crc_folding.c - platform/external/zlib - Gitiles

 /*
  * Compute the CRC32 using a parallelized folding approach with the PCLMULQDQ
  * instruction.
  *
  * A white paper describing this algorithm can be found at:
  * http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf
  *
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  * Authors:
  * 	Wajdi Feghali   <wajdi.k.feghali@intel.com>
  * 	Jim Guilford    <james.guilford@intel.com>
  * 	Vinodh Gopal    <vinodh.gopal@intel.com>
  * 	Erdinc Ozturk   <erdinc.ozturk@intel.com>
  * 	Jim Kukunas     <james.t.kukunas@linux.intel.com>
  *
  * For conditions of distribution and use, see copyright notice in zlib.h
  */

 #include "deflate.h"

 #ifdef CRC32_SIMD_SSE42_PCLMUL

 #include <inttypes.h>
 #include <emmintrin.h>
 #include <immintrin.h>
 #include <wmmintrin.h>

 #define CRC_LOAD(s) \
     do { \
         __m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0);\
         __m128i xmm_crc1 = _mm_loadu_si128((__m128i *)s->crc0 + 1);\
         __m128i xmm_crc2 = _mm_loadu_si128((__m128i *)s->crc0 + 2);\
         __m128i xmm_crc3 = _mm_loadu_si128((__m128i *)s->crc0 + 3);\
         __m128i xmm_crc_part = _mm_loadu_si128((__m128i *)s->crc0 + 4);

 #define CRC_SAVE(s) \
         _mm_storeu_si128((__m128i *)s->crc0 + 0, xmm_crc0);\
         _mm_storeu_si128((__m128i *)s->crc0 + 1, xmm_crc1);\
         _mm_storeu_si128((__m128i *)s->crc0 + 2, xmm_crc2);\
         _mm_storeu_si128((__m128i *)s->crc0 + 3, xmm_crc3);\
         _mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part);\
     } while (0);

 ZLIB_INTERNAL void crc_fold_init(deflate_state *const s)
 {
     CRC_LOAD(s)

     xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
     xmm_crc1 = _mm_setzero_si128();
     xmm_crc2 = _mm_setzero_si128();
     xmm_crc3 = _mm_setzero_si128();

     CRC_SAVE(s)

     s->strm->adler = 0;
 }

 local void fold_1(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
 {
     const __m128i xmm_fold4 = _mm_set_epi32(
             0x00000001, 0x54442bd4,
             0x00000001, 0xc6e41596);

     __m128i x_tmp3;
     __m128 ps_crc0, ps_crc3, ps_res;

     x_tmp3 = *xmm_crc3;

     *xmm_crc3 = *xmm_crc0;
     *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
     *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
     ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
     ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
     ps_res = _mm_xor_ps(ps_crc0, ps_crc3);

     *xmm_crc0 = *xmm_crc1;
     *xmm_crc1 = *xmm_crc2;
     *xmm_crc2 = x_tmp3;
     *xmm_crc3 = _mm_castps_si128(ps_res);
 }

 local void fold_2(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
 {
     const __m128i xmm_fold4 = _mm_set_epi32(
             0x00000001, 0x54442bd4,
             0x00000001, 0xc6e41596);

     __m128i x_tmp3, x_tmp2;
     __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res31, ps_res20;

     x_tmp3 = *xmm_crc3;
     x_tmp2 = *xmm_crc2;

     *xmm_crc3 = *xmm_crc1;
     *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
     *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
     ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
     ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
     ps_res31= _mm_xor_ps(ps_crc3, ps_crc1);

     *xmm_crc2 = *xmm_crc0;
     *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
     *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
     ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
     ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
     ps_res20= _mm_xor_ps(ps_crc0, ps_crc2);

     *xmm_crc0 = x_tmp2;
     *xmm_crc1 = x_tmp3;
     *xmm_crc2 = _mm_castps_si128(ps_res20);
     *xmm_crc3 = _mm_castps_si128(ps_res31);
 }

 local void fold_3(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
 {
     const __m128i xmm_fold4 = _mm_set_epi32(
             0x00000001, 0x54442bd4,
             0x00000001, 0xc6e41596);

     __m128i x_tmp3;
     __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res32, ps_res21, ps_res10;

     x_tmp3 = *xmm_crc3;

     *xmm_crc3 = *xmm_crc2;
     *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
     *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
     ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
     ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
     ps_res32 = _mm_xor_ps(ps_crc2, ps_crc3);

