1D 21 25 29 2D 02 06 0A 0E 12 16 1A 1E)
+	punpckhbw xmmG,xmmF	; xmmG=(22 26 2A 2E 03 07 0B 0F 13 17 1B 1F 23 27 2B 2F)
+
+	movdqa    xmmE,xmmA
+	pslldq    xmmA,8	; xmmA=(-- -- -- -- -- -- -- -- 00 04 08 0C 10 14 18 1C)
+	psrldq    xmmE,8	; xmmE=(20 24 28 2C 01 05 09 0D -- -- -- -- -- -- -- --)
+
+	punpckhbw xmmA,xmmD	; xmmA=(00 02 04 06 08 0A 0C 0E 10 12 14 16 18 1A 1C 1E)
+	pslldq    xmmD,8	; xmmD=(-- -- -- -- -- -- -- -- 11 15 19 1D 21 25 29 2D)
+
+	punpcklbw xmmE,xmmG	; xmmE=(20 22 24 26 28 2A 2C 2E 01 03 05 07 09 0B 0D 0F)
+	punpckhbw xmmD,xmmG	; xmmD=(11 13 15 17 19 1B 1D 1F 21 23 25 27 29 2B 2D 2F)
+
+	pxor      xmmH,xmmH
+
+	movdqa    xmmC,xmmA
+	punpcklbw xmmA,xmmH	; xmmA=(00 02 04 06 08 0A 0C 0E)
+	punpckhbw xmmC,xmmH	; xmmC=(10 12 14 16 18 1A 1C 1E)
+
+	movdqa    xmmB,xmmE
+	punpcklbw xmmE,xmmH	; xmmE=(20 22 24 26 28 2A 2C 2E)
+	punpckhbw xmmB,xmmH	; xmmB=(01 03 05 07 09 0B 0D 0F)
+
+	movdqa    xmmF,xmmD
+	punpcklbw xmmD,xmmH	; xmmD=(11 13 15 17 19 1B 1D 1F)
+	punpckhbw xmmF,xmmH	; xmmF=(21 23 25 27 29 2B 2D 2F)
+
+%else ; RGB_PIXELSIZE == 4 ; -----------
+
+.column_ld1:
+	test	cl, SIZEOF_XMMWORD/16
+	jz	short .column_ld2
+	sub	rcx, byte SIZEOF_XMMWORD/16
+	movd	xmmA, XMM_DWORD [rsi+rcx*RGB_PIXELSIZE]
+.column_ld2:
+	test	cl, SIZEOF_XMMWORD/8
+	jz	short .column_ld4
+	sub	rcx, byte SIZEOF_XMMWORD/8
+	movq	xmmE, XMM_MMWORD [rsi+rcx*RGB_PIXELSIZE]
+	pslldq	xmmA, SIZEOF_MMWORD
+	por	xmmA,xmmE
+.column_ld4:
+	test	cl, SIZEOF_XMMWORD/4
+	jz	short .column_ld8
+	sub	rcx, byte SIZEOF_XMMWORD/4
+	movdqa	xmmE,xmmA
+	movdqu	xmmA, XMMWORD [rsi+rcx*RGB_PIXELSIZE]
+.column_ld8:
+	test	cl, SIZEOF_XMMWORD/2
+	mov	rcx, SIZEOF_XMMWORD
+	jz	short .rgb_ycc_cnv
+	movdqa	xmmF,xmmA
+	movdqa	xmmH,xmmE
+	movdqu	xmmA, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqu	xmmE, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+	jmp	short .rgb_ycc_cnv
+
+.columnloop:
+	movdqu	xmmA, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqu	xmmE, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+	movdqu	xmmF, XMMWORD [rsi+2*SIZEOF_XMMWORD]
+	movdqu	xmmH, XMMWORD [rsi+3*SIZEOF_XMMWORD]
+
+.rgb_ycc_cnv:
+	; xmmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33)
+	; xmmE=(04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37)
+	; xmmF=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B)
+	; xmmH=(0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F)
+
+	movdqa    xmmD,xmmA
+	punpcklbw xmmA,xmmE	; xmmA=(00 04 10 14 20 24 30 34 01 05 11 15 21 25 31 35)
+	punpckhbw xmmD,xmmE	; xmmD=(02 06 12 16 22 26 32 36 03 07 13 17 23 27 33 37)
+
+	movdqa    xmmC,xmmF
+	punpcklbw xmmF,xmmH	; xmmF=(08 0C 18 1C 28 2C 38 3C 09 0D 19 1D 29 2D 39 3D)
+	punpckhbw xmmC,xmmH	; xmmC=(0A 0E 1A 1E 2A 2E 3A 3E 0B 0F 1B 1F 2B 2F 3B 3F)
+
+	movdqa    xmmB,xmmA
+	punpcklwd xmmA,xmmF	; xmmA=(00 04 08 0C 10 14 18 1C 20 24 28 2C 30 34 38 3C)
+	punpckhwd xmmB,xmmF	; xmmB=(01 05 09 0D 11 15 19 1D 21 25 29 2D 31 35 39 3D)
+
+	movdqa    xmmG,xmmD
+	punpcklwd xmmD,xmmC	; xmmD=(02 06 0A 0E 12 16 1A 1E 22 26 2A 2E 32 36 3A 3E)
+	punpckhwd xmmG,xmmC	; xmmG=(03 07 0B 0F 13 17 1B 1F 23 27 2B 2F 33 37 3B 3F)
+
+	movdqa    xmmE,xmmA
+	punpcklbw xmmA,xmmD	; xmmA=(00 02 04 06 08 0A 0C 0E 10 12 14 16 18 1A 1C 1E)
+	punpckhbw xmmE,xmmD	; xmmE=(20 22 24 26 28 2A 2C 2E 30 32 34 36 38 3A 3C 3E)
+
+	movdqa    xmmH,xmmB
+	punpcklbw xmmB,xmmG	; xmmB=(01 03 05 07 09 0B 0D 0F 11 13 15 17 19 1B 1D 1F)
+	punpckhbw xmmH,xmmG	; xmmH=(21 23 25 27 29 2B 2D 2F 31 33 35 37 39 3B 3D 3F)
+
+	pxor      xmmF,xmmF
+
+	movdqa    xmmC,xmmA
+	punpcklbw xmmA,xmmF	; xmmA=(00 02 04 06 08 0A 0C 0E)
+	punpckhbw xmmC,xmmF	; xmmC=(10 12 14 16 18 1A 1C 1E)
+
+	movdqa    xmmD,xmmB
+	punpcklbw xmmB,xmmF	; xmmB=(01 03 05 07 09 0B 0D 0F)
+	punpckhbw xmmD,xmmF	; xmmD=(11 13 15 17 19 1B 1D 1F)
+
+	movdqa    xmmG,xmmE
+	punpcklbw xmmE,xmmF	; xmmE=(20 22 24 26 28 2A 2C 2E)
+	punpckhbw xmmG,xmmF	; xmmG=(30 32 34 36 38 3A 3C 3E)
+
+	punpcklbw xmmF,xmmH
+	punpckhbw xmmH,xmmH
+	psrlw     xmmF,BYTE_BIT	; xmmF=(21 23 25 27 29 2B 2D 2F)
+	psrlw     xmmH,BYTE_BIT	; xmmH=(31 33 35 37 39 3B 3D 3F)
+
+%endif ; RGB_PIXELSIZE ; ---------------
+
+	; xmm0=R(02468ACE)=RE, xmm2=G(02468ACE)=GE, xmm4=B(02468ACE)=BE
+	; xmm1=R(13579BDF)=RO, xmm3=G(13579BDF)=GO, xmm5=B(13579BDF)=BO
+
+	; (Original)
+	; Y  =  0.29900 * R + 0.58700 * G + 0.11400 * B
+	; Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
+	; Cr =  0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
+	;
+	; (This implementation)
+	; Y  =  0.29900 * R + 0.33700 * G + 0.11400 * B + 0.25000 * G
+	; Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
+	; Cr =  0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
+
+	movdqa    XMMWORD [wk(0)], xmm0	; wk(0)=RE
+	movdqa    XMMWORD [wk(1)], xmm1	; wk(1)=RO
+	movdqa    XMMWORD [wk(2)], xmm4	; wk(2)=BE
+	movdqa    XMMWORD [wk(3)], xmm5	; wk(3)=BO
+
+	movdqa    xmm6,xmm1
+	punpcklwd xmm1,xmm3
+	punpckhwd xmm6,xmm3
+	movdqa    xmm7,xmm1
+	movdqa    xmm4,xmm6
+	pmaddwd   xmm1,[PW_F0299_F0337] ; xmm1=ROL*FIX(0.299)+GOL*FIX(0.337)
+	pmaddwd   xmm6,[PW_F0299_F0337] ; xmm6=ROH*FIX(0.299)+GOH*FIX(0.337)
+	pmaddwd   xmm7,[PW_MF016_MF033] ; xmm7=ROL*-FIX(0.168)+GOL*-FIX(0.331)
+	pmaddwd   xmm4,[PW_MF016_MF033] ; xmm4=ROH*-FIX(0.168)+GOH*-FIX(0.331)
+
+	movdqa    XMMWORD [wk(4)], xmm1	; wk(4)=ROL*FIX(0.299)+GOL*FIX(0.337)
+	movdqa    XMMWORD [wk(5)], xmm6	; wk(5)=ROH*FIX(0.299)+GOH*FIX(0.337)
+
+	pxor      xmm1,xmm1
+	pxor      xmm6,xmm6
+	punpcklwd xmm1,xmm5		; xmm1=BOL
+	punpckhwd xmm6,xmm5		; xmm6=BOH
+	psrld     xmm1,1		; xmm1=BOL*FIX(0.500)
+	psrld     xmm6,1		; xmm6=BOH*FIX(0.500)
+
+	movdqa    xmm5,[PD_ONEHALFM1_CJ] ; xmm5=[PD_ONEHALFM1_CJ]
+
+	paddd     xmm7,xmm1
+	paddd     xmm4,xmm6
+	paddd     xmm7,xmm5
+	paddd     xmm4,xmm5
+	psrld     xmm7,SCALEBITS	; xmm7=CbOL
+	psrld     xmm4,SCALEBITS	; xmm4=CbOH
+	packssdw  xmm7,xmm4		; xmm7=CbO
+
+	movdqa    xmm1, XMMWORD [wk(2)]	; xmm1=BE
+
+	movdqa    xmm6,xmm0
+	punpcklwd xmm0,xmm2
+	punpckhwd xmm6,xmm2
+	movdqa    xmm5,xmm0
+	movdqa    xmm4,xmm6
+	pmaddwd   xmm0,[PW_F0299_F0337] ; xmm0=REL*FIX(0.299)+GEL*FIX(0.337)
+	pmaddwd   xmm6,[PW_F0299_F0337] ; xmm6=REH*FIX(0.299)+GEH*FIX(0.337)
+	pmaddwd   xmm5,[PW_MF016_MF033] ; xmm5=REL*-FIX(0.168)+GEL*-FIX(0.331)
+	pmaddwd   xmm4,[PW_MF016_MF033] ; xmm4=REH*-FIX(0.168)+GEH*-FIX(0.331)
+
+	movdqa    XMMWORD [wk(6)], xmm0	; wk(6)=REL*FIX(0.299)+GEL*FIX(0.337)
+	movdqa    XMMWORD [wk(7)], xmm6	; wk(7)=REH*FIX(0.299)+GEH*FIX(0.337)
+
+	pxor      xmm0,xmm0
+	pxor      xmm6,xmm6
+	punpcklwd xmm0,xmm1		; xmm0=BEL
+	punpckhwd xmm6,xmm1		; xmm6=BEH
+	psrld     xmm0,1		; xmm0=BEL*FIX(0.500)
+	psrld     xmm6,1		; xmm6=BEH*FIX(0.500)
+
+	movdqa    xmm1,[PD_ONEHALFM1_CJ] ; xmm1=[PD_ONEHALFM1_CJ]
+
+	paddd     xmm5,xmm0
+	paddd     xmm4,xmm6
+	paddd     xmm5,xmm1
+	paddd     xmm4,xmm1
+	psrld     xmm5,SCALEBITS	; xmm5=CbEL
+	psrld     xmm4,SCALEBITS	; xmm4=CbEH
+	packssdw  xmm5,xmm4		; xmm5=CbE
+
+	psllw     xmm7,BYTE_BIT
+	por       xmm5,xmm7		; xmm5=Cb
+	movdqa    XMMWORD [ebx], xmm5	; Save Cb
+
+	movdqa    xmm0, XMMWORD [wk(3)]	; xmm0=BO
+	movdqa    xmm6, XMMWORD [wk(2)]	; xmm6=BE
+	movdqa    xmm1, XMMWORD [wk(1)]	; xmm1=RO
+
+	movdqa    xmm4,xmm0
+	punpcklwd xmm0,xmm3
+	punpckhwd xmm4,xmm3
+	movdqa    xmm7,xmm0
+	movdqa    xmm5,xmm4
+	pmaddwd   xmm0,[PW_F0114_F0250] ; xmm0=BOL*FIX(0.114)+GOL*FIX(0.250)
+	pmaddwd   xmm4,[PW_F0114_F0250] ; xmm4=BOH*FIX(0.114)+GOH*FIX(0.250)
+	pmaddwd   xmm7,[PW_MF008_MF041] ; xmm7=BOL*-FIX(0.081)+GOL*-FIX(0.418)
+	pmaddwd   xmm5,[PW_MF008_MF041] ; xmm5=BOH*-FIX(0.081)+GOH*-FIX(0.418)
+
+	movdqa    xmm3,[PD_ONEHALF]	; xmm3=[PD_ONEHALF]
+
+	paddd     xmm0, XMMWORD [wk(4)]
+	paddd     xmm4, XMMWORD [wk(5)]
+	paddd     xmm0,xmm3
+	paddd     xmm4,xmm3
+	psrld     xmm0,SCALEBITS	; xmm0=YOL
+	psrld     xmm4,SCALEBITS	; xmm4=YOH
+	packssdw  xmm0,xmm4		; xmm0=YO
+
+	pxor      xmm3,xmm3
+	pxor      xmm4,xmm4
+	punpcklwd xmm3,xmm1		; xmm3=ROL
+	punpckhwd xmm4,xmm1		; xmm4=ROH
+	psrld     xmm3,1		; xmm3=ROL*FIX(0.500)
+	psrld     xmm4,1		; xmm4=ROH*FIX(0.500)
+
+	movdqa    xmm1,[PD_ONEHALFM1_CJ] ; xmm1=[PD_ONEHALFM1_CJ]
+
+	paddd     xmm7,xmm3
+	paddd     xmm5,xmm4
+	paddd     xmm7,xmm1
+	paddd     xmm5,xmm1
+	psrld     xmm7,SCALEBITS	; xmm7=CrOL
+	psrld     xmm5,SCALEBITS	; xmm5=CrOH
+	packssdw  xmm7,xmm5		; xmm7=CrO
+
+	movdqa    xmm3, XMMWORD [wk(0)]	; xmm3=RE
+
+	movdqa    xmm4,xmm6
+	punpcklwd xmm6,xmm2
+	punpckhwd xmm4,xmm2
+	movdqa    xmm1,xmm6
+	movdqa    xmm5,xmm4
+	pmaddwd   xmm6,[PW_F0114_F0250] ; xmm6=BEL*FIX(0.114)+GEL*FIX(0.250)
+	pmaddwd   xmm4,[PW_F0114_F0250] ; xmm4=BEH*FIX(0.114)+GEH*FIX(0.250)
+	pmaddwd   xmm1,[PW_MF008_MF041] ; xmm1=BEL*-FIX(0.081)+GEL*-FIX(0.418)
+	pmaddwd   xmm5,[PW_MF008_MF041] ; xmm5=BEH*-FIX(0.081)+GEH*-FIX(0.418)
+
+	movdqa    xmm2,[PD_ONEHALF]	; xmm2=[PD_ONEHALF]
+
+	paddd     xmm6, XMMWORD [wk(6)]
+	paddd     xmm4, XMMWORD [wk(7)]
+	paddd     xmm6,xmm2
+	paddd     xmm4,xmm2
+	psrld     xmm6,SCALEBITS	; xmm6=YEL
+	psrld     xmm4,SCALEBITS	; xmm4=YEH
+	packssdw  xmm6,xmm4		; xmm6=YE
+
+	psllw     xmm0,BYTE_BIT
+	por       xmm6,xmm0		; xmm6=Y
+	movdqa    XMMWORD [rdi], xmm6	; Save Y
+
+	pxor      xmm2,xmm2
+	pxor      xmm4,xmm4
+	punpcklwd xmm2,xmm3		; xmm2=REL
+	punpckhwd xmm4,xmm3		; xmm4=REH
+	psrld     xmm2,1		; xmm2=REL*FIX(0.500)
+	psrld     xmm4,1		; xmm4=REH*FIX(0.500)
+
+	movdqa    xmm0,[PD_ONEHALFM1_CJ] ; xmm0=[PD_ONEHALFM1_CJ]
+
+	paddd     xmm1,xmm2
+	paddd     xmm5,xmm4
+	paddd     xmm1,xmm0
+	paddd     xmm5,xmm0
+	psrld     xmm1,SCALEBITS	; xmm1=CrEL
+	psrld     xmm5,SCALEBITS	; xmm5=CrEH
+	packssdw  xmm1,xmm5		; xmm1=CrE
+
+	psllw     xmm7,BYTE_BIT
+	por       xmm1,xmm7		; xmm1=Cr
+	movdqa    XMMWORD [rdx], xmm1	; Save Cr
+
+	sub	rcx, byte SIZEOF_XMMWORD
+	add	rsi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; inptr
+	add	rdi, byte SIZEOF_XMMWORD		; outptr0
+	add	rbx, byte SIZEOF_XMMWORD		; outptr1
+	add	rdx, byte SIZEOF_XMMWORD		; outptr2
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	near .columnloop
+	test	rcx,rcx
+	jnz	near .column_ld1
+
+	pop	rcx			; col
+	pop	rsi
+	pop	rdi
+	pop	rbx
+	pop	rdx
+
+	add	rsi, byte SIZEOF_JSAMPROW	; input_buf
+	add	rdi, byte SIZEOF_JSAMPROW
+	add	rbx, byte SIZEOF_JSAMPROW
+	add	rdx, byte SIZEOF_JSAMPROW
+	dec	rax				; num_rows
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbx
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
+
diff --git a/simd/jccolss2-64.asm b/simd/jccolss2-64.asm
new file mode 100644
index 0000000..a419d1b
--- /dev/null
+++ b/simd/jccolss2-64.asm
@@ -0,0 +1,117 @@
+;
+; jccolss2.asm - colorspace conversion (64-bit SSE2)
+;
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; Copyright (C) 2009, D. R. Commander.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+
+%define SCALEBITS	16
+
+F_0_081	equ	 5329			; FIX(0.08131)
+F_0_114	equ	 7471			; FIX(0.11400)
+F_0_168	equ	11059			; FIX(0.16874)
+F_0_250	equ	16384			; FIX(0.25000)
+F_0_299	equ	19595			; FIX(0.29900)
+F_0_331	equ	21709			; FIX(0.33126)
+F_0_418	equ	27439			; FIX(0.41869)
+F_0_587	equ	38470			; FIX(0.58700)
+F_0_337	equ	(F_0_587 - F_0_250)	; FIX(0.58700) - FIX(0.25000)
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_rgb_ycc_convert_sse2)
+
+EXTN(jconst_rgb_ycc_convert_sse2):
+
+PW_F0299_F0337	times 4 dw  F_0_299, F_0_337
+PW_F0114_F0250	times 4 dw  F_0_114, F_0_250
+PW_MF016_MF033	times 4 dw -F_0_168,-F_0_331
+PW_MF008_MF041	times 4 dw -F_0_081,-F_0_418
+PD_ONEHALFM1_CJ	times 4 dd  (1 << (SCALEBITS-1)) - 1 + (CENTERJSAMPLE << SCALEBITS)
+PD_ONEHALF	times 4 dd  (1 << (SCALEBITS-1))
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+%include "jcclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 0
+%define RGB_GREEN 1
+%define RGB_BLUE 2
+%define RGB_PIXELSIZE 3
+%define jsimd_rgb_ycc_convert_sse2 jsimd_extrgb_ycc_convert_sse2
+%include "jcclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 0
+%define RGB_GREEN 1
+%define RGB_BLUE 2
+%define RGB_PIXELSIZE 4
+%define jsimd_rgb_ycc_convert_sse2 jsimd_extrgbx_ycc_convert_sse2
+%include "jcclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 2
+%define RGB_GREEN 1
+%define RGB_BLUE 0
+%define RGB_PIXELSIZE 3
+%define jsimd_rgb_ycc_convert_sse2 jsimd_extbgr_ycc_convert_sse2
+%include "jcclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 2
+%define RGB_GREEN 1
+%define RGB_BLUE 0
+%define RGB_PIXELSIZE 4
+%define jsimd_rgb_ycc_convert_sse2 jsimd_extbgrx_ycc_convert_sse2
+%include "jcclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 3
+%define RGB_GREEN 2
+%define RGB_BLUE 1
+%define RGB_PIXELSIZE 4
+%define jsimd_rgb_ycc_convert_sse2 jsimd_extxbgr_ycc_convert_sse2
+%include "jcclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 1
+%define RGB_GREEN 2
+%define RGB_BLUE 3
+%define RGB_PIXELSIZE 4
+%define jsimd_rgb_ycc_convert_sse2 jsimd_extxrgb_ycc_convert_sse2
+%include "jcclrss2-64.asm"
diff --git a/simd/jcqnts2f-64.asm b/simd/jcqnts2f-64.asm
new file mode 100644
index 0000000..51d6307
--- /dev/null
+++ b/simd/jcqnts2f-64.asm
@@ -0,0 +1,152 @@
+;
+; jcqnts2f.asm - sample data conversion and quantization (64-bit SSE & SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Load data into workspace, applying unsigned->signed conversion
+;
+; GLOBAL(void)
+; jsimd_convsamp_float_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
+;                            FAST_FLOAT * workspace);
+;
+
+; r10 = JSAMPARRAY sample_data
+; r11 = JDIMENSION start_col
+; r12 = FAST_FLOAT * workspace
+
+	align	16
+	global	EXTN(jsimd_convsamp_float_sse2)
+
+EXTN(jsimd_convsamp_float_sse2):
+	push	rbp
+	mov	rbp,rsp
+	push	rbx
+	collect_args
+
+	pcmpeqw  xmm7,xmm7
+	psllw    xmm7,7
+	packsswb xmm7,xmm7		; xmm7 = PB_CENTERJSAMPLE (0x808080..)
+
+	mov rsi, r10
+	mov	rax, r11
+	mov rdi, r12
+	mov	rcx, DCTSIZE/2
+.convloop:
+	mov	rbx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+	mov rdx, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+
+	movq	xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]
+	movq	xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]
+
+	psubb	xmm0,xmm7			; xmm0=(01234567)
+	psubb	xmm1,xmm7			; xmm1=(89ABCDEF)
+
+	punpcklbw xmm0,xmm0			; xmm0=(*0*1*2*3*4*5*6*7)
+	punpcklbw xmm1,xmm1			; xmm1=(*8*9*A*B*C*D*E*F)
+
+	punpcklwd xmm2,xmm0			; xmm2=(***0***1***2***3)
+	punpckhwd xmm0,xmm0			; xmm0=(***4***5***6***7)
+	punpcklwd xmm3,xmm1			; xmm3=(***8***9***A***B)
+	punpckhwd xmm1,xmm1			; xmm1=(***C***D***E***F)
+
+	psrad     xmm2,(DWORD_BIT-BYTE_BIT)	; xmm2=(0123)
+	psrad     xmm0,(DWORD_BIT-BYTE_BIT)	; xmm0=(4567)
+	cvtdq2ps  xmm2,xmm2			; xmm2=(0123)
+	cvtdq2ps  xmm0,xmm0			; xmm0=(4567)
+	psrad     xmm3,(DWORD_BIT-BYTE_BIT)	; xmm3=(89AB)
+	psrad     xmm1,(DWORD_BIT-BYTE_BIT)	; xmm1=(CDEF)
+	cvtdq2ps  xmm3,xmm3			; xmm3=(89AB)
+	cvtdq2ps  xmm1,xmm1			; xmm1=(CDEF)
+
+	movaps	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_FAST_FLOAT)], xmm2
+	movaps	XMMWORD [XMMBLOCK(0,1,rdi,SIZEOF_FAST_FLOAT)], xmm0
+	movaps	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_FAST_FLOAT)], xmm3
+	movaps	XMMWORD [XMMBLOCK(1,1,rdi,SIZEOF_FAST_FLOAT)], xmm1
+
+	add	rsi, byte 2*SIZEOF_JSAMPROW
+	add	rdi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT
+	dec	rcx
+	jnz	short .convloop
+
+	uncollect_args
+	pop	rbx
+	pop	rbp
+	ret
+
+
+; --------------------------------------------------------------------------
+;
+; Quantize/descale the coefficients, and store into coef_block
+;
+; GLOBAL(void)
+; jsimd_quantize_float_sse2 (JCOEFPTR coef_block, FAST_FLOAT * divisors,
+;                         FAST_FLOAT * workspace);
+;
+
+; r10 = JCOEFPTR coef_block
+; r11 = FAST_FLOAT * divisors
+; r12 = FAST_FLOAT * workspace
+
+	align	16
+	global	EXTN(jsimd_quantize_float_sse2)
+
+EXTN(jsimd_quantize_float_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov rsi, r12
+	mov rdx, r11
+	mov rdi, r10
+	mov	rax, DCTSIZE2/16
+.quantloop:
+	movaps	xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(0,1,rsi,SIZEOF_FAST_FLOAT)]
+	mulps	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FAST_FLOAT)]
+	mulps	xmm1, XMMWORD [XMMBLOCK(0,1,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm2, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(1,1,rsi,SIZEOF_FAST_FLOAT)]
+	mulps	xmm2, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FAST_FLOAT)]
+	mulps	xmm3, XMMWORD [XMMBLOCK(1,1,rdx,SIZEOF_FAST_FLOAT)]
+
+	cvtps2dq xmm0,xmm0
+	cvtps2dq xmm1,xmm1
+	cvtps2dq xmm2,xmm2
+	cvtps2dq xmm3,xmm3
+
+	packssdw xmm0,xmm1
+	packssdw xmm2,xmm3
+
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_JCOEF)], xmm0
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_JCOEF)], xmm2
+
+	add	rsi, byte 16*SIZEOF_FAST_FLOAT
+	add	rdx, byte 16*SIZEOF_FAST_FLOAT
+	add	rdi, byte 16*SIZEOF_JCOEF
+	dec	rax
+	jnz	short .quantloop
+
+	uncollect_args
+	pop	rbp
+	ret
diff --git a/simd/jcqnts2i-64.asm b/simd/jcqnts2i-64.asm
new file mode 100644
index 0000000..d561590
--- /dev/null
+++ b/simd/jcqnts2i-64.asm
@@ -0,0 +1,181 @@
+;
+; jcqnts2i.asm - sample data conversion and quantization (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Load data into workspace, applying unsigned->signed conversion
+;
+; GLOBAL(void)
+; jsimd_convsamp_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
+;                      DCTELEM * workspace);
+;
+
+; r10 = JSAMPARRAY sample_data
+; r11 = JDIMENSION start_col
+; r12 = DCTELEM * workspace
+
+	align	16
+	global	EXTN(jsimd_convsamp_sse2)
+
+EXTN(jsimd_convsamp_sse2):
+	push	rbp
+	mov	rbp,rsp
+	push	rbx
+	collect_args
+
+	pxor	xmm6,xmm6		; xmm6=(all 0's)
+	pcmpeqw	xmm7,xmm7
+	psllw	xmm7,7			; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
+
+	mov rsi, r10
+	mov rax, r11
+	mov rdi, r12
+	mov	rcx, DCTSIZE/4
+.convloop:
+	mov	rbx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+	mov rdx, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+
+	movq	xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]	; xmm0=(01234567)
+	movq	xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]	; xmm1=(89ABCDEF)
+
+	mov	rbx, JSAMPROW [rsi+2*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+	mov	rdx, JSAMPROW [rsi+3*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+
+	movq	xmm2, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]	; xmm2=(GHIJKLMN)
+	movq	xmm3, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]	; xmm3=(OPQRSTUV)
+
+	punpcklbw xmm0,xmm6		; xmm0=(01234567)
+	punpcklbw xmm1,xmm6		; xmm1=(89ABCDEF)
+	paddw     xmm0,xmm7
+	paddw     xmm1,xmm7
+	punpcklbw xmm2,xmm6		; xmm2=(GHIJKLMN)
+	punpcklbw xmm3,xmm6		; xmm3=(OPQRSTUV)
+	paddw     xmm2,xmm7
+	paddw     xmm3,xmm7
+
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
+	movdqa	XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
+	movdqa	XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
+
+	add	rsi, byte 4*SIZEOF_JSAMPROW
+	add	rdi, byte 4*DCTSIZE*SIZEOF_DCTELEM
+	dec	rcx
+	jnz	short .convloop
+
+	uncollect_args
+	pop	rbx
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Quantize/descale the coefficients, and store into coef_block
+;
+; This implementation is based on an algorithm described in
+;   "How to optimize for the Pentium family of microprocessors"
+;   (http://www.agner.org/assem/).
+;
+; GLOBAL(void)
+; jsimd_quantize_sse2 (JCOEFPTR coef_block, DCTELEM * divisors,
+;                      DCTELEM * workspace);
+;
+
+%define RECIPROCAL(m,n,b) XMMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM)
+%define CORRECTION(m,n,b) XMMBLOCK(DCTSIZE*1+(m),(n),(b),SIZEOF_DCTELEM)
+%define SCALE(m,n,b)      XMMBLOCK(DCTSIZE*2+(m),(n),(b),SIZEOF_DCTELEM)
+
+; r10 = JCOEFPTR coef_block
+; r11 = DCTELEM * divisors
+; r12 = DCTELEM * workspace
+
+	align	16
+	global	EXTN(jsimd_quantize_sse2)
+
+EXTN(jsimd_quantize_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov rsi, r12
+	mov rdx, r11
+	mov rdi, r10
+	mov	rax, DCTSIZE2/32
+.quantloop:
+	movdqa	xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm5, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm6, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm7, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm0,xmm4
+	movdqa	xmm1,xmm5
+	movdqa	xmm2,xmm6
+	movdqa	xmm3,xmm7
+	psraw	xmm4,(WORD_BIT-1)
+	psraw	xmm5,(WORD_BIT-1)
+	psraw	xmm6,(WORD_BIT-1)
+	psraw	xmm7,(WORD_BIT-1)
+	pxor	xmm0,xmm4
+	pxor	xmm1,xmm5
+	pxor	xmm2,xmm6
+	pxor	xmm3,xmm7
+	psubw	xmm0,xmm4		; if (xmm0 < 0) xmm0 = -xmm0;
+	psubw	xmm1,xmm5		; if (xmm1 < 0) xmm1 = -xmm1;
+	psubw	xmm2,xmm6		; if (xmm2 < 0) xmm2 = -xmm2;
+	psubw	xmm3,xmm7		; if (xmm3 < 0) xmm3 = -xmm3;
+
+	paddw	xmm0, XMMWORD [CORRECTION(0,0,rdx)]  ; correction + roundfactor
+	paddw	xmm1, XMMWORD [CORRECTION(1,0,rdx)]
+	paddw	xmm2, XMMWORD [CORRECTION(2,0,rdx)]
+	paddw	xmm3, XMMWORD [CORRECTION(3,0,rdx)]
+	pmulhuw	xmm0, XMMWORD [RECIPROCAL(0,0,rdx)]  ; reciprocal
+	pmulhuw	xmm1, XMMWORD [RECIPROCAL(1,0,rdx)]
+	pmulhuw	xmm2, XMMWORD [RECIPROCAL(2,0,rdx)]
+	pmulhuw	xmm3, XMMWORD [RECIPROCAL(3,0,rdx)]
+	pmulhuw	xmm0, XMMWORD [SCALE(0,0,rdx)]	; scale
+	pmulhuw	xmm1, XMMWORD [SCALE(1,0,rdx)]
+	pmulhuw	xmm2, XMMWORD [SCALE(2,0,rdx)]
+	pmulhuw	xmm3, XMMWORD [SCALE(3,0,rdx)]
+
+	pxor	xmm0,xmm4
+	pxor	xmm1,xmm5
+	pxor	xmm2,xmm6
+	pxor	xmm3,xmm7
+	psubw	xmm0,xmm4
+	psubw	xmm1,xmm5
+	psubw	xmm2,xmm6
+	psubw	xmm3,xmm7
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
+	movdqa	XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
+	movdqa	XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
+
+	add	rsi, byte 32*SIZEOF_DCTELEM
+	add	rdx, byte 32*SIZEOF_DCTELEM
+	add	rdi, byte 32*SIZEOF_JCOEF
+	dec	rax
+	jnz	near .quantloop
+
+	uncollect_args
+	pop	rbp
+	ret
diff --git a/simd/jcsamss2-64.asm b/simd/jcsamss2-64.asm
new file mode 100644
index 0000000..cf7a776
--- /dev/null
+++ b/simd/jcsamss2-64.asm
@@ -0,0 +1,324 @@
+;
+; jcsamss2.asm - downsampling (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Downsample pixel values of a single component.
+; This version handles the common case of 2:1 horizontal and 1:1 vertical,
+; without smoothing.
+;
+; GLOBAL(void)
+; jsimd_h2v1_downsample_sse2 (JDIMENSION image_width, int max_v_samp_factor,
+;                             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+;                             JSAMPARRAY input_data, JSAMPARRAY output_data);
+;
+
+; r10 = JDIMENSION image_width
+; r11 = int max_v_samp_factor
+; r12 = JDIMENSION v_samp_factor
+; r13 = JDIMENSION width_blocks
+; r14 = JSAMPARRAY input_data
+; r15 = JSAMPARRAY output_data
+
+	align	16
+	global	EXTN(jsimd_h2v1_downsample_sse2)
+
+EXTN(jsimd_h2v1_downsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov rcx, r13
+	shl	rcx,3			; imul rcx,DCTSIZE (rcx = output_cols)
+	jz	near .return
+
+	mov rdx, r10
+
+	; -- expand_right_edge
+
+	push	rcx
+	shl	rcx,1				; output_cols * 2
+	sub	rcx,rdx
+	jle	short .expand_end
+
+	mov	rax, r11
+	test	rax,rax
+	jle	short .expand_end
+
+	cld
+	mov	rsi, r14	; input_data
+.expandloop:
+	push	rax
+	push	rcx
+
+	mov	rdi, JSAMPROW [rsi]
+	add	rdi,rdx
+	mov	al, JSAMPLE [rdi-1]
+
+	rep stosb
+
+	pop	rcx
+	pop	rax
+
+	add	rsi, byte SIZEOF_JSAMPROW
+	dec	rax
+	jg	short .expandloop
+
+.expand_end:
+	pop	rcx				; output_cols
+
+	; -- h2v1_downsample
+
+	mov	rax, r12	; rowctr
+	test	eax,eax
+	jle	near .return
+
+	mov	rdx, 0x00010000		; bias pattern
+	movd	xmm7,edx
+	pcmpeqw	xmm6,xmm6
+	pshufd	xmm7,xmm7,0x00		; xmm7={0, 1, 0, 1, 0, 1, 0, 1}
+	psrlw	xmm6,BYTE_BIT		; xmm6={0xFF 0x00 0xFF 0x00 ..}
+
+	mov	rsi, r14	; input_data
+	mov	rdi, r15	; output_data
+.rowloop:
+	push	rcx
+	push	rdi
+	push	rsi
+
+	mov	rsi, JSAMPROW [rsi]		; inptr
+	mov rdi, JSAMPROW [rdi]		; outptr
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	short .columnloop
+
+.columnloop_r8:
+	movdqa	xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	pxor	xmm1,xmm1
+	mov	rcx, SIZEOF_XMMWORD
+	jmp	short .downsample
+
+.columnloop:
+	movdqa	xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqa	xmm1, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+
+.downsample:
+	movdqa	xmm2,xmm0
+	movdqa	xmm3,xmm1
+
+	pand	xmm0,xmm6
+	psrlw	xmm2,BYTE_BIT
+	pand	xmm1,xmm6
+	psrlw	xmm3,BYTE_BIT
+
+	paddw	xmm0,xmm2
+	paddw	xmm1,xmm3
+	paddw	xmm0,xmm7
+	paddw	xmm1,xmm7
+	psrlw	xmm0,1
+	psrlw	xmm1,1
+
+	packuswb xmm0,xmm1
+
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
+
+	sub	rcx, byte SIZEOF_XMMWORD	; outcol
+	add	rsi, byte 2*SIZEOF_XMMWORD	; inptr
+	add	rdi, byte 1*SIZEOF_XMMWORD	; outptr
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	short .columnloop
+	test	rcx,rcx
+	jnz	short .columnloop_r8
+
+	pop	rsi
+	pop	rdi
+	pop	rcx
+
+	add	rsi, byte SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte SIZEOF_JSAMPROW	; output_data
+	dec	rax				; rowctr
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Downsample pixel values of a single component.
+; This version handles the standard case of 2:1 horizontal and 2:1 vertical,
+; without smoothing.
