src/third_party/ffmpeg/libavcodec/x86/motion_est.c

   1 /*
   2  * MMX optimized motion estimation
   3  * Copyright (c) 2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer
   5  *
   6  * mostly by Michael Niedermayer <michaelni@gmx.at>
   7  *
   8  * This file is part of FFmpeg.
   9  *
  10  * FFmpeg is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * FFmpeg is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with FFmpeg; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 #include "libavutil/attributes.h"
  26 #include "libavutil/avassert.h"
  27 #include "libavutil/mem.h"
  28 #include "libavutil/x86/asm.h"
  29 #include "libavutil/x86/cpu.h"
  30 #include "libavcodec/mpegvideo.h"
  31 #include "dsputil_x86.h"
  32
  33 #if HAVE_INLINE_ASM
  34
  35 DECLARE_ASM_CONST(8, uint64_t, round_tab)[3] = {
  36     0x0000000000000000ULL,
  37     0x0001000100010001ULL,
  38     0x0002000200020002ULL,
  39 };
  40
  41 DECLARE_ASM_CONST(8, uint64_t, bone) = 0x0101010101010101LL;
  42
  43 static inline void sad8_1_mmx(uint8_t *blk1, uint8_t *blk2, int stride, int h)
  44 {
  45     x86_reg len = -(x86_reg)stride * h;
  46     __asm__ volatile (
  47         ".p2align 4                     \n\t"
  48         "1:                             \n\t"
  49         "movq (%1, %%"REG_a"), %%mm0    \n\t"
  50         "movq (%2, %%"REG_a"), %%mm2    \n\t"
  51         "movq (%2, %%"REG_a"), %%mm4    \n\t"
  52         "add %3, %%"REG_a"              \n\t"
  53         "psubusb %%mm0, %%mm2           \n\t"
  54         "psubusb %%mm4, %%mm0           \n\t"
  55         "movq (%1, %%"REG_a"), %%mm1    \n\t"
  56         "movq (%2, %%"REG_a"), %%mm3    \n\t"
  57         "movq (%2, %%"REG_a"), %%mm5    \n\t"
  58         "psubusb %%mm1, %%mm3           \n\t"
  59         "psubusb %%mm5, %%mm1           \n\t"
  60         "por %%mm2, %%mm0               \n\t"
  61         "por %%mm1, %%mm3               \n\t"
  62         "movq %%mm0, %%mm1              \n\t"
  63         "movq %%mm3, %%mm2              \n\t"
  64         "punpcklbw %%mm7, %%mm0         \n\t"
  65         "punpckhbw %%mm7, %%mm1         \n\t"
  66         "punpcklbw %%mm7, %%mm3         \n\t"
  67         "punpckhbw %%mm7, %%mm2         \n\t"
  68         "paddw %%mm1, %%mm0             \n\t"
  69         "paddw %%mm3, %%mm2             \n\t"
  70         "paddw %%mm2, %%mm0             \n\t"
  71         "paddw %%mm0, %%mm6             \n\t"
  72         "add %3, %%"REG_a"              \n\t"
  73         " js 1b                         \n\t"
  74         : "+a" (len)
  75         : "r" (blk1 - len), "r" (blk2 - len), "r" ((x86_reg) stride));
  76 }
  77
  78 static inline void sad8_1_mmxext(uint8_t *blk1, uint8_t *blk2,
  79                                  int stride, int h)
  80 {
  81     __asm__ volatile (
  82         ".p2align 4                     \n\t"
  83         "1:                             \n\t"
  84         "movq (%1), %%mm0               \n\t"
  85         "movq (%1, %3), %%mm1           \n\t"
  86         "psadbw (%2), %%mm0             \n\t"
  87         "psadbw (%2, %3), %%mm1         \n\t"
  88         "paddw %%mm0, %%mm6             \n\t"
  89         "paddw %%mm1, %%mm6             \n\t"
  90         "lea (%1,%3,2), %1              \n\t"
  91         "lea (%2,%3,2), %2              \n\t"
  92         "sub $2, %0                     \n\t"
  93         " jg 1b                         \n\t"
  94         : "+r" (h), "+r" (blk1), "+r" (blk2)
  95         : "r" ((x86_reg) stride));
  96 }
  97
  98 static int sad16_sse2(MpegEncContext *v, uint8_t *blk2, uint8_t *blk1,
  99                       int stride, int h)
 100 {
 101     int ret;
 102     __asm__ volatile (
 103         "pxor %%xmm2, %%xmm2            \n\t"
 104         ".p2align 4                     \n\t"
 105         "1:                             \n\t"
 106         "movdqu (%1), %%xmm0            \n\t"
 107         "movdqu (%1, %4), %%xmm1        \n\t"
 108         "psadbw (%2), %%xmm0            \n\t"
 109         "psadbw (%2, %4), %%xmm1        \n\t"
 110         "paddw %%xmm0, %%xmm2           \n\t"
 111         "paddw %%xmm1, %%xmm2           \n\t"
 112         "lea (%1,%4,2), %1              \n\t"
 113         "lea (%2,%4,2), %2              \n\t"
 114         "sub $2, %0                     \n\t"
 115         " jg 1b                         \n\t"
 116         "movhlps %%xmm2, %%xmm0         \n\t"