     *xmm_crc2 = *xmm_crc1;
     *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
     *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
     ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
     ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
     ps_res21= _mm_xor_ps(ps_crc1, ps_crc2);

     *xmm_crc1 = *xmm_crc0;
     *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
     *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x10);
     ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
     ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
     ps_res10= _mm_xor_ps(ps_crc0, ps_crc1);

     *xmm_crc0 = x_tmp3;
     *xmm_crc1 = _mm_castps_si128(ps_res10);
     *xmm_crc2 = _mm_castps_si128(ps_res21);
     *xmm_crc3 = _mm_castps_si128(ps_res32);
 }

 local void fold_4(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
 {
     const __m128i xmm_fold4 = _mm_set_epi32(
             0x00000001, 0x54442bd4,
             0x00000001, 0xc6e41596);

     __m128i x_tmp0, x_tmp1, x_tmp2, x_tmp3;
     __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3;
     __m128 ps_t0, ps_t1, ps_t2, ps_t3;
     __m128 ps_res0, ps_res1, ps_res2, ps_res3;

     x_tmp0 = *xmm_crc0;
     x_tmp1 = *xmm_crc1;
     x_tmp2 = *xmm_crc2;
     x_tmp3 = *xmm_crc3;

     *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
     x_tmp0 = _mm_clmulepi64_si128(x_tmp0, xmm_fold4, 0x10);
     ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
     ps_t0 = _mm_castsi128_ps(x_tmp0);
     ps_res0 = _mm_xor_ps(ps_crc0, ps_t0);

     *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
     x_tmp1 = _mm_clmulepi64_si128(x_tmp1, xmm_fold4, 0x10);
     ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
     ps_t1 = _mm_castsi128_ps(x_tmp1);
     ps_res1 = _mm_xor_ps(ps_crc1, ps_t1);

     *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
     x_tmp2 = _mm_clmulepi64_si128(x_tmp2, xmm_fold4, 0x10);
     ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
     ps_t2 = _mm_castsi128_ps(x_tmp2);
     ps_res2 = _mm_xor_ps(ps_crc2, ps_t2);

     *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x01);
     x_tmp3 = _mm_clmulepi64_si128(x_tmp3, xmm_fold4, 0x10);
     ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
     ps_t3 = _mm_castsi128_ps(x_tmp3);
     ps_res3 = _mm_xor_ps(ps_crc3, ps_t3);

     *xmm_crc0 = _mm_castps_si128(ps_res0);
     *xmm_crc1 = _mm_castps_si128(ps_res1);
     *xmm_crc2 = _mm_castps_si128(ps_res2);
     *xmm_crc3 = _mm_castps_si128(ps_res3);
 }

 local const unsigned zalign(32) pshufb_shf_table[60] = {
 	0x84838281,0x88878685,0x8c8b8a89,0x008f8e8d, /* shl 15 (16 - 1)/shr1 */
 	0x85848382,0x89888786,0x8d8c8b8a,0x01008f8e, /* shl 14 (16 - 3)/shr2 */
 	0x86858483,0x8a898887,0x8e8d8c8b,0x0201008f, /* shl 13 (16 - 4)/shr3 */
 	0x87868584,0x8b8a8988,0x8f8e8d8c,0x03020100, /* shl 12 (16 - 4)/shr4 */
 	0x88878685,0x8c8b8a89,0x008f8e8d,0x04030201, /* shl 11 (16 - 5)/shr5 */
 	0x89888786,0x8d8c8b8a,0x01008f8e,0x05040302, /* shl 10 (16 - 6)/shr6 */
 	0x8a898887,0x8e8d8c8b,0x0201008f,0x06050403, /* shl  9 (16 - 7)/shr7 */
 	0x8b8a8988,0x8f8e8d8c,0x03020100,0x07060504, /* shl  8 (16 - 8)/shr8 */
 	0x8c8b8a89,0x008f8e8d,0x04030201,0x08070605, /* shl  7 (16 - 9)/shr9 */
 	0x8d8c8b8a,0x01008f8e,0x05040302,0x09080706, /* shl  6 (16 -10)/shr10*/
 	0x8e8d8c8b,0x0201008f,0x06050403,0x0a090807, /* shl  5 (16 -11)/shr11*/
 	0x8f8e8d8c,0x03020100,0x07060504,0x0b0a0908, /* shl  4 (16 -12)/shr12*/
 	0x008f8e8d,0x04030201,0x08070605,0x0c0b0a09, /* shl  3 (16 -13)/shr13*/
 	0x01008f8e,0x05040302,0x09080706,0x0d0c0b0a, /* shl  2 (16 -14)/shr14*/
 	0x0201008f,0x06050403,0x0a090807,0x0e0d0c0b  /* shl  1 (16 -15)/shr15*/
 };