+;
+; GLOBAL(void)
+; jsimd_h2v2_downsample_sse2 (JDIMENSION image_width, int max_v_samp_factor,
+;                             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+;                             JSAMPARRAY input_data, JSAMPARRAY output_data);
+;
+
+; r10 = JDIMENSION image_width
+; r11 = int max_v_samp_factor
+; r12 = JDIMENSION v_samp_factor
+; r13 = JDIMENSION width_blocks
+; r14 = JSAMPARRAY input_data
+; r15 = JSAMPARRAY output_data
+
+	align	16
+	global	EXTN(jsimd_h2v2_downsample_sse2)
+
+EXTN(jsimd_h2v2_downsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov	rcx, r13
+	shl	rcx,3			; imul rcx,DCTSIZE (rcx = output_cols)
+	jz	near .return
+
+	mov	rdx, r10
+
+	; -- expand_right_edge
+
+	push	rcx
+	shl	rcx,1				; output_cols * 2
+	sub	rcx,rdx
+	jle	short .expand_end
+
+	mov	rax, r11
+	test	rax,rax
+	jle	short .expand_end
+
+	cld
+	mov	rsi, r14	; input_data
+.expandloop:
+	push	rax
+	push	rcx
+
+	mov	rdi, JSAMPROW [rsi]
+	add	rdi,rdx
+	mov	al, JSAMPLE [rdi-1]
+
+	rep stosb
+
+	pop	rcx
+	pop	rax
+
+	add	rsi, byte SIZEOF_JSAMPROW
+	dec	rax
+	jg	short .expandloop
+
+.expand_end:
+	pop	rcx				; output_cols
+
+	; -- h2v2_downsample
+
+	mov	rax, r12	; rowctr
+	test	rax,rax
+	jle	near .return
+
+	mov	rdx, 0x00020001		; bias pattern
+	movd	xmm7,edx
+	pcmpeqw	xmm6,xmm6
+	pshufd	xmm7,xmm7,0x00		; xmm7={1, 2, 1, 2, 1, 2, 1, 2}
+	psrlw	xmm6,BYTE_BIT		; xmm6={0xFF 0x00 0xFF 0x00 ..}
+
+	mov	rsi, r14	; input_data
+	mov	rdi, r15	; output_data
+.rowloop:
+	push	rcx
+	push	rdi
+	push	rsi
+
+	mov	rdx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]	; inptr0
+	mov	rsi, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]	; inptr1
+	mov	rdi, JSAMPROW [rdi]			; outptr
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	short .columnloop
+
+.columnloop_r8:
+	movdqa	xmm0, XMMWORD [rdx+0*SIZEOF_XMMWORD]
+	movdqa	xmm1, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	pxor	xmm2,xmm2
+	pxor	xmm3,xmm3
+	mov	rcx, SIZEOF_XMMWORD
+	jmp	short .downsample
+
+.columnloop:
+	movdqa	xmm0, XMMWORD [rdx+0*SIZEOF_XMMWORD]
+	movdqa	xmm1, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqa	xmm2, XMMWORD [rdx+1*SIZEOF_XMMWORD]
+	movdqa	xmm3, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+
+.downsample:
+	movdqa	xmm4,xmm0
+	movdqa	xmm5,xmm1
+	pand	xmm0,xmm6
+	psrlw	xmm4,BYTE_BIT
+	pand	xmm1,xmm6
+	psrlw	xmm5,BYTE_BIT
+	paddw	xmm0,xmm4
+	paddw	xmm1,xmm5
+
+	movdqa	xmm4,xmm2
+	movdqa	xmm5,xmm3
+	pand	xmm2,xmm6
+	psrlw	xmm4,BYTE_BIT
+	pand	xmm3,xmm6
+	psrlw	xmm5,BYTE_BIT
+	paddw	xmm2,xmm4
+	paddw	xmm3,xmm5
+
+	paddw	xmm0,xmm1
+	paddw	xmm2,xmm3
+	paddw	xmm0,xmm7
+	paddw	xmm2,xmm7
+	psrlw	xmm0,2
+	psrlw	xmm2,2
+
+	packuswb xmm0,xmm2
+
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
+
+	sub	rcx, byte SIZEOF_XMMWORD	; outcol
+	add	rdx, byte 2*SIZEOF_XMMWORD	; inptr0
+	add	rsi, byte 2*SIZEOF_XMMWORD	; inptr1
+	add	rdi, byte 1*SIZEOF_XMMWORD	; outptr
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	near .columnloop
+	test	rcx,rcx
+	jnz	near .columnloop_r8
+
+	pop	rsi
+	pop	rdi
+	pop	rcx
+
+	add	rsi, byte 2*SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte 1*SIZEOF_JSAMPROW	; output_data
+	dec	rax				; rowctr
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbp
+	ret
diff --git a/simd/jdclrss2-64.asm b/simd/jdclrss2-64.asm
new file mode 100644
index 0000000..0808eca
--- /dev/null
+++ b/simd/jdclrss2-64.asm
@@ -0,0 +1,483 @@
+;
+; jdclrss2.asm - colorspace conversion (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jcolsamp.inc"
+				
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Convert some rows of samples to the output colorspace.
+;
+; GLOBAL(void)
+; jsimd_ycc_rgb_convert_sse2 (JDIMENSION out_width,
+;                             JSAMPIMAGE input_buf, JDIMENSION input_row,
+;                             JSAMPARRAY output_buf, int num_rows)
+;
+
+; r10 = JDIMENSION out_width
+; r11 = JSAMPIMAGE input_buf
+; r12 = JDIMENSION input_row
+; r13 = JSAMPARRAY output_buf
+; r14 = int num_rows
+
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		2
+
+	align	16
+	global	EXTN(jsimd_ycc_rgb_convert_sse2)
+
+EXTN(jsimd_ycc_rgb_convert_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	push	rbx
+	collect_args
+
+	mov	rcx, r10	; num_cols
+	test	rcx,rcx
+	jz	near .return
+
+	push	rcx
+
+	mov	rdi, r11
+	mov	rcx, r12
+	mov	rsi, JSAMPARRAY [rdi+0*SIZEOF_JSAMPARRAY]
+	mov	rbx, JSAMPARRAY [rdi+1*SIZEOF_JSAMPARRAY]
+	mov	rdx, JSAMPARRAY [rdi+2*SIZEOF_JSAMPARRAY]
+	lea	rsi, [rsi+rcx*SIZEOF_JSAMPROW]
+	lea	rbx, [rbx+rcx*SIZEOF_JSAMPROW]
+	lea	rdx, [rdx+rcx*SIZEOF_JSAMPROW]
+
+	pop	rcx
+
+	mov	rdi, r13
+	mov	rax, r14
+	test	rax,rax
+	jle	near .return
+.rowloop:
+	push	rax
+	push	rdi
+	push	rdx
+	push	rbx
+	push	rsi
+	push	rcx			; col
+
+	mov	rsi, JSAMPROW [rsi]	; inptr0
+	mov	rbx, JSAMPROW [rbx]	; inptr1
+	mov	rdx, JSAMPROW [rdx]	; inptr2
+	mov	rdi, JSAMPROW [rdi]	; outptr
+.columnloop:
+
+	movdqa	xmm5, XMMWORD [rbx]	; xmm5=Cb(0123456789ABCDEF)
+	movdqa	xmm1, XMMWORD [rdx]	; xmm1=Cr(0123456789ABCDEF)
+
+	pcmpeqw	xmm4,xmm4
+	pcmpeqw	xmm7,xmm7
+	psrlw	xmm4,BYTE_BIT
+	psllw	xmm7,7			; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
+	movdqa	xmm0,xmm4		; xmm0=xmm4={0xFF 0x00 0xFF 0x00 ..}
+
+	pand	xmm4,xmm5		; xmm4=Cb(02468ACE)=CbE
+	psrlw	xmm5,BYTE_BIT		; xmm5=Cb(13579BDF)=CbO
+	pand	xmm0,xmm1		; xmm0=Cr(02468ACE)=CrE
+	psrlw	xmm1,BYTE_BIT		; xmm1=Cr(13579BDF)=CrO
+
+	paddw	xmm4,xmm7
+	paddw	xmm5,xmm7
+	paddw	xmm0,xmm7
+	paddw	xmm1,xmm7
+
+	; (Original)
+	; R = Y                + 1.40200 * Cr
+	; G = Y - 0.34414 * Cb - 0.71414 * Cr
+	; B = Y + 1.77200 * Cb
+	;
+	; (This implementation)
+	; R = Y                + 0.40200 * Cr + Cr
+	; G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
+	; B = Y - 0.22800 * Cb + Cb + Cb
+
+	movdqa	xmm2,xmm4		; xmm2=CbE
+	movdqa	xmm3,xmm5		; xmm3=CbO
+	paddw	xmm4,xmm4		; xmm4=2*CbE
+	paddw	xmm5,xmm5		; xmm5=2*CbO
+	movdqa	xmm6,xmm0		; xmm6=CrE
+	movdqa	xmm7,xmm1		; xmm7=CrO
+	paddw	xmm0,xmm0		; xmm0=2*CrE
+	paddw	xmm1,xmm1		; xmm1=2*CrO
+
+	pmulhw	xmm4,[PW_MF0228]	; xmm4=(2*CbE * -FIX(0.22800))
+	pmulhw	xmm5,[PW_MF0228]	; xmm5=(2*CbO * -FIX(0.22800))
+	pmulhw	xmm0,[PW_F0402]	; xmm0=(2*CrE * FIX(0.40200))
+	pmulhw	xmm1,[PW_F0402]	; xmm1=(2*CrO * FIX(0.40200))
+
+	paddw	xmm4,[PW_ONE]
+	paddw	xmm5,[PW_ONE]
+	psraw	xmm4,1			; xmm4=(CbE * -FIX(0.22800))
+	psraw	xmm5,1			; xmm5=(CbO * -FIX(0.22800))
+	paddw	xmm0,[PW_ONE]
+	paddw	xmm1,[PW_ONE]
+	psraw	xmm0,1			; xmm0=(CrE * FIX(0.40200))
+	psraw	xmm1,1			; xmm1=(CrO * FIX(0.40200))
+
+	paddw	xmm4,xmm2
+	paddw	xmm5,xmm3
+	paddw	xmm4,xmm2		; xmm4=(CbE * FIX(1.77200))=(B-Y)E
+	paddw	xmm5,xmm3		; xmm5=(CbO * FIX(1.77200))=(B-Y)O
+	paddw	xmm0,xmm6		; xmm0=(CrE * FIX(1.40200))=(R-Y)E
+	paddw	xmm1,xmm7		; xmm1=(CrO * FIX(1.40200))=(R-Y)O
+
+	movdqa	XMMWORD [wk(0)], xmm4	; wk(0)=(B-Y)E
+	movdqa	XMMWORD [wk(1)], xmm5	; wk(1)=(B-Y)O
+
+	movdqa    xmm4,xmm2
+	movdqa    xmm5,xmm3
+	punpcklwd xmm2,xmm6
+	punpckhwd xmm4,xmm6
+	pmaddwd   xmm2,[PW_MF0344_F0285]
+	pmaddwd   xmm4,[PW_MF0344_F0285]
+	punpcklwd xmm3,xmm7
+	punpckhwd xmm5,xmm7
+	pmaddwd   xmm3,[PW_MF0344_F0285]
+	pmaddwd   xmm5,[PW_MF0344_F0285]
+
+	paddd     xmm2,[PD_ONEHALF]
+	paddd     xmm4,[PD_ONEHALF]
+	psrad     xmm2,SCALEBITS
+	psrad     xmm4,SCALEBITS
+	paddd     xmm3,[PD_ONEHALF]
+	paddd     xmm5,[PD_ONEHALF]
+	psrad     xmm3,SCALEBITS
+	psrad     xmm5,SCALEBITS
+
+	packssdw  xmm2,xmm4	; xmm2=CbE*-FIX(0.344)+CrE*FIX(0.285)
+	packssdw  xmm3,xmm5	; xmm3=CbO*-FIX(0.344)+CrO*FIX(0.285)
+	psubw     xmm2,xmm6	; xmm2=CbE*-FIX(0.344)+CrE*-FIX(0.714)=(G-Y)E
+	psubw     xmm3,xmm7	; xmm3=CbO*-FIX(0.344)+CrO*-FIX(0.714)=(G-Y)O
+
+	movdqa    xmm5, XMMWORD [rsi]	; xmm5=Y(0123456789ABCDEF)
+
+	pcmpeqw   xmm4,xmm4
+	psrlw     xmm4,BYTE_BIT		; xmm4={0xFF 0x00 0xFF 0x00 ..}
+	pand      xmm4,xmm5		; xmm4=Y(02468ACE)=YE
+	psrlw     xmm5,BYTE_BIT		; xmm5=Y(13579BDF)=YO
+
+	paddw     xmm0,xmm4		; xmm0=((R-Y)E+YE)=RE=R(02468ACE)
+	paddw     xmm1,xmm5		; xmm1=((R-Y)O+YO)=RO=R(13579BDF)
+	packuswb  xmm0,xmm0		; xmm0=R(02468ACE********)
+	packuswb  xmm1,xmm1		; xmm1=R(13579BDF********)
+
+	paddw     xmm2,xmm4		; xmm2=((G-Y)E+YE)=GE=G(02468ACE)
+	paddw     xmm3,xmm5		; xmm3=((G-Y)O+YO)=GO=G(13579BDF)
+	packuswb  xmm2,xmm2		; xmm2=G(02468ACE********)
+	packuswb  xmm3,xmm3		; xmm3=G(13579BDF********)
+
+	paddw     xmm4, XMMWORD [wk(0)]	; xmm4=(YE+(B-Y)E)=BE=B(02468ACE)
+	paddw     xmm5, XMMWORD [wk(1)]	; xmm5=(YO+(B-Y)O)=BO=B(13579BDF)
+	packuswb  xmm4,xmm4		; xmm4=B(02468ACE********)
+	packuswb  xmm5,xmm5		; xmm5=B(13579BDF********)
+
+%if RGB_PIXELSIZE == 3 ; ---------------
+
+	; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
+	; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
+	; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
+	; xmmG=(** ** ** ** ** ** ** ** **), xmmH=(** ** ** ** ** ** ** ** **)
+
+	punpcklbw xmmA,xmmC	; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
+	punpcklbw xmmE,xmmB	; xmmE=(20 01 22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F)
+	punpcklbw xmmD,xmmF	; xmmD=(11 21 13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F)
+
+	movdqa    xmmG,xmmA
+	movdqa    xmmH,xmmA
+	punpcklwd xmmA,xmmE	; xmmA=(00 10 20 01 02 12 22 03 04 14 24 05 06 16 26 07)
+	punpckhwd xmmG,xmmE	; xmmG=(08 18 28 09 0A 1A 2A 0B 0C 1C 2C 0D 0E 1E 2E 0F)
+
+	psrldq    xmmH,2	; xmmH=(02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E -- --)
+	psrldq    xmmE,2	; xmmE=(22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F -- --)
+
+	movdqa    xmmC,xmmD
+	movdqa    xmmB,xmmD
+	punpcklwd xmmD,xmmH	; xmmD=(11 21 02 12 13 23 04 14 15 25 06 16 17 27 08 18)
+	punpckhwd xmmC,xmmH	; xmmC=(19 29 0A 1A 1B 2B 0C 1C 1D 2D 0E 1E 1F 2F -- --)
+
+	psrldq    xmmB,2	; xmmB=(13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F -- --)
+
+	movdqa    xmmF,xmmE
+	punpcklwd xmmE,xmmB	; xmmE=(22 03 13 23 24 05 15 25 26 07 17 27 28 09 19 29)
+	punpckhwd xmmF,xmmB	; xmmF=(2A 0B 1B 2B 2C 0D 1D 2D 2E 0F 1F 2F -- -- -- --)
+
+	pshufd    xmmH,xmmA,0x4E; xmmH=(04 14 24 05 06 16 26 07 00 10 20 01 02 12 22 03)
+	movdqa    xmmB,xmmE
+	punpckldq xmmA,xmmD	; xmmA=(00 10 20 01 11 21 02 12 02 12 22 03 13 23 04 14)
+	punpckldq xmmE,xmmH	; xmmE=(22 03 13 23 04 14 24 05 24 05 15 25 06 16 26 07)
+	punpckhdq xmmD,xmmB	; xmmD=(15 25 06 16 26 07 17 27 17 27 08 18 28 09 19 29)
+
+	pshufd    xmmH,xmmG,0x4E; xmmH=(0C 1C 2C 0D 0E 1E 2E 0F 08 18 28 09 0A 1A 2A 0B)
+	movdqa    xmmB,xmmF
+	punpckldq xmmG,xmmC	; xmmG=(08 18 28 09 19 29 0A 1A 0A 1A 2A 0B 1B 2B 0C 1C)
+	punpckldq xmmF,xmmH	; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 2C 0D 1D 2D 0E 1E 2E 0F)
+	punpckhdq xmmC,xmmB	; xmmC=(1D 2D 0E 1E 2E 0F 1F 2F 1F 2F -- -- -- -- -- --)
+
+	punpcklqdq xmmA,xmmE	; xmmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05)
+	punpcklqdq xmmD,xmmG	; xmmD=(15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
+	punpcklqdq xmmF,xmmC	; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F)
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jb	short .column_st32
+
+	test	rdi, SIZEOF_XMMWORD-1
+	jnz	short .out1
+	; --(aligned)-------------------
+	movntdq	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
+	movntdq	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
+	movntdq	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmF
+	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
+	jmp	short .out0
+.out1:	; --(unaligned)-----------------
+	pcmpeqb    xmmH,xmmH			; xmmH=(all 1's)
+	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmH			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmF,xmmH			; movntdqu XMMWORD [rdi], xmmF
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+.out0:
+	sub	rcx, byte SIZEOF_XMMWORD
+	jz	near .nextrow
+
+	add	rsi, byte SIZEOF_XMMWORD	; inptr0
+	add	rbx, byte SIZEOF_XMMWORD	; inptr1
+	add	rdx, byte SIZEOF_XMMWORD	; inptr2
+	jmp	near .columnloop
+
+.column_st32:
+	pcmpeqb	xmmH,xmmH			; xmmH=(all 1's)
+	lea	rcx, [rcx+rcx*2]		; imul ecx, RGB_PIXELSIZE
+	cmp	rcx, byte 2*SIZEOF_XMMWORD
+	jb	short .column_st16
+	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmH			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmF
+	sub	rcx, byte 2*SIZEOF_XMMWORD
+	jmp	short .column_st15
+.column_st16:
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jb	short .column_st15
+	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmD
+	sub	rcx, byte SIZEOF_XMMWORD
+.column_st15:
+	mov	rax,rcx
+	xor	rcx, byte 0x0F
+	shl	rcx, 2
+	movd	xmmB,ecx
+	psrlq	xmmH,4
+	pcmpeqb	xmmE,xmmE
+	psrlq	xmmH,xmmB
+	psrlq	xmmE,xmmB
+	punpcklbw xmmE,xmmH
+	; ----------------
+	mov	rcx,rdi
+	and	rcx, byte SIZEOF_XMMWORD-1
+	jz	short .adj0
+	add	rax,rcx
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	short .adj0
+	and	rdi, byte (-SIZEOF_XMMWORD)	; align to 16-byte boundary
+	shl	rcx, 3			; pslldq xmmA,ecx & pslldq xmmE,rcx
+	movdqa	xmmG,xmmA
+	movdqa	xmmC,xmmE
+	pslldq	xmmA, SIZEOF_XMMWORD/2
+	pslldq	xmmE, SIZEOF_XMMWORD/2
+	movd	xmmD,ecx
+	sub	rcx, byte (SIZEOF_XMMWORD/2)*BYTE_BIT
+	jb	short .adj1
+	movd	xmmF,ecx
+	psllq	xmmA,xmmF
+	psllq	xmmE,xmmF
+	jmp	short .adj0
+.adj1:	neg	ecx
+	movd	xmmF,ecx
+	psrlq	xmmA,xmmF
+	psrlq	xmmE,xmmF
+	psllq	xmmG,xmmD
+	psllq	xmmC,xmmD
+	por	xmmA,xmmG
+	por	xmmE,xmmC
+.adj0:	; ----------------
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
+
+%else ; RGB_PIXELSIZE == 4 ; -----------
+
+%ifdef RGBX_FILLER_0XFF
+	pcmpeqb   xmm6,xmm6		; xmm6=XE=X(02468ACE********)
+	pcmpeqb   xmm7,xmm7		; xmm7=XO=X(13579BDF********)
+%else
+	pxor      xmm6,xmm6		; xmm6=XE=X(02468ACE********)
+	pxor      xmm7,xmm7		; xmm7=XO=X(13579BDF********)
+%endif
+	; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
+	; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
+	; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
+	; xmmG=(30 32 34 36 38 3A 3C 3E **), xmmH=(31 33 35 37 39 3B 3D 3F **)
+
+	punpcklbw xmmA,xmmC	; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
+	punpcklbw xmmE,xmmG	; xmmE=(20 30 22 32 24 34 26 36 28 38 2A 3A 2C 3C 2E 3E)
+	punpcklbw xmmB,xmmD	; xmmB=(01 11 03 13 05 15 07 17 09 19 0B 1B 0D 1D 0F 1F)
+	punpcklbw xmmF,xmmH	; xmmF=(21 31 23 33 25 35 27 37 29 39 2B 3B 2D 3D 2F 3F)
+
+	movdqa    xmmC,xmmA
+	punpcklwd xmmA,xmmE	; xmmA=(00 10 20 30 02 12 22 32 04 14 24 34 06 16 26 36)
+	punpckhwd xmmC,xmmE	; xmmC=(08 18 28 38 0A 1A 2A 3A 0C 1C 2C 3C 0E 1E 2E 3E)
+	movdqa    xmmG,xmmB
+	punpcklwd xmmB,xmmF	; xmmB=(01 11 21 31 03 13 23 33 05 15 25 35 07 17 27 37)
+	punpckhwd xmmG,xmmF	; xmmG=(09 19 29 39 0B 1B 2B 3B 0D 1D 2D 3D 0F 1F 2F 3F)
+
+	movdqa    xmmD,xmmA
+	punpckldq xmmA,xmmB	; xmmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33)
+	punpckhdq xmmD,xmmB	; xmmD=(04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37)
+	movdqa    xmmH,xmmC
+	punpckldq xmmC,xmmG	; xmmC=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B)
+	punpckhdq xmmH,xmmG	; xmmH=(0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F)
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jb	short .column_st32
+
+	test	rdi, SIZEOF_XMMWORD-1
+	jnz	short .out1
+	; --(aligned)-------------------
+	movntdq	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
+	movntdq	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
+	movntdq	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmC
+	movntdq	XMMWORD [rdi+3*SIZEOF_XMMWORD], xmmH
+	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
+	jmp	short .out0
+.out1:	; --(unaligned)-----------------
+	pcmpeqb    xmmE,xmmE			; xmmE=(all 1's)
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmE			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmC,xmmE			; movntdqu XMMWORD [rdi], xmmC
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmH,xmmE			; movntdqu XMMWORD [rdi], xmmH
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+.out0:
+	sub	rcx, byte SIZEOF_XMMWORD
+	jz	near .nextrow
+
+	add	rsi, byte SIZEOF_XMMWORD	; inptr0
+	add	rbx, byte SIZEOF_XMMWORD	; inptr1
+	add	rdx, byte SIZEOF_XMMWORD	; inptr2
+	jmp	near .columnloop
+
+.column_st32:
+	pcmpeqb	xmmE,xmmE			; xmmE=(all 1's)
+	cmp	rcx, byte SIZEOF_XMMWORD/2
+	jb	short .column_st16
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmE			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmC
+	movdqa	xmmD,xmmH
+	sub	rcx, byte SIZEOF_XMMWORD/2
+.column_st16:
+	cmp	rcx, byte SIZEOF_XMMWORD/4
+	jb	short .column_st15
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmD
+	sub	rcx, byte SIZEOF_XMMWORD/4
+.column_st15:
+	cmp	rcx, byte SIZEOF_XMMWORD/16
+	jb	near .nextrow
+	mov	rax,rcx
+	xor	rcx, byte 0x03
+	inc	rcx
+	shl	rcx, 4
+	movd	xmmF,ecx
+	psrlq	xmmE,xmmF
+	punpcklbw xmmE,xmmE
+	; ----------------
+	mov	rcx,rdi
+	and	rcx, byte SIZEOF_XMMWORD-1
+	jz	short .adj0
+	lea	rax, [rcx+rax*4]	; RGB_PIXELSIZE
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	short .adj0
+	and	rdi, byte (-SIZEOF_XMMWORD)	; align to 16-byte boundary
+	shl	rcx, 3			; pslldq xmmA,ecx & pslldq xmmE,ecx
+	movdqa	xmmB,xmmA
+	movdqa	xmmG,xmmE
+	pslldq	xmmA, SIZEOF_XMMWORD/2
+	pslldq	xmmE, SIZEOF_XMMWORD/2
+	movd	xmmC,ecx
+	sub	rcx, byte (SIZEOF_XMMWORD/2)*BYTE_BIT
+	jb	short .adj1
+	movd	xmmH,ecx
+	psllq	xmmA,xmmH
+	psllq	xmmE,xmmH
+	jmp	short .adj0
+.adj1:	neg	rcx
+	movd	xmmH,ecx
+	psrlq	xmmA,xmmH
+	psrlq	xmmE,xmmH
+	psllq	xmmB,xmmC
+	psllq	xmmG,xmmC
+	por	xmmA,xmmB
+	por	xmmE,xmmG
+.adj0:	; ----------------
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
+
+%endif ; RGB_PIXELSIZE ; ---------------
+
+.nextrow:
+	pop	rcx
+	pop	rsi
+	pop	rbx
+	pop	rdx
+	pop	rdi
+	pop	rax
+
+	add	rsi, byte SIZEOF_JSAMPROW
+	add	rbx, byte SIZEOF_JSAMPROW
+	add	rdx, byte SIZEOF_JSAMPROW
+	add	rdi, byte SIZEOF_JSAMPROW	; output_buf
+	dec	rax				; num_rows
+	jg	near .rowloop
+
+	sfence		; flush the write buffer
+
+.return:
+	uncollect_args
+	pop	rbx
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
diff --git a/simd/jdcolss2-64.asm b/simd/jdcolss2-64.asm
new file mode 100644
index 0000000..5e8a322
--- /dev/null
+++ b/simd/jdcolss2-64.asm
@@ -0,0 +1,117 @@
+;
+; jdcolss2.asm - colorspace conversion (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+
+%define SCALEBITS	16
+
+F_0_344	equ	 22554			; FIX(0.34414)
+F_0_714	equ	 46802			; FIX(0.71414)
+F_1_402	equ	 91881			; FIX(1.40200)
+F_1_772	equ	116130			; FIX(1.77200)
+F_0_402	equ	(F_1_402 - 65536)	; FIX(1.40200) - FIX(1)
+F_0_285	equ	( 65536 - F_0_714)	; FIX(1) - FIX(0.71414)
+F_0_228	equ	(131072 - F_1_772)	; FIX(2) - FIX(1.77200)
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_ycc_rgb_convert_sse2)
+
+EXTN(jconst_ycc_rgb_convert_sse2):
+
+PW_F0402	times 8 dw  F_0_402
+PW_MF0228	times 8 dw -F_0_228
+PW_MF0344_F0285	times 4 dw -F_0_344, F_0_285
+PW_ONE		times 8 dw  1
+PD_ONEHALF	times 4 dd  1 << (SCALEBITS-1)
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+%include "jdclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 0
+%define RGB_GREEN 1
+%define RGB_BLUE 2
+%define RGB_PIXELSIZE 3
+%define jsimd_ycc_rgb_convert_sse2 jsimd_ycc_extrgb_convert_sse2
+%include "jdclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 0
+%define RGB_GREEN 1
+%define RGB_BLUE 2
+%define RGB_PIXELSIZE 4
+%define jsimd_ycc_rgb_convert_sse2 jsimd_ycc_extrgbx_convert_sse2
+%include "jdclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 2
+%define RGB_GREEN 1
+%define RGB_BLUE 0
+%define RGB_PIXELSIZE 3
+%define jsimd_ycc_rgb_convert_sse2 jsimd_ycc_extbgr_convert_sse2
+%include "jdclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 2
+%define RGB_GREEN 1
+%define RGB_BLUE 0
+%define RGB_PIXELSIZE 4
+%define jsimd_ycc_rgb_convert_sse2 jsimd_ycc_extbgrx_convert_sse2
+%include "jdclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 3
+%define RGB_GREEN 2
+%define RGB_BLUE 1
+%define RGB_PIXELSIZE 4
+%define jsimd_ycc_rgb_convert_sse2 jsimd_ycc_extxbgr_convert_sse2
+%include "jdclrss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 1
+%define RGB_GREEN 2
+%define RGB_BLUE 3
+%define RGB_PIXELSIZE 4
+%define jsimd_ycc_rgb_convert_sse2 jsimd_ycc_extxrgb_convert_sse2
+%include "jdclrss2-64.asm"
diff --git a/simd/jdmerss2-64.asm b/simd/jdmerss2-64.asm
new file mode 100644
index 0000000..2f9c5c1
--- /dev/null
+++ b/simd/jdmerss2-64.asm
@@ -0,0 +1,123 @@
+;
+; jdmerss2.asm - merged upsampling/color conversion (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+
+%define SCALEBITS	16
+
+F_0_344	equ	 22554			; FIX(0.34414)
+F_0_714	equ	 46802			; FIX(0.71414)
+F_1_402	equ	 91881			; FIX(1.40200)
+F_1_772	equ	116130			; FIX(1.77200)
+F_0_402	equ	(F_1_402 - 65536)	; FIX(1.40200) - FIX(1)
+F_0_285	equ	( 65536 - F_0_714)	; FIX(1) - FIX(0.71414)
+F_0_228	equ	(131072 - F_1_772)	; FIX(2) - FIX(1.77200)
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_merged_upsample_sse2)
+
+EXTN(jconst_merged_upsample_sse2):
+
+PW_F0402	times 8 dw  F_0_402
+PW_MF0228	times 8 dw -F_0_228
+PW_MF0344_F0285	times 4 dw -F_0_344, F_0_285
+PW_ONE		times 8 dw  1
+PD_ONEHALF	times 4 dd  1 << (SCALEBITS-1)
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+%include "jdmrgss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 0
+%define RGB_GREEN 1
+%define RGB_BLUE 2
+%define RGB_PIXELSIZE 3
+%define jsimd_h2v1_merged_upsample_sse2 jsimd_h2v1_extrgb_merged_upsample_sse2
+%define jsimd_h2v2_merged_upsample_sse2 jsimd_h2v2_extrgb_merged_upsample_sse2
+%include "jdmrgss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 0
+%define RGB_GREEN 1
+%define RGB_BLUE 2
+%define RGB_PIXELSIZE 4
+%define jsimd_h2v1_merged_upsample_sse2 jsimd_h2v1_extrgbx_merged_upsample_sse2
+%define jsimd_h2v2_merged_upsample_sse2 jsimd_h2v2_extrgbx_merged_upsample_sse2
+%include "jdmrgss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 2
+%define RGB_GREEN 1
+%define RGB_BLUE 0
+%define RGB_PIXELSIZE 3
+%define jsimd_h2v1_merged_upsample_sse2 jsimd_h2v1_extbgr_merged_upsample_sse2
+%define jsimd_h2v2_merged_upsample_sse2 jsimd_h2v2_extbgr_merged_upsample_sse2
+%include "jdmrgss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 2
+%define RGB_GREEN 1
+%define RGB_BLUE 0
+%define RGB_PIXELSIZE 4
+%define jsimd_h2v1_merged_upsample_sse2 jsimd_h2v1_extbgrx_merged_upsample_sse2
+%define jsimd_h2v2_merged_upsample_sse2 jsimd_h2v2_extbgrx_merged_upsample_sse2
+%include "jdmrgss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 3
+%define RGB_GREEN 2
+%define RGB_BLUE 1
+%define RGB_PIXELSIZE 4
+%define jsimd_h2v1_merged_upsample_sse2 jsimd_h2v1_extxbgr_merged_upsample_sse2
+%define jsimd_h2v2_merged_upsample_sse2 jsimd_h2v2_extxbgr_merged_upsample_sse2
+%include "jdmrgss2-64.asm"
+
+%undef RGB_RED
+%undef RGB_GREEN
+%undef RGB_BLUE
+%undef RGB_PIXELSIZE
+%define RGB_RED 1
+%define RGB_GREEN 2
+%define RGB_BLUE 3
+%define RGB_PIXELSIZE 4
+%define jsimd_h2v1_merged_upsample_sse2 jsimd_h2v1_extxrgb_merged_upsample_sse2
+%define jsimd_h2v2_merged_upsample_sse2 jsimd_h2v2_extxrgb_merged_upsample_sse2
+%include "jdmrgss2-64.asm"
diff --git a/simd/jdmrgss2-64.asm b/simd/jdmrgss2-64.asm
new file mode 100644
index 0000000..6474f43
--- /dev/null
+++ b/simd/jdmrgss2-64.asm
@@ -0,0 +1,565 @@
+;
+; jdmrgss2.asm - merged upsampling/color conversion (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jcolsamp.inc"
+				
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
+;
+; GLOBAL(void)
+; jsimd_h2v1_merged_upsample_sse2 (JDIMENSION output_width,
+;                                  JSAMPIMAGE input_buf,
+;                                  JDIMENSION in_row_group_ctr,
+;                                  JSAMPARRAY output_buf);
+;
+
+; r10 = JDIMENSION output_width
+; r11 = JSAMPIMAGE input_buf
+; r12 = JDIMENSION in_row_group_ctr
+; r13 = JSAMPARRAY output_buf
+
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		3
+
+	align	16
+	global	EXTN(jsimd_h2v1_merged_upsample_sse2)
+
+EXTN(jsimd_h2v1_merged_upsample_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	push	rbx
+	collect_args
+
+	mov	rcx, r10	; col
+	test	rcx,rcx
+	jz	near .return
+
+	push	rcx
+
+	mov	rdi, r11
+	mov	rcx, r12
+	mov	rsi, JSAMPARRAY [rdi+0*SIZEOF_JSAMPARRAY]
+	mov	rbx, JSAMPARRAY [rdi+1*SIZEOF_JSAMPARRAY]
+	mov	rdx, JSAMPARRAY [rdi+2*SIZEOF_JSAMPARRAY]
+	mov	rdi, r13
+	mov	rsi, JSAMPROW [rsi+rcx*SIZEOF_JSAMPROW]		; inptr0
+	mov	rbx, JSAMPROW [rbx+rcx*SIZEOF_JSAMPROW]		; inptr1
+	mov	rdx, JSAMPROW [rdx+rcx*SIZEOF_JSAMPROW]		; inptr2
+	mov	rdi, JSAMPROW [rdi]				; outptr
+
+	pop	rcx			; col
+
+.columnloop:
+
+	movdqa    xmm6, XMMWORD [rbx]	; xmm6=Cb(0123456789ABCDEF)
+	movdqa    xmm7, XMMWORD [rdx]	; xmm7=Cr(0123456789ABCDEF)
+
+	pxor      xmm1,xmm1		; xmm1=(all 0's)
+	pcmpeqw   xmm3,xmm3
+	psllw     xmm3,7		; xmm3={0xFF80 0xFF80 0xFF80 0xFF80 ..}
+
+	movdqa    xmm4,xmm6
+	punpckhbw xmm6,xmm1		; xmm6=Cb(89ABCDEF)=CbH
+	punpcklbw xmm4,xmm1		; xmm4=Cb(01234567)=CbL
+	movdqa    xmm0,xmm7
+	punpckhbw xmm7,xmm1		; xmm7=Cr(89ABCDEF)=CrH
+	punpcklbw xmm0,xmm1		; xmm0=Cr(01234567)=CrL
+
+	paddw     xmm6,xmm3
+	paddw     xmm4,xmm3
+	paddw     xmm7,xmm3
+	paddw     xmm0,xmm3
+
+	; (Original)
+	; R = Y                + 1.40200 * Cr
+	; G = Y - 0.34414 * Cb - 0.71414 * Cr
+	; B = Y + 1.77200 * Cb
+	;
+	; (This implementation)
+	; R = Y                + 0.40200 * Cr + Cr
+	; G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
+	; B = Y - 0.22800 * Cb + Cb + Cb
+
+	movdqa	xmm5,xmm6		; xmm5=CbH
+	movdqa	xmm2,xmm4		; xmm2=CbL
+	paddw	xmm6,xmm6		; xmm6=2*CbH
+	paddw	xmm4,xmm4		; xmm4=2*CbL
+	movdqa	xmm1,xmm7		; xmm1=CrH
+	movdqa	xmm3,xmm0		; xmm3=CrL
+	paddw	xmm7,xmm7		; xmm7=2*CrH
+	paddw	xmm0,xmm0		; xmm0=2*CrL
+
+	pmulhw	xmm6,[PW_MF0228]	; xmm6=(2*CbH * -FIX(0.22800))
+	pmulhw	xmm4,[PW_MF0228]	; xmm4=(2*CbL * -FIX(0.22800))
+	pmulhw	xmm7,[PW_F0402]	; xmm7=(2*CrH * FIX(0.40200))
+	pmulhw	xmm0,[PW_F0402]	; xmm0=(2*CrL * FIX(0.40200))
+
+	paddw	xmm6,[PW_ONE]
+	paddw	xmm4,[PW_ONE]
+	psraw	xmm6,1			; xmm6=(CbH * -FIX(0.22800))
+	psraw	xmm4,1			; xmm4=(CbL * -FIX(0.22800))
+	paddw	xmm7,[PW_ONE]
+	paddw	xmm0,[PW_ONE]
+	psraw	xmm7,1			; xmm7=(CrH * FIX(0.40200))
+	psraw	xmm0,1			; xmm0=(CrL * FIX(0.40200))
+
+	paddw	xmm6,xmm5
+	paddw	xmm4,xmm2
+	paddw	xmm6,xmm5		; xmm6=(CbH * FIX(1.77200))=(B-Y)H
+	paddw	xmm4,xmm2		; xmm4=(CbL * FIX(1.77200))=(B-Y)L
+	paddw	xmm7,xmm1		; xmm7=(CrH * FIX(1.40200))=(R-Y)H
+	paddw	xmm0,xmm3		; xmm0=(CrL * FIX(1.40200))=(R-Y)L
+
+	movdqa	XMMWORD [wk(0)], xmm6	; wk(0)=(B-Y)H
+	movdqa	XMMWORD [wk(1)], xmm7	; wk(1)=(R-Y)H
+
+	movdqa    xmm6,xmm5
+	movdqa    xmm7,xmm2
+	punpcklwd xmm5,xmm1
+	punpckhwd xmm6,xmm1
+	pmaddwd   xmm5,[PW_MF0344_F0285]
+	pmaddwd   xmm6,[PW_MF0344_F0285]
+	punpcklwd xmm2,xmm3
+	punpckhwd xmm7,xmm3
