scroggo | 3965825 | 2016-06-02 12:59:59 -0700 | [diff] [blame] | 1 | |
| 2 | /* filter_neon_intrinsics.c - NEON optimised filter functions |
| 3 | * |
| 4 | * Copyright (c) 2014,2016 Glenn Randers-Pehrson |
| 5 | * Written by James Yu <james.yu at linaro.org>, October 2013. |
| 6 | * Based on filter_neon.S, written by Mans Rullgard, 2011. |
| 7 | * |
| 8 | * Last changed in libpng 1.6.22 [(PENDING RELEASE)] |
| 9 | * |
| 10 | * This code is released under the libpng license. |
| 11 | * For conditions of distribution and use, see the disclaimer |
| 12 | * and license in png.h |
| 13 | */ |
| 14 | |
| 15 | #include "../pngpriv.h" |
| 16 | |
| 17 | #ifdef PNG_READ_SUPPORTED |
| 18 | |
| 19 | /* This code requires -mfpu=neon on the command line: */ |
| 20 | #if PNG_ARM_NEON_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */ |
| 21 | |
| 22 | #include <arm_neon.h> |
| 23 | |
| 24 | /* libpng row pointers are not necessarily aligned to any particular boundary, |
| 25 | * however this code will only work with appropriate alignment. arm/arm_init.c |
| 26 | * checks for this (and will not compile unless it is done). This code uses |
| 27 | * variants of png_aligncast to avoid compiler warnings. |
| 28 | */ |
| 29 | #define png_ptr(type,pointer) png_aligncast(type *,pointer) |
| 30 | #define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer) |
| 31 | |
| 32 | /* The following relies on a variable 'temp_pointer' being declared with type |
| 33 | * 'type'. This is written this way just to hide the GCC strict aliasing |
| 34 | * warning; note that the code is safe because there never is an alias between |
| 35 | * the input and output pointers. |
| 36 | */ |
| 37 | #define png_ldr(type,pointer)\ |
| 38 | (temp_pointer = png_ptr(type,pointer), *temp_pointer) |
| 39 | |
| 40 | #if PNG_ARM_NEON_OPT > 0 |
| 41 | |
| 42 | void |
| 43 | png_read_filter_row_up_neon(png_row_infop row_info, png_bytep row, |
| 44 | png_const_bytep prev_row) |
| 45 | { |
| 46 | png_bytep rp = row; |
| 47 | png_bytep rp_stop = row + row_info->rowbytes; |
| 48 | png_const_bytep pp = prev_row; |
| 49 | |
| 50 | png_debug(1, "in png_read_filter_row_up_neon"); |
| 51 | |
| 52 | for (; rp < rp_stop; rp += 16, pp += 16) |
| 53 | { |
| 54 | uint8x16_t qrp, qpp; |
| 55 | |
| 56 | qrp = vld1q_u8(rp); |
| 57 | qpp = vld1q_u8(pp); |
| 58 | qrp = vaddq_u8(qrp, qpp); |
| 59 | vst1q_u8(rp, qrp); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | void |
| 64 | png_read_filter_row_sub3_neon(png_row_infop row_info, png_bytep row, |
| 65 | png_const_bytep prev_row) |
| 66 | { |
| 67 | png_bytep rp = row; |
| 68 | png_bytep rp_stop = row + row_info->rowbytes; |
| 69 | |
| 70 | uint8x16_t vtmp = vld1q_u8(rp); |
| 71 | uint8x8x2_t *vrpt = png_ptr(uint8x8x2_t, &vtmp); |
| 72 | uint8x8x2_t vrp = *vrpt; |
| 73 | |
| 74 | uint8x8x4_t vdest; |
| 75 | vdest.val[3] = vdup_n_u8(0); |
| 76 | |
| 77 | png_debug(1, "in png_read_filter_row_sub3_neon"); |
| 78 | |
| 79 | for (; rp < rp_stop;) |
| 80 | { |
| 81 | uint8x8_t vtmp1, vtmp2; |
| 82 | uint32x2_t *temp_pointer; |
| 83 | |
| 84 | vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3); |
| 85 | vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]); |
| 86 | vtmp2 = vext_u8(vrp.val[0], vrp.val[1], 6); |
| 87 | vdest.val[1] = vadd_u8(vdest.val[0], vtmp1); |
| 88 | |
| 89 | vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1); |
| 90 | vdest.val[2] = vadd_u8(vdest.val[1], vtmp2); |
| 91 | vdest.val[3] = vadd_u8(vdest.val[2], vtmp1); |