 local void partial_fold(deflate_state *const s, const size_t len,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3,
         __m128i *xmm_crc_part)
 {

     const __m128i xmm_fold4 = _mm_set_epi32(
             0x00000001, 0x54442bd4,
             0x00000001, 0xc6e41596);
     const __m128i xmm_mask3 = _mm_set1_epi32(0x80808080);

     __m128i xmm_shl, xmm_shr, xmm_tmp1, xmm_tmp2, xmm_tmp3;
     __m128i xmm_a0_0, xmm_a0_1;
     __m128 ps_crc3, psa0_0, psa0_1, ps_res;

     xmm_shl = _mm_load_si128((__m128i *)pshufb_shf_table + (len - 1));
     xmm_shr = xmm_shl;
     xmm_shr = _mm_xor_si128(xmm_shr, xmm_mask3);

     xmm_a0_0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shl);

     *xmm_crc0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shr);
     xmm_tmp1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shl);
     *xmm_crc0 = _mm_or_si128(*xmm_crc0, xmm_tmp1);

     *xmm_crc1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shr);
     xmm_tmp2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shl);
     *xmm_crc1 = _mm_or_si128(*xmm_crc1, xmm_tmp2);

     *xmm_crc2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shr);
     xmm_tmp3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shl);
     *xmm_crc2 = _mm_or_si128(*xmm_crc2, xmm_tmp3);

     *xmm_crc3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shr);
     *xmm_crc_part = _mm_shuffle_epi8(*xmm_crc_part, xmm_shl);
     *xmm_crc3 = _mm_or_si128(*xmm_crc3, *xmm_crc_part);

     xmm_a0_1 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x10);
     xmm_a0_0 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x01);

     ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
     psa0_0 = _mm_castsi128_ps(xmm_a0_0);
     psa0_1 = _mm_castsi128_ps(xmm_a0_1);

     ps_res = _mm_xor_ps(ps_crc3, psa0_0);
     ps_res = _mm_xor_ps(ps_res, psa0_1);

     *xmm_crc3 = _mm_castps_si128(ps_res);
 }

 ZLIB_INTERNAL void crc_fold_copy(deflate_state *const s,
         unsigned char *dst, const unsigned char *src, long len)
 {
     unsigned long algn_diff;
     __m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;

     CRC_LOAD(s)

     if (len < 16) {
         if (len == 0)
             return;
         goto partial;
     }

     algn_diff = (0 - (uintptr_t)src) & 0xF;
     if (algn_diff) {
         xmm_crc_part = _mm_loadu_si128((__m128i *)src);
         _mm_storeu_si128((__m128i *)dst, xmm_crc_part);

         dst += algn_diff;
         src += algn_diff;
         len -= algn_diff;

         partial_fold(s, algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
             &xmm_crc_part);
     }

     while ((len -= 64) >= 0) {
         xmm_t0 = _mm_load_si128((__m128i *)src);
         xmm_t1 = _mm_load_si128((__m128i *)src + 1);
         xmm_t2 = _mm_load_si128((__m128i *)src + 2);
         xmm_t3 = _mm_load_si128((__m128i *)src + 3);

         fold_4(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

         _mm_storeu_si128((__m128i *)dst, xmm_t0);
         _mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
         _mm_storeu_si128((__m128i *)dst + 2, xmm_t2);
         _mm_storeu_si128((__m128i *)dst + 3, xmm_t3);

         xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0);
         xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1);
         xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2);
         xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3);

         src += 64;
         dst += 64;
     }

     /*
      * len = num bytes left - 64
      */
     if (len + 16 >= 0) {
         len += 16;

         xmm_t0 = _mm_load_si128((__m128i *)src);
         xmm_t1 = _mm_load_si128((__m128i *)src + 1);
         xmm_t2 = _mm_load_si128((__m128i *)src + 2);

         fold_3(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

         _mm_storeu_si128((__m128i *)dst, xmm_t0);
         _mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
         _mm_storeu_si128((__m128i *)dst + 2, xmm_t2);

         xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t0);
         xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t1);
         xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t2);

         if (len == 0)
             goto done;