+	pmaddwd   xmm2,[PW_MF0344_F0285]
+	pmaddwd   xmm7,[PW_MF0344_F0285]
+
+	paddd     xmm5,[PD_ONEHALF]
+	paddd     xmm6,[PD_ONEHALF]
+	psrad     xmm5,SCALEBITS
+	psrad     xmm6,SCALEBITS
+	paddd     xmm2,[PD_ONEHALF]
+	paddd     xmm7,[PD_ONEHALF]
+	psrad     xmm2,SCALEBITS
+	psrad     xmm7,SCALEBITS
+
+	packssdw  xmm5,xmm6	; xmm5=CbH*-FIX(0.344)+CrH*FIX(0.285)
+	packssdw  xmm2,xmm7	; xmm2=CbL*-FIX(0.344)+CrL*FIX(0.285)
+	psubw     xmm5,xmm1	; xmm5=CbH*-FIX(0.344)+CrH*-FIX(0.714)=(G-Y)H
+	psubw     xmm2,xmm3	; xmm2=CbL*-FIX(0.344)+CrL*-FIX(0.714)=(G-Y)L
+
+	movdqa	XMMWORD [wk(2)], xmm5	; wk(2)=(G-Y)H
+
+	mov	al,2			; Yctr
+	jmp	short .Yloop_1st
+
+.Yloop_2nd:
+	movdqa	xmm0, XMMWORD [wk(1)]	; xmm0=(R-Y)H
+	movdqa	xmm2, XMMWORD [wk(2)]	; xmm2=(G-Y)H
+	movdqa	xmm4, XMMWORD [wk(0)]	; xmm4=(B-Y)H
+
+.Yloop_1st:
+	movdqa	xmm7, XMMWORD [rsi]	; xmm7=Y(0123456789ABCDEF)
+
+	pcmpeqw	xmm6,xmm6
+	psrlw	xmm6,BYTE_BIT		; xmm6={0xFF 0x00 0xFF 0x00 ..}
+	pand	xmm6,xmm7		; xmm6=Y(02468ACE)=YE
+	psrlw	xmm7,BYTE_BIT		; xmm7=Y(13579BDF)=YO
+
+	movdqa	xmm1,xmm0		; xmm1=xmm0=(R-Y)(L/H)
+	movdqa	xmm3,xmm2		; xmm3=xmm2=(G-Y)(L/H)
+	movdqa	xmm5,xmm4		; xmm5=xmm4=(B-Y)(L/H)
+
+	paddw     xmm0,xmm6		; xmm0=((R-Y)+YE)=RE=R(02468ACE)
+	paddw     xmm1,xmm7		; xmm1=((R-Y)+YO)=RO=R(13579BDF)
+	packuswb  xmm0,xmm0		; xmm0=R(02468ACE********)
+	packuswb  xmm1,xmm1		; xmm1=R(13579BDF********)
+
+	paddw     xmm2,xmm6		; xmm2=((G-Y)+YE)=GE=G(02468ACE)
+	paddw     xmm3,xmm7		; xmm3=((G-Y)+YO)=GO=G(13579BDF)
+	packuswb  xmm2,xmm2		; xmm2=G(02468ACE********)
+	packuswb  xmm3,xmm3		; xmm3=G(13579BDF********)
+
+	paddw     xmm4,xmm6		; xmm4=((B-Y)+YE)=BE=B(02468ACE)
+	paddw     xmm5,xmm7		; xmm5=((B-Y)+YO)=BO=B(13579BDF)
+	packuswb  xmm4,xmm4		; xmm4=B(02468ACE********)
+	packuswb  xmm5,xmm5		; xmm5=B(13579BDF********)
+
+%if RGB_PIXELSIZE == 3 ; ---------------
+
+	; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
+	; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
+	; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
+	; xmmG=(** ** ** ** ** ** ** ** **), xmmH=(** ** ** ** ** ** ** ** **)
+
+	punpcklbw xmmA,xmmC	; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
+	punpcklbw xmmE,xmmB	; xmmE=(20 01 22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F)
+	punpcklbw xmmD,xmmF	; xmmD=(11 21 13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F)
+
+	movdqa    xmmG,xmmA
+	movdqa    xmmH,xmmA
+	punpcklwd xmmA,xmmE	; xmmA=(00 10 20 01 02 12 22 03 04 14 24 05 06 16 26 07)
+	punpckhwd xmmG,xmmE	; xmmG=(08 18 28 09 0A 1A 2A 0B 0C 1C 2C 0D 0E 1E 2E 0F)
+
+	psrldq    xmmH,2	; xmmH=(02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E -- --)
+	psrldq    xmmE,2	; xmmE=(22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F -- --)
+
+	movdqa    xmmC,xmmD
+	movdqa    xmmB,xmmD
+	punpcklwd xmmD,xmmH	; xmmD=(11 21 02 12 13 23 04 14 15 25 06 16 17 27 08 18)
+	punpckhwd xmmC,xmmH	; xmmC=(19 29 0A 1A 1B 2B 0C 1C 1D 2D 0E 1E 1F 2F -- --)
+
+	psrldq    xmmB,2	; xmmB=(13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F -- --)
+
+	movdqa    xmmF,xmmE
+	punpcklwd xmmE,xmmB	; xmmE=(22 03 13 23 24 05 15 25 26 07 17 27 28 09 19 29)
+	punpckhwd xmmF,xmmB	; xmmF=(2A 0B 1B 2B 2C 0D 1D 2D 2E 0F 1F 2F -- -- -- --)
+
+	pshufd    xmmH,xmmA,0x4E; xmmH=(04 14 24 05 06 16 26 07 00 10 20 01 02 12 22 03)
+	movdqa    xmmB,xmmE
+	punpckldq xmmA,xmmD	; xmmA=(00 10 20 01 11 21 02 12 02 12 22 03 13 23 04 14)
+	punpckldq xmmE,xmmH	; xmmE=(22 03 13 23 04 14 24 05 24 05 15 25 06 16 26 07)
+	punpckhdq xmmD,xmmB	; xmmD=(15 25 06 16 26 07 17 27 17 27 08 18 28 09 19 29)
+
+	pshufd    xmmH,xmmG,0x4E; xmmH=(0C 1C 2C 0D 0E 1E 2E 0F 08 18 28 09 0A 1A 2A 0B)
+	movdqa    xmmB,xmmF
+	punpckldq xmmG,xmmC	; xmmG=(08 18 28 09 19 29 0A 1A 0A 1A 2A 0B 1B 2B 0C 1C)
+	punpckldq xmmF,xmmH	; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 2C 0D 1D 2D 0E 1E 2E 0F)
+	punpckhdq xmmC,xmmB	; xmmC=(1D 2D 0E 1E 2E 0F 1F 2F 1F 2F -- -- -- -- -- --)
+
+	punpcklqdq xmmA,xmmE	; xmmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05)
+	punpcklqdq xmmD,xmmG	; xmmD=(15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
+	punpcklqdq xmmF,xmmC	; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F)
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jb	short .column_st32
+
+	test	rdi, SIZEOF_XMMWORD-1
+	jnz	short .out1
+	; --(aligned)-------------------
+	movntdq	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
+	movntdq	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
+	movntdq	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmF
+	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
+	jmp	short .out0
+.out1:	; --(unaligned)-----------------
+	pcmpeqb    xmmH,xmmH			; xmmH=(all 1's)
+	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmH			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmF,xmmH			; movntdqu XMMWORD [rdi], xmmF
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+.out0:
+	sub	rcx, byte SIZEOF_XMMWORD
+	jz	near .endcolumn
+
+	add	rsi, byte SIZEOF_XMMWORD	; inptr0
+	dec	al			; Yctr
+	jnz	near .Yloop_2nd
+
+	add	rbx, byte SIZEOF_XMMWORD	; inptr1
+	add	rdx, byte SIZEOF_XMMWORD	; inptr2
+	jmp	near .columnloop
+
+.column_st32:
+	pcmpeqb	xmmH,xmmH			; xmmH=(all 1's)
+	lea	rcx, [rcx+rcx*2]		; imul ecx, RGB_PIXELSIZE
+	cmp	rcx, byte 2*SIZEOF_XMMWORD
+	jb	short .column_st16
+	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmH			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmF
+	sub	rcx, byte 2*SIZEOF_XMMWORD
+	jmp	short .column_st15
+.column_st16:
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jb	short .column_st15
+	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmD
+	sub	rcx, byte SIZEOF_XMMWORD
+.column_st15:
+	mov	rax,rcx
+	xor	rcx, byte 0x0F
+	shl	rcx, 2
+	movd	xmmB,ecx
+	psrlq	xmmH,4
+	pcmpeqb	xmmE,xmmE
+	psrlq	xmmH,xmmB
+	psrlq	xmmE,xmmB
+	punpcklbw xmmE,xmmH
+	; ----------------
+	mov	rcx,rdi
+	and	rcx, byte SIZEOF_XMMWORD-1
+	jz	short .adj0
+	add	rax,rcx
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	short .adj0
+	and	rdi, byte (-SIZEOF_XMMWORD)	; align to 16-byte boundary
+	shl	rcx, 3			; pslldq xmmA,ecx & pslldq xmmE,ecx
+	movdqa	xmmG,xmmA
+	movdqa	xmmC,xmmE
+	pslldq	xmmA, SIZEOF_XMMWORD/2
+	pslldq	xmmE, SIZEOF_XMMWORD/2
+	movd	xmmD,ecx
+	sub	rcx, byte (SIZEOF_XMMWORD/2)*BYTE_BIT
+	jb	short .adj1
+	movd	xmmF,ecx
+	psllq	xmmA,xmmF
+	psllq	xmmE,xmmF
+	jmp	short .adj0
+.adj1:	neg	rcx
+	movd	xmmF,ecx
+	psrlq	xmmA,xmmF
+	psrlq	xmmE,xmmF
+	psllq	xmmG,xmmD
+	psllq	xmmC,xmmD
+	por	xmmA,xmmG
+	por	xmmE,xmmC
+.adj0:	; ----------------
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [edi], xmmA
+
+%else ; RGB_PIXELSIZE == 4 ; -----------
+
+%ifdef RGBX_FILLER_0XFF
+	pcmpeqb   xmm6,xmm6		; xmm6=XE=X(02468ACE********)
+	pcmpeqb   xmm7,xmm7		; xmm7=XO=X(13579BDF********)
+%else
+	pxor      xmm6,xmm6		; xmm6=XE=X(02468ACE********)
+	pxor      xmm7,xmm7		; xmm7=XO=X(13579BDF********)
+%endif
+	; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
+	; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
+	; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
+	; xmmG=(30 32 34 36 38 3A 3C 3E **), xmmH=(31 33 35 37 39 3B 3D 3F **)
+
+	punpcklbw xmmA,xmmC	; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
+	punpcklbw xmmE,xmmG	; xmmE=(20 30 22 32 24 34 26 36 28 38 2A 3A 2C 3C 2E 3E)
+	punpcklbw xmmB,xmmD	; xmmB=(01 11 03 13 05 15 07 17 09 19 0B 1B 0D 1D 0F 1F)
+	punpcklbw xmmF,xmmH	; xmmF=(21 31 23 33 25 35 27 37 29 39 2B 3B 2D 3D 2F 3F)
+
+	movdqa    xmmC,xmmA
+	punpcklwd xmmA,xmmE	; xmmA=(00 10 20 30 02 12 22 32 04 14 24 34 06 16 26 36)
+	punpckhwd xmmC,xmmE	; xmmC=(08 18 28 38 0A 1A 2A 3A 0C 1C 2C 3C 0E 1E 2E 3E)
+	movdqa    xmmG,xmmB
+	punpcklwd xmmB,xmmF	; xmmB=(01 11 21 31 03 13 23 33 05 15 25 35 07 17 27 37)
+	punpckhwd xmmG,xmmF	; xmmG=(09 19 29 39 0B 1B 2B 3B 0D 1D 2D 3D 0F 1F 2F 3F)
+
+	movdqa    xmmD,xmmA
+	punpckldq xmmA,xmmB	; xmmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33)
+	punpckhdq xmmD,xmmB	; xmmD=(04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37)
+	movdqa    xmmH,xmmC
+	punpckldq xmmC,xmmG	; xmmC=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B)
+	punpckhdq xmmH,xmmG	; xmmH=(0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F)
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jb	short .column_st32
+
+	test	rdi, SIZEOF_XMMWORD-1
+	jnz	short .out1
+	; --(aligned)-------------------
+	movntdq	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
+	movntdq	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
+	movntdq	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmC
+	movntdq	XMMWORD [rdi+3*SIZEOF_XMMWORD], xmmH
+	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
+	jmp	short .out0
+.out1:	; --(unaligned)-----------------
+	pcmpeqb    xmmE,xmmE			; xmmE=(all 1's)
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmE			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmC,xmmE			; movntdqu XMMWORD [rdi], xmmC
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmH,xmmE			; movntdqu XMMWORD [rdi], xmmH
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+.out0:
+	sub	rcx, byte SIZEOF_XMMWORD
+	jz	near .endcolumn
+
+	add	rsi, byte SIZEOF_XMMWORD	; inptr0
+	dec	al			; Yctr
+	jnz	near .Yloop_2nd
+
+	add	rbx, byte SIZEOF_XMMWORD	; inptr1
+	add	rdx, byte SIZEOF_XMMWORD	; inptr2
+	jmp	near .columnloop
+
+.column_st32:
+	pcmpeqb	xmmE,xmmE			; xmmE=(all 1's)
+	cmp	rcx, byte SIZEOF_XMMWORD/2
+	jb	short .column_st16
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	maskmovdqu xmmD,xmmE			; movntdqu XMMWORD [rdi], xmmD
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmC
+	movdqa	xmmD,xmmH
+	sub	rcx, byte SIZEOF_XMMWORD/2
+.column_st16:
+	cmp	rcx, byte SIZEOF_XMMWORD/4
+	jb	short .column_st15
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [edi], xmmA
+	add	rdi, byte SIZEOF_XMMWORD	; outptr
+	movdqa	xmmA,xmmD
+	sub	rcx, byte SIZEOF_XMMWORD/4
+.column_st15:
+	cmp	rcx, byte SIZEOF_XMMWORD/16
+	jb	near .endcolumn
+	mov	rax,rcx
+	xor	rcx, byte 0x03
+	inc	rcx
+	shl	rcx, 4
+	movd	xmmF,ecx
+	psrlq	xmmE,xmmF
+	punpcklbw xmmE,xmmE
+	; ----------------
+	mov	rcx,rdi
+	and	rcx, byte SIZEOF_XMMWORD-1
+	jz	short .adj0
+	lea	rax, [rcx+rax*4]	; RGB_PIXELSIZE
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	short .adj0
+	and	rdi, byte (-SIZEOF_XMMWORD)	; align to 16-byte boundary
+	shl	rcx, 3			; pslldq xmmA,ecx & pslldq xmmE,ecx
+	movdqa	xmmB,xmmA
+	movdqa	xmmG,xmmE
+	pslldq	xmmA, SIZEOF_XMMWORD/2
+	pslldq	xmmE, SIZEOF_XMMWORD/2
+	movd	xmmC,ecx
+	sub	rcx, byte (SIZEOF_XMMWORD/2)*BYTE_BIT
+	jb	short .adj1
+	movd	xmmH,ecx
+	psllq	xmmA,xmmH
+	psllq	xmmE,xmmH
+	jmp	short .adj0
+.adj1:	neg	rcx
+	movd	xmmH,ecx
+	psrlq	xmmA,xmmH
+	psrlq	xmmE,xmmH
+	psllq	xmmB,xmmC
+	psllq	xmmG,xmmC
+	por	xmmA,xmmB
+	por	xmmE,xmmG
+.adj0:	; ----------------
+	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [edi], xmmA
+
+%endif ; RGB_PIXELSIZE ; ---------------
+
+.endcolumn:
+	sfence		; flush the write buffer
+
+.return:
+	uncollect_args
+	pop	rbx
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
+;
+; GLOBAL(void)
+; jsimd_h2v2_merged_upsample_sse2 (JDIMENSION output_width,
+;                                  JSAMPIMAGE input_buf,
+;                                  JDIMENSION in_row_group_ctr,
+;                                  JSAMPARRAY output_buf);
+;
+
+; r10 = JDIMENSION output_width
+; r11 = JSAMPIMAGE input_buf
+; r12 = JDIMENSION in_row_group_ctr
+; r13 = JSAMPARRAY output_buf
+
+	align	16
+	global	EXTN(jsimd_h2v2_merged_upsample_sse2)
+
+EXTN(jsimd_h2v2_merged_upsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	push	rbx
+	collect_args
+
+	mov	rax, r10
+
+	mov	rdi, r11
+	mov	rcx, r12
+	mov	rsi, JSAMPARRAY [rdi+0*SIZEOF_JSAMPARRAY]
+	mov	rbx, JSAMPARRAY [rdi+1*SIZEOF_JSAMPARRAY]
+	mov	rdx, JSAMPARRAY [rdi+2*SIZEOF_JSAMPARRAY]
+	mov	rdi, r13
+	lea	rsi, [rsi+rcx*SIZEOF_JSAMPROW]
+
+	push	rdx			; inptr2
+	push	rbx			; inptr1
+	push	rsi			; inptr00
+	mov	rbx,rsp
+
+	push	rdi
+	push	rcx
+	push	rax
+
+	mov rdx, rcx
+	mov rcx, rdi
+	mov	rdi, rax
+	mov rsi, rbx
+
+	call	EXTN(jsimd_h2v1_merged_upsample_sse2)
+
+	pop rax
+	pop rcx
+	pop rdi
+	pop rsi
+	pop rbx
+	pop rdx
+
+	add	rdi, byte SIZEOF_JSAMPROW	; outptr1
+	add	rsi, byte SIZEOF_JSAMPROW	; inptr01
+
+	push	rdx			; inptr2
+	push	rbx			; inptr1
+	push	rsi			; inptr00
+	mov	rbx,rsp
+
+	push	rdi
+	push	rcx
+	push	rax
+
+	mov rdx, rcx
+	mov rcx, rdi
+	mov	rdi, rax
+	mov rsi, rbx
+
+	call	EXTN(jsimd_h2v1_merged_upsample_sse2)
+
+	pop rax
+	pop rcx
+	pop rdi
+	pop rsi
+	pop rbx
+	pop rdx
+
+	uncollect_args
+	pop	rbx
+	pop	rbp
+	ret
diff --git a/simd/jdsamss2-64.asm b/simd/jdsamss2-64.asm
new file mode 100644
index 0000000..1f7b1f5
--- /dev/null
+++ b/simd/jdsamss2-64.asm
@@ -0,0 +1,664 @@
+;
+; jdsamss2.asm - upsampling (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_fancy_upsample_sse2)
+
+EXTN(jconst_fancy_upsample_sse2):
+
+PW_ONE		times 8 dw  1
+PW_TWO		times 8 dw  2
+PW_THREE	times 8 dw  3
+PW_SEVEN	times 8 dw  7
+PW_EIGHT	times 8 dw  8
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Fancy processing for the common case of 2:1 horizontal and 1:1 vertical.
+;
+; The upsampling algorithm is linear interpolation between pixel centers,
+; also known as a "triangle filter".  This is a good compromise between
+; speed and visual quality.  The centers of the output pixels are 1/4 and 3/4
+; of the way between input pixel centers.
+;
+; GLOBAL(void)
+; jsimd_h2v1_fancy_upsample_sse2 (int max_v_samp_factor,
+;                                 JDIMENSION downsampled_width,
+;                                 JSAMPARRAY input_data,
+;                                 JSAMPARRAY * output_data_ptr);
+;
+
+; r10 = int max_v_samp_factor
+; r11 = JDIMENSION downsampled_width
+; r12 = JSAMPARRAY input_data
+; r13 = JSAMPARRAY * output_data_ptr
+
+	align	16
+	global	EXTN(jsimd_h2v1_fancy_upsample_sse2)
+
+EXTN(jsimd_h2v1_fancy_upsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov	rax, r11  ; colctr
+	test	rax,rax
+	jz	near .return
+
+	mov	rcx, r10	; rowctr
+	test	rcx,rcx
+	jz	near .return
+
+	mov	rsi, r12	; input_data
+	mov	rdi, r13
+	mov	rdi, JSAMPARRAY [rdi]			; output_data
+.rowloop:
+	push	rax			; colctr
+	push	rdi
+	push	rsi
+
+	mov	rsi, JSAMPROW [rsi]	; inptr
+	mov	rdi, JSAMPROW [rdi]	; outptr
+
+	test	rax, SIZEOF_XMMWORD-1
+	jz	short .skip
+	mov	dl, JSAMPLE [rsi+(rax-1)*SIZEOF_JSAMPLE]
+	mov	JSAMPLE [rsi+rax*SIZEOF_JSAMPLE], dl	; insert a dummy sample
+.skip:
+	pxor	xmm0,xmm0		; xmm0=(all 0's)
+	pcmpeqb	xmm7,xmm7
+	psrldq	xmm7,(SIZEOF_XMMWORD-1)
+	pand	xmm7, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+
+	add	rax, byte SIZEOF_XMMWORD-1
+	and	rax, byte -SIZEOF_XMMWORD
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	short .columnloop
+
+.columnloop_last:
+	pcmpeqb	xmm6,xmm6
+	pslldq	xmm6,(SIZEOF_XMMWORD-1)
+	pand	xmm6, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	jmp	short .upsample
+
+.columnloop:
+	movdqa	xmm6, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+	pslldq	xmm6,(SIZEOF_XMMWORD-1)
+
+.upsample:
+	movdqa	xmm1, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqa	xmm2,xmm1
+	movdqa	xmm3,xmm1		; xmm1=( 0  1  2 ... 13 14 15)
+	pslldq	xmm2,1			; xmm2=(--  0  1 ... 12 13 14)
+	psrldq	xmm3,1			; xmm3=( 1  2  3 ... 14 15 --)
+
+	por	xmm2,xmm7		; xmm2=(-1  0  1 ... 12 13 14)
+	por	xmm3,xmm6		; xmm3=( 1  2  3 ... 14 15 16)
+
+	movdqa	xmm7,xmm1
+	psrldq	xmm7,(SIZEOF_XMMWORD-1)	; xmm7=(15 -- -- ... -- -- --)
+
+	movdqa    xmm4,xmm1
+	punpcklbw xmm1,xmm0		; xmm1=( 0  1  2  3  4  5  6  7)
+	punpckhbw xmm4,xmm0		; xmm4=( 8  9 10 11 12 13 14 15)
+	movdqa    xmm5,xmm2
+	punpcklbw xmm2,xmm0		; xmm2=(-1  0  1  2  3  4  5  6)
+	punpckhbw xmm5,xmm0		; xmm5=( 7  8  9 10 11 12 13 14)
+	movdqa    xmm6,xmm3
+	punpcklbw xmm3,xmm0		; xmm3=( 1  2  3  4  5  6  7  8)
+	punpckhbw xmm6,xmm0		; xmm6=( 9 10 11 12 13 14 15 16)
+
+	pmullw	xmm1,[PW_THREE]
+	pmullw	xmm4,[PW_THREE]
+	paddw	xmm2,[PW_ONE]
+	paddw	xmm5,[PW_ONE]
+	paddw	xmm3,[PW_TWO]
+	paddw	xmm6,[PW_TWO]
+
+	paddw	xmm2,xmm1
+	paddw	xmm5,xmm4
+	psrlw	xmm2,2			; xmm2=OutLE=( 0  2  4  6  8 10 12 14)
+	psrlw	xmm5,2			; xmm5=OutHE=(16 18 20 22 24 26 28 30)
+	paddw	xmm3,xmm1
+	paddw	xmm6,xmm4
+	psrlw	xmm3,2			; xmm3=OutLO=( 1  3  5  7  9 11 13 15)
+	psrlw	xmm6,2			; xmm6=OutHO=(17 19 21 23 25 27 29 31)
+
+	psllw	xmm3,BYTE_BIT
+	psllw	xmm6,BYTE_BIT
+	por	xmm2,xmm3		; xmm2=OutL=( 0  1  2 ... 13 14 15)
+	por	xmm5,xmm6		; xmm5=OutH=(16 17 18 ... 29 30 31)
+
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm2
+	movdqa	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmm5
+
+	sub	rax, byte SIZEOF_XMMWORD
+	add	rsi, byte 1*SIZEOF_XMMWORD	; inptr
+	add	rdi, byte 2*SIZEOF_XMMWORD	; outptr
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	near .columnloop
+	test	eax,eax
+	jnz	near .columnloop_last
+
+	pop	rsi
+	pop	rdi
+	pop	rax
+
+	add	rsi, byte SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte SIZEOF_JSAMPROW	; output_data
+	dec	rcx				; rowctr
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Fancy processing for the common case of 2:1 horizontal and 2:1 vertical.
+; Again a triangle filter; see comments for h2v1 case, above.
+;
+; GLOBAL(void)
+; jsimd_h2v2_fancy_upsample_sse2 (int max_v_samp_factor,
+;                                 JDIMENSION downsampled_width,
+;                                 JSAMPARRAY input_data,
+;                                 JSAMPARRAY * output_data_ptr);
+;
+
+; r10 = int max_v_samp_factor
+; r11 = JDIMENSION downsampled_width
+; r12 = JSAMPARRAY input_data
+; r13 = JSAMPARRAY * output_data_ptr
+
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		4
+
+	align	16
+	global	EXTN(jsimd_h2v2_fancy_upsample_sse2)
+
+EXTN(jsimd_h2v2_fancy_upsample_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	push	rbx
+	collect_args
+
+	mov	rax, r11  ; colctr
+	test	rax,rax
+	jz	near .return
+
+	mov	rcx, r10	; rowctr
+	test	rcx,rcx
+	jz	near .return
+
+	mov	rsi, r12	; input_data
+	mov	rdi, r13
+	mov	rdi, JSAMPARRAY [rdi]			; output_data
+.rowloop:
+	push	rax					; colctr
+	push	rcx
+	push	rdi
+	push	rsi
+
+	mov	rcx, JSAMPROW [rsi-1*SIZEOF_JSAMPROW]	; inptr1(above)
+	mov	rbx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]	; inptr0
+	mov	rsi, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]	; inptr1(below)
+	mov	rdx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]	; outptr0
+	mov	rdi, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]	; outptr1
+
+	test	rax, SIZEOF_XMMWORD-1
+	jz	short .skip
+	push	rdx
+	mov	dl, JSAMPLE [rcx+(rax-1)*SIZEOF_JSAMPLE]
+	mov	JSAMPLE [rcx+rax*SIZEOF_JSAMPLE], dl
+	mov	dl, JSAMPLE [rbx+(rax-1)*SIZEOF_JSAMPLE]
+	mov	JSAMPLE [rbx+rax*SIZEOF_JSAMPLE], dl
+	mov	dl, JSAMPLE [rsi+(rax-1)*SIZEOF_JSAMPLE]
+	mov	JSAMPLE [rsi+rax*SIZEOF_JSAMPLE], dl	; insert a dummy sample
+	pop	rdx
+.skip:
+	; -- process the first column block
+
+	movdqa	xmm0, XMMWORD [rbx+0*SIZEOF_XMMWORD]	; xmm0=row[ 0][0]
+	movdqa	xmm1, XMMWORD [rcx+0*SIZEOF_XMMWORD]	; xmm1=row[-1][0]
+	movdqa	xmm2, XMMWORD [rsi+0*SIZEOF_XMMWORD]	; xmm2=row[+1][0]
+
+	pxor      xmm3,xmm3		; xmm3=(all 0's)
+	movdqa    xmm4,xmm0
+	punpcklbw xmm0,xmm3		; xmm0=row[ 0]( 0  1  2  3  4  5  6  7)
+	punpckhbw xmm4,xmm3		; xmm4=row[ 0]( 8  9 10 11 12 13 14 15)
+	movdqa    xmm5,xmm1
+	punpcklbw xmm1,xmm3		; xmm1=row[-1]( 0  1  2  3  4  5  6  7)
+	punpckhbw xmm5,xmm3		; xmm5=row[-1]( 8  9 10 11 12 13 14 15)
+	movdqa    xmm6,xmm2
+	punpcklbw xmm2,xmm3		; xmm2=row[+1]( 0  1  2  3  4  5  6  7)
+	punpckhbw xmm6,xmm3		; xmm6=row[+1]( 8  9 10 11 12 13 14 15)
+
+	pmullw	xmm0,[PW_THREE]
+	pmullw	xmm4,[PW_THREE]
+
+	pcmpeqb	xmm7,xmm7
+	psrldq	xmm7,(SIZEOF_XMMWORD-2)
+
+	paddw	xmm1,xmm0		; xmm1=Int0L=( 0  1  2  3  4  5  6  7)
+	paddw	xmm5,xmm4		; xmm5=Int0H=( 8  9 10 11 12 13 14 15)
+	paddw	xmm2,xmm0		; xmm2=Int1L=( 0  1  2  3  4  5  6  7)
+	paddw	xmm6,xmm4		; xmm6=Int1H=( 8  9 10 11 12 13 14 15)
+
+	movdqa	XMMWORD [rdx+0*SIZEOF_XMMWORD], xmm1	; temporarily save
+	movdqa	XMMWORD [rdx+1*SIZEOF_XMMWORD], xmm5	; the intermediate data
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm2
+	movdqa	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmm6
+
+	pand	xmm1,xmm7		; xmm1=( 0 -- -- -- -- -- -- --)
+	pand	xmm2,xmm7		; xmm2=( 0 -- -- -- -- -- -- --)
+
+	movdqa	XMMWORD [wk(0)], xmm1
+	movdqa	XMMWORD [wk(1)], xmm2
+
+	add	rax, byte SIZEOF_XMMWORD-1
+	and	rax, byte -SIZEOF_XMMWORD
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	short .columnloop
+
+.columnloop_last:
+	; -- process the last column block
+
+	pcmpeqb	xmm1,xmm1
+	pslldq	xmm1,(SIZEOF_XMMWORD-2)
+	movdqa	xmm2,xmm1
+
+	pand	xmm1, XMMWORD [edx+1*SIZEOF_XMMWORD]
+	pand	xmm2, XMMWORD [edi+1*SIZEOF_XMMWORD]
+
+	movdqa	XMMWORD [wk(2)], xmm1	; xmm1=(-- -- -- -- -- -- -- 15)
+	movdqa	XMMWORD [wk(3)], xmm2	; xmm2=(-- -- -- -- -- -- -- 15)
+
+	jmp	near .upsample
+
+.columnloop:
+	; -- process the next column block
+
+	movdqa	xmm0, XMMWORD [rbx+1*SIZEOF_XMMWORD]	; xmm0=row[ 0][1]
+	movdqa	xmm1, XMMWORD [rcx+1*SIZEOF_XMMWORD]	; xmm1=row[-1][1]
+	movdqa	xmm2, XMMWORD [rsi+1*SIZEOF_XMMWORD]	; xmm2=row[+1][1]
+
+	pxor      xmm3,xmm3		; xmm3=(all 0's)
+	movdqa    xmm4,xmm0
+	punpcklbw xmm0,xmm3		; xmm0=row[ 0]( 0  1  2  3  4  5  6  7)
+	punpckhbw xmm4,xmm3		; xmm4=row[ 0]( 8  9 10 11 12 13 14 15)
+	movdqa    xmm5,xmm1
+	punpcklbw xmm1,xmm3		; xmm1=row[-1]( 0  1  2  3  4  5  6  7)
+	punpckhbw xmm5,xmm3		; xmm5=row[-1]( 8  9 10 11 12 13 14 15)
+	movdqa    xmm6,xmm2
+	punpcklbw xmm2,xmm3		; xmm2=row[+1]( 0  1  2  3  4  5  6  7)
+	punpckhbw xmm6,xmm3		; xmm6=row[+1]( 8  9 10 11 12 13 14 15)
+
+	pmullw	xmm0,[PW_THREE]
+	pmullw	xmm4,[PW_THREE]
+
+	paddw	xmm1,xmm0		; xmm1=Int0L=( 0  1  2  3  4  5  6  7)
+	paddw	xmm5,xmm4		; xmm5=Int0H=( 8  9 10 11 12 13 14 15)
+	paddw	xmm2,xmm0		; xmm2=Int1L=( 0  1  2  3  4  5  6  7)
+	paddw	xmm6,xmm4		; xmm6=Int1H=( 8  9 10 11 12 13 14 15)
+
+	movdqa	XMMWORD [rdx+2*SIZEOF_XMMWORD], xmm1	; temporarily save
+	movdqa	XMMWORD [rdx+3*SIZEOF_XMMWORD], xmm5	; the intermediate data
+	movdqa	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmm2
+	movdqa	XMMWORD [rdi+3*SIZEOF_XMMWORD], xmm6
+
+	pslldq	xmm1,(SIZEOF_XMMWORD-2)	; xmm1=(-- -- -- -- -- -- --  0)
+	pslldq	xmm2,(SIZEOF_XMMWORD-2)	; xmm2=(-- -- -- -- -- -- --  0)
+
+	movdqa	XMMWORD [wk(2)], xmm1
+	movdqa	XMMWORD [wk(3)], xmm2
+
+.upsample:
+	; -- process the upper row
+
+	movdqa	xmm7, XMMWORD [rdx+0*SIZEOF_XMMWORD]
+	movdqa	xmm3, XMMWORD [rdx+1*SIZEOF_XMMWORD]
+
+	movdqa	xmm0,xmm7		; xmm7=Int0L=( 0  1  2  3  4  5  6  7)
+	movdqa	xmm4,xmm3		; xmm3=Int0H=( 8  9 10 11 12 13 14 15)
+	psrldq	xmm0,2			; xmm0=( 1  2  3  4  5  6  7 --)
+	pslldq	xmm4,(SIZEOF_XMMWORD-2)	; xmm4=(-- -- -- -- -- -- --  8)
+	movdqa	xmm5,xmm7
+	movdqa	xmm6,xmm3
+	psrldq	xmm5,(SIZEOF_XMMWORD-2)	; xmm5=( 7 -- -- -- -- -- -- --)
+	pslldq	xmm6,2			; xmm6=(--  8  9 10 11 12 13 14)
+
+	por	xmm0,xmm4		; xmm0=( 1  2  3  4  5  6  7  8)
+	por	xmm5,xmm6		; xmm5=( 7  8  9 10 11 12 13 14)
+
+	movdqa	xmm1,xmm7
+	movdqa	xmm2,xmm3
+	pslldq	xmm1,2			; xmm1=(--  0  1  2  3  4  5  6)
+	psrldq	xmm2,2			; xmm2=( 9 10 11 12 13 14 15 --)
+	movdqa	xmm4,xmm3
+	psrldq	xmm4,(SIZEOF_XMMWORD-2)	; xmm4=(15 -- -- -- -- -- -- --)
+
+	por	xmm1, XMMWORD [wk(0)]	; xmm1=(-1  0  1  2  3  4  5  6)
+	por	xmm2, XMMWORD [wk(2)]	; xmm2=( 9 10 11 12 13 14 15 16)
+
+	movdqa	XMMWORD [wk(0)], xmm4
+
+	pmullw	xmm7,[PW_THREE]
+	pmullw	xmm3,[PW_THREE]
+	paddw	xmm1,[PW_EIGHT]
+	paddw	xmm5,[PW_EIGHT]
+	paddw	xmm0,[PW_SEVEN]
+	paddw	xmm2,[PW_SEVEN]
+
+	paddw	xmm1,xmm7
+	paddw	xmm5,xmm3
+	psrlw	xmm1,4			; xmm1=Out0LE=( 0  2  4  6  8 10 12 14)
+	psrlw	xmm5,4			; xmm5=Out0HE=(16 18 20 22 24 26 28 30)
+	paddw	xmm0,xmm7
+	paddw	xmm2,xmm3
+	psrlw	xmm0,4			; xmm0=Out0LO=( 1  3  5  7  9 11 13 15)
+	psrlw	xmm2,4			; xmm2=Out0HO=(17 19 21 23 25 27 29 31)
+
+	psllw	xmm0,BYTE_BIT
+	psllw	xmm2,BYTE_BIT
+	por	xmm1,xmm0		; xmm1=Out0L=( 0  1  2 ... 13 14 15)
+	por	xmm5,xmm2		; xmm5=Out0H=(16 17 18 ... 29 30 31)
+
+	movdqa	XMMWORD [rdx+0*SIZEOF_XMMWORD], xmm1
+	movdqa	XMMWORD [rdx+1*SIZEOF_XMMWORD], xmm5
+
+	; -- process the lower row
+
+	movdqa	xmm6, XMMWORD [rdi+0*SIZEOF_XMMWORD]
+	movdqa	xmm4, XMMWORD [rdi+1*SIZEOF_XMMWORD]
+
+	movdqa	xmm7,xmm6		; xmm6=Int1L=( 0  1  2  3  4  5  6  7)
+	movdqa	xmm3,xmm4		; xmm4=Int1H=( 8  9 10 11 12 13 14 15)
+	psrldq	xmm7,2			; xmm7=( 1  2  3  4  5  6  7 --)
+	pslldq	xmm3,(SIZEOF_XMMWORD-2)	; xmm3=(-- -- -- -- -- -- --  8)
+	movdqa	xmm0,xmm6
+	movdqa	xmm2,xmm4
+	psrldq	xmm0,(SIZEOF_XMMWORD-2)	; xmm0=( 7 -- -- -- -- -- -- --)
+	pslldq	xmm2,2			; xmm2=(--  8  9 10 11 12 13 14)
+
+	por	xmm7,xmm3		; xmm7=( 1  2  3  4  5  6  7  8)
+	por	xmm0,xmm2		; xmm0=( 7  8  9 10 11 12 13 14)
+
+	movdqa	xmm1,xmm6
+	movdqa	xmm5,xmm4
+	pslldq	xmm1,2			; xmm1=(--  0  1  2  3  4  5  6)
+	psrldq	xmm5,2			; xmm5=( 9 10 11 12 13 14 15 --)
+	movdqa	xmm3,xmm4
+	psrldq	xmm3,(SIZEOF_XMMWORD-2)	; xmm3=(15 -- -- -- -- -- -- --)
+
+	por	xmm1, XMMWORD [wk(1)]	; xmm1=(-1  0  1  2  3  4  5  6)
+	por	xmm5, XMMWORD [wk(3)]	; xmm5=( 9 10 11 12 13 14 15 16)
+
+	movdqa	XMMWORD [wk(1)], xmm3
+
+	pmullw	xmm6,[PW_THREE]
+	pmullw	xmm4,[PW_THREE]
+	paddw	xmm1,[PW_EIGHT]
+	paddw	xmm0,[PW_EIGHT]
+	paddw	xmm7,[PW_SEVEN]
+	paddw	xmm5,[PW_SEVEN]
+
+	paddw	xmm1,xmm6
+	paddw	xmm0,xmm4
+	psrlw	xmm1,4			; xmm1=Out1LE=( 0  2  4  6  8 10 12 14)
+	psrlw	xmm0,4			; xmm0=Out1HE=(16 18 20 22 24 26 28 30)
+	paddw	xmm7,xmm6
+	paddw	xmm5,xmm4
+	psrlw	xmm7,4			; xmm7=Out1LO=( 1  3  5  7  9 11 13 15)
+	psrlw	xmm5,4			; xmm5=Out1HO=(17 19 21 23 25 27 29 31)
+
+	psllw	xmm7,BYTE_BIT
+	psllw	xmm5,BYTE_BIT
+	por	xmm1,xmm7		; xmm1=Out1L=( 0  1  2 ... 13 14 15)
+	por	xmm0,xmm5		; xmm0=Out1H=(16 17 18 ... 29 30 31)
+
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm1
+	movdqa	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmm0
+
+	sub	rax, byte SIZEOF_XMMWORD
+	add	rcx, byte 1*SIZEOF_XMMWORD	; inptr1(above)
+	add	rbx, byte 1*SIZEOF_XMMWORD	; inptr0
+	add	rsi, byte 1*SIZEOF_XMMWORD	; inptr1(below)
+	add	rdx, byte 2*SIZEOF_XMMWORD	; outptr0
+	add	rdi, byte 2*SIZEOF_XMMWORD	; outptr1
+	cmp	rax, byte SIZEOF_XMMWORD
+	ja	near .columnloop
+	test	rax,rax
+	jnz	near .columnloop_last
+
+	pop	rsi
+	pop	rdi
+	pop	rcx
+	pop	rax
+
+	add	rsi, byte 1*SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte 2*SIZEOF_JSAMPROW	; output_data
+	sub	rcx, byte 2			; rowctr
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbx
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Fast processing for the common case of 2:1 horizontal and 1:1 vertical.
+; It's still a box filter.