| 92 | |
| 93 | vtmp = vld1q_u8(rp + 12); |
| 94 | vrpt = png_ptr(uint8x8x2_t, &vtmp); |
| 95 | vrp = *vrpt; |
| 96 | |
| 97 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0); |
| 98 | rp += 3; |
| 99 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0); |
| 100 | rp += 3; |
| 101 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0); |
| 102 | rp += 3; |
| 103 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0); |
| 104 | rp += 3; |
| 105 | } |
| 106 | |
| 107 | PNG_UNUSED(prev_row) |
| 108 | } |
| 109 | |
| 110 | void |
| 111 | png_read_filter_row_sub4_neon(png_row_infop row_info, png_bytep row, |
| 112 | png_const_bytep prev_row) |
| 113 | { |
| 114 | png_bytep rp = row; |
| 115 | png_bytep rp_stop = row + row_info->rowbytes; |
| 116 | |
| 117 | uint8x8x4_t vdest; |
| 118 | vdest.val[3] = vdup_n_u8(0); |
| 119 | |
| 120 | png_debug(1, "in png_read_filter_row_sub4_neon"); |
| 121 | |
| 122 | for (; rp < rp_stop; rp += 16) |
| 123 | { |
| 124 | uint32x2x4_t vtmp = vld4_u32(png_ptr(uint32_t,rp)); |
| 125 | uint8x8x4_t *vrpt = png_ptr(uint8x8x4_t,&vtmp); |
| 126 | uint8x8x4_t vrp = *vrpt; |
| 127 | uint32x2x4_t *temp_pointer; |
| 128 | |
| 129 | vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]); |
| 130 | vdest.val[1] = vadd_u8(vdest.val[0], vrp.val[1]); |
| 131 | vdest.val[2] = vadd_u8(vdest.val[1], vrp.val[2]); |
| 132 | vdest.val[3] = vadd_u8(vdest.val[2], vrp.val[3]); |
| 133 | vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0); |
| 134 | } |
| 135 | |
| 136 | PNG_UNUSED(prev_row) |
| 137 | } |
| 138 | |
| 139 | void |
| 140 | png_read_filter_row_avg3_neon(png_row_infop row_info, png_bytep row, |
| 141 | png_const_bytep prev_row) |
| 142 | { |
| 143 | png_bytep rp = row; |
| 144 | png_const_bytep pp = prev_row; |
| 145 | png_bytep rp_stop = row + row_info->rowbytes; |
| 146 | |
| 147 | uint8x16_t vtmp; |
| 148 | uint8x8x2_t *vrpt; |
| 149 | uint8x8x2_t vrp; |
| 150 | uint8x8x4_t vdest; |
| 151 | vdest.val[3] = vdup_n_u8(0); |
| 152 | |
| 153 | vtmp = vld1q_u8(rp); |
| 154 | vrpt = png_ptr(uint8x8x2_t,&vtmp); |
| 155 | vrp = *vrpt; |
| 156 | |
| 157 | png_debug(1, "in png_read_filter_row_avg3_neon"); |
| 158 | |
| 159 | for (; rp < rp_stop; pp += 12) |
| 160 | { |
| 161 | uint8x8_t vtmp1, vtmp2, vtmp3; |
| 162 | |
| 163 | uint8x8x2_t *vppt; |
| 164 | uint8x8x2_t vpp; |
| 165 | |
| 166 | uint32x2_t *temp_pointer; |
| 167 | |
| 168 | vtmp = vld1q_u8(pp); |
| 169 | vppt = png_ptr(uint8x8x2_t,&vtmp); |
| 170 | vpp = *vppt; |
| 171 | |
| 172 | vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3); |
| 173 | vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]); |
| 174 | vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); |
| 175 | |
| 176 | vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3); |
| 177 | vtmp3 = vext_u8(vrp.val[0], vrp.val[1], 6); |
| 178 | vdest.val[1] = vhadd_u8(vdest.val[0], vtmp2); |
| 179 | vdest.val[1] = vadd_u8(vdest.val[1], vtmp1); |
| 180 | |
| 181 | vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 6); |
| 182 | vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1); |
| 183 | |
| 184 | vtmp = vld1q_u8(rp + 12); |
| 185 | vrpt = png_ptr(uint8x8x2_t,&vtmp); |
| 186 | vrp = *vrpt; |
| 187 | |
| 188 | vdest.val[2] = vhadd_u8(vdest.val[1], vtmp2); |
| 189 | vdest.val[2] = vadd_u8(vdest.val[2], vtmp3); |
| 190 | |
| 191 | vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1); |
| 192 | |
| 193 | vdest.val[3] = vhadd_u8(vdest.val[2], vtmp2); |