         dst += 48;
         src += 48;
     } else if (len + 32 >= 0) {
         len += 32;

         xmm_t0 = _mm_load_si128((__m128i *)src);
         xmm_t1 = _mm_load_si128((__m128i *)src + 1);

         fold_2(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

         _mm_storeu_si128((__m128i *)dst, xmm_t0);
         _mm_storeu_si128((__m128i *)dst + 1, xmm_t1);

         xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0);
         xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1);

         if (len == 0)
             goto done;

         dst += 32;
         src += 32;
     } else if (len + 48 >= 0) {
         len += 48;

         xmm_t0 = _mm_load_si128((__m128i *)src);

         fold_1(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

         _mm_storeu_si128((__m128i *)dst, xmm_t0);

         xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);

         if (len == 0)
             goto done;

         dst += 16;
         src += 16;
     } else {
         len += 64;
         if (len == 0)
             goto done;
     }

 partial:

 #if defined(_MSC_VER)
     /* VS does not permit the use of _mm_set_epi64x in 32-bit builds */
     {
         int32_t parts[4] = {0, 0, 0, 0};
         memcpy(&parts, src, len);
         xmm_crc_part = _mm_set_epi32(parts[3], parts[2], parts[1], parts[0]);
     }
 #else
     {
         int64_t parts[2] = {0, 0};
         memcpy(&parts, src, len);
         xmm_crc_part = _mm_set_epi64x(parts[1], parts[0]);
     }
 #endif

     _mm_storeu_si128((__m128i *)dst, xmm_crc_part);
     partial_fold(s, len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
         &xmm_crc_part);
 done:
     CRC_SAVE(s)
 }

 local const unsigned zalign(16) crc_k[] = {
     0xccaa009e, 0x00000000, /* rk1 */
     0x751997d0, 0x00000001, /* rk2 */
     0xccaa009e, 0x00000000, /* rk5 */
     0x63cd6124, 0x00000001, /* rk6 */
     0xf7011640, 0x00000001, /* rk7 */
     0xdb710640, 0x00000001  /* rk8 */
 };

 local const unsigned zalign(16) crc_mask[4] = {
     0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000
 };

 local const unsigned zalign(16) crc_mask2[4] = {
     0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
 };

 unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s)
 {
     const __m128i xmm_mask  = _mm_load_si128((__m128i *)crc_mask);
     const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2);

     unsigned crc;
     __m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;

     CRC_LOAD(s)

     /*
      * k1
      */
     crc_fold = _mm_load_si128((__m128i *)crc_k);

     x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10);
     xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01);
     xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0);
     xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0);

     x_tmp1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x10);
     xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x01);
     xmm_crc2 = _mm_xor_si128(xmm_crc2, x_tmp1);
     xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_crc1);

     x_tmp2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x10);
     xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x01);
     xmm_crc3 = _mm_xor_si128(xmm_crc3, x_tmp2);
     xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);

     /*
      * k5
      */
     crc_fold = _mm_load_si128((__m128i *)crc_k + 1);

     xmm_crc0 = xmm_crc3;
     xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
     xmm_crc0 = _mm_srli_si128(xmm_crc0, 8);
     xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);

     xmm_crc0 = xmm_crc3;
     xmm_crc3 = _mm_slli_si128(xmm_crc3, 4);
     xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
     xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
     xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask2);

     /*
      * k7
      */
     xmm_crc1 = xmm_crc3;
     xmm_crc2 = xmm_crc3;
     crc_fold = _mm_load_si128((__m128i *)crc_k + 2);

     xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
     xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
     xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask);

     xmm_crc2 = xmm_crc3;
     xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
     xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
     xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc1);

     crc = _mm_extract_epi32(xmm_crc3, 2);
     return ~crc;
     CRC_SAVE(s)
 }

 #endif  /* CRC32_SIMD_SSE42_PCLMUL */
	/*
	* Compute the CRC32 using a parallelized folding approach with the PCLMULQDQ
	* instruction.
	*
	* A white paper describing this algorithm can be found at:
	* http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf
	*
	* Copyright (C) 2013 Intel Corporation. All rights reserved.
	* Authors:
	* Wajdi Feghali <wajdi.k.feghali@intel.com>
	* Jim Guilford <james.guilford@intel.com>
	* Vinodh Gopal <vinodh.gopal@intel.com>
	* Erdinc Ozturk <erdinc.ozturk@intel.com>
	* Jim Kukunas <james.t.kukunas@linux.intel.com>
	*
	* For conditions of distribution and use, see copyright notice in zlib.h
	*/