+;
+; GLOBAL(void)
+; jsimd_h2v1_upsample_sse2 (int max_v_samp_factor,
+;                           JDIMENSION output_width,
+;                           JSAMPARRAY input_data,
+;                           JSAMPARRAY * output_data_ptr);
+;
+
+; r10 = int max_v_samp_factor
+; r11 = JDIMENSION output_width
+; r12 = JSAMPARRAY input_data
+; r13 = JSAMPARRAY * output_data_ptr
+
+	align	16
+	global	EXTN(jsimd_h2v1_upsample_sse2)
+
+EXTN(jsimd_h2v1_upsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov	rdx, r11
+	add	rdx, byte (2*SIZEOF_XMMWORD)-1
+	and	rdx, byte -(2*SIZEOF_XMMWORD)
+	jz	near .return
+
+	mov	rcx, r10	; rowctr
+	test	rcx,rcx
+	jz	short .return
+
+	mov	rsi, r12 ; input_data
+	mov	rdi, r13
+	mov	rdi, JSAMPARRAY [rdi]			; output_data
+.rowloop:
+	push	rdi
+	push	rsi
+
+	mov	rsi, JSAMPROW [rsi]		; inptr
+	mov	rdi, JSAMPROW [rdi]		; outptr
+	mov	rax,rdx				; colctr
+.columnloop:
+
+	movdqa	xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+
+	movdqa    xmm1,xmm0
+	punpcklbw xmm0,xmm0
+	punpckhbw xmm1,xmm1
+
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
+	movdqa	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmm1
+
+	sub	rax, byte 2*SIZEOF_XMMWORD
+	jz	short .nextrow
+
+	movdqa	xmm2, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+
+	movdqa    xmm3,xmm2
+	punpcklbw xmm2,xmm2
+	punpckhbw xmm3,xmm3
+
+	movdqa	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmm2
+	movdqa	XMMWORD [rdi+3*SIZEOF_XMMWORD], xmm3
+
+	sub	rax, byte 2*SIZEOF_XMMWORD
+	jz	short .nextrow
+
+	add	rsi, byte 2*SIZEOF_XMMWORD	; inptr
+	add	rdi, byte 4*SIZEOF_XMMWORD	; outptr
+	jmp	short .columnloop
+
+.nextrow:
+	pop	rsi
+	pop	rdi
+
+	add	rsi, byte SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte SIZEOF_JSAMPROW	; output_data
+	dec	rcx				; rowctr
+	jg	short .rowloop
+
+.return:
+	uncollect_args
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Fast processing for the common case of 2:1 horizontal and 2:1 vertical.
+; It's still a box filter.
+;
+; GLOBAL(void)
+; jsimd_h2v2_upsample_sse2 (nt max_v_samp_factor,
+;                           JDIMENSION output_width,
+;                           JSAMPARRAY input_data,
+;                           JSAMPARRAY * output_data_ptr);
+;
+
+; r10 = int max_v_samp_factor
+; r11 = JDIMENSION output_width
+; r12 = JSAMPARRAY input_data
+; r13 = JSAMPARRAY * output_data_ptr
+
+	align	16
+	global	EXTN(jsimd_h2v2_upsample_sse2)
+
+EXTN(jsimd_h2v2_upsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	push	rbx
+	collect_args
+
+	mov	rdx, r11
+	add	rdx, byte (2*SIZEOF_XMMWORD)-1
+	and	rdx, byte -(2*SIZEOF_XMMWORD)
+	jz	near .return
+
+	mov	rcx, r10	; rowctr
+	test	rcx,rcx
+	jz	near .return
+
+	mov	rsi, r12	; input_data
+	mov	rdi, r13
+	mov	rdi, JSAMPARRAY [rdi]			; output_data
+.rowloop:
+	push	rdi
+	push	rsi
+
+	mov	rsi, JSAMPROW [rsi]			; inptr
+	mov	rbx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]	; outptr0
+	mov	rdi, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]	; outptr1
+	mov	rax,rdx					; colctr
+.columnloop:
+
+	movdqa	xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+
+	movdqa    xmm1,xmm0
+	punpcklbw xmm0,xmm0
+	punpckhbw xmm1,xmm1
+
+	movdqa	XMMWORD [rbx+0*SIZEOF_XMMWORD], xmm0
+	movdqa	XMMWORD [rbx+1*SIZEOF_XMMWORD], xmm1
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
+	movdqa	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmm1
+
+	sub	rax, byte 2*SIZEOF_XMMWORD
+	jz	short .nextrow
+
+	movdqa	xmm2, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+
+	movdqa    xmm3,xmm2
+	punpcklbw xmm2,xmm2
+	punpckhbw xmm3,xmm3
+
+	movdqa	XMMWORD [rbx+2*SIZEOF_XMMWORD], xmm2
+	movdqa	XMMWORD [rbx+3*SIZEOF_XMMWORD], xmm3
+	movdqa	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmm2
+	movdqa	XMMWORD [rdi+3*SIZEOF_XMMWORD], xmm3
+
+	sub	rax, byte 2*SIZEOF_XMMWORD
+	jz	short .nextrow
+
+	add	rsi, byte 2*SIZEOF_XMMWORD	; inptr
+	add	rbx, byte 4*SIZEOF_XMMWORD	; outptr0
+	add	rdi, byte 4*SIZEOF_XMMWORD	; outptr1
+	jmp	short .columnloop
+
+.nextrow:
+	pop	rsi
+	pop	rdi
+
+	add	rsi, byte 1*SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte 2*SIZEOF_JSAMPROW	; output_data
+	sub	rcx, byte 2			; rowctr
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbx
+	pop	rbp
+	ret
diff --git a/simd/jfss2fst-64.asm b/simd/jfss2fst-64.asm
new file mode 100644
index 0000000..9303156
--- /dev/null
+++ b/simd/jfss2fst-64.asm
@@ -0,0 +1,388 @@
+;
+; jfss2fst.asm - fast integer FDCT (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; This file contains a fast, not so accurate integer implementation of
+; the forward DCT (Discrete Cosine Transform). The following code is
+; based directly on the IJG's original jfdctfst.c; see the jfdctfst.c
+; for more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%define CONST_BITS	8	; 14 is also OK.
+
+%if CONST_BITS == 8
+F_0_382	equ	 98		; FIX(0.382683433)
+F_0_541	equ	139		; FIX(0.541196100)
+F_0_707	equ	181		; FIX(0.707106781)
+F_1_306	equ	334		; FIX(1.306562965)
+%else
+; NASM cannot do compile-time arithmetic on floating-point constants.
+%define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
+F_0_382	equ	DESCALE( 410903207,30-CONST_BITS)	; FIX(0.382683433)
+F_0_541	equ	DESCALE( 581104887,30-CONST_BITS)	; FIX(0.541196100)
+F_0_707	equ	DESCALE( 759250124,30-CONST_BITS)	; FIX(0.707106781)
+F_1_306	equ	DESCALE(1402911301,30-CONST_BITS)	; FIX(1.306562965)
+%endif
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow)
+; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw)
+
+%define PRE_MULTIPLY_SCALE_BITS   2
+%define CONST_SHIFT     (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)
+
+	alignz	16
+	global	EXTN(jconst_fdct_ifast_sse2)
+
+EXTN(jconst_fdct_ifast_sse2):
+
+PW_F0707	times 8 dw  F_0_707 << CONST_SHIFT
+PW_F0382	times 8 dw  F_0_382 << CONST_SHIFT
+PW_F0541	times 8 dw  F_0_541 << CONST_SHIFT
+PW_F1306	times 8 dw  F_1_306 << CONST_SHIFT
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Perform the forward DCT on one block of samples.
+;
+; GLOBAL(void)
+; jsimd_fdct_ifast_sse2 (DCTELEM * data)
+;
+
+; r10 = DCTELEM * data
+
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		2
+
+	align	16
+	global	EXTN(jsimd_fdct_ifast_sse2)
+
+EXTN(jsimd_fdct_ifast_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	collect_args
+
+	; ---- Pass 1: process rows.
+
+	mov	rdx, r10	; (DCTELEM *)
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm2, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_DCTELEM)]
+
+	; xmm0=(00 01 02 03 04 05 06 07), xmm2=(20 21 22 23 24 25 26 27)
+	; xmm1=(10 11 12 13 14 15 16 17), xmm3=(30 31 32 33 34 35 36 37)
+
+	movdqa    xmm4,xmm0		; transpose coefficients(phase 1)
+	punpcklwd xmm0,xmm1		; xmm0=(00 10 01 11 02 12 03 13)
+	punpckhwd xmm4,xmm1		; xmm4=(04 14 05 15 06 16 07 17)
+	movdqa    xmm5,xmm2		; transpose coefficients(phase 1)
+	punpcklwd xmm2,xmm3		; xmm2=(20 30 21 31 22 32 23 33)
+	punpckhwd xmm5,xmm3		; xmm5=(24 34 25 35 26 36 27 37)
+
+	movdqa	xmm6, XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm7, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_DCTELEM)]
+
+	; xmm6=( 4 12 20 28 36 44 52 60), xmm1=( 6 14 22 30 38 46 54 62)
+	; xmm7=( 5 13 21 29 37 45 53 61), xmm3=( 7 15 23 31 39 47 55 63)
+
+	movdqa	XMMWORD [wk(0)], xmm2	; wk(0)=(20 30 21 31 22 32 23 33)
+	movdqa	XMMWORD [wk(1)], xmm5	; wk(1)=(24 34 25 35 26 36 27 37)
+
+	movdqa    xmm2,xmm6		; transpose coefficients(phase 1)
+	punpcklwd xmm6,xmm7		; xmm6=(40 50 41 51 42 52 43 53)
+	punpckhwd xmm2,xmm7		; xmm2=(44 54 45 55 46 56 47 57)
+	movdqa    xmm5,xmm1		; transpose coefficients(phase 1)
+	punpcklwd xmm1,xmm3		; xmm1=(60 70 61 71 62 72 63 73)
+	punpckhwd xmm5,xmm3		; xmm5=(64 74 65 75 66 76 67 77)
+
+	movdqa    xmm7,xmm6		; transpose coefficients(phase 2)
+	punpckldq xmm6,xmm1		; xmm6=(40 50 60 70 41 51 61 71)
+	punpckhdq xmm7,xmm1		; xmm7=(42 52 62 72 43 53 63 73)
+	movdqa    xmm3,xmm2		; transpose coefficients(phase 2)
+	punpckldq xmm2,xmm5		; xmm2=(44 54 64 74 45 55 65 75)
+	punpckhdq xmm3,xmm5		; xmm3=(46 56 66 76 47 57 67 77)
+
+	movdqa	xmm1, XMMWORD [wk(0)]	; xmm1=(20 30 21 31 22 32 23 33)
+	movdqa	xmm5, XMMWORD [wk(1)]	; xmm5=(24 34 25 35 26 36 27 37)
+	movdqa	XMMWORD [wk(0)], xmm7	; wk(0)=(42 52 62 72 43 53 63 73)
+	movdqa	XMMWORD [wk(1)], xmm2	; wk(1)=(44 54 64 74 45 55 65 75)
+
+	movdqa    xmm7,xmm0		; transpose coefficients(phase 2)
+	punpckldq xmm0,xmm1		; xmm0=(00 10 20 30 01 11 21 31)
+	punpckhdq xmm7,xmm1		; xmm7=(02 12 22 32 03 13 23 33)
+	movdqa    xmm2,xmm4		; transpose coefficients(phase 2)
+	punpckldq xmm4,xmm5		; xmm4=(04 14 24 34 05 15 25 35)
+	punpckhdq xmm2,xmm5		; xmm2=(06 16 26 36 07 17 27 37)
+
+	movdqa     xmm1,xmm0		; transpose coefficients(phase 3)
+	punpcklqdq xmm0,xmm6		; xmm0=(00 10 20 30 40 50 60 70)=data0
+	punpckhqdq xmm1,xmm6		; xmm1=(01 11 21 31 41 51 61 71)=data1
+	movdqa     xmm5,xmm2		; transpose coefficients(phase 3)
+	punpcklqdq xmm2,xmm3		; xmm2=(06 16 26 36 46 56 66 76)=data6
+	punpckhqdq xmm5,xmm3		; xmm5=(07 17 27 37 47 57 67 77)=data7
+
+	movdqa	xmm6,xmm1
+	movdqa	xmm3,xmm0
+	psubw	xmm1,xmm2		; xmm1=data1-data6=tmp6
+	psubw	xmm0,xmm5		; xmm0=data0-data7=tmp7
+	paddw	xmm6,xmm2		; xmm6=data1+data6=tmp1
+	paddw	xmm3,xmm5		; xmm3=data0+data7=tmp0
+
+	movdqa	xmm2, XMMWORD [wk(0)]	; xmm2=(42 52 62 72 43 53 63 73)
+	movdqa	xmm5, XMMWORD [wk(1)]	; xmm5=(44 54 64 74 45 55 65 75)
+	movdqa	XMMWORD [wk(0)], xmm1	; wk(0)=tmp6
+	movdqa	XMMWORD [wk(1)], xmm0	; wk(1)=tmp7
+
+	movdqa     xmm1,xmm7		; transpose coefficients(phase 3)
+	punpcklqdq xmm7,xmm2		; xmm7=(02 12 22 32 42 52 62 72)=data2
+	punpckhqdq xmm1,xmm2		; xmm1=(03 13 23 33 43 53 63 73)=data3
+	movdqa     xmm0,xmm4		; transpose coefficients(phase 3)
+	punpcklqdq xmm4,xmm5		; xmm4=(04 14 24 34 44 54 64 74)=data4
+	punpckhqdq xmm0,xmm5		; xmm0=(05 15 25 35 45 55 65 75)=data5
+
+	movdqa	xmm2,xmm1
+	movdqa	xmm5,xmm7
+	paddw	xmm1,xmm4		; xmm1=data3+data4=tmp3
+	paddw	xmm7,xmm0		; xmm7=data2+data5=tmp2
+	psubw	xmm2,xmm4		; xmm2=data3-data4=tmp4
+	psubw	xmm5,xmm0		; xmm5=data2-data5=tmp5
+
+	; -- Even part
+
+	movdqa	xmm4,xmm3
+	movdqa	xmm0,xmm6
+	psubw	xmm3,xmm1		; xmm3=tmp13
+	psubw	xmm6,xmm7		; xmm6=tmp12
+	paddw	xmm4,xmm1		; xmm4=tmp10
+	paddw	xmm0,xmm7		; xmm0=tmp11
+
+	paddw	xmm6,xmm3
+	psllw	xmm6,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm6,[PW_F0707] ; xmm6=z1
+
+	movdqa	xmm1,xmm4
+	movdqa	xmm7,xmm3
+	psubw	xmm4,xmm0		; xmm4=data4
+	psubw	xmm3,xmm6		; xmm3=data6
+	paddw	xmm1,xmm0		; xmm1=data0
+	paddw	xmm7,xmm6		; xmm7=data2
+
+	movdqa	xmm0, XMMWORD [wk(0)]	; xmm0=tmp6
+	movdqa	xmm6, XMMWORD [wk(1)]	; xmm6=tmp7
+	movdqa	XMMWORD [wk(0)], xmm4	; wk(0)=data4
+	movdqa	XMMWORD [wk(1)], xmm3	; wk(1)=data6
+
+	; -- Odd part
+
+	paddw	xmm2,xmm5		; xmm2=tmp10
+	paddw	xmm5,xmm0		; xmm5=tmp11
+	paddw	xmm0,xmm6		; xmm0=tmp12, xmm6=tmp7
+
+	psllw	xmm2,PRE_MULTIPLY_SCALE_BITS
+	psllw	xmm0,PRE_MULTIPLY_SCALE_BITS
+
+	psllw	xmm5,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm5,[PW_F0707] ; xmm5=z3
+
+	movdqa	xmm4,xmm2		; xmm4=tmp10
+	psubw	xmm2,xmm0
+	pmulhw	xmm2,[PW_F0382] ; xmm2=z5
+	pmulhw	xmm4,[PW_F0541] ; xmm4=MULTIPLY(tmp10,FIX_0_541196)
+	pmulhw	xmm0,[PW_F1306] ; xmm0=MULTIPLY(tmp12,FIX_1_306562)
+	paddw	xmm4,xmm2		; xmm4=z2
+	paddw	xmm0,xmm2		; xmm0=z4
+
+	movdqa	xmm3,xmm6
+	psubw	xmm6,xmm5		; xmm6=z13
+	paddw	xmm3,xmm5		; xmm3=z11
+
+	movdqa	xmm2,xmm6
+	movdqa	xmm5,xmm3
+	psubw	xmm6,xmm4		; xmm6=data3
+	psubw	xmm3,xmm0		; xmm3=data7
+	paddw	xmm2,xmm4		; xmm2=data5
+	paddw	xmm5,xmm0		; xmm5=data1
+
+	; ---- Pass 2: process columns.
+
+	; xmm1=(00 10 20 30 40 50 60 70), xmm7=(02 12 22 32 42 52 62 72)
+	; xmm5=(01 11 21 31 41 51 61 71), xmm6=(03 13 23 33 43 53 63 73)
+
+	movdqa    xmm4,xmm1		; transpose coefficients(phase 1)
+	punpcklwd xmm1,xmm5		; xmm1=(00 01 10 11 20 21 30 31)
+	punpckhwd xmm4,xmm5		; xmm4=(40 41 50 51 60 61 70 71)
+	movdqa    xmm0,xmm7		; transpose coefficients(phase 1)
+	punpcklwd xmm7,xmm6		; xmm7=(02 03 12 13 22 23 32 33)
+	punpckhwd xmm0,xmm6		; xmm0=(42 43 52 53 62 63 72 73)
+
+	movdqa	xmm5, XMMWORD [wk(0)]	; xmm5=col4
+	movdqa	xmm6, XMMWORD [wk(1)]	; xmm6=col6
+
+	; xmm5=(04 14 24 34 44 54 64 74), xmm6=(06 16 26 36 46 56 66 76)
+	; xmm2=(05 15 25 35 45 55 65 75), xmm3=(07 17 27 37 47 57 67 77)
+
+	movdqa	XMMWORD [wk(0)], xmm7	; wk(0)=(02 03 12 13 22 23 32 33)
+	movdqa	XMMWORD [wk(1)], xmm0	; wk(1)=(42 43 52 53 62 63 72 73)
+
+	movdqa    xmm7,xmm5		; transpose coefficients(phase 1)
+	punpcklwd xmm5,xmm2		; xmm5=(04 05 14 15 24 25 34 35)
+	punpckhwd xmm7,xmm2		; xmm7=(44 45 54 55 64 65 74 75)
+	movdqa    xmm0,xmm6		; transpose coefficients(phase 1)
+	punpcklwd xmm6,xmm3		; xmm6=(06 07 16 17 26 27 36 37)
+	punpckhwd xmm0,xmm3		; xmm0=(46 47 56 57 66 67 76 77)
+
+	movdqa    xmm2,xmm5		; transpose coefficients(phase 2)
+	punpckldq xmm5,xmm6		; xmm5=(04 05 06 07 14 15 16 17)
+	punpckhdq xmm2,xmm6		; xmm2=(24 25 26 27 34 35 36 37)
+	movdqa    xmm3,xmm7		; transpose coefficients(phase 2)
+	punpckldq xmm7,xmm0		; xmm7=(44 45 46 47 54 55 56 57)
+	punpckhdq xmm3,xmm0		; xmm3=(64 65 66 67 74 75 76 77)
+
+	movdqa	xmm6, XMMWORD [wk(0)]	; xmm6=(02 03 12 13 22 23 32 33)
+	movdqa	xmm0, XMMWORD [wk(1)]	; xmm0=(42 43 52 53 62 63 72 73)
+	movdqa	XMMWORD [wk(0)], xmm2	; wk(0)=(24 25 26 27 34 35 36 37)
+	movdqa	XMMWORD [wk(1)], xmm7	; wk(1)=(44 45 46 47 54 55 56 57)
+
+	movdqa    xmm2,xmm1		; transpose coefficients(phase 2)
+	punpckldq xmm1,xmm6		; xmm1=(00 01 02 03 10 11 12 13)
+	punpckhdq xmm2,xmm6		; xmm2=(20 21 22 23 30 31 32 33)
+	movdqa    xmm7,xmm4		; transpose coefficients(phase 2)
+	punpckldq xmm4,xmm0		; xmm4=(40 41 42 43 50 51 52 53)
+	punpckhdq xmm7,xmm0		; xmm7=(60 61 62 63 70 71 72 73)
+
+	movdqa     xmm6,xmm1		; transpose coefficients(phase 3)
+	punpcklqdq xmm1,xmm5		; xmm1=(00 01 02 03 04 05 06 07)=data0
+	punpckhqdq xmm6,xmm5		; xmm6=(10 11 12 13 14 15 16 17)=data1
+	movdqa     xmm0,xmm7		; transpose coefficients(phase 3)
+	punpcklqdq xmm7,xmm3		; xmm7=(60 61 62 63 64 65 66 67)=data6
+	punpckhqdq xmm0,xmm3		; xmm0=(70 71 72 73 74 75 76 77)=data7
+
+	movdqa	xmm5,xmm6
+	movdqa	xmm3,xmm1
+	psubw	xmm6,xmm7		; xmm6=data1-data6=tmp6
+	psubw	xmm1,xmm0		; xmm1=data0-data7=tmp7
+	paddw	xmm5,xmm7		; xmm5=data1+data6=tmp1
+	paddw	xmm3,xmm0		; xmm3=data0+data7=tmp0
+
+	movdqa	xmm7, XMMWORD [wk(0)]	; xmm7=(24 25 26 27 34 35 36 37)
+	movdqa	xmm0, XMMWORD [wk(1)]	; xmm0=(44 45 46 47 54 55 56 57)
+	movdqa	XMMWORD [wk(0)], xmm6	; wk(0)=tmp6
+	movdqa	XMMWORD [wk(1)], xmm1	; wk(1)=tmp7
+
+	movdqa     xmm6,xmm2		; transpose coefficients(phase 3)
+	punpcklqdq xmm2,xmm7		; xmm2=(20 21 22 23 24 25 26 27)=data2
+	punpckhqdq xmm6,xmm7		; xmm6=(30 31 32 33 34 35 36 37)=data3
+	movdqa     xmm1,xmm4		; transpose coefficients(phase 3)
+	punpcklqdq xmm4,xmm0		; xmm4=(40 41 42 43 44 45 46 47)=data4
+	punpckhqdq xmm1,xmm0		; xmm1=(50 51 52 53 54 55 56 57)=data5
+
+	movdqa	xmm7,xmm6
+	movdqa	xmm0,xmm2
+	paddw	xmm6,xmm4		; xmm6=data3+data4=tmp3
+	paddw	xmm2,xmm1		; xmm2=data2+data5=tmp2
+	psubw	xmm7,xmm4		; xmm7=data3-data4=tmp4
+	psubw	xmm0,xmm1		; xmm0=data2-data5=tmp5
+
+	; -- Even part
+
+	movdqa	xmm4,xmm3
+	movdqa	xmm1,xmm5
+	psubw	xmm3,xmm6		; xmm3=tmp13
+	psubw	xmm5,xmm2		; xmm5=tmp12
+	paddw	xmm4,xmm6		; xmm4=tmp10
+	paddw	xmm1,xmm2		; xmm1=tmp11
+
+	paddw	xmm5,xmm3
+	psllw	xmm5,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm5,[PW_F0707] ; xmm5=z1
+
+	movdqa	xmm6,xmm4
+	movdqa	xmm2,xmm3
+	psubw	xmm4,xmm1		; xmm4=data4
+	psubw	xmm3,xmm5		; xmm3=data6
+	paddw	xmm6,xmm1		; xmm6=data0
+	paddw	xmm2,xmm5		; xmm2=data2
+
+	movdqa	XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_DCTELEM)], xmm4
+	movdqa	XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_DCTELEM)], xmm3
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_DCTELEM)], xmm6
+	movdqa	XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_DCTELEM)], xmm2
+
+	; -- Odd part
+
+	movdqa	xmm1, XMMWORD [wk(0)]	; xmm1=tmp6
+	movdqa	xmm5, XMMWORD [wk(1)]	; xmm5=tmp7
+
+	paddw	xmm7,xmm0		; xmm7=tmp10
+	paddw	xmm0,xmm1		; xmm0=tmp11
+	paddw	xmm1,xmm5		; xmm1=tmp12, xmm5=tmp7
+
+	psllw	xmm7,PRE_MULTIPLY_SCALE_BITS
+	psllw	xmm1,PRE_MULTIPLY_SCALE_BITS
+
+	psllw	xmm0,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm0,[PW_F0707] ; xmm0=z3
+
+	movdqa	xmm4,xmm7		; xmm4=tmp10
+	psubw	xmm7,xmm1
+	pmulhw	xmm7,[PW_F0382] ; xmm7=z5
+	pmulhw	xmm4,[PW_F0541] ; xmm4=MULTIPLY(tmp10,FIX_0_541196)
+	pmulhw	xmm1,[PW_F1306] ; xmm1=MULTIPLY(tmp12,FIX_1_306562)
+	paddw	xmm4,xmm7		; xmm4=z2
+	paddw	xmm1,xmm7		; xmm1=z4
+
+	movdqa	xmm3,xmm5
+	psubw	xmm5,xmm0		; xmm5=z13
+	paddw	xmm3,xmm0		; xmm3=z11
+
+	movdqa	xmm6,xmm5
+	movdqa	xmm2,xmm3
+	psubw	xmm5,xmm4		; xmm5=data3
+	psubw	xmm3,xmm1		; xmm3=data7
+	paddw	xmm6,xmm4		; xmm6=data5
+	paddw	xmm2,xmm1		; xmm2=data1
+
+	movdqa	XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_DCTELEM)], xmm5
+	movdqa	XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_DCTELEM)], xmm3
+	movdqa	XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_DCTELEM)], xmm6
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_DCTELEM)], xmm2
+
+	uncollect_args
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
diff --git a/simd/jfss2int-64.asm b/simd/jfss2int-64.asm
new file mode 100644
index 0000000..f787921
--- /dev/null
+++ b/simd/jfss2int-64.asm
@@ -0,0 +1,618 @@
+;
+; jfss2int.asm - accurate integer FDCT (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; This file contains a slow-but-accurate integer implementation of the
+; forward DCT (Discrete Cosine Transform). The following code is based
+; directly on the IJG's original jfdctint.c; see the jfdctint.c for
+; more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%define CONST_BITS	13
+%define PASS1_BITS	2
+
+%define DESCALE_P1	(CONST_BITS-PASS1_BITS)
+%define DESCALE_P2	(CONST_BITS+PASS1_BITS)
+
+%if CONST_BITS == 13
+F_0_298	equ	 2446		; FIX(0.298631336)
+F_0_390	equ	 3196		; FIX(0.390180644)
+F_0_541	equ	 4433		; FIX(0.541196100)
+F_0_765	equ	 6270		; FIX(0.765366865)
+F_0_899	equ	 7373		; FIX(0.899976223)
+F_1_175	equ	 9633		; FIX(1.175875602)
+F_1_501	equ	12299		; FIX(1.501321110)
+F_1_847	equ	15137		; FIX(1.847759065)
+F_1_961	equ	16069		; FIX(1.961570560)
+F_2_053	equ	16819		; FIX(2.053119869)
+F_2_562	equ	20995		; FIX(2.562915447)
+F_3_072	equ	25172		; FIX(3.072711026)
+%else
+; NASM cannot do compile-time arithmetic on floating-point constants.
+%define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
+F_0_298	equ	DESCALE( 320652955,30-CONST_BITS)	; FIX(0.298631336)
+F_0_390	equ	DESCALE( 418953276,30-CONST_BITS)	; FIX(0.390180644)
+F_0_541	equ	DESCALE( 581104887,30-CONST_BITS)	; FIX(0.541196100)
+F_0_765	equ	DESCALE( 821806413,30-CONST_BITS)	; FIX(0.765366865)
+F_0_899	equ	DESCALE( 966342111,30-CONST_BITS)	; FIX(0.899976223)
+F_1_175	equ	DESCALE(1262586813,30-CONST_BITS)	; FIX(1.175875602)
+F_1_501	equ	DESCALE(1612031267,30-CONST_BITS)	; FIX(1.501321110)
+F_1_847	equ	DESCALE(1984016188,30-CONST_BITS)	; FIX(1.847759065)
+F_1_961	equ	DESCALE(2106220350,30-CONST_BITS)	; FIX(1.961570560)
+F_2_053	equ	DESCALE(2204520673,30-CONST_BITS)	; FIX(2.053119869)
+F_2_562	equ	DESCALE(2751909506,30-CONST_BITS)	; FIX(2.562915447)
+F_3_072	equ	DESCALE(3299298341,30-CONST_BITS)	; FIX(3.072711026)
+%endif
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_fdct_islow_sse2)
+
+EXTN(jconst_fdct_islow_sse2):
+
+PW_F130_F054	times 4 dw  (F_0_541+F_0_765), F_0_541
+PW_F054_MF130	times 4 dw  F_0_541, (F_0_541-F_1_847)
+PW_MF078_F117	times 4 dw  (F_1_175-F_1_961), F_1_175
+PW_F117_F078	times 4 dw  F_1_175, (F_1_175-F_0_390)
+PW_MF060_MF089	times 4 dw  (F_0_298-F_0_899),-F_0_899
+PW_MF089_F060	times 4 dw -F_0_899, (F_1_501-F_0_899)
+PW_MF050_MF256	times 4 dw  (F_2_053-F_2_562),-F_2_562
+PW_MF256_F050	times 4 dw -F_2_562, (F_3_072-F_2_562)
+PD_DESCALE_P1	times 4 dd  1 << (DESCALE_P1-1)
+PD_DESCALE_P2	times 4 dd  1 << (DESCALE_P2-1)
+PW_DESCALE_P2X	times 8 dw  1 << (PASS1_BITS-1)
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Perform the forward DCT on one block of samples.
+;
+; GLOBAL(void)
+; jsimd_fdct_islow_sse2 (DCTELEM * data)
+;
+
+; r10 = DCTELEM * data
+
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		6
+
+	align	16
+	global	EXTN(jsimd_fdct_islow_sse2)
+
+EXTN(jsimd_fdct_islow_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	collect_args
+
+	; ---- Pass 1: process rows.
+
+	mov	rdx, r10	; (DCTELEM *)
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm2, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_DCTELEM)]
+
+	; xmm0=(00 01 02 03 04 05 06 07), xmm2=(20 21 22 23 24 25 26 27)
+	; xmm1=(10 11 12 13 14 15 16 17), xmm3=(30 31 32 33 34 35 36 37)
+
+	movdqa    xmm4,xmm0		; transpose coefficients(phase 1)
+	punpcklwd xmm0,xmm1		; xmm0=(00 10 01 11 02 12 03 13)
+	punpckhwd xmm4,xmm1		; xmm4=(04 14 05 15 06 16 07 17)
+	movdqa    xmm5,xmm2		; transpose coefficients(phase 1)
+	punpcklwd xmm2,xmm3		; xmm2=(20 30 21 31 22 32 23 33)
+	punpckhwd xmm5,xmm3		; xmm5=(24 34 25 35 26 36 27 37)
+
+	movdqa	xmm6, XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm7, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_DCTELEM)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_DCTELEM)]
+
+	; xmm6=( 4 12 20 28 36 44 52 60), xmm1=( 6 14 22 30 38 46 54 62)
+	; xmm7=( 5 13 21 29 37 45 53 61), xmm3=( 7 15 23 31 39 47 55 63)
+
+	movdqa	XMMWORD [wk(0)], xmm2	; wk(0)=(20 30 21 31 22 32 23 33)
+	movdqa	XMMWORD [wk(1)], xmm5	; wk(1)=(24 34 25 35 26 36 27 37)
+
+	movdqa    xmm2,xmm6		; transpose coefficients(phase 1)
+	punpcklwd xmm6,xmm7		; xmm6=(40 50 41 51 42 52 43 53)
+	punpckhwd xmm2,xmm7		; xmm2=(44 54 45 55 46 56 47 57)
+	movdqa    xmm5,xmm1		; transpose coefficients(phase 1)
+	punpcklwd xmm1,xmm3		; xmm1=(60 70 61 71 62 72 63 73)
+	punpckhwd xmm5,xmm3		; xmm5=(64 74 65 75 66 76 67 77)
+
+	movdqa    xmm7,xmm6		; transpose coefficients(phase 2)
+	punpckldq xmm6,xmm1		; xmm6=(40 50 60 70 41 51 61 71)
+	punpckhdq xmm7,xmm1		; xmm7=(42 52 62 72 43 53 63 73)
+	movdqa    xmm3,xmm2		; transpose coefficients(phase 2)
+	punpckldq xmm2,xmm5		; xmm2=(44 54 64 74 45 55 65 75)
+	punpckhdq xmm3,xmm5		; xmm3=(46 56 66 76 47 57 67 77)
+
+	movdqa	xmm1, XMMWORD [wk(0)]	; xmm1=(20 30 21 31 22 32 23 33)
+	movdqa	xmm5, XMMWORD [wk(1)]	; xmm5=(24 34 25 35 26 36 27 37)
+	movdqa	XMMWORD [wk(2)], xmm7	; wk(2)=(42 52 62 72 43 53 63 73)
+	movdqa	XMMWORD [wk(3)], xmm2	; wk(3)=(44 54 64 74 45 55 65 75)
+
+	movdqa    xmm7,xmm0		; transpose coefficients(phase 2)
+	punpckldq xmm0,xmm1		; xmm0=(00 10 20 30 01 11 21 31)
+	punpckhdq xmm7,xmm1		; xmm7=(02 12 22 32 03 13 23 33)
+	movdqa    xmm2,xmm4		; transpose coefficients(phase 2)
+	punpckldq xmm4,xmm5		; xmm4=(04 14 24 34 05 15 25 35)
+	punpckhdq xmm2,xmm5		; xmm2=(06 16 26 36 07 17 27 37)
+
+	movdqa     xmm1,xmm0		; transpose coefficients(phase 3)
+	punpcklqdq xmm0,xmm6		; xmm0=(00 10 20 30 40 50 60 70)=data0
+	punpckhqdq xmm1,xmm6		; xmm1=(01 11 21 31 41 51 61 71)=data1
+	movdqa     xmm5,xmm2		; transpose coefficients(phase 3)
+	punpcklqdq xmm2,xmm3		; xmm2=(06 16 26 36 46 56 66 76)=data6
+	punpckhqdq xmm5,xmm3		; xmm5=(07 17 27 37 47 57 67 77)=data7
+
+	movdqa	xmm6,xmm1
+	movdqa	xmm3,xmm0
+	psubw	xmm1,xmm2		; xmm1=data1-data6=tmp6
+	psubw	xmm0,xmm5		; xmm0=data0-data7=tmp7
+	paddw	xmm6,xmm2		; xmm6=data1+data6=tmp1
+	paddw	xmm3,xmm5		; xmm3=data0+data7=tmp0
+
+	movdqa	xmm2, XMMWORD [wk(2)]	; xmm2=(42 52 62 72 43 53 63 73)
+	movdqa	xmm5, XMMWORD [wk(3)]	; xmm5=(44 54 64 74 45 55 65 75)
+	movdqa	XMMWORD [wk(0)], xmm1	; wk(0)=tmp6
+	movdqa	XMMWORD [wk(1)], xmm0	; wk(1)=tmp7
+
+	movdqa     xmm1,xmm7		; transpose coefficients(phase 3)
+	punpcklqdq xmm7,xmm2		; xmm7=(02 12 22 32 42 52 62 72)=data2
+	punpckhqdq xmm1,xmm2		; xmm1=(03 13 23 33 43 53 63 73)=data3
+	movdqa     xmm0,xmm4		; transpose coefficients(phase 3)
+	punpcklqdq xmm4,xmm5		; xmm4=(04 14 24 34 44 54 64 74)=data4
+	punpckhqdq xmm0,xmm5		; xmm0=(05 15 25 35 45 55 65 75)=data5
+
+	movdqa	xmm2,xmm1
+	movdqa	xmm5,xmm7
+	paddw	xmm1,xmm4		; xmm1=data3+data4=tmp3
+	paddw	xmm7,xmm0		; xmm7=data2+data5=tmp2
+	psubw	xmm2,xmm4		; xmm2=data3-data4=tmp4
+	psubw	xmm5,xmm0		; xmm5=data2-data5=tmp5
+
+	; -- Even part
+
+	movdqa	xmm4,xmm3
+	movdqa	xmm0,xmm6
+	paddw	xmm3,xmm1		; xmm3=tmp10
+	paddw	xmm6,xmm7		; xmm6=tmp11
+	psubw	xmm4,xmm1		; xmm4=tmp13
+	psubw	xmm0,xmm7		; xmm0=tmp12
+
+	movdqa	xmm1,xmm3
+	paddw	xmm3,xmm6		; xmm3=tmp10+tmp11
+	psubw	xmm1,xmm6		; xmm1=tmp10-tmp11
+
+	psllw	xmm3,PASS1_BITS		; xmm3=data0
+	psllw	xmm1,PASS1_BITS		; xmm1=data4
+
+	movdqa	XMMWORD [wk(2)], xmm3	; wk(2)=data0
+	movdqa	XMMWORD [wk(3)], xmm1	; wk(3)=data4
+
+	; (Original)
+	; z1 = (tmp12 + tmp13) * 0.541196100;
+	; data2 = z1 + tmp13 * 0.765366865;
+	; data6 = z1 + tmp12 * -1.847759065;
+	;
+	; (This implementation)
+	; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100;
+	; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065);
+
+	movdqa    xmm7,xmm4		; xmm4=tmp13
+	movdqa    xmm6,xmm4
+	punpcklwd xmm7,xmm0		; xmm0=tmp12
+	punpckhwd xmm6,xmm0
+	movdqa    xmm4,xmm7
+	movdqa    xmm0,xmm6
+	pmaddwd   xmm7,[PW_F130_F054]	; xmm7=data2L
+	pmaddwd   xmm6,[PW_F130_F054]	; xmm6=data2H
+	pmaddwd   xmm4,[PW_F054_MF130]	; xmm4=data6L
+	pmaddwd   xmm0,[PW_F054_MF130]	; xmm0=data6H
+
+	paddd	xmm7,[PD_DESCALE_P1]
+	paddd	xmm6,[PD_DESCALE_P1]
+	psrad	xmm7,DESCALE_P1
+	psrad	xmm6,DESCALE_P1
+	paddd	xmm4,[PD_DESCALE_P1]
+	paddd	xmm0,[PD_DESCALE_P1]
+	psrad	xmm4,DESCALE_P1
+	psrad	xmm0,DESCALE_P1
+
+	packssdw  xmm7,xmm6		; xmm7=data2
+	packssdw  xmm4,xmm0		; xmm4=data6
+
+	movdqa	XMMWORD [wk(4)], xmm7	; wk(4)=data2
+	movdqa	XMMWORD [wk(5)], xmm4	; wk(5)=data6
+
+	; -- Odd part
+
+	movdqa	xmm3, XMMWORD [wk(0)]	; xmm3=tmp6
+	movdqa	xmm1, XMMWORD [wk(1)]	; xmm1=tmp7
+
+	movdqa	xmm6,xmm2		; xmm2=tmp4
+	movdqa	xmm0,xmm5		; xmm5=tmp5
+	paddw	xmm6,xmm3		; xmm6=z3
+	paddw	xmm0,xmm1		; xmm0=z4
+
+	; (Original)
+	; z5 = (z3 + z4) * 1.175875602;
+	; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
+	; z3 += z5;  z4 += z5;
+	;
+	; (This implementation)
+	; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
+	; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
+
+	movdqa    xmm7,xmm6
+	movdqa    xmm4,xmm6
+	punpcklwd xmm7,xmm0
+	punpckhwd xmm4,xmm0
+	movdqa    xmm6,xmm7
+	movdqa    xmm0,xmm4
+	pmaddwd   xmm7,[PW_MF078_F117]	; xmm7=z3L
+	pmaddwd   xmm4,[PW_MF078_F117]	; xmm4=z3H
+	pmaddwd   xmm6,[PW_F117_F078]	; xmm6=z4L
+	pmaddwd   xmm0,[PW_F117_F078]	; xmm0=z4H
+
+	movdqa	XMMWORD [wk(0)], xmm7	; wk(0)=z3L
+	movdqa	XMMWORD [wk(1)], xmm4	; wk(1)=z3H
+
+	; (Original)
+	; z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6;
+	; tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869;
+	; tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110;
+	; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
+	; data7 = tmp4 + z1 + z3;  data5 = tmp5 + z2 + z4;
+	; data3 = tmp6 + z2 + z3;  data1 = tmp7 + z1 + z4;
+	;
+	; (This implementation)
+	; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223;
+	; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447;
+	; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447);
+	; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223);
+	; data7 = tmp4 + z3;  data5 = tmp5 + z4;
+	; data3 = tmp6 + z3;  data1 = tmp7 + z4;
+
+	movdqa    xmm7,xmm2
+	movdqa    xmm4,xmm2
+	punpcklwd xmm7,xmm1
+	punpckhwd xmm4,xmm1
+	movdqa    xmm2,xmm7
+	movdqa    xmm1,xmm4
+	pmaddwd   xmm7,[PW_MF060_MF089]	; xmm7=tmp4L
+	pmaddwd   xmm4,[PW_MF060_MF089]	; xmm4=tmp4H
+	pmaddwd   xmm2,[PW_MF089_F060]	; xmm2=tmp7L
+	pmaddwd   xmm1,[PW_MF089_F060]	; xmm1=tmp7H
+
+	paddd	xmm7, XMMWORD [wk(0)]	; xmm7=data7L
+	paddd	xmm4, XMMWORD [wk(1)]	; xmm4=data7H
+	paddd	xmm2,xmm6		; xmm2=data1L
+	paddd	xmm1,xmm0		; xmm1=data1H
+
+	paddd	xmm7,[PD_DESCALE_P1]
+	paddd	xmm4,[PD_DESCALE_P1]
+	psrad	xmm7,DESCALE_P1
+	psrad	xmm4,DESCALE_P1
+	paddd	xmm2,[PD_DESCALE_P1]
+	paddd	xmm1,[PD_DESCALE_P1]
+	psrad	xmm2,DESCALE_P1
+	psrad	xmm1,DESCALE_P1
+
+	packssdw  xmm7,xmm4		; xmm7=data7
+	packssdw  xmm2,xmm1		; xmm2=data1
+
+	movdqa    xmm4,xmm5
+	movdqa    xmm1,xmm5
+	punpcklwd xmm4,xmm3
+	punpckhwd xmm1,xmm3
+	movdqa    xmm5,xmm4
+	movdqa    xmm3,xmm1
+	pmaddwd   xmm4,[PW_MF050_MF256]	; xmm4=tmp5L
+	pmaddwd   xmm1,[PW_MF050_MF256]	; xmm1=tmp5H
+	pmaddwd   xmm5,[PW_MF256_F050]	; xmm5=tmp6L
+	pmaddwd   xmm3,[PW_MF256_F050]	; xmm3=tmp6H
+
+	paddd	xmm4,xmm6		; xmm4=data5L
+	paddd	xmm1,xmm0		; xmm1=data5H
+	paddd	xmm5, XMMWORD [wk(0)]	; xmm5=data3L
+	paddd	xmm3, XMMWORD [wk(1)]	; xmm3=data3H
+
+	paddd	xmm4,[PD_DESCALE_P1]
+	paddd	xmm1,[PD_DESCALE_P1]
+	psrad	xmm4,DESCALE_P1
+	psrad	xmm1,DESCALE_P1
+	paddd	xmm5,[PD_DESCALE_P1]
+	paddd	xmm3,[PD_DESCALE_P1]
+	psrad	xmm5,DESCALE_P1
+	psrad	xmm3,DESCALE_P1
+
+	packssdw  xmm4,xmm1		; xmm4=data5
+	packssdw  xmm5,xmm3		; xmm5=data3
+
+	; ---- Pass 2: process columns.