| 194 | vdest.val[3] = vadd_u8(vdest.val[3], vtmp1); |
| 195 | |
| 196 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0); |
| 197 | rp += 3; |
| 198 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0); |
| 199 | rp += 3; |
| 200 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0); |
| 201 | rp += 3; |
| 202 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0); |
| 203 | rp += 3; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | void |
| 208 | png_read_filter_row_avg4_neon(png_row_infop row_info, png_bytep row, |
| 209 | png_const_bytep prev_row) |
| 210 | { |
| 211 | png_bytep rp = row; |
| 212 | png_bytep rp_stop = row + row_info->rowbytes; |
| 213 | png_const_bytep pp = prev_row; |
| 214 | |
| 215 | uint8x8x4_t vdest; |
| 216 | vdest.val[3] = vdup_n_u8(0); |
| 217 | |
| 218 | png_debug(1, "in png_read_filter_row_avg4_neon"); |
| 219 | |
| 220 | for (; rp < rp_stop; rp += 16, pp += 16) |
| 221 | { |
| 222 | uint32x2x4_t vtmp; |
| 223 | uint8x8x4_t *vrpt, *vppt; |
| 224 | uint8x8x4_t vrp, vpp; |
| 225 | uint32x2x4_t *temp_pointer; |
| 226 | |
| 227 | vtmp = vld4_u32(png_ptr(uint32_t,rp)); |
| 228 | vrpt = png_ptr(uint8x8x4_t,&vtmp); |
| 229 | vrp = *vrpt; |
| 230 | vtmp = vld4_u32(png_ptrc(uint32_t,pp)); |
| 231 | vppt = png_ptr(uint8x8x4_t,&vtmp); |
| 232 | vpp = *vppt; |
| 233 | |
| 234 | vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]); |
| 235 | vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); |
| 236 | vdest.val[1] = vhadd_u8(vdest.val[0], vpp.val[1]); |
| 237 | vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]); |
| 238 | vdest.val[2] = vhadd_u8(vdest.val[1], vpp.val[2]); |
| 239 | vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]); |
| 240 | vdest.val[3] = vhadd_u8(vdest.val[2], vpp.val[3]); |
| 241 | vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]); |
| 242 | |
| 243 | vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0); |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | static uint8x8_t |
| 248 | paeth(uint8x8_t a, uint8x8_t b, uint8x8_t c) |
| 249 | { |
| 250 | uint8x8_t d, e; |
| 251 | uint16x8_t p1, pa, pb, pc; |
| 252 | |
| 253 | p1 = vaddl_u8(a, b); /* a + b */ |
| 254 | pc = vaddl_u8(c, c); /* c * 2 */ |
| 255 | pa = vabdl_u8(b, c); /* pa */ |
| 256 | pb = vabdl_u8(a, c); /* pb */ |
| 257 | pc = vabdq_u16(p1, pc); /* pc */ |
| 258 | |
| 259 | p1 = vcleq_u16(pa, pb); /* pa <= pb */ |
| 260 | pa = vcleq_u16(pa, pc); /* pa <= pc */ |
| 261 | pb = vcleq_u16(pb, pc); /* pb <= pc */ |
| 262 | |
| 263 | p1 = vandq_u16(p1, pa); /* pa <= pb && pa <= pc */ |
| 264 | |
| 265 | d = vmovn_u16(pb); |
| 266 | e = vmovn_u16(p1); |
| 267 | |
| 268 | d = vbsl_u8(d, b, c); |
| 269 | e = vbsl_u8(e, a, d); |
| 270 | |
| 271 | return e; |
| 272 | } |
| 273 | |
| 274 | void |
| 275 | png_read_filter_row_paeth3_neon(png_row_infop row_info, png_bytep row, |
| 276 | png_const_bytep prev_row) |
| 277 | { |
| 278 | png_bytep rp = row; |
| 279 | png_const_bytep pp = prev_row; |
| 280 | png_bytep rp_stop = row + row_info->rowbytes; |
| 281 | |
| 282 | uint8x16_t vtmp; |
| 283 | uint8x8x2_t *vrpt; |
| 284 | uint8x8x2_t vrp; |
| 285 | uint8x8_t vlast = vdup_n_u8(0); |
| 286 | uint8x8x4_t vdest; |
| 287 | vdest.val[3] = vdup_n_u8(0); |
| 288 | |
| 289 | vtmp = vld1q_u8(rp); |
| 290 | vrpt = png_ptr(uint8x8x2_t,&vtmp); |
| 291 | vrp = *vrpt; |
| 292 | |
| 293 | png_debug(1, "in png_read_filter_row_paeth3_neon"); |
| 294 | |
| 295 | for (; rp < rp_stop; pp += 12) |
| 296 | { |