	#include "deflate.h"

	#ifdef CRC32_SIMD_SSE42_PCLMUL

	#include <inttypes.h>
	#include <emmintrin.h>
	#include <immintrin.h>
	#include <wmmintrin.h>

	#define CRC_LOAD(s) \
	do { \
	__m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0);\
	__m128i xmm_crc1 = _mm_loadu_si128((__m128i *)s->crc0 + 1);\
	__m128i xmm_crc2 = _mm_loadu_si128((__m128i *)s->crc0 + 2);\
	__m128i xmm_crc3 = _mm_loadu_si128((__m128i *)s->crc0 + 3);\
	__m128i xmm_crc_part = _mm_loadu_si128((__m128i *)s->crc0 + 4);

	#define CRC_SAVE(s) \
	_mm_storeu_si128((__m128i *)s->crc0 + 0, xmm_crc0);\
	_mm_storeu_si128((__m128i *)s->crc0 + 1, xmm_crc1);\
	_mm_storeu_si128((__m128i *)s->crc0 + 2, xmm_crc2);\
	_mm_storeu_si128((__m128i *)s->crc0 + 3, xmm_crc3);\
	_mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part);\
	} while (0);

	ZLIB_INTERNAL void crc_fold_init(deflate_state *const s)
	{
	CRC_LOAD(s)

	xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
	xmm_crc1 = _mm_setzero_si128();
	xmm_crc2 = _mm_setzero_si128();
	xmm_crc3 = _mm_setzero_si128();

	CRC_SAVE(s)

	s->strm->adler = 0;
	}

	local void fold_1(deflate_state *const s,
	__m128i xmm_crc0, __m128i xmm_crc1,
	__m128i xmm_crc2, __m128i xmm_crc3)
	{
	const __m128i xmm_fold4 = _mm_set_epi32(
	0x00000001, 0x54442bd4,
	0x00000001, 0xc6e41596);

	__m128i x_tmp3;
	__m128 ps_crc0, ps_crc3, ps_res;

	x_tmp3 = *xmm_crc3;

	xmm_crc3 = xmm_crc0;
	xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, xmm_fold4, 0x01);
	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, xmm_fold4, 0x10);
	ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
	ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
	ps_res = _mm_xor_ps(ps_crc0, ps_crc3);

	xmm_crc0 = xmm_crc1;
	xmm_crc1 = xmm_crc2;
	*xmm_crc2 = x_tmp3;
	*xmm_crc3 = _mm_castps_si128(ps_res);
	}

	local void fold_2(deflate_state *const s,
	__m128i xmm_crc0, __m128i xmm_crc1,
	__m128i xmm_crc2, __m128i xmm_crc3)
	{
	const __m128i xmm_fold4 = _mm_set_epi32(
	0x00000001, 0x54442bd4,
	0x00000001, 0xc6e41596);

	__m128i x_tmp3, x_tmp2;
	__m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res31, ps_res20;

	x_tmp3 = *xmm_crc3;
	x_tmp2 = *xmm_crc2;

	xmm_crc3 = xmm_crc1;
	xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, xmm_fold4, 0x01);
	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, xmm_fold4, 0x10);
	ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
	ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
	ps_res31= _mm_xor_ps(ps_crc3, ps_crc1);

	xmm_crc2 = xmm_crc0;
	xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, xmm_fold4, 0x01);
	xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, xmm_fold4, 0x10);
	ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
	ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
	ps_res20= _mm_xor_ps(ps_crc0, ps_crc2);

	*xmm_crc0 = x_tmp2;
	*xmm_crc1 = x_tmp3;
	*xmm_crc2 = _mm_castps_si128(ps_res20);
	*xmm_crc3 = _mm_castps_si128(ps_res31);
	}

	local void fold_3(deflate_state *const s,
	__m128i xmm_crc0, __m128i xmm_crc1,
	__m128i xmm_crc2, __m128i xmm_crc3)
	{
	const __m128i xmm_fold4 = _mm_set_epi32(
	0x00000001, 0x54442bd4,
	0x00000001, 0xc6e41596);