+
+	movdqa	xmm6, XMMWORD [wk(2)]	; xmm6=col0
+	movdqa	xmm0, XMMWORD [wk(4)]	; xmm0=col2
+
+	; xmm6=(00 10 20 30 40 50 60 70), xmm0=(02 12 22 32 42 52 62 72)
+	; xmm2=(01 11 21 31 41 51 61 71), xmm5=(03 13 23 33 43 53 63 73)
+
+	movdqa    xmm1,xmm6		; transpose coefficients(phase 1)
+	punpcklwd xmm6,xmm2		; xmm6=(00 01 10 11 20 21 30 31)
+	punpckhwd xmm1,xmm2		; xmm1=(40 41 50 51 60 61 70 71)
+	movdqa    xmm3,xmm0		; transpose coefficients(phase 1)
+	punpcklwd xmm0,xmm5		; xmm0=(02 03 12 13 22 23 32 33)
+	punpckhwd xmm3,xmm5		; xmm3=(42 43 52 53 62 63 72 73)
+
+	movdqa	xmm2, XMMWORD [wk(3)]	; xmm2=col4
+	movdqa	xmm5, XMMWORD [wk(5)]	; xmm5=col6
+
+	; xmm2=(04 14 24 34 44 54 64 74), xmm5=(06 16 26 36 46 56 66 76)
+	; xmm4=(05 15 25 35 45 55 65 75), xmm7=(07 17 27 37 47 57 67 77)
+
+	movdqa	XMMWORD [wk(0)], xmm0	; wk(0)=(02 03 12 13 22 23 32 33)
+	movdqa	XMMWORD [wk(1)], xmm3	; wk(1)=(42 43 52 53 62 63 72 73)
+
+	movdqa    xmm0,xmm2		; transpose coefficients(phase 1)
+	punpcklwd xmm2,xmm4		; xmm2=(04 05 14 15 24 25 34 35)
+	punpckhwd xmm0,xmm4		; xmm0=(44 45 54 55 64 65 74 75)
+	movdqa    xmm3,xmm5		; transpose coefficients(phase 1)
+	punpcklwd xmm5,xmm7		; xmm5=(06 07 16 17 26 27 36 37)
+	punpckhwd xmm3,xmm7		; xmm3=(46 47 56 57 66 67 76 77)
+
+	movdqa    xmm4,xmm2		; transpose coefficients(phase 2)
+	punpckldq xmm2,xmm5		; xmm2=(04 05 06 07 14 15 16 17)
+	punpckhdq xmm4,xmm5		; xmm4=(24 25 26 27 34 35 36 37)
+	movdqa    xmm7,xmm0		; transpose coefficients(phase 2)
+	punpckldq xmm0,xmm3		; xmm0=(44 45 46 47 54 55 56 57)
+	punpckhdq xmm7,xmm3		; xmm7=(64 65 66 67 74 75 76 77)
+
+	movdqa	xmm5, XMMWORD [wk(0)]	; xmm5=(02 03 12 13 22 23 32 33)
+	movdqa	xmm3, XMMWORD [wk(1)]	; xmm3=(42 43 52 53 62 63 72 73)
+	movdqa	XMMWORD [wk(2)], xmm4	; wk(2)=(24 25 26 27 34 35 36 37)
+	movdqa	XMMWORD [wk(3)], xmm0	; wk(3)=(44 45 46 47 54 55 56 57)
+
+	movdqa    xmm4,xmm6		; transpose coefficients(phase 2)
+	punpckldq xmm6,xmm5		; xmm6=(00 01 02 03 10 11 12 13)
+	punpckhdq xmm4,xmm5		; xmm4=(20 21 22 23 30 31 32 33)
+	movdqa    xmm0,xmm1		; transpose coefficients(phase 2)
+	punpckldq xmm1,xmm3		; xmm1=(40 41 42 43 50 51 52 53)
+	punpckhdq xmm0,xmm3		; xmm0=(60 61 62 63 70 71 72 73)
+
+	movdqa     xmm5,xmm6		; transpose coefficients(phase 3)
+	punpcklqdq xmm6,xmm2		; xmm6=(00 01 02 03 04 05 06 07)=data0
+	punpckhqdq xmm5,xmm2		; xmm5=(10 11 12 13 14 15 16 17)=data1
+	movdqa     xmm3,xmm0		; transpose coefficients(phase 3)
+	punpcklqdq xmm0,xmm7		; xmm0=(60 61 62 63 64 65 66 67)=data6
+	punpckhqdq xmm3,xmm7		; xmm3=(70 71 72 73 74 75 76 77)=data7
+
+	movdqa	xmm2,xmm5
+	movdqa	xmm7,xmm6
+	psubw	xmm5,xmm0		; xmm5=data1-data6=tmp6
+	psubw	xmm6,xmm3		; xmm6=data0-data7=tmp7
+	paddw	xmm2,xmm0		; xmm2=data1+data6=tmp1
+	paddw	xmm7,xmm3		; xmm7=data0+data7=tmp0
+
+	movdqa	xmm0, XMMWORD [wk(2)]	; xmm0=(24 25 26 27 34 35 36 37)
+	movdqa	xmm3, XMMWORD [wk(3)]	; xmm3=(44 45 46 47 54 55 56 57)
+	movdqa	XMMWORD [wk(0)], xmm5	; wk(0)=tmp6
+	movdqa	XMMWORD [wk(1)], xmm6	; wk(1)=tmp7
+
+	movdqa     xmm5,xmm4		; transpose coefficients(phase 3)
+	punpcklqdq xmm4,xmm0		; xmm4=(20 21 22 23 24 25 26 27)=data2
+	punpckhqdq xmm5,xmm0		; xmm5=(30 31 32 33 34 35 36 37)=data3
+	movdqa     xmm6,xmm1		; transpose coefficients(phase 3)
+	punpcklqdq xmm1,xmm3		; xmm1=(40 41 42 43 44 45 46 47)=data4
+	punpckhqdq xmm6,xmm3		; xmm6=(50 51 52 53 54 55 56 57)=data5
+
+	movdqa	xmm0,xmm5
+	movdqa	xmm3,xmm4
+	paddw	xmm5,xmm1		; xmm5=data3+data4=tmp3
+	paddw	xmm4,xmm6		; xmm4=data2+data5=tmp2
+	psubw	xmm0,xmm1		; xmm0=data3-data4=tmp4
+	psubw	xmm3,xmm6		; xmm3=data2-data5=tmp5
+
+	; -- Even part
+
+	movdqa	xmm1,xmm7
+	movdqa	xmm6,xmm2
+	paddw	xmm7,xmm5		; xmm7=tmp10
+	paddw	xmm2,xmm4		; xmm2=tmp11
+	psubw	xmm1,xmm5		; xmm1=tmp13
+	psubw	xmm6,xmm4		; xmm6=tmp12
+
+	movdqa	xmm5,xmm7
+	paddw	xmm7,xmm2		; xmm7=tmp10+tmp11
+	psubw	xmm5,xmm2		; xmm5=tmp10-tmp11
+
+	paddw	xmm7,[PW_DESCALE_P2X]
+	paddw	xmm5,[PW_DESCALE_P2X]
+	psraw	xmm7,PASS1_BITS		; xmm7=data0
+	psraw	xmm5,PASS1_BITS		; xmm5=data4
+
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_DCTELEM)], xmm7
+	movdqa	XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_DCTELEM)], xmm5
+
+	; (Original)
+	; z1 = (tmp12 + tmp13) * 0.541196100;
+	; data2 = z1 + tmp13 * 0.765366865;
+	; data6 = z1 + tmp12 * -1.847759065;
+	;
+	; (This implementation)
+	; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100;
+	; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065);
+
+	movdqa    xmm4,xmm1		; xmm1=tmp13
+	movdqa    xmm2,xmm1
+	punpcklwd xmm4,xmm6		; xmm6=tmp12
+	punpckhwd xmm2,xmm6
+	movdqa    xmm1,xmm4
+	movdqa    xmm6,xmm2
+	pmaddwd   xmm4,[PW_F130_F054]	; xmm4=data2L
+	pmaddwd   xmm2,[PW_F130_F054]	; xmm2=data2H
+	pmaddwd   xmm1,[PW_F054_MF130]	; xmm1=data6L
+	pmaddwd   xmm6,[PW_F054_MF130]	; xmm6=data6H
+
+	paddd	xmm4,[PD_DESCALE_P2]
+	paddd	xmm2,[PD_DESCALE_P2]
+	psrad	xmm4,DESCALE_P2
+	psrad	xmm2,DESCALE_P2
+	paddd	xmm1,[PD_DESCALE_P2]
+	paddd	xmm6,[PD_DESCALE_P2]
+	psrad	xmm1,DESCALE_P2
+	psrad	xmm6,DESCALE_P2
+
+	packssdw  xmm4,xmm2		; xmm4=data2
+	packssdw  xmm1,xmm6		; xmm1=data6
+
+	movdqa	XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_DCTELEM)], xmm4
+	movdqa	XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_DCTELEM)], xmm1
+
+	; -- Odd part
+
+	movdqa	xmm7, XMMWORD [wk(0)]	; xmm7=tmp6
+	movdqa	xmm5, XMMWORD [wk(1)]	; xmm5=tmp7
+
+	movdqa	xmm2,xmm0		; xmm0=tmp4
+	movdqa	xmm6,xmm3		; xmm3=tmp5
+	paddw	xmm2,xmm7		; xmm2=z3
+	paddw	xmm6,xmm5		; xmm6=z4
+
+	; (Original)
+	; z5 = (z3 + z4) * 1.175875602;
+	; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
+	; z3 += z5;  z4 += z5;
+	;
+	; (This implementation)
+	; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
+	; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
+
+	movdqa    xmm4,xmm2
+	movdqa    xmm1,xmm2
+	punpcklwd xmm4,xmm6
+	punpckhwd xmm1,xmm6
+	movdqa    xmm2,xmm4
+	movdqa    xmm6,xmm1
+	pmaddwd   xmm4,[PW_MF078_F117]	; xmm4=z3L
+	pmaddwd   xmm1,[PW_MF078_F117]	; xmm1=z3H
+	pmaddwd   xmm2,[PW_F117_F078]	; xmm2=z4L
+	pmaddwd   xmm6,[PW_F117_F078]	; xmm6=z4H
+
+	movdqa	XMMWORD [wk(0)], xmm4	; wk(0)=z3L
+	movdqa	XMMWORD [wk(1)], xmm1	; wk(1)=z3H
+
+	; (Original)
+	; z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6;
+	; tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869;
+	; tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110;
+	; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
+	; data7 = tmp4 + z1 + z3;  data5 = tmp5 + z2 + z4;
+	; data3 = tmp6 + z2 + z3;  data1 = tmp7 + z1 + z4;
+	;
+	; (This implementation)
+	; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223;
+	; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447;
+	; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447);
+	; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223);
+	; data7 = tmp4 + z3;  data5 = tmp5 + z4;
+	; data3 = tmp6 + z3;  data1 = tmp7 + z4;
+
+	movdqa    xmm4,xmm0
+	movdqa    xmm1,xmm0
+	punpcklwd xmm4,xmm5
+	punpckhwd xmm1,xmm5
+	movdqa    xmm0,xmm4
+	movdqa    xmm5,xmm1
+	pmaddwd   xmm4,[PW_MF060_MF089]	; xmm4=tmp4L
+	pmaddwd   xmm1,[PW_MF060_MF089]	; xmm1=tmp4H
+	pmaddwd   xmm0,[PW_MF089_F060]	; xmm0=tmp7L
+	pmaddwd   xmm5,[PW_MF089_F060]	; xmm5=tmp7H
+
+	paddd	xmm4, XMMWORD [wk(0)]	; xmm4=data7L
+	paddd	xmm1, XMMWORD [wk(1)]	; xmm1=data7H
+	paddd	xmm0,xmm2		; xmm0=data1L
+	paddd	xmm5,xmm6		; xmm5=data1H
+
+	paddd	xmm4,[PD_DESCALE_P2]
+	paddd	xmm1,[PD_DESCALE_P2]
+	psrad	xmm4,DESCALE_P2
+	psrad	xmm1,DESCALE_P2
+	paddd	xmm0,[PD_DESCALE_P2]
+	paddd	xmm5,[PD_DESCALE_P2]
+	psrad	xmm0,DESCALE_P2
+	psrad	xmm5,DESCALE_P2
+
+	packssdw  xmm4,xmm1		; xmm4=data7
+	packssdw  xmm0,xmm5		; xmm0=data1
+
+	movdqa	XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_DCTELEM)], xmm4
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_DCTELEM)], xmm0
+
+	movdqa    xmm1,xmm3
+	movdqa    xmm5,xmm3
+	punpcklwd xmm1,xmm7
+	punpckhwd xmm5,xmm7
+	movdqa    xmm3,xmm1
+	movdqa    xmm7,xmm5
+	pmaddwd   xmm1,[PW_MF050_MF256]	; xmm1=tmp5L
+	pmaddwd   xmm5,[PW_MF050_MF256]	; xmm5=tmp5H
+	pmaddwd   xmm3,[PW_MF256_F050]	; xmm3=tmp6L
+	pmaddwd   xmm7,[PW_MF256_F050]	; xmm7=tmp6H
+
+	paddd	xmm1,xmm2		; xmm1=data5L
+	paddd	xmm5,xmm6		; xmm5=data5H
+	paddd	xmm3, XMMWORD [wk(0)]	; xmm3=data3L
+	paddd	xmm7, XMMWORD [wk(1)]	; xmm7=data3H
+
+	paddd	xmm1,[PD_DESCALE_P2]
+	paddd	xmm5,[PD_DESCALE_P2]
+	psrad	xmm1,DESCALE_P2
+	psrad	xmm5,DESCALE_P2
+	paddd	xmm3,[PD_DESCALE_P2]
+	paddd	xmm7,[PD_DESCALE_P2]
+	psrad	xmm3,DESCALE_P2
+	psrad	xmm7,DESCALE_P2
+
+	packssdw  xmm1,xmm5		; xmm1=data5
+	packssdw  xmm3,xmm7		; xmm3=data3
+
+	movdqa	XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_DCTELEM)], xmm1
+	movdqa	XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_DCTELEM)], xmm3
+
+	uncollect_args
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
diff --git a/simd/jfsseflt-64.asm b/simd/jfsseflt-64.asm
new file mode 100644
index 0000000..d8f7246
--- /dev/null
+++ b/simd/jfsseflt-64.asm
@@ -0,0 +1,354 @@
+;
+; jfsseflt.asm - floating-point FDCT (64-bit SSE)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; This file contains a floating-point implementation of the forward DCT
+; (Discrete Cosine Transform). The following code is based directly on
+; the IJG's original jfdctflt.c; see the jfdctflt.c for more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%macro	unpcklps2 2	; %1=(0 1 2 3) / %2=(4 5 6 7) => %1=(0 1 4 5)
+	shufps	%1,%2,0x44
+%endmacro
+
+%macro	unpckhps2 2	; %1=(0 1 2 3) / %2=(4 5 6 7) => %1=(2 3 6 7)
+	shufps	%1,%2,0xEE
+%endmacro
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_fdct_float_sse)
+
+EXTN(jconst_fdct_float_sse):
+
+PD_0_382	times 4 dd  0.382683432365089771728460
+PD_0_707	times 4 dd  0.707106781186547524400844
+PD_0_541	times 4 dd  0.541196100146196984399723
+PD_1_306	times 4 dd  1.306562964876376527856643
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Perform the forward DCT on one block of samples.
+;
+; GLOBAL(void)
+; jsimd_fdct_float_sse (FAST_FLOAT * data)
+;
+
+; r10 = FAST_FLOAT * data
+
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		2
+
+	align	16
+	global	EXTN(jsimd_fdct_float_sse)
+
+EXTN(jsimd_fdct_float_sse):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	collect_args
+
+	; ---- Pass 1: process rows.
+
+	mov	rdx, r10	; (FAST_FLOAT *)
+	mov	rcx, DCTSIZE/4
+.rowloop:
+
+	movaps	xmm0, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm2, XMMWORD [XMMBLOCK(2,1,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(3,1,rdx,SIZEOF_FAST_FLOAT)]
+
+	; xmm0=(20 21 22 23), xmm2=(24 25 26 27)
+	; xmm1=(30 31 32 33), xmm3=(34 35 36 37)
+
+	movaps   xmm4,xmm0		; transpose coefficients(phase 1)
+	unpcklps xmm0,xmm1		; xmm0=(20 30 21 31)
+	unpckhps xmm4,xmm1		; xmm4=(22 32 23 33)
+	movaps   xmm5,xmm2		; transpose coefficients(phase 1)
+	unpcklps xmm2,xmm3		; xmm2=(24 34 25 35)
+	unpckhps xmm5,xmm3		; xmm5=(26 36 27 37)
+
+	movaps	xmm6, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm7, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(0,1,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(1,1,rdx,SIZEOF_FAST_FLOAT)]
+
+	; xmm6=(00 01 02 03), xmm1=(04 05 06 07)
+	; xmm7=(10 11 12 13), xmm3=(14 15 16 17)
+
+	movaps	XMMWORD [wk(0)], xmm4	; wk(0)=(22 32 23 33)
+	movaps	XMMWORD [wk(1)], xmm2	; wk(1)=(24 34 25 35)
+
+	movaps   xmm4,xmm6		; transpose coefficients(phase 1)
+	unpcklps xmm6,xmm7		; xmm6=(00 10 01 11)
+	unpckhps xmm4,xmm7		; xmm4=(02 12 03 13)
+	movaps   xmm2,xmm1		; transpose coefficients(phase 1)
+	unpcklps xmm1,xmm3		; xmm1=(04 14 05 15)
+	unpckhps xmm2,xmm3		; xmm2=(06 16 07 17)
+
+	movaps    xmm7,xmm6		; transpose coefficients(phase 2)
+	unpcklps2 xmm6,xmm0		; xmm6=(00 10 20 30)=data0
+	unpckhps2 xmm7,xmm0		; xmm7=(01 11 21 31)=data1
+	movaps    xmm3,xmm2		; transpose coefficients(phase 2)
+	unpcklps2 xmm2,xmm5		; xmm2=(06 16 26 36)=data6
+	unpckhps2 xmm3,xmm5		; xmm3=(07 17 27 37)=data7
+
+	movaps	xmm0,xmm7
+	movaps	xmm5,xmm6
+	subps	xmm7,xmm2		; xmm7=data1-data6=tmp6
+	subps	xmm6,xmm3		; xmm6=data0-data7=tmp7
+	addps	xmm0,xmm2		; xmm0=data1+data6=tmp1
+	addps	xmm5,xmm3		; xmm5=data0+data7=tmp0
+
+	movaps	xmm2, XMMWORD [wk(0)]	; xmm2=(22 32 23 33)
+	movaps	xmm3, XMMWORD [wk(1)]	; xmm3=(24 34 25 35)
+	movaps	XMMWORD [wk(0)], xmm7	; wk(0)=tmp6
+	movaps	XMMWORD [wk(1)], xmm6	; wk(1)=tmp7
+
+	movaps    xmm7,xmm4		; transpose coefficients(phase 2)
+	unpcklps2 xmm4,xmm2		; xmm4=(02 12 22 32)=data2
+	unpckhps2 xmm7,xmm2		; xmm7=(03 13 23 33)=data3
+	movaps    xmm6,xmm1		; transpose coefficients(phase 2)
+	unpcklps2 xmm1,xmm3		; xmm1=(04 14 24 34)=data4
+	unpckhps2 xmm6,xmm3		; xmm6=(05 15 25 35)=data5
+
+	movaps	xmm2,xmm7
+	movaps	xmm3,xmm4
+	addps	xmm7,xmm1		; xmm7=data3+data4=tmp3
+	addps	xmm4,xmm6		; xmm4=data2+data5=tmp2
+	subps	xmm2,xmm1		; xmm2=data3-data4=tmp4
+	subps	xmm3,xmm6		; xmm3=data2-data5=tmp5
+
+	; -- Even part
+
+	movaps	xmm1,xmm5
+	movaps	xmm6,xmm0
+	subps	xmm5,xmm7		; xmm5=tmp13
+	subps	xmm0,xmm4		; xmm0=tmp12
+	addps	xmm1,xmm7		; xmm1=tmp10
+	addps	xmm6,xmm4		; xmm6=tmp11
+
+	addps	xmm0,xmm5
+	mulps	xmm0,[PD_0_707] ; xmm0=z1
+
+	movaps	xmm7,xmm1
+	movaps	xmm4,xmm5
+	subps	xmm1,xmm6		; xmm1=data4
+	subps	xmm5,xmm0		; xmm5=data6
+	addps	xmm7,xmm6		; xmm7=data0
+	addps	xmm4,xmm0		; xmm4=data2
+
+	movaps	XMMWORD [XMMBLOCK(0,1,rdx,SIZEOF_FAST_FLOAT)], xmm1
+	movaps	XMMWORD [XMMBLOCK(2,1,rdx,SIZEOF_FAST_FLOAT)], xmm5
+	movaps	XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FAST_FLOAT)], xmm7
+	movaps	XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_FAST_FLOAT)], xmm4
+
+	; -- Odd part
+
+	movaps	xmm6, XMMWORD [wk(0)]	; xmm6=tmp6
+	movaps	xmm0, XMMWORD [wk(1)]	; xmm0=tmp7
+
+	addps	xmm2,xmm3		; xmm2=tmp10
+	addps	xmm3,xmm6		; xmm3=tmp11
+	addps	xmm6,xmm0		; xmm6=tmp12, xmm0=tmp7
+
+	mulps	xmm3,[PD_0_707] ; xmm3=z3
+
+	movaps	xmm1,xmm2		; xmm1=tmp10
+	subps	xmm2,xmm6
+	mulps	xmm2,[PD_0_382] ; xmm2=z5
+	mulps	xmm1,[PD_0_541] ; xmm1=MULTIPLY(tmp10,FIX_0_541196)
+	mulps	xmm6,[PD_1_306] ; xmm6=MULTIPLY(tmp12,FIX_1_306562)
+	addps	xmm1,xmm2		; xmm1=z2
+	addps	xmm6,xmm2		; xmm6=z4
+
+	movaps	xmm5,xmm0
+	subps	xmm0,xmm3		; xmm0=z13
+	addps	xmm5,xmm3		; xmm5=z11
+
+	movaps	xmm7,xmm0
+	movaps	xmm4,xmm5
+	subps	xmm0,xmm1		; xmm0=data3
+	subps	xmm5,xmm6		; xmm5=data7
+	addps	xmm7,xmm1		; xmm7=data5
+	addps	xmm4,xmm6		; xmm4=data1
+
+	movaps	XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_FAST_FLOAT)], xmm0
+	movaps	XMMWORD [XMMBLOCK(3,1,rdx,SIZEOF_FAST_FLOAT)], xmm5
+	movaps	XMMWORD [XMMBLOCK(1,1,rdx,SIZEOF_FAST_FLOAT)], xmm7
+	movaps	XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FAST_FLOAT)], xmm4
+
+	add	rdx, 4*DCTSIZE*SIZEOF_FAST_FLOAT
+	dec	rcx
+	jnz	near .rowloop
+
+	; ---- Pass 2: process columns.
+
+	mov	rdx, r10	; (FAST_FLOAT *)
+	mov	rcx, DCTSIZE/4
+.columnloop:
+
+	movaps	xmm0, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm2, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_FAST_FLOAT)]
+
+	; xmm0=(02 12 22 32), xmm2=(42 52 62 72)
+	; xmm1=(03 13 23 33), xmm3=(43 53 63 73)
+
+	movaps   xmm4,xmm0		; transpose coefficients(phase 1)
+	unpcklps xmm0,xmm1		; xmm0=(02 03 12 13)
+	unpckhps xmm4,xmm1		; xmm4=(22 23 32 33)
+	movaps   xmm5,xmm2		; transpose coefficients(phase 1)
+	unpcklps xmm2,xmm3		; xmm2=(42 43 52 53)
+	unpckhps xmm5,xmm3		; xmm5=(62 63 72 73)
+
+	movaps	xmm6, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm7, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_FAST_FLOAT)]
+
+	; xmm6=(00 10 20 30), xmm1=(40 50 60 70)
+	; xmm7=(01 11 21 31), xmm3=(41 51 61 71)
+
+	movaps	XMMWORD [wk(0)], xmm4	; wk(0)=(22 23 32 33)
+	movaps	XMMWORD [wk(1)], xmm2	; wk(1)=(42 43 52 53)
+
+	movaps   xmm4,xmm6		; transpose coefficients(phase 1)
+	unpcklps xmm6,xmm7		; xmm6=(00 01 10 11)
+	unpckhps xmm4,xmm7		; xmm4=(20 21 30 31)
+	movaps   xmm2,xmm1		; transpose coefficients(phase 1)
+	unpcklps xmm1,xmm3		; xmm1=(40 41 50 51)
+	unpckhps xmm2,xmm3		; xmm2=(60 61 70 71)
+
+	movaps    xmm7,xmm6		; transpose coefficients(phase 2)
+	unpcklps2 xmm6,xmm0		; xmm6=(00 01 02 03)=data0
+	unpckhps2 xmm7,xmm0		; xmm7=(10 11 12 13)=data1
+	movaps    xmm3,xmm2		; transpose coefficients(phase 2)
+	unpcklps2 xmm2,xmm5		; xmm2=(60 61 62 63)=data6
+	unpckhps2 xmm3,xmm5		; xmm3=(70 71 72 73)=data7
+
+	movaps	xmm0,xmm7
+	movaps	xmm5,xmm6
+	subps	xmm7,xmm2		; xmm7=data1-data6=tmp6
+	subps	xmm6,xmm3		; xmm6=data0-data7=tmp7
+	addps	xmm0,xmm2		; xmm0=data1+data6=tmp1
+	addps	xmm5,xmm3		; xmm5=data0+data7=tmp0
+
+	movaps	xmm2, XMMWORD [wk(0)]	; xmm2=(22 23 32 33)
+	movaps	xmm3, XMMWORD [wk(1)]	; xmm3=(42 43 52 53)
+	movaps	XMMWORD [wk(0)], xmm7	; wk(0)=tmp6
+	movaps	XMMWORD [wk(1)], xmm6	; wk(1)=tmp7
+
+	movaps    xmm7,xmm4		; transpose coefficients(phase 2)
+	unpcklps2 xmm4,xmm2		; xmm4=(20 21 22 23)=data2
+	unpckhps2 xmm7,xmm2		; xmm7=(30 31 32 33)=data3
+	movaps    xmm6,xmm1		; transpose coefficients(phase 2)
+	unpcklps2 xmm1,xmm3		; xmm1=(40 41 42 43)=data4
+	unpckhps2 xmm6,xmm3		; xmm6=(50 51 52 53)=data5
+
+	movaps	xmm2,xmm7
+	movaps	xmm3,xmm4
+	addps	xmm7,xmm1		; xmm7=data3+data4=tmp3
+	addps	xmm4,xmm6		; xmm4=data2+data5=tmp2
+	subps	xmm2,xmm1		; xmm2=data3-data4=tmp4
+	subps	xmm3,xmm6		; xmm3=data2-data5=tmp5
+
+	; -- Even part
+
+	movaps	xmm1,xmm5
+	movaps	xmm6,xmm0
+	subps	xmm5,xmm7		; xmm5=tmp13
+	subps	xmm0,xmm4		; xmm0=tmp12
+	addps	xmm1,xmm7		; xmm1=tmp10
+	addps	xmm6,xmm4		; xmm6=tmp11
+
+	addps	xmm0,xmm5
+	mulps	xmm0,[PD_0_707] ; xmm0=z1
+
+	movaps	xmm7,xmm1
+	movaps	xmm4,xmm5
+	subps	xmm1,xmm6		; xmm1=data4
+	subps	xmm5,xmm0		; xmm5=data6
+	addps	xmm7,xmm6		; xmm7=data0
+	addps	xmm4,xmm0		; xmm4=data2
+
+	movaps	XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_FAST_FLOAT)], xmm1
+	movaps	XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_FAST_FLOAT)], xmm5
+	movaps	XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FAST_FLOAT)], xmm7
+	movaps	XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_FAST_FLOAT)], xmm4
+
+	; -- Odd part
+
+	movaps	xmm6, XMMWORD [wk(0)]	; xmm6=tmp6
+	movaps	xmm0, XMMWORD [wk(1)]	; xmm0=tmp7
+
+	addps	xmm2,xmm3		; xmm2=tmp10
+	addps	xmm3,xmm6		; xmm3=tmp11
+	addps	xmm6,xmm0		; xmm6=tmp12, xmm0=tmp7
+
+	mulps	xmm3,[PD_0_707] ; xmm3=z3
+
+	movaps	xmm1,xmm2		; xmm1=tmp10
+	subps	xmm2,xmm6
+	mulps	xmm2,[PD_0_382] ; xmm2=z5
+	mulps	xmm1,[PD_0_541] ; xmm1=MULTIPLY(tmp10,FIX_0_541196)
+	mulps	xmm6,[PD_1_306] ; xmm6=MULTIPLY(tmp12,FIX_1_306562)
+	addps	xmm1,xmm2		; xmm1=z2
+	addps	xmm6,xmm2		; xmm6=z4
+
+	movaps	xmm5,xmm0
+	subps	xmm0,xmm3		; xmm0=z13
+	addps	xmm5,xmm3		; xmm5=z11
+
+	movaps	xmm7,xmm0
+	movaps	xmm4,xmm5
+	subps	xmm0,xmm1		; xmm0=data3
+	subps	xmm5,xmm6		; xmm5=data7
+	addps	xmm7,xmm1		; xmm7=data5
+	addps	xmm4,xmm6		; xmm4=data1
+
+	movaps	XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_FAST_FLOAT)], xmm0
+	movaps	XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_FAST_FLOAT)], xmm5
+	movaps	XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_FAST_FLOAT)], xmm7
+	movaps	XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FAST_FLOAT)], xmm4
+
+	add	rdx, byte 4*SIZEOF_FAST_FLOAT
+	dec	rcx
+	jnz	near .columnloop
+
+	uncollect_args
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
diff --git a/simd/jiss2flt-64.asm b/simd/jiss2flt-64.asm
new file mode 100644
index 0000000..572909d
--- /dev/null
+++ b/simd/jiss2flt-64.asm
@@ -0,0 +1,479 @@
+;
+; jiss2flt.asm - floating-point IDCT (64-bit SSE & SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; This file contains a floating-point implementation of the inverse DCT
+; (Discrete Cosine Transform). The following code is based directly on
+; the IJG's original jidctflt.c; see the jidctflt.c for more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%macro	unpcklps2 2	; %1=(0 1 2 3) / %2=(4 5 6 7) => %1=(0 1 4 5)
+	shufps	%1,%2,0x44
+%endmacro
+
+%macro	unpckhps2 2	; %1=(0 1 2 3) / %2=(4 5 6 7) => %1=(2 3 6 7)
+	shufps	%1,%2,0xEE
+%endmacro
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_idct_float_sse2)
+
+EXTN(jconst_idct_float_sse2):
+
+PD_1_414	times 4 dd  1.414213562373095048801689
+PD_1_847	times 4 dd  1.847759065022573512256366
+PD_1_082	times 4 dd  1.082392200292393968799446
+PD_M2_613	times 4 dd -2.613125929752753055713286
+PD_RNDINT_MAGIC	times 4 dd  100663296.0	; (float)(0x00C00000 << 3)
+PB_CENTERJSAMP	times 16 db CENTERJSAMPLE
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Perform dequantization and inverse DCT on one block of coefficients.
+;
+; GLOBAL(void)
+; jsimd_idct_float_sse2 (void * dct_table, JCOEFPTR coef_block,
+;                        JSAMPARRAY output_buf, JDIMENSION output_col)
+;
+
+; r10 = void * dct_table
+; r11 = JCOEFPTR coef_block
+; r12 = JSAMPARRAY output_buf
+; r13 = JDIMENSION output_col
+
+%define original_rbp	rbp+0
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		2
+%define workspace	wk(0)-DCTSIZE2*SIZEOF_FAST_FLOAT
+					; FAST_FLOAT workspace[DCTSIZE2]
+
+	align	16
+	global	EXTN(jsimd_idct_float_sse2)
+
+EXTN(jsimd_idct_float_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],eax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [workspace]
+	push	rbx
+	collect_args
+
+	; ---- Pass 1: process columns from input, store into work array.