| 297 | uint8x8x2_t *vppt; |
| 298 | uint8x8x2_t vpp; |
| 299 | uint8x8_t vtmp1, vtmp2, vtmp3; |
| 300 | uint32x2_t *temp_pointer; |
| 301 | |
| 302 | vtmp = vld1q_u8(pp); |
| 303 | vppt = png_ptr(uint8x8x2_t,&vtmp); |
| 304 | vpp = *vppt; |
| 305 | |
| 306 | vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast); |
| 307 | vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); |
| 308 | |
| 309 | vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3); |
| 310 | vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3); |
| 311 | vdest.val[1] = paeth(vdest.val[0], vtmp2, vpp.val[0]); |
| 312 | vdest.val[1] = vadd_u8(vdest.val[1], vtmp1); |
| 313 | |
| 314 | vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 6); |
| 315 | vtmp3 = vext_u8(vpp.val[0], vpp.val[1], 6); |
| 316 | vdest.val[2] = paeth(vdest.val[1], vtmp3, vtmp2); |
| 317 | vdest.val[2] = vadd_u8(vdest.val[2], vtmp1); |
| 318 | |
| 319 | vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1); |
| 320 | vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1); |
| 321 | |
| 322 | vtmp = vld1q_u8(rp + 12); |
| 323 | vrpt = png_ptr(uint8x8x2_t,&vtmp); |
| 324 | vrp = *vrpt; |
| 325 | |
| 326 | vdest.val[3] = paeth(vdest.val[2], vtmp2, vtmp3); |
| 327 | vdest.val[3] = vadd_u8(vdest.val[3], vtmp1); |
| 328 | |
| 329 | vlast = vtmp2; |
| 330 | |
| 331 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0); |
| 332 | rp += 3; |
| 333 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0); |
| 334 | rp += 3; |
| 335 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0); |
| 336 | rp += 3; |
| 337 | vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0); |
| 338 | rp += 3; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | void |
| 343 | png_read_filter_row_paeth4_neon(png_row_infop row_info, png_bytep row, |
| 344 | png_const_bytep prev_row) |
| 345 | { |
| 346 | png_bytep rp = row; |
| 347 | png_bytep rp_stop = row + row_info->rowbytes; |
| 348 | png_const_bytep pp = prev_row; |
| 349 | |
| 350 | uint8x8_t vlast = vdup_n_u8(0); |
| 351 | uint8x8x4_t vdest; |
| 352 | vdest.val[3] = vdup_n_u8(0); |
| 353 | |
| 354 | png_debug(1, "in png_read_filter_row_paeth4_neon"); |
| 355 | |
| 356 | for (; rp < rp_stop; rp += 16, pp += 16) |
| 357 | { |
| 358 | uint32x2x4_t vtmp; |
| 359 | uint8x8x4_t *vrpt, *vppt; |
| 360 | uint8x8x4_t vrp, vpp; |
| 361 | uint32x2x4_t *temp_pointer; |
| 362 | |
| 363 | vtmp = vld4_u32(png_ptr(uint32_t,rp)); |
| 364 | vrpt = png_ptr(uint8x8x4_t,&vtmp); |
| 365 | vrp = *vrpt; |
| 366 | vtmp = vld4_u32(png_ptrc(uint32_t,pp)); |
| 367 | vppt = png_ptr(uint8x8x4_t,&vtmp); |
| 368 | vpp = *vppt; |
| 369 | |
| 370 | vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast); |
| 371 | vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); |
| 372 | vdest.val[1] = paeth(vdest.val[0], vpp.val[1], vpp.val[0]); |
| 373 | vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]); |
| 374 | vdest.val[2] = paeth(vdest.val[1], vpp.val[2], vpp.val[1]); |
| 375 | vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]); |
| 376 | vdest.val[3] = paeth(vdest.val[2], vpp.val[3], vpp.val[2]); |
| 377 | vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]); |
| 378 | |
| 379 | vlast = vpp.val[3]; |
| 380 | |
| 381 | vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0); |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | #endif /* PNG_ARM_NEON_OPT > 0 */ |
| 386 | #endif /* PNG_ARM_NEON_IMPLEMENTATION == 1 (intrinsics) */ |
| 387 | #endif /* READ */ |