	__m128i x_tmp3;
	__m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res32, ps_res21, ps_res10;

	x_tmp3 = *xmm_crc3;

	xmm_crc3 = xmm_crc2;
	xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, xmm_fold4, 0x01);
	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, xmm_fold4, 0x10);
	ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
	ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
	ps_res32 = _mm_xor_ps(ps_crc2, ps_crc3);

	xmm_crc2 = xmm_crc1;
	xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, xmm_fold4, 0x01);
	xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, xmm_fold4, 0x10);
	ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
	ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
	ps_res21= _mm_xor_ps(ps_crc1, ps_crc2);

	xmm_crc1 = xmm_crc0;
	xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, xmm_fold4, 0x01);
	xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, xmm_fold4, 0x10);
	ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
	ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
	ps_res10= _mm_xor_ps(ps_crc0, ps_crc1);

	*xmm_crc0 = x_tmp3;
	*xmm_crc1 = _mm_castps_si128(ps_res10);
	*xmm_crc2 = _mm_castps_si128(ps_res21);
	*xmm_crc3 = _mm_castps_si128(ps_res32);
	}

	local void fold_4(deflate_state *const s,
	__m128i xmm_crc0, __m128i xmm_crc1,
	__m128i xmm_crc2, __m128i xmm_crc3)
	{
	const __m128i xmm_fold4 = _mm_set_epi32(
	0x00000001, 0x54442bd4,
	0x00000001, 0xc6e41596);

	__m128i x_tmp0, x_tmp1, x_tmp2, x_tmp3;
	__m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3;
	__m128 ps_t0, ps_t1, ps_t2, ps_t3;
	__m128 ps_res0, ps_res1, ps_res2, ps_res3;

	x_tmp0 = *xmm_crc0;
	x_tmp1 = *xmm_crc1;
	x_tmp2 = *xmm_crc2;
	x_tmp3 = *xmm_crc3;

	xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, xmm_fold4, 0x01);
	x_tmp0 = _mm_clmulepi64_si128(x_tmp0, xmm_fold4, 0x10);
	ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
	ps_t0 = _mm_castsi128_ps(x_tmp0);
	ps_res0 = _mm_xor_ps(ps_crc0, ps_t0);

	xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, xmm_fold4, 0x01);
	x_tmp1 = _mm_clmulepi64_si128(x_tmp1, xmm_fold4, 0x10);
	ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
	ps_t1 = _mm_castsi128_ps(x_tmp1);
	ps_res1 = _mm_xor_ps(ps_crc1, ps_t1);

	xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, xmm_fold4, 0x01);
	x_tmp2 = _mm_clmulepi64_si128(x_tmp2, xmm_fold4, 0x10);
	ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
	ps_t2 = _mm_castsi128_ps(x_tmp2);
	ps_res2 = _mm_xor_ps(ps_crc2, ps_t2);

	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, xmm_fold4, 0x01);
	x_tmp3 = _mm_clmulepi64_si128(x_tmp3, xmm_fold4, 0x10);
	ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
	ps_t3 = _mm_castsi128_ps(x_tmp3);
	ps_res3 = _mm_xor_ps(ps_crc3, ps_t3);

	*xmm_crc0 = _mm_castps_si128(ps_res0);
	*xmm_crc1 = _mm_castps_si128(ps_res1);
	*xmm_crc2 = _mm_castps_si128(ps_res2);
	*xmm_crc3 = _mm_castps_si128(ps_res3);
	}

	local const unsigned zalign(32) pshufb_shf_table[60] = {
	0x84838281,0x88878685,0x8c8b8a89,0x008f8e8d, /* shl 15 (16 - 1)/shr1 */
	0x85848382,0x89888786,0x8d8c8b8a,0x01008f8e, /* shl 14 (16 - 3)/shr2 */
	0x86858483,0x8a898887,0x8e8d8c8b,0x0201008f, /* shl 13 (16 - 4)/shr3 */
	0x87868584,0x8b8a8988,0x8f8e8d8c,0x03020100, /* shl 12 (16 - 4)/shr4 */
	0x88878685,0x8c8b8a89,0x008f8e8d,0x04030201, /* shl 11 (16 - 5)/shr5 */
	0x89888786,0x8d8c8b8a,0x01008f8e,0x05040302, /* shl 10 (16 - 6)/shr6 */
	0x8a898887,0x8e8d8c8b,0x0201008f,0x06050403, /* shl 9 (16 - 7)/shr7 */
	0x8b8a8988,0x8f8e8d8c,0x03020100,0x07060504, /* shl 8 (16 - 8)/shr8 */
	0x8c8b8a89,0x008f8e8d,0x04030201,0x08070605, /* shl 7 (16 - 9)/shr9 */
	0x8d8c8b8a,0x01008f8e,0x05040302,0x09080706, /* shl 6 (16 -10)/shr10*/
	0x8e8d8c8b,0x0201008f,0x06050403,0x0a090807, /* shl 5 (16 -11)/shr11*/
	0x8f8e8d8c,0x03020100,0x07060504,0x0b0a0908, /* shl 4 (16 -12)/shr12*/
	0x008f8e8d,0x04030201,0x08070605,0x0c0b0a09, /* shl 3 (16 -13)/shr13*/
	0x01008f8e,0x05040302,0x09080706,0x0d0c0b0a, /* shl 2 (16 -14)/shr14*/
	0x0201008f,0x06050403,0x0a090807,0x0e0d0c0b /* shl 1 (16 -15)/shr15*/
	};