+
+	mov	rdx, r10	; quantptr
+	mov	rsi, r11		; inptr
+	lea	rdi, [workspace]			; FAST_FLOAT * wsptr
+	mov	rcx, DCTSIZE/4				; ctr
+.columnloop:
+%ifndef NO_ZERO_COLUMN_TEST_FLOAT_SSE
+	mov	eax, DWORD [DWBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	or	eax, DWORD [DWBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	jnz	near .columnDCT
+
+	movq	xmm1, XMM_MMWORD [MMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movq	xmm2, XMM_MMWORD [MMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	movq	xmm3, XMM_MMWORD [MMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	movq	xmm4, XMM_MMWORD [MMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
+	movq	xmm5, XMM_MMWORD [MMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	movq	xmm6, XMM_MMWORD [MMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+	movq	xmm7, XMM_MMWORD [MMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1,xmm2
+	por	xmm3,xmm4
+	por	xmm5,xmm6
+	por	xmm1,xmm3
+	por	xmm5,xmm7
+	por	xmm1,xmm5
+	packsswb xmm1,xmm1
+	movd	eax,xmm1
+	test	rax,rax
+	jnz	short .columnDCT
+
+	; -- AC terms all zero
+
+	movq      xmm0, XMM_MMWORD [MMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+
+	punpcklwd xmm0,xmm0		; xmm0=(00 00 01 01 02 02 03 03)
+	psrad     xmm0,(DWORD_BIT-WORD_BIT)	; xmm0=in0=(00 01 02 03)
+	cvtdq2ps  xmm0,xmm0			; xmm0=in0=(00 01 02 03)
+
+	mulps	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+
+	movaps	xmm1,xmm0
+	movaps	xmm2,xmm0
+	movaps	xmm3,xmm0
+
+	shufps	xmm0,xmm0,0x00			; xmm0=(00 00 00 00)
+	shufps	xmm1,xmm1,0x55			; xmm1=(01 01 01 01)
+	shufps	xmm2,xmm2,0xAA			; xmm2=(02 02 02 02)
+	shufps	xmm3,xmm3,0xFF			; xmm3=(03 03 03 03)
+
+	movaps	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_FAST_FLOAT)], xmm0
+	movaps	XMMWORD [XMMBLOCK(0,1,rdi,SIZEOF_FAST_FLOAT)], xmm0
+	movaps	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_FAST_FLOAT)], xmm1
+	movaps	XMMWORD [XMMBLOCK(1,1,rdi,SIZEOF_FAST_FLOAT)], xmm1
+	movaps	XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_FAST_FLOAT)], xmm2
+	movaps	XMMWORD [XMMBLOCK(2,1,rdi,SIZEOF_FAST_FLOAT)], xmm2
+	movaps	XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_FAST_FLOAT)], xmm3
+	movaps	XMMWORD [XMMBLOCK(3,1,rdi,SIZEOF_FAST_FLOAT)], xmm3
+	jmp	near .nextcolumn
+%endif
+.columnDCT:
+
+	; -- Even part
+
+	movq      xmm0, XMM_MMWORD [MMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	movq      xmm1, XMM_MMWORD [MMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	movq      xmm2, XMM_MMWORD [MMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
+	movq      xmm3, XMM_MMWORD [MMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+
+	punpcklwd xmm0,xmm0		; xmm0=(00 00 01 01 02 02 03 03)
+	punpcklwd xmm1,xmm1		; xmm1=(20 20 21 21 22 22 23 23)
+	psrad     xmm0,(DWORD_BIT-WORD_BIT)	; xmm0=in0=(00 01 02 03)
+	psrad     xmm1,(DWORD_BIT-WORD_BIT)	; xmm1=in2=(20 21 22 23)
+	cvtdq2ps  xmm0,xmm0			; xmm0=in0=(00 01 02 03)
+	cvtdq2ps  xmm1,xmm1			; xmm1=in2=(20 21 22 23)
+
+	punpcklwd xmm2,xmm2		; xmm2=(40 40 41 41 42 42 43 43)
+	punpcklwd xmm3,xmm3		; xmm3=(60 60 61 61 62 62 63 63)
+	psrad     xmm2,(DWORD_BIT-WORD_BIT)	; xmm2=in4=(40 41 42 43)
+	psrad     xmm3,(DWORD_BIT-WORD_BIT)	; xmm3=in6=(60 61 62 63)
+	cvtdq2ps  xmm2,xmm2			; xmm2=in4=(40 41 42 43)
+	cvtdq2ps  xmm3,xmm3			; xmm3=in6=(60 61 62 63)
+
+	mulps     xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+	mulps     xmm1, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+	mulps     xmm2, XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+	mulps     xmm3, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+
+	movaps	xmm4,xmm0
+	movaps	xmm5,xmm1
+	subps	xmm0,xmm2		; xmm0=tmp11
+	subps	xmm1,xmm3
+	addps	xmm4,xmm2		; xmm4=tmp10
+	addps	xmm5,xmm3		; xmm5=tmp13
+
+	mulps	xmm1,[PD_1_414]
+	subps	xmm1,xmm5		; xmm1=tmp12
+
+	movaps	xmm6,xmm4
+	movaps	xmm7,xmm0
+	subps	xmm4,xmm5		; xmm4=tmp3
+	subps	xmm0,xmm1		; xmm0=tmp2
+	addps	xmm6,xmm5		; xmm6=tmp0
+	addps	xmm7,xmm1		; xmm7=tmp1
+
+	movaps	XMMWORD [wk(1)], xmm4	; tmp3
+	movaps	XMMWORD [wk(0)], xmm0	; tmp2
+
+	; -- Odd part
+
+	movq      xmm2, XMM_MMWORD [MMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movq      xmm3, XMM_MMWORD [MMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	movq      xmm5, XMM_MMWORD [MMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	movq      xmm1, XMM_MMWORD [MMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+
+	punpcklwd xmm2,xmm2		; xmm2=(10 10 11 11 12 12 13 13)
+	punpcklwd xmm3,xmm3		; xmm3=(30 30 31 31 32 32 33 33)
+	psrad     xmm2,(DWORD_BIT-WORD_BIT)	; xmm2=in1=(10 11 12 13)
+	psrad     xmm3,(DWORD_BIT-WORD_BIT)	; xmm3=in3=(30 31 32 33)
+	cvtdq2ps  xmm2,xmm2			; xmm2=in1=(10 11 12 13)
+	cvtdq2ps  xmm3,xmm3			; xmm3=in3=(30 31 32 33)
+
+	punpcklwd xmm5,xmm5		; xmm5=(50 50 51 51 52 52 53 53)
+	punpcklwd xmm1,xmm1		; xmm1=(70 70 71 71 72 72 73 73)
+	psrad     xmm5,(DWORD_BIT-WORD_BIT)	; xmm5=in5=(50 51 52 53)
+	psrad     xmm1,(DWORD_BIT-WORD_BIT)	; xmm1=in7=(70 71 72 73)
+	cvtdq2ps  xmm5,xmm5			; xmm5=in5=(50 51 52 53)
+	cvtdq2ps  xmm1,xmm1			; xmm1=in7=(70 71 72 73)
+
+	mulps     xmm2, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+	mulps     xmm3, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+	mulps     xmm5, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+	mulps     xmm1, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_FLOAT_MULT_TYPE)]
+
+	movaps	xmm4,xmm2
+	movaps	xmm0,xmm5
+	addps	xmm2,xmm1		; xmm2=z11
+	addps	xmm5,xmm3		; xmm5=z13
+	subps	xmm4,xmm1		; xmm4=z12
+	subps	xmm0,xmm3		; xmm0=z10
+
+	movaps	xmm1,xmm2
+	subps	xmm2,xmm5
+	addps	xmm1,xmm5		; xmm1=tmp7
+
+	mulps	xmm2,[PD_1_414]	; xmm2=tmp11
+
+	movaps	xmm3,xmm0
+	addps	xmm0,xmm4
+	mulps	xmm0,[PD_1_847]	; xmm0=z5
+	mulps	xmm3,[PD_M2_613]	; xmm3=(z10 * -2.613125930)
+	mulps	xmm4,[PD_1_082]	; xmm4=(z12 * 1.082392200)
+	addps	xmm3,xmm0		; xmm3=tmp12
+	subps	xmm4,xmm0		; xmm4=tmp10
+
+	; -- Final output stage
+
+	subps	xmm3,xmm1		; xmm3=tmp6
+	movaps	xmm5,xmm6
+	movaps	xmm0,xmm7
+	addps	xmm6,xmm1		; xmm6=data0=(00 01 02 03)
+	addps	xmm7,xmm3		; xmm7=data1=(10 11 12 13)
+	subps	xmm5,xmm1		; xmm5=data7=(70 71 72 73)
+	subps	xmm0,xmm3		; xmm0=data6=(60 61 62 63)
+	subps	xmm2,xmm3		; xmm2=tmp5
+
+	movaps    xmm1,xmm6		; transpose coefficients(phase 1)
+	unpcklps  xmm6,xmm7		; xmm6=(00 10 01 11)
+	unpckhps  xmm1,xmm7		; xmm1=(02 12 03 13)
+	movaps    xmm3,xmm0		; transpose coefficients(phase 1)
+	unpcklps  xmm0,xmm5		; xmm0=(60 70 61 71)
+	unpckhps  xmm3,xmm5		; xmm3=(62 72 63 73)
+
+	movaps	xmm7, XMMWORD [wk(0)]	; xmm7=tmp2
+	movaps	xmm5, XMMWORD [wk(1)]	; xmm5=tmp3
+
+	movaps	XMMWORD [wk(0)], xmm0	; wk(0)=(60 70 61 71)
+	movaps	XMMWORD [wk(1)], xmm3	; wk(1)=(62 72 63 73)
+
+	addps	xmm4,xmm2		; xmm4=tmp4
+	movaps	xmm0,xmm7
+	movaps	xmm3,xmm5
+	addps	xmm7,xmm2		; xmm7=data2=(20 21 22 23)
+	addps	xmm5,xmm4		; xmm5=data4=(40 41 42 43)
+	subps	xmm0,xmm2		; xmm0=data5=(50 51 52 53)
+	subps	xmm3,xmm4		; xmm3=data3=(30 31 32 33)
+
+	movaps    xmm2,xmm7		; transpose coefficients(phase 1)
+	unpcklps  xmm7,xmm3		; xmm7=(20 30 21 31)
+	unpckhps  xmm2,xmm3		; xmm2=(22 32 23 33)
+	movaps    xmm4,xmm5		; transpose coefficients(phase 1)
+	unpcklps  xmm5,xmm0		; xmm5=(40 50 41 51)
+	unpckhps  xmm4,xmm0		; xmm4=(42 52 43 53)
+
+	movaps    xmm3,xmm6		; transpose coefficients(phase 2)
+	unpcklps2 xmm6,xmm7		; xmm6=(00 10 20 30)
+	unpckhps2 xmm3,xmm7		; xmm3=(01 11 21 31)
+	movaps    xmm0,xmm1		; transpose coefficients(phase 2)
+	unpcklps2 xmm1,xmm2		; xmm1=(02 12 22 32)
+	unpckhps2 xmm0,xmm2		; xmm0=(03 13 23 33)
+
+	movaps	xmm7, XMMWORD [wk(0)]	; xmm7=(60 70 61 71)
+	movaps	xmm2, XMMWORD [wk(1)]	; xmm2=(62 72 63 73)
+
+	movaps	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_FAST_FLOAT)], xmm6
+	movaps	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_FAST_FLOAT)], xmm3
+	movaps	XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_FAST_FLOAT)], xmm1
+	movaps	XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_FAST_FLOAT)], xmm0
+
+	movaps    xmm6,xmm5		; transpose coefficients(phase 2)
+	unpcklps2 xmm5,xmm7		; xmm5=(40 50 60 70)
+	unpckhps2 xmm6,xmm7		; xmm6=(41 51 61 71)
+	movaps    xmm3,xmm4		; transpose coefficients(phase 2)
+	unpcklps2 xmm4,xmm2		; xmm4=(42 52 62 72)
+	unpckhps2 xmm3,xmm2		; xmm3=(43 53 63 73)
+
+	movaps	XMMWORD [XMMBLOCK(0,1,rdi,SIZEOF_FAST_FLOAT)], xmm5
+	movaps	XMMWORD [XMMBLOCK(1,1,rdi,SIZEOF_FAST_FLOAT)], xmm6
+	movaps	XMMWORD [XMMBLOCK(2,1,rdi,SIZEOF_FAST_FLOAT)], xmm4
+	movaps	XMMWORD [XMMBLOCK(3,1,rdi,SIZEOF_FAST_FLOAT)], xmm3
+
+.nextcolumn:
+	add	rsi, byte 4*SIZEOF_JCOEF		; coef_block
+	add	rdx, byte 4*SIZEOF_FLOAT_MULT_TYPE	; quantptr
+	add	rdi,      4*DCTSIZE*SIZEOF_FAST_FLOAT	; wsptr
+	dec	rcx					; ctr
+	jnz	near .columnloop
+
+	; -- Prefetch the next coefficient block
+
+	prefetchnta [rsi + (DCTSIZE2-8)*SIZEOF_JCOEF + 0*32]
+	prefetchnta [rsi + (DCTSIZE2-8)*SIZEOF_JCOEF + 1*32]
+	prefetchnta [rsi + (DCTSIZE2-8)*SIZEOF_JCOEF + 2*32]
+	prefetchnta [rsi + (DCTSIZE2-8)*SIZEOF_JCOEF + 3*32]
+
+	; ---- Pass 2: process rows from work array, store into output array.
+
+	mov	rax, [original_rbp]
+	lea	rsi, [workspace]			; FAST_FLOAT * wsptr
+	mov	rdi, r12	; (JSAMPROW *)
+	mov	rax, r13
+	mov	rcx, DCTSIZE/4				; ctr
+.rowloop:
+
+	; -- Even part
+
+	movaps	xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm2, XMMWORD [XMMBLOCK(4,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_FAST_FLOAT)]
+
+	movaps	xmm4,xmm0
+	movaps	xmm5,xmm1
+	subps	xmm0,xmm2		; xmm0=tmp11
+	subps	xmm1,xmm3
+	addps	xmm4,xmm2		; xmm4=tmp10
+	addps	xmm5,xmm3		; xmm5=tmp13
+
+	mulps	xmm1,[PD_1_414]
+	subps	xmm1,xmm5		; xmm1=tmp12
+
+	movaps	xmm6,xmm4
+	movaps	xmm7,xmm0
+	subps	xmm4,xmm5		; xmm4=tmp3
+	subps	xmm0,xmm1		; xmm0=tmp2
+	addps	xmm6,xmm5		; xmm6=tmp0
+	addps	xmm7,xmm1		; xmm7=tmp1
+
+	movaps	XMMWORD [wk(1)], xmm4	; tmp3
+	movaps	XMMWORD [wk(0)], xmm0	; tmp2
+
+	; -- Odd part
+
+	movaps	xmm2, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm5, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_FAST_FLOAT)]
+
+	movaps	xmm4,xmm2
+	movaps	xmm0,xmm5
+	addps	xmm2,xmm1		; xmm2=z11
+	addps	xmm5,xmm3		; xmm5=z13
+	subps	xmm4,xmm1		; xmm4=z12
+	subps	xmm0,xmm3		; xmm0=z10
+
+	movaps	xmm1,xmm2
+	subps	xmm2,xmm5
+	addps	xmm1,xmm5		; xmm1=tmp7
+
+	mulps	xmm2,[PD_1_414]	; xmm2=tmp11
+
+	movaps	xmm3,xmm0
+	addps	xmm0,xmm4
+	mulps	xmm0,[PD_1_847]	; xmm0=z5
+	mulps	xmm3,[PD_M2_613]	; xmm3=(z10 * -2.613125930)
+	mulps	xmm4,[PD_1_082]	; xmm4=(z12 * 1.082392200)
+	addps	xmm3,xmm0		; xmm3=tmp12
+	subps	xmm4,xmm0		; xmm4=tmp10
+
+	; -- Final output stage
+
+	subps	xmm3,xmm1		; xmm3=tmp6
+	movaps	xmm5,xmm6
+	movaps	xmm0,xmm7
+	addps	xmm6,xmm1		; xmm6=data0=(00 10 20 30)
+	addps	xmm7,xmm3		; xmm7=data1=(01 11 21 31)
+	subps	xmm5,xmm1		; xmm5=data7=(07 17 27 37)
+	subps	xmm0,xmm3		; xmm0=data6=(06 16 26 36)
+	subps	xmm2,xmm3		; xmm2=tmp5
+
+	movaps	xmm1,[PD_RNDINT_MAGIC]	; xmm1=[PD_RNDINT_MAGIC]
+	pcmpeqd	xmm3,xmm3
+	psrld	xmm3,WORD_BIT		; xmm3={0xFFFF 0x0000 0xFFFF 0x0000 ..}
+
+	addps	xmm6,xmm1	; xmm6=roundint(data0/8)=(00 ** 10 ** 20 ** 30 **)
+	addps	xmm7,xmm1	; xmm7=roundint(data1/8)=(01 ** 11 ** 21 ** 31 **)
+	addps	xmm0,xmm1	; xmm0=roundint(data6/8)=(06 ** 16 ** 26 ** 36 **)
+	addps	xmm5,xmm1	; xmm5=roundint(data7/8)=(07 ** 17 ** 27 ** 37 **)
+
+	pand	xmm6,xmm3		; xmm6=(00 -- 10 -- 20 -- 30 --)
+	pslld	xmm7,WORD_BIT		; xmm7=(-- 01 -- 11 -- 21 -- 31)
+	pand	xmm0,xmm3		; xmm0=(06 -- 16 -- 26 -- 36 --)
+	pslld	xmm5,WORD_BIT		; xmm5=(-- 07 -- 17 -- 27 -- 37)
+	por	xmm6,xmm7		; xmm6=(00 01 10 11 20 21 30 31)
+	por	xmm0,xmm5		; xmm0=(06 07 16 17 26 27 36 37)
+
+	movaps	xmm1, XMMWORD [wk(0)]	; xmm1=tmp2
+	movaps	xmm3, XMMWORD [wk(1)]	; xmm3=tmp3
+
+	addps	xmm4,xmm2		; xmm4=tmp4
+	movaps	xmm7,xmm1
+	movaps	xmm5,xmm3
+	addps	xmm1,xmm2		; xmm1=data2=(02 12 22 32)
+	addps	xmm3,xmm4		; xmm3=data4=(04 14 24 34)
+	subps	xmm7,xmm2		; xmm7=data5=(05 15 25 35)
+	subps	xmm5,xmm4		; xmm5=data3=(03 13 23 33)
+
+	movaps	xmm2,[PD_RNDINT_MAGIC]	; xmm2=[PD_RNDINT_MAGIC]
+	pcmpeqd	xmm4,xmm4
+	psrld	xmm4,WORD_BIT		; xmm4={0xFFFF 0x0000 0xFFFF 0x0000 ..}
+
+	addps	xmm3,xmm2	; xmm3=roundint(data4/8)=(04 ** 14 ** 24 ** 34 **)
+	addps	xmm7,xmm2	; xmm7=roundint(data5/8)=(05 ** 15 ** 25 ** 35 **)
+	addps	xmm1,xmm2	; xmm1=roundint(data2/8)=(02 ** 12 ** 22 ** 32 **)
+	addps	xmm5,xmm2	; xmm5=roundint(data3/8)=(03 ** 13 ** 23 ** 33 **)
+
+	pand	xmm3,xmm4		; xmm3=(04 -- 14 -- 24 -- 34 --)
+	pslld	xmm7,WORD_BIT		; xmm7=(-- 05 -- 15 -- 25 -- 35)
+	pand	xmm1,xmm4		; xmm1=(02 -- 12 -- 22 -- 32 --)
+	pslld	xmm5,WORD_BIT		; xmm5=(-- 03 -- 13 -- 23 -- 33)
+	por	xmm3,xmm7		; xmm3=(04 05 14 15 24 25 34 35)
+	por	xmm1,xmm5		; xmm1=(02 03 12 13 22 23 32 33)
+
+	movdqa    xmm2,[PB_CENTERJSAMP]	; xmm2=[PB_CENTERJSAMP]
+
+	packsswb  xmm6,xmm3	; xmm6=(00 01 10 11 20 21 30 31 04 05 14 15 24 25 34 35)
+	packsswb  xmm1,xmm0	; xmm1=(02 03 12 13 22 23 32 33 06 07 16 17 26 27 36 37)
+	paddb     xmm6,xmm2
+	paddb     xmm1,xmm2
+
+	movdqa    xmm4,xmm6	; transpose coefficients(phase 2)
+	punpcklwd xmm6,xmm1	; xmm6=(00 01 02 03 10 11 12 13 20 21 22 23 30 31 32 33)
+	punpckhwd xmm4,xmm1	; xmm4=(04 05 06 07 14 15 16 17 24 25 26 27 34 35 36 37)
+
+	movdqa    xmm7,xmm6	; transpose coefficients(phase 3)
+	punpckldq xmm6,xmm4	; xmm6=(00 01 02 03 04 05 06 07 10 11 12 13 14 15 16 17)
+	punpckhdq xmm7,xmm4	; xmm7=(20 21 22 23 24 25 26 27 30 31 32 33 34 35 36 37)
+
+	pshufd	xmm5,xmm6,0x4E	; xmm5=(10 11 12 13 14 15 16 17 00 01 02 03 04 05 06 07)
+	pshufd	xmm3,xmm7,0x4E	; xmm3=(30 31 32 33 34 35 36 37 20 21 22 23 24 25 26 27)
+
+	mov	rdx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
+	mov	rbx, JSAMPROW [rdi+2*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm6
+	movq	XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE], xmm7
+	mov	rdx, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
+	mov	rbx, JSAMPROW [rdi+3*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm5
+	movq	XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE], xmm3
+
+	add	rsi, byte 4*SIZEOF_FAST_FLOAT	; wsptr
+	add	rdi, byte 4*SIZEOF_JSAMPROW
+	dec	rcx				; ctr
+	jnz	near .rowloop
+
+	uncollect_args
+	pop	rbx
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
diff --git a/simd/jiss2fst-64.asm b/simd/jiss2fst-64.asm
new file mode 100644
index 0000000..97dfa76
--- /dev/null
+++ b/simd/jiss2fst-64.asm
@@ -0,0 +1,488 @@
+;
+; jiss2fst.asm - fast integer IDCT (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/projecpt/showfiles.php?group_id=6208
+;
+; This file contains a fast, not so accurate integer implementation of
+; the inverse DCT (Discrete Cosine Transform). The following code is
+; based directly on the IJG's original jidctfst.c; see the jidctfst.c
+; for more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%define CONST_BITS	8	; 14 is also OK.
+%define PASS1_BITS	2
+
+%if IFAST_SCALE_BITS != PASS1_BITS
+%error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'."
+%endif
+
+%if CONST_BITS == 8
+F_1_082	equ	277		; FIX(1.082392200)
+F_1_414	equ	362		; FIX(1.414213562)
+F_1_847	equ	473		; FIX(1.847759065)
+F_2_613	equ	669		; FIX(2.613125930)
+F_1_613	equ	(F_2_613 - 256)	; FIX(2.613125930) - FIX(1)
+%else
+; NASM cannot do compile-time arithmetic on floating-point constants.
+%define	DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
+F_1_082	equ	DESCALE(1162209775,30-CONST_BITS)	; FIX(1.082392200)
+F_1_414	equ	DESCALE(1518500249,30-CONST_BITS)	; FIX(1.414213562)
+F_1_847	equ	DESCALE(1984016188,30-CONST_BITS)	; FIX(1.847759065)
+F_2_613	equ	DESCALE(2805822602,30-CONST_BITS)	; FIX(2.613125930)
+F_1_613	equ	(F_2_613 - (1 << CONST_BITS))	; FIX(2.613125930) - FIX(1)
+%endif
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow)
+; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw)
+
+%define PRE_MULTIPLY_SCALE_BITS   2
+%define CONST_SHIFT     (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)
+
+	alignz	16
+	global	EXTN(jconst_idct_ifast_sse2)
+
+EXTN(jconst_idct_ifast_sse2):
+
+PW_F1414	times 8 dw  F_1_414 << CONST_SHIFT
+PW_F1847	times 8 dw  F_1_847 << CONST_SHIFT
+PW_MF1613	times 8 dw -F_1_613 << CONST_SHIFT
+PW_F1082	times 8 dw  F_1_082 << CONST_SHIFT
+PB_CENTERJSAMP	times 16 db CENTERJSAMPLE
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Perform dequantization and inverse DCT on one block of coefficients.
+;
+; GLOBAL(void)
+; jsimd_idct_ifast_sse2 (void * dct_table, JCOEFPTR coef_block,
+;                       JSAMPARRAY output_buf, JDIMENSION output_col)
+;
+
+; r10 = jpeg_component_info * compptr
+; r11 = JCOEFPTR coef_block
+; r12 = JSAMPARRAY output_buf
+; r13 = JDIMENSION output_col
+
+%define original_rbp	rbp+0
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		2
+
+	align	16
+	global	EXTN(jsimd_idct_ifast_sse2)
+
+EXTN(jsimd_idct_ifast_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],eax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	collect_args
+
+	; ---- Pass 1: process columns from input.
+
+	mov	rdx, r10	; quantptr
+	mov	rsi, r11		; inptr
+
+%ifndef NO_ZERO_COLUMN_TEST_IFAST_SSE2
+	mov	eax, DWORD [DWBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	or	eax, DWORD [DWBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	jnz	near .columnDCT
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1, XMMWORD [XMMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1,xmm0
+	packsswb xmm1,xmm1
+	packsswb xmm1,xmm1
+	movd	eax,xmm1
+	test	rax,rax
+	jnz	short .columnDCT
+
+	; -- AC terms all zero
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	movdqa    xmm7,xmm0		; xmm0=in0=(00 01 02 03 04 05 06 07)
+	punpcklwd xmm0,xmm0		; xmm0=(00 00 01 01 02 02 03 03)
+	punpckhwd xmm7,xmm7		; xmm7=(04 04 05 05 06 06 07 07)
+
+	pshufd	xmm6,xmm0,0x00		; xmm6=col0=(00 00 00 00 00 00 00 00)
+	pshufd	xmm2,xmm0,0x55		; xmm2=col1=(01 01 01 01 01 01 01 01)
+	pshufd	xmm5,xmm0,0xAA		; xmm5=col2=(02 02 02 02 02 02 02 02)
+	pshufd	xmm0,xmm0,0xFF		; xmm0=col3=(03 03 03 03 03 03 03 03)
+	pshufd	xmm1,xmm7,0x00		; xmm1=col4=(04 04 04 04 04 04 04 04)
+	pshufd	xmm4,xmm7,0x55		; xmm4=col5=(05 05 05 05 05 05 05 05)
+	pshufd	xmm3,xmm7,0xAA		; xmm3=col6=(06 06 06 06 06 06 06 06)
+	pshufd	xmm7,xmm7,0xFF		; xmm7=col7=(07 07 07 07 07 07 07 07)
+
+	movdqa	XMMWORD [wk(0)], xmm2	; wk(0)=col1
+	movdqa	XMMWORD [wk(1)], xmm0	; wk(1)=col3
+	jmp	near .column_end
+%endif
+.columnDCT:
+
+	; -- Even part
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+	pmullw	xmm1, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+	movdqa	xmm2, XMMWORD [XMMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm2, XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+	pmullw	xmm3, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+
+	movdqa	xmm4,xmm0
+	movdqa	xmm5,xmm1
+	psubw	xmm0,xmm2		; xmm0=tmp11
+	psubw	xmm1,xmm3
+	paddw	xmm4,xmm2		; xmm4=tmp10
+	paddw	xmm5,xmm3		; xmm5=tmp13
+
+	psllw	xmm1,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm1,[PW_F1414]
+	psubw	xmm1,xmm5		; xmm1=tmp12
+
+	movdqa	xmm6,xmm4
+	movdqa	xmm7,xmm0
+	psubw	xmm4,xmm5		; xmm4=tmp3
+	psubw	xmm0,xmm1		; xmm0=tmp2
+	paddw	xmm6,xmm5		; xmm6=tmp0
+	paddw	xmm7,xmm1		; xmm7=tmp1
+
+	movdqa	XMMWORD [wk(1)], xmm4	; wk(1)=tmp3
+	movdqa	XMMWORD [wk(0)], xmm0	; wk(0)=tmp2
+
+	; -- Odd part
+
+	movdqa	xmm2, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm2, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+	pmullw	xmm3, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+	movdqa	xmm5, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm5, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+	pmullw	xmm1, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_IFAST_MULT_TYPE)]
+
+	movdqa	xmm4,xmm2
+	movdqa	xmm0,xmm5
+	psubw	xmm2,xmm1		; xmm2=z12
+	psubw	xmm5,xmm3		; xmm5=z10
+	paddw	xmm4,xmm1		; xmm4=z11
+	paddw	xmm0,xmm3		; xmm0=z13
+
+	movdqa	xmm1,xmm5		; xmm1=z10(unscaled)
+	psllw	xmm2,PRE_MULTIPLY_SCALE_BITS
+	psllw	xmm5,PRE_MULTIPLY_SCALE_BITS
+
+	movdqa	xmm3,xmm4
+	psubw	xmm4,xmm0
+	paddw	xmm3,xmm0		; xmm3=tmp7
+
+	psllw	xmm4,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm4,[PW_F1414]	; xmm4=tmp11
+
+	; To avoid overflow...
+	;
+	; (Original)
+	; tmp12 = -2.613125930 * z10 + z5;
+	;
+	; (This implementation)
+	; tmp12 = (-1.613125930 - 1) * z10 + z5;
+	;       = -1.613125930 * z10 - z10 + z5;
+
+	movdqa	xmm0,xmm5
+	paddw	xmm5,xmm2
+	pmulhw	xmm5,[PW_F1847]	; xmm5=z5
+	pmulhw	xmm0,[PW_MF1613]
+	pmulhw	xmm2,[PW_F1082]
+	psubw	xmm0,xmm1
+	psubw	xmm2,xmm5		; xmm2=tmp10
+	paddw	xmm0,xmm5		; xmm0=tmp12
+
+	; -- Final output stage
+
+	psubw	xmm0,xmm3		; xmm0=tmp6
+	movdqa	xmm1,xmm6
+	movdqa	xmm5,xmm7
+	paddw	xmm6,xmm3		; xmm6=data0=(00 01 02 03 04 05 06 07)
+	paddw	xmm7,xmm0		; xmm7=data1=(10 11 12 13 14 15 16 17)
+	psubw	xmm1,xmm3		; xmm1=data7=(70 71 72 73 74 75 76 77)
+	psubw	xmm5,xmm0		; xmm5=data6=(60 61 62 63 64 65 66 67)
+	psubw	xmm4,xmm0		; xmm4=tmp5
+
+	movdqa    xmm3,xmm6		; transpose coefficients(phase 1)
+	punpcklwd xmm6,xmm7		; xmm6=(00 10 01 11 02 12 03 13)
+	punpckhwd xmm3,xmm7		; xmm3=(04 14 05 15 06 16 07 17)
+	movdqa    xmm0,xmm5		; transpose coefficients(phase 1)
+	punpcklwd xmm5,xmm1		; xmm5=(60 70 61 71 62 72 63 73)
+	punpckhwd xmm0,xmm1		; xmm0=(64 74 65 75 66 76 67 77)
+
+	movdqa	xmm7, XMMWORD [wk(0)]	; xmm7=tmp2
+	movdqa	xmm1, XMMWORD [wk(1)]	; xmm1=tmp3
+
+	movdqa	XMMWORD [wk(0)], xmm5	; wk(0)=(60 70 61 71 62 72 63 73)
+	movdqa	XMMWORD [wk(1)], xmm0	; wk(1)=(64 74 65 75 66 76 67 77)
+
+	paddw	xmm2,xmm4		; xmm2=tmp4
+	movdqa	xmm5,xmm7
+	movdqa	xmm0,xmm1
+	paddw	xmm7,xmm4		; xmm7=data2=(20 21 22 23 24 25 26 27)
+	paddw	xmm1,xmm2		; xmm1=data4=(40 41 42 43 44 45 46 47)
+	psubw	xmm5,xmm4		; xmm5=data5=(50 51 52 53 54 55 56 57)
+	psubw	xmm0,xmm2		; xmm0=data3=(30 31 32 33 34 35 36 37)
+
+	movdqa    xmm4,xmm7		; transpose coefficients(phase 1)
+	punpcklwd xmm7,xmm0		; xmm7=(20 30 21 31 22 32 23 33)
+	punpckhwd xmm4,xmm0		; xmm4=(24 34 25 35 26 36 27 37)
+	movdqa    xmm2,xmm1		; transpose coefficients(phase 1)
+	punpcklwd xmm1,xmm5		; xmm1=(40 50 41 51 42 52 43 53)
+	punpckhwd xmm2,xmm5		; xmm2=(44 54 45 55 46 56 47 57)
+
+	movdqa    xmm0,xmm3		; transpose coefficients(phase 2)
+	punpckldq xmm3,xmm4		; xmm3=(04 14 24 34 05 15 25 35)
+	punpckhdq xmm0,xmm4		; xmm0=(06 16 26 36 07 17 27 37)
+	movdqa    xmm5,xmm6		; transpose coefficients(phase 2)
+	punpckldq xmm6,xmm7		; xmm6=(00 10 20 30 01 11 21 31)
+	punpckhdq xmm5,xmm7		; xmm5=(02 12 22 32 03 13 23 33)
+
+	movdqa	xmm4, XMMWORD [wk(0)]	; xmm4=(60 70 61 71 62 72 63 73)
+	movdqa	xmm7, XMMWORD [wk(1)]	; xmm7=(64 74 65 75 66 76 67 77)
+
+	movdqa	XMMWORD [wk(0)], xmm3	; wk(0)=(04 14 24 34 05 15 25 35)
+	movdqa	XMMWORD [wk(1)], xmm0	; wk(1)=(06 16 26 36 07 17 27 37)
+
+	movdqa    xmm3,xmm1		; transpose coefficients(phase 2)
+	punpckldq xmm1,xmm4		; xmm1=(40 50 60 70 41 51 61 71)
+	punpckhdq xmm3,xmm4		; xmm3=(42 52 62 72 43 53 63 73)
+	movdqa    xmm0,xmm2		; transpose coefficients(phase 2)
+	punpckldq xmm2,xmm7		; xmm2=(44 54 64 74 45 55 65 75)
+	punpckhdq xmm0,xmm7		; xmm0=(46 56 66 76 47 57 67 77)
+
+	movdqa     xmm4,xmm6		; transpose coefficients(phase 3)
+	punpcklqdq xmm6,xmm1		; xmm6=col0=(00 10 20 30 40 50 60 70)
+	punpckhqdq xmm4,xmm1		; xmm4=col1=(01 11 21 31 41 51 61 71)
+	movdqa     xmm7,xmm5		; transpose coefficients(phase 3)
+	punpcklqdq xmm5,xmm3		; xmm5=col2=(02 12 22 32 42 52 62 72)
+	punpckhqdq xmm7,xmm3		; xmm7=col3=(03 13 23 33 43 53 63 73)
+
+	movdqa	xmm1, XMMWORD [wk(0)]	; xmm1=(04 14 24 34 05 15 25 35)
+	movdqa	xmm3, XMMWORD [wk(1)]	; xmm3=(06 16 26 36 07 17 27 37)
+
+	movdqa	XMMWORD [wk(0)], xmm4	; wk(0)=col1
+	movdqa	XMMWORD [wk(1)], xmm7	; wk(1)=col3
+
+	movdqa     xmm4,xmm1		; transpose coefficients(phase 3)
+	punpcklqdq xmm1,xmm2		; xmm1=col4=(04 14 24 34 44 54 64 74)
+	punpckhqdq xmm4,xmm2		; xmm4=col5=(05 15 25 35 45 55 65 75)
+	movdqa     xmm7,xmm3		; transpose coefficients(phase 3)
+	punpcklqdq xmm3,xmm0		; xmm3=col6=(06 16 26 36 46 56 66 76)
+	punpckhqdq xmm7,xmm0		; xmm7=col7=(07 17 27 37 47 57 67 77)
+.column_end:
+
+	; -- Prefetch the next coefficient block
+
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
+
+	; ---- Pass 2: process rows from work array, store into output array.
+
+	mov	rax, [original_rbp]
+	mov	rdi, r12	; (JSAMPROW *)
+	mov	rax, r13
+
+	; -- Even part
+
+	; xmm6=col0, xmm5=col2, xmm1=col4, xmm3=col6
+
+	movdqa	xmm2,xmm6
+	movdqa	xmm0,xmm5
+	psubw	xmm6,xmm1		; xmm6=tmp11
+	psubw	xmm5,xmm3
+	paddw	xmm2,xmm1		; xmm2=tmp10
+	paddw	xmm0,xmm3		; xmm0=tmp13
+
+	psllw	xmm5,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm5,[PW_F1414]
+	psubw	xmm5,xmm0		; xmm5=tmp12
+
+	movdqa	xmm1,xmm2
+	movdqa	xmm3,xmm6
+	psubw	xmm2,xmm0		; xmm2=tmp3
+	psubw	xmm6,xmm5		; xmm6=tmp2
+	paddw	xmm1,xmm0		; xmm1=tmp0
+	paddw	xmm3,xmm5		; xmm3=tmp1
+
+	movdqa	xmm0, XMMWORD [wk(0)]	; xmm0=col1
+	movdqa	xmm5, XMMWORD [wk(1)]	; xmm5=col3
+
+	movdqa	XMMWORD [wk(0)], xmm2	; wk(0)=tmp3
+	movdqa	XMMWORD [wk(1)], xmm6	; wk(1)=tmp2
+
+	; -- Odd part
+
+	; xmm0=col1, xmm5=col3, xmm4=col5, xmm7=col7
+
+	movdqa	xmm2,xmm0
+	movdqa	xmm6,xmm4
+	psubw	xmm0,xmm7		; xmm0=z12
+	psubw	xmm4,xmm5		; xmm4=z10
+	paddw	xmm2,xmm7		; xmm2=z11
+	paddw	xmm6,xmm5		; xmm6=z13
+
+	movdqa	xmm7,xmm4		; xmm7=z10(unscaled)
+	psllw	xmm0,PRE_MULTIPLY_SCALE_BITS
+	psllw	xmm4,PRE_MULTIPLY_SCALE_BITS
+
+	movdqa	xmm5,xmm2
+	psubw	xmm2,xmm6
+	paddw	xmm5,xmm6		; xmm5=tmp7
+
+	psllw	xmm2,PRE_MULTIPLY_SCALE_BITS
+	pmulhw	xmm2,[PW_F1414]	; xmm2=tmp11
+
+	; To avoid overflow...