	local void partial_fold(deflate_state *const s, const size_t len,
	__m128i xmm_crc0, __m128i xmm_crc1,
	__m128i xmm_crc2, __m128i xmm_crc3,
	__m128i *xmm_crc_part)
	{

	const __m128i xmm_fold4 = _mm_set_epi32(
	0x00000001, 0x54442bd4,
	0x00000001, 0xc6e41596);
	const __m128i xmm_mask3 = _mm_set1_epi32(0x80808080);

	__m128i xmm_shl, xmm_shr, xmm_tmp1, xmm_tmp2, xmm_tmp3;
	__m128i xmm_a0_0, xmm_a0_1;
	__m128 ps_crc3, psa0_0, psa0_1, ps_res;

	xmm_shl = _mm_load_si128((__m128i *)pshufb_shf_table + (len - 1));
	xmm_shr = xmm_shl;
	xmm_shr = _mm_xor_si128(xmm_shr, xmm_mask3);

	xmm_a0_0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shl);

	xmm_crc0 = _mm_shuffle_epi8(xmm_crc0, xmm_shr);
	xmm_tmp1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shl);
	xmm_crc0 = _mm_or_si128(xmm_crc0, xmm_tmp1);

	xmm_crc1 = _mm_shuffle_epi8(xmm_crc1, xmm_shr);
	xmm_tmp2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shl);
	xmm_crc1 = _mm_or_si128(xmm_crc1, xmm_tmp2);

	xmm_crc2 = _mm_shuffle_epi8(xmm_crc2, xmm_shr);
	xmm_tmp3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shl);
	xmm_crc2 = _mm_or_si128(xmm_crc2, xmm_tmp3);

	xmm_crc3 = _mm_shuffle_epi8(xmm_crc3, xmm_shr);
	xmm_crc_part = _mm_shuffle_epi8(xmm_crc_part, xmm_shl);
	xmm_crc3 = _mm_or_si128(xmm_crc3, *xmm_crc_part);

	xmm_a0_1 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x10);
	xmm_a0_0 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x01);

	ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
	psa0_0 = _mm_castsi128_ps(xmm_a0_0);
	psa0_1 = _mm_castsi128_ps(xmm_a0_1);

	ps_res = _mm_xor_ps(ps_crc3, psa0_0);
	ps_res = _mm_xor_ps(ps_res, psa0_1);

	*xmm_crc3 = _mm_castps_si128(ps_res);
	}

	ZLIB_INTERNAL void crc_fold_copy(deflate_state *const s,
	unsigned char dst, const unsigned char src, long len)
	{
	unsigned long algn_diff;
	__m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;

	CRC_LOAD(s)

	if (len < 16) {
	if (len == 0)
	return;
	goto partial;
	}

	algn_diff = (0 - (uintptr_t)src) & 0xF;
	if (algn_diff) {
	xmm_crc_part = _mm_loadu_si128((__m128i *)src);
	_mm_storeu_si128((__m128i *)dst, xmm_crc_part);

	dst += algn_diff;
	src += algn_diff;
	len -= algn_diff;

	partial_fold(s, algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
	&xmm_crc_part);
	}

	while ((len -= 64) >= 0) {
	xmm_t0 = _mm_load_si128((__m128i *)src);
	xmm_t1 = _mm_load_si128((__m128i *)src + 1);
	xmm_t2 = _mm_load_si128((__m128i *)src + 2);
	xmm_t3 = _mm_load_si128((__m128i *)src + 3);

	fold_4(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

	_mm_storeu_si128((__m128i *)dst, xmm_t0);
	_mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
	_mm_storeu_si128((__m128i *)dst + 2, xmm_t2);
	_mm_storeu_si128((__m128i *)dst + 3, xmm_t3);

	xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0);
	xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1);
	xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3);

	src += 64;
	dst += 64;
	}

	/*
	* len = num bytes left - 64
	*/
	if (len + 16 >= 0) {
	len += 16;

	xmm_t0 = _mm_load_si128((__m128i *)src);
	xmm_t1 = _mm_load_si128((__m128i *)src + 1);
	xmm_t2 = _mm_load_si128((__m128i *)src + 2);

	fold_3(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

	_mm_storeu_si128((__m128i *)dst, xmm_t0);
	_mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
	_mm_storeu_si128((__m128i *)dst + 2, xmm_t2);

	xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t0);
	xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t1);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t2);

	if (len == 0)
	goto done;

	dst += 48;
	src += 48;
	} else if (len + 32 >= 0) {
	len += 32;

	xmm_t0 = _mm_load_si128((__m128i *)src);
	xmm_t1 = _mm_load_si128((__m128i *)src + 1);

	fold_2(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

	_mm_storeu_si128((__m128i *)dst, xmm_t0);
	_mm_storeu_si128((__m128i *)dst + 1, xmm_t1);

	xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1);

	if (len == 0)
	goto done;

	dst += 32;
	src += 32;
	} else if (len + 48 >= 0) {
	len += 48;

	xmm_t0 = _mm_load_si128((__m128i *)src);

	fold_1(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);

	_mm_storeu_si128((__m128i *)dst, xmm_t0);

	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);

	if (len == 0)
	goto done;

	dst += 16;
	src += 16;
	} else {
	len += 64;
	if (len == 0)
	goto done;
	}

	partial:

	#if defined(_MSC_VER)
	/* VS does not permit the use of _mm_set_epi64x in 32-bit builds */
	{
	int32_t parts[4] = {0, 0, 0, 0};
	memcpy(&parts, src, len);
	xmm_crc_part = _mm_set_epi32(parts[3], parts[2], parts[1], parts[0]);
	}
	#else
	{
	int64_t parts[2] = {0, 0};
	memcpy(&parts, src, len);
	xmm_crc_part = _mm_set_epi64x(parts[1], parts[0]);
	}
	#endif

	_mm_storeu_si128((__m128i *)dst, xmm_crc_part);
	partial_fold(s, len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
	&xmm_crc_part);
	done:
	CRC_SAVE(s)
	}

	local const unsigned zalign(16) crc_k[] = {
	0xccaa009e, 0x00000000, /* rk1 */
	0x751997d0, 0x00000001, /* rk2 */
	0xccaa009e, 0x00000000, /* rk5 */
	0x63cd6124, 0x00000001, /* rk6 */
	0xf7011640, 0x00000001, /* rk7 */
	0xdb710640, 0x00000001 /* rk8 */
	};

	local const unsigned zalign(16) crc_mask[4] = {
	0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000
	};

	local const unsigned zalign(16) crc_mask2[4] = {
	0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
	};

	unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s)
	{
	const __m128i xmm_mask = _mm_load_si128((__m128i *)crc_mask);
	const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2);

	unsigned crc;
	__m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;

	CRC_LOAD(s)

	/*
	* k1
	*/
	crc_fold = _mm_load_si128((__m128i *)crc_k);

	x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10);
	xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01);
	xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0);
	xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0);

	x_tmp1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x10);
	xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x01);
	xmm_crc2 = _mm_xor_si128(xmm_crc2, x_tmp1);
	xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_crc1);

	x_tmp2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x10);
	xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x01);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, x_tmp2);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);

	/*
	* k5
	*/
	crc_fold = _mm_load_si128((__m128i *)crc_k + 1);

	xmm_crc0 = xmm_crc3;
	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
	xmm_crc0 = _mm_srli_si128(xmm_crc0, 8);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);

	xmm_crc0 = xmm_crc3;
	xmm_crc3 = _mm_slli_si128(xmm_crc3, 4);
	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
	xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask2);

	/*
	* k7
	*/
	xmm_crc1 = xmm_crc3;
	xmm_crc2 = xmm_crc3;
	crc_fold = _mm_load_si128((__m128i *)crc_k + 2);

	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
	xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask);

	xmm_crc2 = xmm_crc3;
	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc1);

	crc = _mm_extract_epi32(xmm_crc3, 2);
	return ~crc;
	CRC_SAVE(s)
	}

	#endif /* CRC32_SIMD_SSE42_PCLMUL */