+	;
+	; (Original)
+	; tmp12 = -2.613125930 * z10 + z5;
+	;
+	; (This implementation)
+	; tmp12 = (-1.613125930 - 1) * z10 + z5;
+	;       = -1.613125930 * z10 - z10 + z5;
+
+	movdqa	xmm6,xmm4
+	paddw	xmm4,xmm0
+	pmulhw	xmm4,[PW_F1847]	; xmm4=z5
+	pmulhw	xmm6,[PW_MF1613]
+	pmulhw	xmm0,[PW_F1082]
+	psubw	xmm6,xmm7
+	psubw	xmm0,xmm4		; xmm0=tmp10
+	paddw	xmm6,xmm4		; xmm6=tmp12
+
+	; -- Final output stage
+
+	psubw	xmm6,xmm5		; xmm6=tmp6
+	movdqa	xmm7,xmm1
+	movdqa	xmm4,xmm3
+	paddw	xmm1,xmm5		; xmm1=data0=(00 10 20 30 40 50 60 70)
+	paddw	xmm3,xmm6		; xmm3=data1=(01 11 21 31 41 51 61 71)
+	psraw	xmm1,(PASS1_BITS+3)	; descale
+	psraw	xmm3,(PASS1_BITS+3)	; descale
+	psubw	xmm7,xmm5		; xmm7=data7=(07 17 27 37 47 57 67 77)
+	psubw	xmm4,xmm6		; xmm4=data6=(06 16 26 36 46 56 66 76)
+	psraw	xmm7,(PASS1_BITS+3)	; descale
+	psraw	xmm4,(PASS1_BITS+3)	; descale
+	psubw	xmm2,xmm6		; xmm2=tmp5
+
+	packsswb  xmm1,xmm4	; xmm1=(00 10 20 30 40 50 60 70 06 16 26 36 46 56 66 76)
+	packsswb  xmm3,xmm7	; xmm3=(01 11 21 31 41 51 61 71 07 17 27 37 47 57 67 77)
+
+	movdqa	xmm5, XMMWORD [wk(1)]	; xmm5=tmp2
+	movdqa	xmm6, XMMWORD [wk(0)]	; xmm6=tmp3
+
+	paddw	xmm0,xmm2		; xmm0=tmp4
+	movdqa	xmm4,xmm5
+	movdqa	xmm7,xmm6
+	paddw	xmm5,xmm2		; xmm5=data2=(02 12 22 32 42 52 62 72)
+	paddw	xmm6,xmm0		; xmm6=data4=(04 14 24 34 44 54 64 74)
+	psraw	xmm5,(PASS1_BITS+3)	; descale
+	psraw	xmm6,(PASS1_BITS+3)	; descale
+	psubw	xmm4,xmm2		; xmm4=data5=(05 15 25 35 45 55 65 75)
+	psubw	xmm7,xmm0		; xmm7=data3=(03 13 23 33 43 53 63 73)
+	psraw	xmm4,(PASS1_BITS+3)	; descale
+	psraw	xmm7,(PASS1_BITS+3)	; descale
+
+	movdqa    xmm2,[PB_CENTERJSAMP]	; xmm2=[PB_CENTERJSAMP]
+
+	packsswb  xmm5,xmm6	; xmm5=(02 12 22 32 42 52 62 72 04 14 24 34 44 54 64 74)
+	packsswb  xmm7,xmm4	; xmm7=(03 13 23 33 43 53 63 73 05 15 25 35 45 55 65 75)
+
+	paddb     xmm1,xmm2
+	paddb     xmm3,xmm2
+	paddb     xmm5,xmm2
+	paddb     xmm7,xmm2
+
+	movdqa    xmm0,xmm1	; transpose coefficients(phase 1)
+	punpcklbw xmm1,xmm3	; xmm1=(00 01 10 11 20 21 30 31 40 41 50 51 60 61 70 71)
+	punpckhbw xmm0,xmm3	; xmm0=(06 07 16 17 26 27 36 37 46 47 56 57 66 67 76 77)
+	movdqa    xmm6,xmm5	; transpose coefficients(phase 1)
+	punpcklbw xmm5,xmm7	; xmm5=(02 03 12 13 22 23 32 33 42 43 52 53 62 63 72 73)
+	punpckhbw xmm6,xmm7	; xmm6=(04 05 14 15 24 25 34 35 44 45 54 55 64 65 74 75)
+
+	movdqa    xmm4,xmm1	; transpose coefficients(phase 2)
+	punpcklwd xmm1,xmm5	; xmm1=(00 01 02 03 10 11 12 13 20 21 22 23 30 31 32 33)
+	punpckhwd xmm4,xmm5	; xmm4=(40 41 42 43 50 51 52 53 60 61 62 63 70 71 72 73)
+	movdqa    xmm2,xmm6	; transpose coefficients(phase 2)
+	punpcklwd xmm6,xmm0	; xmm6=(04 05 06 07 14 15 16 17 24 25 26 27 34 35 36 37)
+	punpckhwd xmm2,xmm0	; xmm2=(44 45 46 47 54 55 56 57 64 65 66 67 74 75 76 77)
+
+	movdqa    xmm3,xmm1	; transpose coefficients(phase 3)
+	punpckldq xmm1,xmm6	; xmm1=(00 01 02 03 04 05 06 07 10 11 12 13 14 15 16 17)
+	punpckhdq xmm3,xmm6	; xmm3=(20 21 22 23 24 25 26 27 30 31 32 33 34 35 36 37)
+	movdqa    xmm7,xmm4	; transpose coefficients(phase 3)
+	punpckldq xmm4,xmm2	; xmm4=(40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57)
+	punpckhdq xmm7,xmm2	; xmm7=(60 61 62 63 64 65 66 67 70 71 72 73 74 75 76 77)
+
+	pshufd	xmm5,xmm1,0x4E	; xmm5=(10 11 12 13 14 15 16 17 00 01 02 03 04 05 06 07)
+	pshufd	xmm0,xmm3,0x4E	; xmm0=(30 31 32 33 34 35 36 37 20 21 22 23 24 25 26 27)
+	pshufd	xmm6,xmm4,0x4E	; xmm6=(50 51 52 53 54 55 56 57 40 41 42 43 44 45 46 47)
+	pshufd	xmm2,xmm7,0x4E	; xmm2=(70 71 72 73 74 75 76 77 60 61 62 63 64 65 66 67)
+
+	mov	rdx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+2*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm1
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm3
+	mov	rdx, JSAMPROW [rdi+4*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+6*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm4
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm7
+
+	mov	rdx, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+3*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm5
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm0
+	mov	rdx, JSAMPROW [rdi+5*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+7*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm6
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm2
+
+	uncollect_args
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
+	ret
diff --git a/simd/jiss2int-64.asm b/simd/jiss2int-64.asm
new file mode 100644
index 0000000..cfeb42d
--- /dev/null
+++ b/simd/jiss2int-64.asm
@@ -0,0 +1,844 @@
+;
+; jiss2int.asm - accurate integer IDCT (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; This file contains a slow-but-accurate integer implementation of the
+; inverse DCT (Discrete Cosine Transform). The following code is based
+; directly on the IJG's original jidctint.c; see the jidctint.c for
+; more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%define CONST_BITS	13
+%define PASS1_BITS	2
+
+%define DESCALE_P1	(CONST_BITS-PASS1_BITS)
+%define DESCALE_P2	(CONST_BITS+PASS1_BITS+3)
+
+%if CONST_BITS == 13
+F_0_298	equ	 2446		; FIX(0.298631336)
+F_0_390	equ	 3196		; FIX(0.390180644)
+F_0_541	equ	 4433		; FIX(0.541196100)
+F_0_765	equ	 6270		; FIX(0.765366865)
+F_0_899	equ	 7373		; FIX(0.899976223)
+F_1_175	equ	 9633		; FIX(1.175875602)
+F_1_501	equ	12299		; FIX(1.501321110)
+F_1_847	equ	15137		; FIX(1.847759065)
+F_1_961	equ	16069		; FIX(1.961570560)
+F_2_053	equ	16819		; FIX(2.053119869)
+F_2_562	equ	20995		; FIX(2.562915447)
+F_3_072	equ	25172		; FIX(3.072711026)
+%else
+; NASM cannot do compile-time arithmetic on floating-point constants.
+%define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
+F_0_298	equ	DESCALE( 320652955,30-CONST_BITS)	; FIX(0.298631336)
+F_0_390	equ	DESCALE( 418953276,30-CONST_BITS)	; FIX(0.390180644)
+F_0_541	equ	DESCALE( 581104887,30-CONST_BITS)	; FIX(0.541196100)
+F_0_765	equ	DESCALE( 821806413,30-CONST_BITS)	; FIX(0.765366865)
+F_0_899	equ	DESCALE( 966342111,30-CONST_BITS)	; FIX(0.899976223)
+F_1_175	equ	DESCALE(1262586813,30-CONST_BITS)	; FIX(1.175875602)
+F_1_501	equ	DESCALE(1612031267,30-CONST_BITS)	; FIX(1.501321110)
+F_1_847	equ	DESCALE(1984016188,30-CONST_BITS)	; FIX(1.847759065)
+F_1_961	equ	DESCALE(2106220350,30-CONST_BITS)	; FIX(1.961570560)
+F_2_053	equ	DESCALE(2204520673,30-CONST_BITS)	; FIX(2.053119869)
+F_2_562	equ	DESCALE(2751909506,30-CONST_BITS)	; FIX(2.562915447)
+F_3_072	equ	DESCALE(3299298341,30-CONST_BITS)	; FIX(3.072711026)
+%endif
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_idct_islow_sse2)
+
+EXTN(jconst_idct_islow_sse2):
+
+PW_F130_F054	times 4 dw  (F_0_541+F_0_765), F_0_541
+PW_F054_MF130	times 4 dw  F_0_541, (F_0_541-F_1_847)
+PW_MF078_F117	times 4 dw  (F_1_175-F_1_961), F_1_175
+PW_F117_F078	times 4 dw  F_1_175, (F_1_175-F_0_390)
+PW_MF060_MF089	times 4 dw  (F_0_298-F_0_899),-F_0_899
+PW_MF089_F060	times 4 dw -F_0_899, (F_1_501-F_0_899)
+PW_MF050_MF256	times 4 dw  (F_2_053-F_2_562),-F_2_562
+PW_MF256_F050	times 4 dw -F_2_562, (F_3_072-F_2_562)
+PD_DESCALE_P1	times 4 dd  1 << (DESCALE_P1-1)
+PD_DESCALE_P2	times 4 dd  1 << (DESCALE_P2-1)
+PB_CENTERJSAMP	times 16 db CENTERJSAMPLE
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Perform dequantization and inverse DCT on one block of coefficients.
+;
+; GLOBAL(void)
+; jsimd_idct_islow_sse2 (void * dct_table, JCOEFPTR coef_block,
+;                        JSAMPARRAY output_buf, JDIMENSION output_col)
+;
+
+; r10 = jpeg_component_info * compptr
+; r11 = JCOEFPTR coef_block
+; r12 = JSAMPARRAY output_buf
+; r13 = JDIMENSION output_col
+
+%define original_rbp	rbp+0
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		12
+
+	align	16
+	global	EXTN(jsimd_idct_islow_sse2)
+
+EXTN(jsimd_idct_islow_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],rax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	collect_args
+
+	; ---- Pass 1: process columns from input.
+
+	mov	rdx, r10	; quantptr
+	mov	rsi, r11		; inptr
+
+%ifndef NO_ZERO_COLUMN_TEST_ISLOW_SSE2
+	mov	eax, DWORD [DWBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	or	eax, DWORD [DWBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	jnz	near .columnDCT
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1, XMMWORD [XMMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1,xmm0
+	packsswb xmm1,xmm1
+	packsswb xmm1,xmm1
+	movd	eax,xmm1
+	test	rax,rax
+	jnz	short .columnDCT
+
+	; -- AC terms all zero
+
+	movdqa	xmm5, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm5, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	psllw	xmm5,PASS1_BITS
+
+	movdqa    xmm4,xmm5		; xmm5=in0=(00 01 02 03 04 05 06 07)
+	punpcklwd xmm5,xmm5		; xmm5=(00 00 01 01 02 02 03 03)
+	punpckhwd xmm4,xmm4		; xmm4=(04 04 05 05 06 06 07 07)
+
+	pshufd	xmm7,xmm5,0x00		; xmm7=col0=(00 00 00 00 00 00 00 00)
+	pshufd	xmm6,xmm5,0x55		; xmm6=col1=(01 01 01 01 01 01 01 01)
+	pshufd	xmm1,xmm5,0xAA		; xmm1=col2=(02 02 02 02 02 02 02 02)
+	pshufd	xmm5,xmm5,0xFF		; xmm5=col3=(03 03 03 03 03 03 03 03)
+	pshufd	xmm0,xmm4,0x00		; xmm0=col4=(04 04 04 04 04 04 04 04)
+	pshufd	xmm3,xmm4,0x55		; xmm3=col5=(05 05 05 05 05 05 05 05)
+	pshufd	xmm2,xmm4,0xAA		; xmm2=col6=(06 06 06 06 06 06 06 06)
+	pshufd	xmm4,xmm4,0xFF		; xmm4=col7=(07 07 07 07 07 07 07 07)
+
+	movdqa	XMMWORD [wk(8)], xmm6	; wk(8)=col1
+	movdqa	XMMWORD [wk(9)], xmm5	; wk(9)=col3
+	movdqa	XMMWORD [wk(10)], xmm3	; wk(10)=col5
+	movdqa	XMMWORD [wk(11)], xmm4	; wk(11)=col7
+	jmp	near .column_end
+%endif
+.columnDCT:
+
+	; -- Even part
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm1, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	movdqa	xmm2, XMMWORD [XMMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm2, XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm3, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	; (Original)
+	; z1 = (z2 + z3) * 0.541196100;
+	; tmp2 = z1 + z3 * -1.847759065;
+	; tmp3 = z1 + z2 * 0.765366865;
+	;
+	; (This implementation)
+	; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
+	; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
+
+	movdqa    xmm4,xmm1		; xmm1=in2=z2
+	movdqa    xmm5,xmm1
+	punpcklwd xmm4,xmm3		; xmm3=in6=z3
+	punpckhwd xmm5,xmm3
+	movdqa    xmm1,xmm4
+	movdqa    xmm3,xmm5
+	pmaddwd   xmm4,[PW_F130_F054]	; xmm4=tmp3L
+	pmaddwd   xmm5,[PW_F130_F054]	; xmm5=tmp3H
+	pmaddwd   xmm1,[PW_F054_MF130]	; xmm1=tmp2L
+	pmaddwd   xmm3,[PW_F054_MF130]	; xmm3=tmp2H
+
+	movdqa    xmm6,xmm0
+	paddw     xmm0,xmm2		; xmm0=in0+in4
+	psubw     xmm6,xmm2		; xmm6=in0-in4
+
+	pxor      xmm7,xmm7
+	pxor      xmm2,xmm2
+	punpcklwd xmm7,xmm0		; xmm7=tmp0L
+	punpckhwd xmm2,xmm0		; xmm2=tmp0H
+	psrad     xmm7,(16-CONST_BITS)	; psrad xmm7,16 & pslld xmm7,CONST_BITS
+	psrad     xmm2,(16-CONST_BITS)	; psrad xmm2,16 & pslld xmm2,CONST_BITS
+
+	movdqa	xmm0,xmm7
+	paddd	xmm7,xmm4		; xmm7=tmp10L
+	psubd	xmm0,xmm4		; xmm0=tmp13L
+	movdqa	xmm4,xmm2
+	paddd	xmm2,xmm5		; xmm2=tmp10H
+	psubd	xmm4,xmm5		; xmm4=tmp13H
+
+	movdqa	XMMWORD [wk(0)], xmm7	; wk(0)=tmp10L
+	movdqa	XMMWORD [wk(1)], xmm2	; wk(1)=tmp10H
+	movdqa	XMMWORD [wk(2)], xmm0	; wk(2)=tmp13L
+	movdqa	XMMWORD [wk(3)], xmm4	; wk(3)=tmp13H
+
+	pxor      xmm5,xmm5
+	pxor      xmm7,xmm7
+	punpcklwd xmm5,xmm6		; xmm5=tmp1L
+	punpckhwd xmm7,xmm6		; xmm7=tmp1H
+	psrad     xmm5,(16-CONST_BITS)	; psrad xmm5,16 & pslld xmm5,CONST_BITS
+	psrad     xmm7,(16-CONST_BITS)	; psrad xmm7,16 & pslld xmm7,CONST_BITS
+
+	movdqa	xmm2,xmm5
+	paddd	xmm5,xmm1		; xmm5=tmp11L
+	psubd	xmm2,xmm1		; xmm2=tmp12L
+	movdqa	xmm0,xmm7
+	paddd	xmm7,xmm3		; xmm7=tmp11H
+	psubd	xmm0,xmm3		; xmm0=tmp12H
+
+	movdqa	XMMWORD [wk(4)], xmm5	; wk(4)=tmp11L
+	movdqa	XMMWORD [wk(5)], xmm7	; wk(5)=tmp11H
+	movdqa	XMMWORD [wk(6)], xmm2	; wk(6)=tmp12L
+	movdqa	XMMWORD [wk(7)], xmm0	; wk(7)=tmp12H
+
+	; -- Odd part
+
+	movdqa	xmm4, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm6, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm4, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm6, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm1, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	movdqa	xmm5,xmm6
+	movdqa	xmm7,xmm4
+	paddw	xmm5,xmm3		; xmm5=z3
+	paddw	xmm7,xmm1		; xmm7=z4
+
+	; (Original)
+	; z5 = (z3 + z4) * 1.175875602;
+	; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
+	; z3 += z5;  z4 += z5;
+	;
+	; (This implementation)
+	; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
+	; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
+
+	movdqa    xmm2,xmm5
+	movdqa    xmm0,xmm5
+	punpcklwd xmm2,xmm7
+	punpckhwd xmm0,xmm7
+	movdqa    xmm5,xmm2
+	movdqa    xmm7,xmm0
+	pmaddwd   xmm2,[PW_MF078_F117]	; xmm2=z3L
+	pmaddwd   xmm0,[PW_MF078_F117]	; xmm0=z3H
+	pmaddwd   xmm5,[PW_F117_F078]	; xmm5=z4L
+	pmaddwd   xmm7,[PW_F117_F078]	; xmm7=z4H
+
+	movdqa	XMMWORD [wk(10)], xmm2	; wk(10)=z3L
+	movdqa	XMMWORD [wk(11)], xmm0	; wk(11)=z3H
+
+	; (Original)
+	; z1 = tmp0 + tmp3;  z2 = tmp1 + tmp2;
+	; tmp0 = tmp0 * 0.298631336;  tmp1 = tmp1 * 2.053119869;
+	; tmp2 = tmp2 * 3.072711026;  tmp3 = tmp3 * 1.501321110;
+	; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
+	; tmp0 += z1 + z3;  tmp1 += z2 + z4;
+	; tmp2 += z2 + z3;  tmp3 += z1 + z4;
+	;
+	; (This implementation)
+	; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
+	; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
+	; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
+	; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
+	; tmp0 += z3;  tmp1 += z4;
+	; tmp2 += z3;  tmp3 += z4;
+
+	movdqa    xmm2,xmm3
+	movdqa    xmm0,xmm3
+	punpcklwd xmm2,xmm4
+	punpckhwd xmm0,xmm4
+	movdqa    xmm3,xmm2
+	movdqa    xmm4,xmm0
+	pmaddwd   xmm2,[PW_MF060_MF089]	; xmm2=tmp0L
+	pmaddwd   xmm0,[PW_MF060_MF089]	; xmm0=tmp0H
+	pmaddwd   xmm3,[PW_MF089_F060]	; xmm3=tmp3L
+	pmaddwd   xmm4,[PW_MF089_F060]	; xmm4=tmp3H
+
+	paddd	xmm2, XMMWORD [wk(10)]	; xmm2=tmp0L
+	paddd	xmm0, XMMWORD [wk(11)]	; xmm0=tmp0H
+	paddd	xmm3,xmm5		; xmm3=tmp3L
+	paddd	xmm4,xmm7		; xmm4=tmp3H
+
+	movdqa	XMMWORD [wk(8)], xmm2	; wk(8)=tmp0L
+	movdqa	XMMWORD [wk(9)], xmm0	; wk(9)=tmp0H
+
+	movdqa    xmm2,xmm1
+	movdqa    xmm0,xmm1
+	punpcklwd xmm2,xmm6
+	punpckhwd xmm0,xmm6
+	movdqa    xmm1,xmm2
+	movdqa    xmm6,xmm0
+	pmaddwd   xmm2,[PW_MF050_MF256]	; xmm2=tmp1L
+	pmaddwd   xmm0,[PW_MF050_MF256]	; xmm0=tmp1H
+	pmaddwd   xmm1,[PW_MF256_F050]	; xmm1=tmp2L
+	pmaddwd   xmm6,[PW_MF256_F050]	; xmm6=tmp2H
+
+	paddd	xmm2,xmm5		; xmm2=tmp1L
+	paddd	xmm0,xmm7		; xmm0=tmp1H
+	paddd	xmm1, XMMWORD [wk(10)]	; xmm1=tmp2L
+	paddd	xmm6, XMMWORD [wk(11)]	; xmm6=tmp2H
+
+	movdqa	XMMWORD [wk(10)], xmm2	; wk(10)=tmp1L
+	movdqa	XMMWORD [wk(11)], xmm0	; wk(11)=tmp1H
+
+	; -- Final output stage
+
+	movdqa	xmm5, XMMWORD [wk(0)]	; xmm5=tmp10L
+	movdqa	xmm7, XMMWORD [wk(1)]	; xmm7=tmp10H
+
+	movdqa	xmm2,xmm5
+	movdqa	xmm0,xmm7
+	paddd	xmm5,xmm3		; xmm5=data0L
+	paddd	xmm7,xmm4		; xmm7=data0H
+	psubd	xmm2,xmm3		; xmm2=data7L
+	psubd	xmm0,xmm4		; xmm0=data7H
+
+	movdqa	xmm3,[PD_DESCALE_P1]	; xmm3=[PD_DESCALE_P1]
+
+	paddd	xmm5,xmm3
+	paddd	xmm7,xmm3
+	psrad	xmm5,DESCALE_P1
+	psrad	xmm7,DESCALE_P1
+	paddd	xmm2,xmm3
+	paddd	xmm0,xmm3
+	psrad	xmm2,DESCALE_P1
+	psrad	xmm0,DESCALE_P1
+
+	packssdw  xmm5,xmm7		; xmm5=data0=(00 01 02 03 04 05 06 07)
+	packssdw  xmm2,xmm0		; xmm2=data7=(70 71 72 73 74 75 76 77)
+
+	movdqa	xmm4, XMMWORD [wk(4)]	; xmm4=tmp11L
+	movdqa	xmm3, XMMWORD [wk(5)]	; xmm3=tmp11H
+
+	movdqa	xmm7,xmm4
+	movdqa	xmm0,xmm3
+	paddd	xmm4,xmm1		; xmm4=data1L
+	paddd	xmm3,xmm6		; xmm3=data1H
+	psubd	xmm7,xmm1		; xmm7=data6L
+	psubd	xmm0,xmm6		; xmm0=data6H
+
+	movdqa	xmm1,[PD_DESCALE_P1]	; xmm1=[PD_DESCALE_P1]
+
+	paddd	xmm4,xmm1
+	paddd	xmm3,xmm1
+	psrad	xmm4,DESCALE_P1
+	psrad	xmm3,DESCALE_P1
+	paddd	xmm7,xmm1
+	paddd	xmm0,xmm1
+	psrad	xmm7,DESCALE_P1
+	psrad	xmm0,DESCALE_P1
+
+	packssdw  xmm4,xmm3		; xmm4=data1=(10 11 12 13 14 15 16 17)
+	packssdw  xmm7,xmm0		; xmm7=data6=(60 61 62 63 64 65 66 67)
+
+	movdqa    xmm6,xmm5		; transpose coefficients(phase 1)
+	punpcklwd xmm5,xmm4		; xmm5=(00 10 01 11 02 12 03 13)
+	punpckhwd xmm6,xmm4		; xmm6=(04 14 05 15 06 16 07 17)
+	movdqa    xmm1,xmm7		; transpose coefficients(phase 1)
+	punpcklwd xmm7,xmm2		; xmm7=(60 70 61 71 62 72 63 73)
+	punpckhwd xmm1,xmm2		; xmm1=(64 74 65 75 66 76 67 77)
+
+	movdqa	xmm3, XMMWORD [wk(6)]	; xmm3=tmp12L
+	movdqa	xmm0, XMMWORD [wk(7)]	; xmm0=tmp12H
+	movdqa	xmm4, XMMWORD [wk(10)]	; xmm4=tmp1L
+	movdqa	xmm2, XMMWORD [wk(11)]	; xmm2=tmp1H
+
+	movdqa	XMMWORD [wk(0)], xmm5	; wk(0)=(00 10 01 11 02 12 03 13)
+	movdqa	XMMWORD [wk(1)], xmm6	; wk(1)=(04 14 05 15 06 16 07 17)
+	movdqa	XMMWORD [wk(4)], xmm7	; wk(4)=(60 70 61 71 62 72 63 73)
+	movdqa	XMMWORD [wk(5)], xmm1	; wk(5)=(64 74 65 75 66 76 67 77)
+
+	movdqa	xmm5,xmm3
+	movdqa	xmm6,xmm0
+	paddd	xmm3,xmm4		; xmm3=data2L
+	paddd	xmm0,xmm2		; xmm0=data2H
+	psubd	xmm5,xmm4		; xmm5=data5L
+	psubd	xmm6,xmm2		; xmm6=data5H
+
+	movdqa	xmm7,[PD_DESCALE_P1]	; xmm7=[PD_DESCALE_P1]
+
+	paddd	xmm3,xmm7
+	paddd	xmm0,xmm7
+	psrad	xmm3,DESCALE_P1
+	psrad	xmm0,DESCALE_P1
+	paddd	xmm5,xmm7
+	paddd	xmm6,xmm7
+	psrad	xmm5,DESCALE_P1
+	psrad	xmm6,DESCALE_P1
+
+	packssdw  xmm3,xmm0		; xmm3=data2=(20 21 22 23 24 25 26 27)
+	packssdw  xmm5,xmm6		; xmm5=data5=(50 51 52 53 54 55 56 57)
+
+	movdqa	xmm1, XMMWORD [wk(2)]	; xmm1=tmp13L
+	movdqa	xmm4, XMMWORD [wk(3)]	; xmm4=tmp13H
+	movdqa	xmm2, XMMWORD [wk(8)]	; xmm2=tmp0L
+	movdqa	xmm7, XMMWORD [wk(9)]	; xmm7=tmp0H
+
+	movdqa	xmm0,xmm1
+	movdqa	xmm6,xmm4
+	paddd	xmm1,xmm2		; xmm1=data3L
+	paddd	xmm4,xmm7		; xmm4=data3H
+	psubd	xmm0,xmm2		; xmm0=data4L
+	psubd	xmm6,xmm7		; xmm6=data4H
+
+	movdqa	xmm2,[PD_DESCALE_P1]	; xmm2=[PD_DESCALE_P1]
+
+	paddd	xmm1,xmm2
+	paddd	xmm4,xmm2
+	psrad	xmm1,DESCALE_P1
+	psrad	xmm4,DESCALE_P1
+	paddd	xmm0,xmm2
+	paddd	xmm6,xmm2
+	psrad	xmm0,DESCALE_P1
+	psrad	xmm6,DESCALE_P1
+
+	packssdw  xmm1,xmm4		; xmm1=data3=(30 31 32 33 34 35 36 37)
+	packssdw  xmm0,xmm6		; xmm0=data4=(40 41 42 43 44 45 46 47)
+
+	movdqa	xmm7, XMMWORD [wk(0)]	; xmm7=(00 10 01 11 02 12 03 13)
+	movdqa	xmm2, XMMWORD [wk(1)]	; xmm2=(04 14 05 15 06 16 07 17)
+
+	movdqa    xmm4,xmm3		; transpose coefficients(phase 1)
+	punpcklwd xmm3,xmm1		; xmm3=(20 30 21 31 22 32 23 33)
+	punpckhwd xmm4,xmm1		; xmm4=(24 34 25 35 26 36 27 37)
+	movdqa    xmm6,xmm0		; transpose coefficients(phase 1)
+	punpcklwd xmm0,xmm5		; xmm0=(40 50 41 51 42 52 43 53)
+	punpckhwd xmm6,xmm5		; xmm6=(44 54 45 55 46 56 47 57)
+
+	movdqa    xmm1,xmm7		; transpose coefficients(phase 2)
+	punpckldq xmm7,xmm3		; xmm7=(00 10 20 30 01 11 21 31)
+	punpckhdq xmm1,xmm3		; xmm1=(02 12 22 32 03 13 23 33)
+	movdqa    xmm5,xmm2		; transpose coefficients(phase 2)
+	punpckldq xmm2,xmm4		; xmm2=(04 14 24 34 05 15 25 35)
+	punpckhdq xmm5,xmm4		; xmm5=(06 16 26 36 07 17 27 37)
+
+	movdqa	xmm3, XMMWORD [wk(4)]	; xmm3=(60 70 61 71 62 72 63 73)
+	movdqa	xmm4, XMMWORD [wk(5)]	; xmm4=(64 74 65 75 66 76 67 77)
+
+	movdqa	XMMWORD [wk(6)], xmm2	; wk(6)=(04 14 24 34 05 15 25 35)
+	movdqa	XMMWORD [wk(7)], xmm5	; wk(7)=(06 16 26 36 07 17 27 37)
+
+	movdqa    xmm2,xmm0		; transpose coefficients(phase 2)
+	punpckldq xmm0,xmm3		; xmm0=(40 50 60 70 41 51 61 71)
+	punpckhdq xmm2,xmm3		; xmm2=(42 52 62 72 43 53 63 73)
+	movdqa    xmm5,xmm6		; transpose coefficients(phase 2)
+	punpckldq xmm6,xmm4		; xmm6=(44 54 64 74 45 55 65 75)
+	punpckhdq xmm5,xmm4		; xmm5=(46 56 66 76 47 57 67 77)
+
+	movdqa     xmm3,xmm7		; transpose coefficients(phase 3)
+	punpcklqdq xmm7,xmm0		; xmm7=col0=(00 10 20 30 40 50 60 70)
+	punpckhqdq xmm3,xmm0		; xmm3=col1=(01 11 21 31 41 51 61 71)
+	movdqa     xmm4,xmm1		; transpose coefficients(phase 3)
+	punpcklqdq xmm1,xmm2		; xmm1=col2=(02 12 22 32 42 52 62 72)
+	punpckhqdq xmm4,xmm2		; xmm4=col3=(03 13 23 33 43 53 63 73)
+
+	movdqa	xmm0, XMMWORD [wk(6)]	; xmm0=(04 14 24 34 05 15 25 35)
+	movdqa	xmm2, XMMWORD [wk(7)]	; xmm2=(06 16 26 36 07 17 27 37)
+
+	movdqa	XMMWORD [wk(8)], xmm3	; wk(8)=col1
+	movdqa	XMMWORD [wk(9)], xmm4	; wk(9)=col3
+
+	movdqa     xmm3,xmm0		; transpose coefficients(phase 3)
+	punpcklqdq xmm0,xmm6		; xmm0=col4=(04 14 24 34 44 54 64 74)
+	punpckhqdq xmm3,xmm6		; xmm3=col5=(05 15 25 35 45 55 65 75)
+	movdqa     xmm4,xmm2		; transpose coefficients(phase 3)
+	punpcklqdq xmm2,xmm5		; xmm2=col6=(06 16 26 36 46 56 66 76)
+	punpckhqdq xmm4,xmm5		; xmm4=col7=(07 17 27 37 47 57 67 77)
+
+	movdqa	XMMWORD [wk(10)], xmm3	; wk(10)=col5
+	movdqa	XMMWORD [wk(11)], xmm4	; wk(11)=col7
+.column_end:
+
+	; -- Prefetch the next coefficient block
+
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
+
+	; ---- Pass 2: process rows from work array, store into output array.
+
+	mov	rax, [original_rbp]
+	mov	rdi, r12	; (JSAMPROW *)
+	mov	rax, r13
+
+	; -- Even part
+
+	; xmm7=col0, xmm1=col2, xmm0=col4, xmm2=col6
+
+	; (Original)
+	; z1 = (z2 + z3) * 0.541196100;
+	; tmp2 = z1 + z3 * -1.847759065;
+	; tmp3 = z1 + z2 * 0.765366865;
+	;
+	; (This implementation)
+	; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
+	; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
+
+	movdqa    xmm6,xmm1		; xmm1=in2=z2
+	movdqa    xmm5,xmm1
+	punpcklwd xmm6,xmm2		; xmm2=in6=z3
+	punpckhwd xmm5,xmm2
+	movdqa    xmm1,xmm6
+	movdqa    xmm2,xmm5
+	pmaddwd   xmm6,[PW_F130_F054]	; xmm6=tmp3L
+	pmaddwd   xmm5,[PW_F130_F054]	; xmm5=tmp3H
+	pmaddwd   xmm1,[PW_F054_MF130]	; xmm1=tmp2L
+	pmaddwd   xmm2,[PW_F054_MF130]	; xmm2=tmp2H
+
+	movdqa    xmm3,xmm7
+	paddw     xmm7,xmm0		; xmm7=in0+in4
+	psubw     xmm3,xmm0		; xmm3=in0-in4
+
+	pxor      xmm4,xmm4
+	pxor      xmm0,xmm0
+	punpcklwd xmm4,xmm7		; xmm4=tmp0L
+	punpckhwd xmm0,xmm7		; xmm0=tmp0H
+	psrad     xmm4,(16-CONST_BITS)	; psrad xmm4,16 & pslld xmm4,CONST_BITS
+	psrad     xmm0,(16-CONST_BITS)	; psrad xmm0,16 & pslld xmm0,CONST_BITS
+
+	movdqa	xmm7,xmm4
+	paddd	xmm4,xmm6		; xmm4=tmp10L
+	psubd	xmm7,xmm6		; xmm7=tmp13L
+	movdqa	xmm6,xmm0
+	paddd	xmm0,xmm5		; xmm0=tmp10H
+	psubd	xmm6,xmm5		; xmm6=tmp13H
+
+	movdqa	XMMWORD [wk(0)], xmm4	; wk(0)=tmp10L
+	movdqa	XMMWORD [wk(1)], xmm0	; wk(1)=tmp10H
+	movdqa	XMMWORD [wk(2)], xmm7	; wk(2)=tmp13L
+	movdqa	XMMWORD [wk(3)], xmm6	; wk(3)=tmp13H
+
+	pxor      xmm5,xmm5
+	pxor      xmm4,xmm4
+	punpcklwd xmm5,xmm3		; xmm5=tmp1L
+	punpckhwd xmm4,xmm3		; xmm4=tmp1H
+	psrad     xmm5,(16-CONST_BITS)	; psrad xmm5,16 & pslld xmm5,CONST_BITS
+	psrad     xmm4,(16-CONST_BITS)	; psrad xmm4,16 & pslld xmm4,CONST_BITS
+
+	movdqa	xmm0,xmm5
+	paddd	xmm5,xmm1		; xmm5=tmp11L
+	psubd	xmm0,xmm1		; xmm0=tmp12L
+	movdqa	xmm7,xmm4
+	paddd	xmm4,xmm2		; xmm4=tmp11H
+	psubd	xmm7,xmm2		; xmm7=tmp12H
+
+	movdqa	XMMWORD [wk(4)], xmm5	; wk(4)=tmp11L
+	movdqa	XMMWORD [wk(5)], xmm4	; wk(5)=tmp11H
+	movdqa	XMMWORD [wk(6)], xmm0	; wk(6)=tmp12L
+	movdqa	XMMWORD [wk(7)], xmm7	; wk(7)=tmp12H
+
+	; -- Odd part
+
+	movdqa	xmm6, XMMWORD [wk(9)]	; xmm6=col3
+	movdqa	xmm3, XMMWORD [wk(8)]	; xmm3=col1
+	movdqa	xmm1, XMMWORD [wk(11)]	; xmm1=col7
+	movdqa	xmm2, XMMWORD [wk(10)]	; xmm2=col5
+
+	movdqa	xmm5,xmm6
+	movdqa	xmm4,xmm3
+	paddw	xmm5,xmm1		; xmm5=z3
+	paddw	xmm4,xmm2		; xmm4=z4
+
+	; (Original)
+	; z5 = (z3 + z4) * 1.175875602;
+	; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
+	; z3 += z5;  z4 += z5;
+	;
+	; (This implementation)
+	; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
+	; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
+
+	movdqa    xmm0,xmm5
+	movdqa    xmm7,xmm5
+	punpcklwd xmm0,xmm4
+	punpckhwd xmm7,xmm4
+	movdqa    xmm5,xmm0
+	movdqa    xmm4,xmm7
+	pmaddwd   xmm0,[PW_MF078_F117]	; xmm0=z3L
+	pmaddwd   xmm7,[PW_MF078_F117]	; xmm7=z3H
+	pmaddwd   xmm5,[PW_F117_F078]	; xmm5=z4L
+	pmaddwd   xmm4,[PW_F117_F078]	; xmm4=z4H
+
+	movdqa	XMMWORD [wk(10)], xmm0	; wk(10)=z3L
+	movdqa	XMMWORD [wk(11)], xmm7	; wk(11)=z3H
+
+	; (Original)
+	; z1 = tmp0 + tmp3;  z2 = tmp1 + tmp2;
+	; tmp0 = tmp0 * 0.298631336;  tmp1 = tmp1 * 2.053119869;
+	; tmp2 = tmp2 * 3.072711026;  tmp3 = tmp3 * 1.501321110;
+	; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
+	; tmp0 += z1 + z3;  tmp1 += z2 + z4;
+	; tmp2 += z2 + z3;  tmp3 += z1 + z4;
+	;
+	; (This implementation)
+	; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
+	; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
+	; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
+	; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
+	; tmp0 += z3;  tmp1 += z4;
+	; tmp2 += z3;  tmp3 += z4;
+
+	movdqa    xmm0,xmm1
+	movdqa    xmm7,xmm1
+	punpcklwd xmm0,xmm3
+	punpckhwd xmm7,xmm3
+	movdqa    xmm1,xmm0
+	movdqa    xmm3,xmm7
+	pmaddwd   xmm0,[PW_MF060_MF089]	; xmm0=tmp0L
+	pmaddwd   xmm7,[PW_MF060_MF089]	; xmm7=tmp0H
+	pmaddwd   xmm1,[PW_MF089_F060]	; xmm1=tmp3L
+	pmaddwd   xmm3,[PW_MF089_F060]	; xmm3=tmp3H
+
+	paddd	xmm0, XMMWORD [wk(10)]	; xmm0=tmp0L
+	paddd	xmm7, XMMWORD [wk(11)]	; xmm7=tmp0H
+	paddd	xmm1,xmm5		; xmm1=tmp3L
+	paddd	xmm3,xmm4		; xmm3=tmp3H
+
+	movdqa	XMMWORD [wk(8)], xmm0	; wk(8)=tmp0L
+	movdqa	XMMWORD [wk(9)], xmm7	; wk(9)=tmp0H
+
+	movdqa    xmm0,xmm2
+	movdqa    xmm7,xmm2
+	punpcklwd xmm0,xmm6
+	punpckhwd xmm7,xmm6
+	movdqa    xmm2,xmm0
+	movdqa    xmm6,xmm7
+	pmaddwd   xmm0,[PW_MF050_MF256]	; xmm0=tmp1L
+	pmaddwd   xmm7,[PW_MF050_MF256]	; xmm7=tmp1H
+	pmaddwd   xmm2,[PW_MF256_F050]	; xmm2=tmp2L
+	pmaddwd   xmm6,[PW_MF256_F050]	; xmm6=tmp2H
+
+	paddd	xmm0,xmm5		; xmm0=tmp1L
+	paddd	xmm7,xmm4		; xmm7=tmp1H
+	paddd	xmm2, XMMWORD [wk(10)]	; xmm2=tmp2L
+	paddd	xmm6, XMMWORD [wk(11)]	; xmm6=tmp2H
+
+	movdqa	XMMWORD [wk(10)], xmm0	; wk(10)=tmp1L
+	movdqa	XMMWORD [wk(11)], xmm7	; wk(11)=tmp1H
+
+	; -- Final output stage
+
+	movdqa	xmm5, XMMWORD [wk(0)]	; xmm5=tmp10L
+	movdqa	xmm4, XMMWORD [wk(1)]	; xmm4=tmp10H
+
+	movdqa	xmm0,xmm5
+	movdqa	xmm7,xmm4
+	paddd	xmm5,xmm1		; xmm5=data0L
+	paddd	xmm4,xmm3		; xmm4=data0H
+	psubd	xmm0,xmm1		; xmm0=data7L
+	psubd	xmm7,xmm3		; xmm7=data7H
+
+	movdqa	xmm1,[PD_DESCALE_P2]	; xmm1=[PD_DESCALE_P2]
+
+	paddd	xmm5,xmm1
+	paddd	xmm4,xmm1
+	psrad	xmm5,DESCALE_P2
+	psrad	xmm4,DESCALE_P2
+	paddd	xmm0,xmm1
+	paddd	xmm7,xmm1
+	psrad	xmm0,DESCALE_P2
+	psrad	xmm7,DESCALE_P2
+
+	packssdw  xmm5,xmm4		; xmm5=data0=(00 10 20 30 40 50 60 70)
+	packssdw  xmm0,xmm7		; xmm0=data7=(07 17 27 37 47 57 67 77)
+
+	movdqa	xmm3, XMMWORD [wk(4)]	; xmm3=tmp11L
+	movdqa	xmm1, XMMWORD [wk(5)]	; xmm1=tmp11H
+
+	movdqa	xmm4,xmm3
+	movdqa	xmm7,xmm1
+	paddd	xmm3,xmm2		; xmm3=data1L
+	paddd	xmm1,xmm6		; xmm1=data1H
+	psubd	xmm4,xmm2		; xmm4=data6L
+	psubd	xmm7,xmm6		; xmm7=data6H
+
+	movdqa	xmm2,[PD_DESCALE_P2]	; xmm2=[PD_DESCALE_P2]
+
+	paddd	xmm3,xmm2
+	paddd	xmm1,xmm2
+	psrad	xmm3,DESCALE_P2
+	psrad	xmm1,DESCALE_P2
+	paddd	xmm4,xmm2
+	paddd	xmm7,xmm2
+	psrad	xmm4,DESCALE_P2
+	psrad	xmm7,DESCALE_P2
+
+	packssdw  xmm3,xmm1		; xmm3=data1=(01 11 21 31 41 51 61 71)
+	packssdw  xmm4,xmm7		; xmm4=data6=(06 16 26 36 46 56 66 76)
+
+	packsswb  xmm5,xmm4		; xmm5=(00 10 20 30 40 50 60 70 06 16 26 36 46 56 66 76)
+	packsswb  xmm3,xmm0		; xmm3=(01 11 21 31 41 51 61 71 07 17 27 37 47 57 67 77)
+
+	movdqa	xmm6, XMMWORD [wk(6)]	; xmm6=tmp12L
+	movdqa	xmm2, XMMWORD [wk(7)]	; xmm2=tmp12H
+	movdqa	xmm1, XMMWORD [wk(10)]	; xmm1=tmp1L
+	movdqa	xmm7, XMMWORD [wk(11)]	; xmm7=tmp1H
+
+	movdqa	XMMWORD [wk(0)], xmm5	; wk(0)=(00 10 20 30 40 50 60 70 06 16 26 36 46 56 66 76)
+	movdqa	XMMWORD [wk(1)], xmm3	; wk(1)=(01 11 21 31 41 51 61 71 07 17 27 37 47 57 67 77)
+
+	movdqa	xmm4,xmm6
+	movdqa	xmm0,xmm2
+	paddd	xmm6,xmm1		; xmm6=data2L
+	paddd	xmm2,xmm7		; xmm2=data2H
+	psubd	xmm4,xmm1		; xmm4=data5L
+	psubd	xmm0,xmm7		; xmm0=data5H
+
+	movdqa	xmm5,[PD_DESCALE_P2]	; xmm5=[PD_DESCALE_P2]
+
+	paddd	xmm6,xmm5
+	paddd	xmm2,xmm5
+	psrad	xmm6,DESCALE_P2
+	psrad	xmm2,DESCALE_P2
+	paddd	xmm4,xmm5
+	paddd	xmm0,xmm5
+	psrad	xmm4,DESCALE_P2
+	psrad	xmm0,DESCALE_P2
+
+	packssdw  xmm6,xmm2		; xmm6=data2=(02 12 22 32 42 52 62 72)
+	packssdw  xmm4,xmm0		; xmm4=data5=(05 15 25 35 45 55 65 75)
+
+	movdqa	xmm3, XMMWORD [wk(2)]	; xmm3=tmp13L
+	movdqa	xmm1, XMMWORD [wk(3)]	; xmm1=tmp13H
+	movdqa	xmm7, XMMWORD [wk(8)]	; xmm7=tmp0L
+	movdqa	xmm5, XMMWORD [wk(9)]	; xmm5=tmp0H
+
+	movdqa	xmm2,xmm3
+	movdqa	xmm0,xmm1
+	paddd	xmm3,xmm7		; xmm3=data3L
+	paddd	xmm1,xmm5		; xmm1=data3H
+	psubd	xmm2,xmm7		; xmm2=data4L
+	psubd	xmm0,xmm5		; xmm0=data4H
+
+	movdqa	xmm7,[PD_DESCALE_P2]	; xmm7=[PD_DESCALE_P2]
+
+	paddd	xmm3,xmm7
+	paddd	xmm1,xmm7
+	psrad	xmm3,DESCALE_P2
+	psrad	xmm1,DESCALE_P2
+	paddd	xmm2,xmm7
+	paddd	xmm0,xmm7
+	psrad	xmm2,DESCALE_P2
+	psrad	xmm0,DESCALE_P2
+
+	movdqa    xmm5,[PB_CENTERJSAMP]	; xmm5=[PB_CENTERJSAMP]
+
+	packssdw  xmm3,xmm1		; xmm3=data3=(03 13 23 33 43 53 63 73)
+	packssdw  xmm2,xmm0		; xmm2=data4=(04 14 24 34 44 54 64 74)
+
+	movdqa    xmm7, XMMWORD [wk(0)]	; xmm7=(00 10 20 30 40 50 60 70 06 16 26 36 46 56 66 76)
+	movdqa    xmm1, XMMWORD [wk(1)]	; xmm1=(01 11 21 31 41 51 61 71 07 17 27 37 47 57 67 77)
+
+	packsswb  xmm6,xmm2		; xmm6=(02 12 22 32 42 52 62 72 04 14 24 34 44 54 64 74)
+	packsswb  xmm3,xmm4		; xmm3=(03 13 23 33 43 53 63 73 05 15 25 35 45 55 65 75)
+
+	paddb     xmm7,xmm5
+	paddb     xmm1,xmm5
+	paddb     xmm6,xmm5
+	paddb     xmm3,xmm5
+
+	movdqa    xmm0,xmm7	; transpose coefficients(phase 1)
+	punpcklbw xmm7,xmm1	; xmm7=(00 01 10 11 20 21 30 31 40 41 50 51 60 61 70 71)
+	punpckhbw xmm0,xmm1	; xmm0=(06 07 16 17 26 27 36 37 46 47 56 57 66 67 76 77)
+	movdqa    xmm2,xmm6	; transpose coefficients(phase 1)
+	punpcklbw xmm6,xmm3	; xmm6=(02 03 12 13 22 23 32 33 42 43 52 53 62 63 72 73)
+	punpckhbw xmm2,xmm3	; xmm2=(04 05 14 15 24 25 34 35 44 45 54 55 64 65 74 75)
+
+	movdqa    xmm4,xmm7	; transpose coefficients(phase 2)
+	punpcklwd xmm7,xmm6	; xmm7=(00 01 02 03 10 11 12 13 20 21 22 23 30 31 32 33)
+	punpckhwd xmm4,xmm6	; xmm4=(40 41 42 43 50 51 52 53 60 61 62 63 70 71 72 73)
+	movdqa    xmm5,xmm2	; transpose coefficients(phase 2)
+	punpcklwd xmm2,xmm0	; xmm2=(04 05 06 07 14 15 16 17 24 25 26 27 34 35 36 37)
+	punpckhwd xmm5,xmm0	; xmm5=(44 45 46 47 54 55 56 57 64 65 66 67 74 75 76 77)
+
+	movdqa    xmm1,xmm7	; transpose coefficients(phase 3)
+	punpckldq xmm7,xmm2	; xmm7=(00 01 02 03 04 05 06 07 10 11 12 13 14 15 16 17)
+	punpckhdq xmm1,xmm2	; xmm1=(20 21 22 23 24 25 26 27 30 31 32 33 34 35 36 37)
+	movdqa    xmm3,xmm4	; transpose coefficients(phase 3)
+	punpckldq xmm4,xmm5	; xmm4=(40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57)
+	punpckhdq xmm3,xmm5	; xmm3=(60 61 62 63 64 65 66 67 70 71 72 73 74 75 76 77)
+
+	pshufd	xmm6,xmm7,0x4E	; xmm6=(10 11 12 13 14 15 16 17 00 01 02 03 04 05 06 07)
+	pshufd	xmm0,xmm1,0x4E	; xmm0=(30 31 32 33 34 35 36 37 20 21 22 23 24 25 26 27)
+	pshufd	xmm2,xmm4,0x4E	; xmm2=(50 51 52 53 54 55 56 57 40 41 42 43 44 45 46 47)
+	pshufd	xmm5,xmm3,0x4E	; xmm5=(70 71 72 73 74 75 76 77 60 61 62 63 64 65 66 67)
+
+	mov	rdx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+2*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm7
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm1
+	mov	rdx, JSAMPROW [rdi+4*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+6*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm4
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm3
+
+	mov	rdx, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+3*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm6
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm0
+	mov	rdx, JSAMPROW [rdi+5*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+7*SIZEOF_JSAMPROW]
+	movq	XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm2
+	movq	XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm5
+
+	uncollect_args
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
diff --git a/simd/jiss2red-64.asm b/simd/jiss2red-64.asm
new file mode 100644
index 0000000..381180c
--- /dev/null
+++ b/simd/jiss2red-64.asm
@@ -0,0 +1,571 @@
+;
+; jiss2red.asm - reduced-size IDCT (64-bit SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; This file contains inverse-DCT routines that produce reduced-size
+; output: either 4x4 or 2x2 pixels from an 8x8 DCT block.
+; The following code is based directly on the IJG's original jidctred.c;
+; see the jidctred.c for more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%define CONST_BITS	13
+%define PASS1_BITS	2
+
+%define DESCALE_P1_4	(CONST_BITS-PASS1_BITS+1)
+%define DESCALE_P2_4	(CONST_BITS+PASS1_BITS+3+1)
+%define DESCALE_P1_2	(CONST_BITS-PASS1_BITS+2)
+%define DESCALE_P2_2	(CONST_BITS+PASS1_BITS+3+2)
+
+%if CONST_BITS == 13
+F_0_211	equ	 1730		; FIX(0.211164243)
+F_0_509	equ	 4176		; FIX(0.509795579)
+F_0_601	equ	 4926		; FIX(0.601344887)
+F_0_720	equ	 5906		; FIX(0.720959822)
+F_0_765	equ	 6270		; FIX(0.765366865)
+F_0_850	equ	 6967		; FIX(0.850430095)
+F_0_899	equ	 7373		; FIX(0.899976223)
+F_1_061	equ	 8697		; FIX(1.061594337)
+F_1_272	equ	10426		; FIX(1.272758580)
+F_1_451	equ	11893		; FIX(1.451774981)
+F_1_847	equ	15137		; FIX(1.847759065)
+F_2_172	equ	17799		; FIX(2.172734803)
+F_2_562	equ	20995		; FIX(2.562915447)
+F_3_624	equ	29692		; FIX(3.624509785)
+%else
+; NASM cannot do compile-time arithmetic on floating-point constants.
+%define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
+F_0_211	equ	DESCALE( 226735879,30-CONST_BITS)	; FIX(0.211164243)
+F_0_509	equ	DESCALE( 547388834,30-CONST_BITS)	; FIX(0.509795579)
+F_0_601	equ	DESCALE( 645689155,30-CONST_BITS)	; FIX(0.601344887)
+F_0_720	equ	DESCALE( 774124714,30-CONST_BITS)	; FIX(0.720959822)
+F_0_765	equ	DESCALE( 821806413,30-CONST_BITS)	; FIX(0.765366865)
+F_0_850	equ	DESCALE( 913142361,30-CONST_BITS)	; FIX(0.850430095)
+F_0_899	equ	DESCALE( 966342111,30-CONST_BITS)	; FIX(0.899976223)
+F_1_061	equ	DESCALE(1139878239,30-CONST_BITS)	; FIX(1.061594337)
+F_1_272	equ	DESCALE(1366614119,30-CONST_BITS)	; FIX(1.272758580)
+F_1_451	equ	DESCALE(1558831516,30-CONST_BITS)	; FIX(1.451774981)
+F_1_847	equ	DESCALE(1984016188,30-CONST_BITS)	; FIX(1.847759065)
+F_2_172	equ	DESCALE(2332956230,30-CONST_BITS)	; FIX(2.172734803)
+F_2_562	equ	DESCALE(2751909506,30-CONST_BITS)	; FIX(2.562915447)
+F_3_624	equ	DESCALE(3891787747,30-CONST_BITS)	; FIX(3.624509785)
+%endif
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_CONST
+
+	alignz	16
+	global	EXTN(jconst_idct_red_sse2)
+
+EXTN(jconst_idct_red_sse2):
+
+PW_F184_MF076	times 4 dw  F_1_847,-F_0_765
+PW_F256_F089	times 4 dw  F_2_562, F_0_899
+PW_F106_MF217	times 4 dw  F_1_061,-F_2_172
+PW_MF060_MF050	times 4 dw -F_0_601,-F_0_509
+PW_F145_MF021	times 4 dw  F_1_451,-F_0_211
+PW_F362_MF127	times 4 dw  F_3_624,-F_1_272
+PW_F085_MF072	times 4 dw  F_0_850,-F_0_720
+PD_DESCALE_P1_4	times 4 dd  1 << (DESCALE_P1_4-1)
+PD_DESCALE_P2_4	times 4 dd  1 << (DESCALE_P2_4-1)
+PD_DESCALE_P1_2	times 4 dd  1 << (DESCALE_P1_2-1)
+PD_DESCALE_P2_2	times 4 dd  1 << (DESCALE_P2_2-1)
+PB_CENTERJSAMP	times 16 db CENTERJSAMPLE
+
+	alignz	16
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Perform dequantization and inverse DCT on one block of coefficients,
+; producing a reduced-size 4x4 output block.
+;
+; GLOBAL(void)
+; jsimd_idct_4x4_sse2 (void * dct_table, JCOEFPTR coef_block,
+;                      JSAMPARRAY output_buf, JDIMENSION output_col)
+;
+
+; r10 = void * dct_table
+; r11 = JCOEFPTR coef_block
+; r12 = JSAMPARRAY output_buf
+; r13 = JDIMENSION output_col
+
+%define original_rbp	rbp+0
+%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
+%define WK_NUM		2
+
+	align	16
+	global	EXTN(jsimd_idct_4x4_sse2)
+
+EXTN(jsimd_idct_4x4_sse2):
+	push	rbp
+	mov	rax,rsp				; rax = original rbp
+	sub	rsp, byte 4
+	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
+	mov	[rsp],eax
+	mov	rbp,rsp				; rbp = aligned rbp
+	lea	rsp, [wk(0)]
+	collect_args
+
+	; ---- Pass 1: process columns from input.
+
+	mov	rdx, r10	; quantptr
+	mov	rsi, r11		; inptr
+
+%ifndef NO_ZERO_COLUMN_TEST_4X4_SSE2
+	mov	eax, DWORD [DWBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	or	eax, DWORD [DWBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	jnz	short .columnDCT
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+	por	xmm1, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	por	xmm0,xmm1
+	packsswb xmm0,xmm0
+	packsswb xmm0,xmm0
+	movd	eax,xmm0
+	test	rax,rax
+	jnz	short .columnDCT
+
+	; -- AC terms all zero
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	psllw	xmm0,PASS1_BITS
+
+	movdqa    xmm3,xmm0	; xmm0=in0=(00 01 02 03 04 05 06 07)
+	punpcklwd xmm0,xmm0	; xmm0=(00 00 01 01 02 02 03 03)
+	punpckhwd xmm3,xmm3	; xmm3=(04 04 05 05 06 06 07 07)
+
+	pshufd	xmm1,xmm0,0x50	; xmm1=[col0 col1]=(00 00 00 00 01 01 01 01)
+	pshufd	xmm0,xmm0,0xFA	; xmm0=[col2 col3]=(02 02 02 02 03 03 03 03)
+	pshufd	xmm6,xmm3,0x50	; xmm6=[col4 col5]=(04 04 04 04 05 05 05 05)
+	pshufd	xmm3,xmm3,0xFA	; xmm3=[col6 col7]=(06 06 06 06 07 07 07 07)
+
+	jmp	near .column_end
+%endif
+.columnDCT:
+
+	; -- Odd part
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm0, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm1, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	movdqa	xmm2, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm2, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	movdqa    xmm4,xmm0
+	movdqa    xmm5,xmm0
+	punpcklwd xmm4,xmm1
+	punpckhwd xmm5,xmm1
+	movdqa    xmm0,xmm4
+	movdqa    xmm1,xmm5
+	pmaddwd   xmm4,[PW_F256_F089]	; xmm4=(tmp2L)
+	pmaddwd   xmm5,[PW_F256_F089]	; xmm5=(tmp2H)
+	pmaddwd   xmm0,[PW_F106_MF217]	; xmm0=(tmp0L)
+	pmaddwd   xmm1,[PW_F106_MF217]	; xmm1=(tmp0H)
+
+	movdqa    xmm6,xmm2
+	movdqa    xmm7,xmm2
+	punpcklwd xmm6,xmm3
+	punpckhwd xmm7,xmm3
+	movdqa    xmm2,xmm6
+	movdqa    xmm3,xmm7
+	pmaddwd   xmm6,[PW_MF060_MF050]	; xmm6=(tmp2L)
+	pmaddwd   xmm7,[PW_MF060_MF050]	; xmm7=(tmp2H)
+	pmaddwd   xmm2,[PW_F145_MF021]	; xmm2=(tmp0L)
+	pmaddwd   xmm3,[PW_F145_MF021]	; xmm3=(tmp0H)
+
+	paddd	xmm6,xmm4		; xmm6=tmp2L
+	paddd	xmm7,xmm5		; xmm7=tmp2H
+	paddd	xmm2,xmm0		; xmm2=tmp0L
+	paddd	xmm3,xmm1		; xmm3=tmp0H
+
+	movdqa	XMMWORD [wk(0)], xmm2	; wk(0)=tmp0L
+	movdqa	XMMWORD [wk(1)], xmm3	; wk(1)=tmp0H
+
+	; -- Even part
+
+	movdqa	xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm5, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm0, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm4, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm5, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm0, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	pxor      xmm1,xmm1
+	pxor      xmm2,xmm2
+	punpcklwd xmm1,xmm4		; xmm1=tmp0L
+	punpckhwd xmm2,xmm4		; xmm2=tmp0H
+	psrad     xmm1,(16-CONST_BITS-1) ; psrad xmm1,16 & pslld xmm1,CONST_BITS+1
+	psrad     xmm2,(16-CONST_BITS-1) ; psrad xmm2,16 & pslld xmm2,CONST_BITS+1
+
+	movdqa    xmm3,xmm5		; xmm5=in2=z2
+	punpcklwd xmm5,xmm0		; xmm0=in6=z3
+	punpckhwd xmm3,xmm0
+	pmaddwd   xmm5,[PW_F184_MF076]	; xmm5=tmp2L
+	pmaddwd   xmm3,[PW_F184_MF076]	; xmm3=tmp2H
+
+	movdqa	xmm4,xmm1
+	movdqa	xmm0,xmm2
+	paddd	xmm1,xmm5		; xmm1=tmp10L
+	paddd	xmm2,xmm3		; xmm2=tmp10H
+	psubd	xmm4,xmm5		; xmm4=tmp12L
+	psubd	xmm0,xmm3		; xmm0=tmp12H
+
+	; -- Final output stage
+
+	movdqa	xmm5,xmm1
+	movdqa	xmm3,xmm2
+	paddd	xmm1,xmm6		; xmm1=data0L
+	paddd	xmm2,xmm7		; xmm2=data0H
+	psubd	xmm5,xmm6		; xmm5=data3L
+	psubd	xmm3,xmm7		; xmm3=data3H
+
+	movdqa	xmm6,[PD_DESCALE_P1_4]	; xmm6=[PD_DESCALE_P1_4]
+
+	paddd	xmm1,xmm6
+	paddd	xmm2,xmm6
+	psrad	xmm1,DESCALE_P1_4
+	psrad	xmm2,DESCALE_P1_4
+	paddd	xmm5,xmm6
+	paddd	xmm3,xmm6
+	psrad	xmm5,DESCALE_P1_4
+	psrad	xmm3,DESCALE_P1_4
+
+	packssdw  xmm1,xmm2		; xmm1=data0=(00 01 02 03 04 05 06 07)
+	packssdw  xmm5,xmm3		; xmm5=data3=(30 31 32 33 34 35 36 37)
+
+	movdqa	xmm7, XMMWORD [wk(0)]	; xmm7=tmp0L
+	movdqa	xmm6, XMMWORD [wk(1)]	; xmm6=tmp0H
+
+	movdqa	xmm2,xmm4
+	movdqa	xmm3,xmm0
+	paddd	xmm4,xmm7		; xmm4=data1L
+	paddd	xmm0,xmm6		; xmm0=data1H
+	psubd	xmm2,xmm7		; xmm2=data2L
+	psubd	xmm3,xmm6		; xmm3=data2H
+
+	movdqa	xmm7,[PD_DESCALE_P1_4]	; xmm7=[PD_DESCALE_P1_4]
+
+	paddd	xmm4,xmm7
+	paddd	xmm0,xmm7
+	psrad	xmm4,DESCALE_P1_4
+	psrad	xmm0,DESCALE_P1_4
+	paddd	xmm2,xmm7
+	paddd	xmm3,xmm7
+	psrad	xmm2,DESCALE_P1_4
+	psrad	xmm3,DESCALE_P1_4
+
+	packssdw  xmm4,xmm0		; xmm4=data1=(10 11 12 13 14 15 16 17)
+	packssdw  xmm2,xmm3		; xmm2=data2=(20 21 22 23 24 25 26 27)
+
+	movdqa    xmm6,xmm1	; transpose coefficients(phase 1)
+	punpcklwd xmm1,xmm4	; xmm1=(00 10 01 11 02 12 03 13)
+	punpckhwd xmm6,xmm4	; xmm6=(04 14 05 15 06 16 07 17)
+	movdqa    xmm7,xmm2	; transpose coefficients(phase 1)
+	punpcklwd xmm2,xmm5	; xmm2=(20 30 21 31 22 32 23 33)
+	punpckhwd xmm7,xmm5	; xmm7=(24 34 25 35 26 36 27 37)
+
+	movdqa    xmm0,xmm1	; transpose coefficients(phase 2)
+	punpckldq xmm1,xmm2	; xmm1=[col0 col1]=(00 10 20 30 01 11 21 31)
+	punpckhdq xmm0,xmm2	; xmm0=[col2 col3]=(02 12 22 32 03 13 23 33)
+	movdqa    xmm3,xmm6	; transpose coefficients(phase 2)
+	punpckldq xmm6,xmm7	; xmm6=[col4 col5]=(04 14 24 34 05 15 25 35)
+	punpckhdq xmm3,xmm7	; xmm3=[col6 col7]=(06 16 26 36 07 17 27 37)
+.column_end:
+
+	; -- Prefetch the next coefficient block
+
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
+
+	; ---- Pass 2: process rows, store into output array.
+
+	mov	rax, [original_rbp]
+	mov	rdi, r12	; (JSAMPROW *)
+	mov	rax, r13
+
+	; -- Even part
+
+	pxor      xmm4,xmm4
+	punpcklwd xmm4,xmm1		; xmm4=tmp0
+	psrad     xmm4,(16-CONST_BITS-1) ; psrad xmm4,16 & pslld xmm4,CONST_BITS+1
+
+	; -- Odd part
+
+	punpckhwd xmm1,xmm0
+	punpckhwd xmm6,xmm3
+	movdqa    xmm5,xmm1
+	movdqa    xmm2,xmm6
+	pmaddwd   xmm1,[PW_F256_F089]	; xmm1=(tmp2)
+	pmaddwd   xmm6,[PW_MF060_MF050]	; xmm6=(tmp2)
+	pmaddwd   xmm5,[PW_F106_MF217]	; xmm5=(tmp0)
+	pmaddwd   xmm2,[PW_F145_MF021]	; xmm2=(tmp0)
+
+	paddd     xmm6,xmm1		; xmm6=tmp2
+	paddd     xmm2,xmm5		; xmm2=tmp0
+
+	; -- Even part
+
+	punpcklwd xmm0,xmm3
+	pmaddwd   xmm0,[PW_F184_MF076]	; xmm0=tmp2
+
+	movdqa    xmm7,xmm4
+	paddd     xmm4,xmm0		; xmm4=tmp10
+	psubd     xmm7,xmm0		; xmm7=tmp12
+
+	; -- Final output stage
+
+	movdqa	xmm1,[PD_DESCALE_P2_4]	; xmm1=[PD_DESCALE_P2_4]
+
+	movdqa	xmm5,xmm4
+	movdqa	xmm3,xmm7
+	paddd	xmm4,xmm6		; xmm4=data0=(00 10 20 30)
+	paddd	xmm7,xmm2		; xmm7=data1=(01 11 21 31)
+	psubd	xmm5,xmm6		; xmm5=data3=(03 13 23 33)
+	psubd	xmm3,xmm2		; xmm3=data2=(02 12 22 32)
+
+	paddd	xmm4,xmm1
+	paddd	xmm7,xmm1
+	psrad	xmm4,DESCALE_P2_4
+	psrad	xmm7,DESCALE_P2_4
+	paddd	xmm5,xmm1
+	paddd	xmm3,xmm1
+	psrad	xmm5,DESCALE_P2_4
+	psrad	xmm3,DESCALE_P2_4
+
+	packssdw  xmm4,xmm3		; xmm4=(00 10 20 30 02 12 22 32)
+	packssdw  xmm7,xmm5		; xmm7=(01 11 21 31 03 13 23 33)
+
+	movdqa    xmm0,xmm4		; transpose coefficients(phase 1)
+	punpcklwd xmm4,xmm7		; xmm4=(00 01 10 11 20 21 30 31)
+	punpckhwd xmm0,xmm7		; xmm0=(02 03 12 13 22 23 32 33)
+
+	movdqa    xmm6,xmm4		; transpose coefficients(phase 2)
+	punpckldq xmm4,xmm0		; xmm4=(00 01 02 03 10 11 12 13)
+	punpckhdq xmm6,xmm0		; xmm6=(20 21 22 23 30 31 32 33)
+
+	packsswb  xmm4,xmm6		; xmm4=(00 01 02 03 10 11 12 13 20 ..)
+	paddb     xmm4,[PB_CENTERJSAMP]
+
+	pshufd    xmm2,xmm4,0x39	; xmm2=(10 11 12 13 20 21 22 23 30 ..)
+	pshufd    xmm1,xmm4,0x4E	; xmm1=(20 21 22 23 30 31 32 33 00 ..)
+	pshufd    xmm3,xmm4,0x93	; xmm3=(30 31 32 33 00 01 02 03 10 ..)
+
+	mov	rdx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
+	movd	XMM_DWORD [rdx+rax*SIZEOF_JSAMPLE], xmm4
+	movd	XMM_DWORD [rsi+rax*SIZEOF_JSAMPLE], xmm2
+	mov	rdx, JSAMPROW [rdi+2*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+3*SIZEOF_JSAMPROW]
+	movd	XMM_DWORD [rdx+rax*SIZEOF_JSAMPLE], xmm1
+	movd	XMM_DWORD [rsi+rax*SIZEOF_JSAMPLE], xmm3
+
+	uncollect_args
+	mov	rsp,rbp		; rsp <- aligned rbp
+	pop	rsp		; rsp <- original rbp
+	pop	rbp
+	ret
+
+
+; --------------------------------------------------------------------------
+;
+; Perform dequantization and inverse DCT on one block of coefficients,
+; producing a reduced-size 2x2 output block.
+;
+; GLOBAL(void)
+; jsimd_idct_2x2_sse2 (void * dct_table, JCOEFPTR coef_block,
+;                      JSAMPARRAY output_buf, JDIMENSION output_col)
+;
+
+; r10 = void * dct_table
+; r11 = JCOEFPTR coef_block
+; r12 = JSAMPARRAY output_buf
+; r13 = JDIMENSION output_col
+
+	align	16
+	global	EXTN(jsimd_idct_2x2_sse2)
+
+EXTN(jsimd_idct_2x2_sse2):
+	push	rbp
+	mov	rbp,rsp
+	push	rbx
+	collect_args
+
+	; ---- Pass 1: process columns from input.
+
+	mov	rdx, r10	; quantptr
+	mov	rsi, r11		; inptr
+
+	; | input:                  | result:        |
+	; | 00 01 ** 03 ** 05 ** 07 |                |
+	; | 10 11 ** 13 ** 15 ** 17 |                |
+	; | ** ** ** ** ** ** ** ** |                |
+	; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 |
+	; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 |
+	; | 50 51 ** 53 ** 55 ** 57 |                |
+	; | ** ** ** ** ** ** ** ** |                |
+	; | 70 71 ** 73 ** 75 ** 77 |                |
+
+	; -- Odd part
+
+	movdqa	xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm1, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm0, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm1, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	movdqa	xmm2, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
+	movdqa	xmm3, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm2, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+	pmullw	xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	; xmm0=(10 11 ** 13 ** 15 ** 17), xmm1=(30 31 ** 33 ** 35 ** 37)
+	; xmm2=(50 51 ** 53 ** 55 ** 57), xmm3=(70 71 ** 73 ** 75 ** 77)
+
+	pcmpeqd   xmm7,xmm7
+	pslld     xmm7,WORD_BIT		; xmm7={0x0000 0xFFFF 0x0000 0xFFFF ..}
+
+	movdqa    xmm4,xmm0		; xmm4=(10 11 ** 13 ** 15 ** 17)
+	movdqa    xmm5,xmm2		; xmm5=(50 51 ** 53 ** 55 ** 57)
+	punpcklwd xmm4,xmm1		; xmm4=(10 30 11 31 ** ** 13 33)
+	punpcklwd xmm5,xmm3		; xmm5=(50 70 51 71 ** ** 53 73)
+	pmaddwd   xmm4,[PW_F362_MF127]
+	pmaddwd   xmm5,[PW_F085_MF072]
+
+	psrld	xmm0,WORD_BIT		; xmm0=(11 -- 13 -- 15 -- 17 --)
+	pand	xmm1,xmm7		; xmm1=(-- 31 -- 33 -- 35 -- 37)
+	psrld	xmm2,WORD_BIT		; xmm2=(51 -- 53 -- 55 -- 57 --)
+	pand	xmm3,xmm7		; xmm3=(-- 71 -- 73 -- 75 -- 77)
+	por	xmm0,xmm1		; xmm0=(11 31 13 33 15 35 17 37)
+	por	xmm2,xmm3		; xmm2=(51 71 53 73 55 75 57 77)
+	pmaddwd	xmm0,[PW_F362_MF127]
+	pmaddwd	xmm2,[PW_F085_MF072]
+
+	paddd	xmm4,xmm5		; xmm4=tmp0[col0 col1 **** col3]
+	paddd	xmm0,xmm2		; xmm0=tmp0[col1 col3 col5 col7]
+
+	; -- Even part
+
+	movdqa	xmm6, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
+	pmullw	xmm6, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
+
+	; xmm6=(00 01 ** 03 ** 05 ** 07)
+
+	movdqa	xmm1,xmm6		; xmm1=(00 01 ** 03 ** 05 ** 07)
+	pslld	xmm6,WORD_BIT		; xmm6=(-- 00 -- ** -- ** -- **)
+	pand	xmm1,xmm7		; xmm1=(-- 01 -- 03 -- 05 -- 07)
+	psrad	xmm6,(WORD_BIT-CONST_BITS-2) ; xmm6=tmp10[col0 **** **** ****]
+	psrad	xmm1,(WORD_BIT-CONST_BITS-2) ; xmm1=tmp10[col1 col3 col5 col7]
+
+	; -- Final output stage
+
+	movdqa	xmm3,xmm6
+	movdqa	xmm5,xmm1
+	paddd	xmm6,xmm4	; xmm6=data0[col0 **** **** ****]=(A0 ** ** **)
+	paddd	xmm1,xmm0	; xmm1=data0[col1 col3 col5 col7]=(A1 A3 A5 A7)
+	psubd	xmm3,xmm4	; xmm3=data1[col0 **** **** ****]=(B0 ** ** **)
+	psubd	xmm5,xmm0	; xmm5=data1[col1 col3 col5 col7]=(B1 B3 B5 B7)
+
+	movdqa	xmm2,[PD_DESCALE_P1_2]	; xmm2=[PD_DESCALE_P1_2]
+
+	punpckldq  xmm6,xmm3		; xmm6=(A0 B0 ** **)
+
+	movdqa     xmm7,xmm1
+	punpcklqdq xmm1,xmm5		; xmm1=(A1 A3 B1 B3)
+	punpckhqdq xmm7,xmm5		; xmm7=(A5 A7 B5 B7)
+
+	paddd	xmm6,xmm2
+	psrad	xmm6,DESCALE_P1_2
+
+	paddd	xmm1,xmm2
+	paddd	xmm7,xmm2
+	psrad	xmm1,DESCALE_P1_2
+	psrad	xmm7,DESCALE_P1_2
+
+	; -- Prefetch the next coefficient block
+
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
+	prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
+
+	; ---- Pass 2: process rows, store into output array.
+
+	mov	rdi, r12	; (JSAMPROW *)
+	mov	rax, r13
+
+	; | input:| result:|
+	; | A0 B0 |        |
+	; | A1 B1 | C0 C1  |
+	; | A3 B3 | D0 D1  |
+	; | A5 B5 |        |
+	; | A7 B7 |        |
+
+	; -- Odd part
+
+	packssdw  xmm1,xmm1		; xmm1=(A1 A3 B1 B3 A1 A3 B1 B3)
+	packssdw  xmm7,xmm7		; xmm7=(A5 A7 B5 B7 A5 A7 B5 B7)
+	pmaddwd   xmm1,[PW_F362_MF127]
+	pmaddwd   xmm7,[PW_F085_MF072]
+
+	paddd     xmm1,xmm7		; xmm1=tmp0[row0 row1 row0 row1]
+
+	; -- Even part
+
+	pslld     xmm6,(CONST_BITS+2)	; xmm6=tmp10[row0 row1 **** ****]
+
+	; -- Final output stage
+
+	movdqa    xmm4,xmm6
+	paddd     xmm6,xmm1	; xmm6=data0[row0 row1 **** ****]=(C0 C1 ** **)
+	psubd     xmm4,xmm1	; xmm4=data1[row0 row1 **** ****]=(D0 D1 ** **)
+
+	punpckldq xmm6,xmm4	; xmm6=(C0 D0 C1 D1)
+
+	paddd     xmm6,[PD_DESCALE_P2_2]
+	psrad     xmm6,DESCALE_P2_2
+
+	packssdw  xmm6,xmm6		; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1)
+	packsswb  xmm6,xmm6		; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1 ..)
+	paddb     xmm6,[PB_CENTERJSAMP]
+
+	pextrw	ebx,xmm6,0x00		; ebx=(C0 D0 -- --)
+	pextrw	ecx,xmm6,0x01		; ecx=(C1 D1 -- --)
+
+	mov	rdx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
+	mov	rsi, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
+	mov	WORD [rdx+rax*SIZEOF_JSAMPLE], bx
+	mov	WORD [rsi+rax*SIZEOF_JSAMPLE], cx
+
+	uncollect_args
+	pop	rbx
+	pop	rbp
+	ret
diff --git a/simd/jsimdcpu-64.asm b/simd/jsimdcpu-64.asm
new file mode 100644
index 0000000..6eaf629
--- /dev/null
+++ b/simd/jsimdcpu-64.asm
@@ -0,0 +1,95 @@
+;
+; jsimdcpu.asm - SIMD instruction support check
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright 2009 D. R. Commander
+;
+; Based on
+; x86 SIMD extension for IJG JPEG library
+; Copyright (C) 1999-2006, MIYASAKA Masaru.
+; For conditions of distribution and use, see copyright notice in jsimdext.inc
+;
+; This file should be assembled with NASM (Netwide Assembler),
+; can *not* be assembled with Microsoft's MASM or any compatible
+; assembler (including Borland's Turbo Assembler).
+; NASM is available from http://nasm.sourceforge.net/ or
+; http://sourceforge.net/project/showfiles.php?group_id=6208
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Check if the CPU supports SIMD instructions
+;
+; GLOBAL(unsigned int)
+; jpeg_simd_cpu_support (void)
+;
+
+	align	16
+	global	EXTN(jpeg_simd_cpu_support)
+
+EXTN(jpeg_simd_cpu_support):
+	push	rbx
+
+	xor	rdi,rdi			; simd support flag
+
+	pushfq
+	pop	rax
+	mov	rdx,rax
+	xor	rax, 1<<21		; flip ID bit in EFLAGS
+	push	rax
+	popfq
+	pushfq
+	pop	rax
+	xor	rax,rdx
+	jz	short .return		; CPUID is not supported
+
+	; Check for MMX instruction support
+	xor	rax,rax
+	cpuid
+	test	rax,rax
+	jz	short .return
+
+	xor	rax,rax
+	inc	rax
+	cpuid
+	mov	rax,rdx			; rax = Standard feature flags
+
+	test	rax, 1<<23		; bit23:MMX
+	jz	short .no_mmx
+	or	rdi, byte JSIMD_MMX
+.no_mmx:
+	test	rax, 1<<25		; bit25:SSE
+	jz	short .no_sse
+	or	rdi, byte JSIMD_SSE
+.no_sse:
+	test	rax, 1<<26		; bit26:SSE2
+	jz	short .no_sse2
+	or	rdi, byte JSIMD_SSE2
+.no_sse2:
+
+	; Check for 3DNow! instruction support
+	mov	eax, 0x80000000
+	cpuid
+	cmp	eax, 0x80000000
+	jbe	short .return
+
+	mov	rax, 0x80000001
+	cpuid
+	mov	rax,rdx			; eax = Extended feature flags
+
+	test	eax, 1<<31		; bit31:3DNow!(vendor independent)
+	jz	short .no_3dnow
+	or	edi, byte JSIMD_3DNOW
+.no_3dnow:
+
+.return:
+	mov	rax,rdi
+
+	pop	rbx
+	ret
+
diff --git a/simd/jsimdext.inc b/simd/jsimdext.inc
index d82b970..878f045 100644
--- a/simd/jsimdext.inc
+++ b/simd/jsimdext.inc
@@ -48,15 +48,20 @@
 %define SEG_TEXT    .text  align=16 public use32 class=CODE
 %define SEG_CONST   .data  align=16 public use32 class=DATA
 
-%elifdef ELF	; ----(nasm -felf -DELF ...)------------
+%elifdef ELF	; ----(nasm -felf[64] -DELF ...)------------
 ; * Linux
 ; * *BSD family Unix using elf format
 ; * Unix System V, including Solaris x86, UnixWare and SCO Unix
 
 ; -- segment definition --
 ;
+%ifdef __x86_64__
+%define SEG_TEXT    .text   progbits align=16
+%define SEG_CONST   .rodata progbits align=16
+%else
 %define SEG_TEXT    .text   progbits alloc exec   nowrite align=16
 %define SEG_CONST   .rodata progbits alloc noexec nowrite align=16
+%endif
 
 ; To make the code position-independent, append -DPIC to the commandline
 ;
@@ -103,9 +108,15 @@
 ; --------------------------------------------------------------------------
 ;  Common types
 ;
+%ifdef __x86_64__
+%define POINTER                 qword           ; general pointer type
+%define SIZEOF_POINTER          SIZEOF_QWORD    ; sizeof(POINTER)
+%define POINTER_BIT             QWORD_BIT       ; sizeof(POINTER)*BYTE_BIT
+%else
 %define POINTER                 dword           ; general pointer type
 %define SIZEOF_POINTER          SIZEOF_DWORD    ; sizeof(POINTER)
 %define POINTER_BIT             DWORD_BIT       ; sizeof(POINTER)*BYTE_BIT
+%endif
 
 %define INT                     dword           ; signed integer type
 %define SIZEOF_INT              SIZEOF_DWORD    ; sizeof(INT)
@@ -268,6 +279,32 @@
 	align %1, db 0		; filling zeros
 %endmacro
 
+%ifdef __x86_64__
+%imacro collect_args 0
+	push r10
+	push r11
+	push r12
+	push r13
+	push r14
+	push r15
+	mov r10, rdi
+	mov r11, rsi
+	mov r12, rdx
+	mov r13, rcx
+	mov r14, r8
+	mov r15, r9
+%endmacro
+
+%imacro uncollect_args 0
+	pop r15
+	pop r14
+	pop r13
+	pop r12
+	pop r11
+	pop r10
+%endmacro
+
+%endif
 
 ; --------------------------------------------------------------------------
 ;  Defines picked up from the C headers
diff --git a/simd/nasm_lt.sh b/simd/nasm_lt.sh
index ef5a591..68893b7 100755
--- a/simd/nasm_lt.sh
+++ b/simd/nasm_lt.sh
@@ -11,7 +11,7 @@
                 pic=yes
             fi
             ;;
-        -f|-fbin|-faout|-faoutb|-fcoff|-felf|-fas86| \
+        -f|-fbin|-faout|-faoutb|-fcoff|-felf|-felf64|-fas86| \
         -fobj|-fwin32|-frdf|-fieee|-fmacho)
             # it's a file format specifier for nasm.
             command="$command $1"