 117         "paddw   %%xmm0, %%xmm2         \n\t"
 118         "movd    %%xmm2, %3             \n\t"
 119         : "+r" (h), "+r" (blk1), "+r" (blk2), "=r" (ret)
 120         : "r" ((x86_reg) stride));
 121     return ret;
 122 }
 123
 124 static inline void sad8_x2a_mmxext(uint8_t *blk1, uint8_t *blk2,
 125                                    int stride, int h)
 126 {
 127     __asm__ volatile (
 128         ".p2align 4                     \n\t"
 129         "1:                             \n\t"
 130         "movq (%1), %%mm0               \n\t"
 131         "movq (%1, %3), %%mm1           \n\t"
 132         "pavgb 1(%1), %%mm0             \n\t"
 133         "pavgb 1(%1, %3), %%mm1         \n\t"
 134         "psadbw (%2), %%mm0             \n\t"
 135         "psadbw (%2, %3), %%mm1         \n\t"
 136         "paddw %%mm0, %%mm6             \n\t"
 137         "paddw %%mm1, %%mm6             \n\t"
 138         "lea (%1,%3,2), %1              \n\t"
 139         "lea (%2,%3,2), %2              \n\t"
 140         "sub $2, %0                     \n\t"
 141         " jg 1b                         \n\t"
 142         : "+r" (h), "+r" (blk1), "+r" (blk2)
 143         : "r" ((x86_reg) stride));
 144 }
 145
 146 static inline void sad8_y2a_mmxext(uint8_t *blk1, uint8_t *blk2,
 147                                    int stride, int h)
 148 {
 149     __asm__ volatile (
 150         "movq (%1), %%mm0               \n\t"
 151         "add %3, %1                     \n\t"
 152         ".p2align 4                     \n\t"
 153         "1:                             \n\t"
 154         "movq (%1), %%mm1               \n\t"
 155         "movq (%1, %3), %%mm2           \n\t"
 156         "pavgb %%mm1, %%mm0             \n\t"
 157         "pavgb %%mm2, %%mm1             \n\t"
 158         "psadbw (%2), %%mm0             \n\t"
 159         "psadbw (%2, %3), %%mm1         \n\t"
 160         "paddw %%mm0, %%mm6             \n\t"
 161         "paddw %%mm1, %%mm6             \n\t"
 162         "movq %%mm2, %%mm0              \n\t"
 163         "lea (%1,%3,2), %1              \n\t"
 164         "lea (%2,%3,2), %2              \n\t"
 165         "sub $2, %0                     \n\t"
 166         " jg 1b                         \n\t"
 167         : "+r" (h), "+r" (blk1), "+r" (blk2)
 168         : "r" ((x86_reg) stride));
 169 }
 170
 171 static inline void sad8_4_mmxext(uint8_t *blk1, uint8_t *blk2,
 172                                  int stride, int h)
 173 {
 174     __asm__ volatile (
 175         "movq "MANGLE(bone)", %%mm5     \n\t"
 176         "movq (%1), %%mm0               \n\t"
 177         "pavgb 1(%1), %%mm0             \n\t"
 178         "add %3, %1                     \n\t"
 179         ".p2align 4                     \n\t"
 180         "1:                             \n\t"
 181         "movq (%1), %%mm1               \n\t"
 182         "movq (%1,%3), %%mm2            \n\t"
 183         "pavgb 1(%1), %%mm1             \n\t"
 184         "pavgb 1(%1,%3), %%mm2          \n\t"
 185         "psubusb %%mm5, %%mm1           \n\t"
 186         "pavgb %%mm1, %%mm0             \n\t"
 187         "pavgb %%mm2, %%mm1             \n\t"
 188         "psadbw (%2), %%mm0             \n\t"
 189         "psadbw (%2,%3), %%mm1          \n\t"
 190         "paddw %%mm0, %%mm6             \n\t"
 191         "paddw %%mm1, %%mm6             \n\t"
 192         "movq %%mm2, %%mm0              \n\t"
 193         "lea (%1,%3,2), %1              \n\t"
 194         "lea (%2,%3,2), %2              \n\t"
 195         "sub $2, %0                     \n\t"
 196         " jg 1b                         \n\t"
 197         : "+r" (h), "+r" (blk1), "+r" (blk2)
 198         : "r" ((x86_reg) stride)
 199           NAMED_CONSTRAINTS_ADD(bone));
 200 }
 201
 202 static inline void sad8_2_mmx(uint8_t *blk1a, uint8_t *blk1b, uint8_t *blk2,
 203                               int stride, int h)
 204 {
 205     x86_reg len = -(x86_reg)stride * h;
 206     __asm__ volatile (
 207         ".p2align 4                     \n\t"
 208         "1:                             \n\t"
 209         "movq (%1, %%"REG_a"), %%mm0    \n\t"
 210         "movq (%2, %%"REG_a"), %%mm1    \n\t"
 211         "movq (%1, %%"REG_a"), %%mm2    \n\t"
 212         "movq (%2, %%"REG_a"), %%mm3    \n\t"
 213         "punpcklbw %%mm7, %%mm0         \n\t"
 214         "punpcklbw %%mm7, %%mm1         \n\t"
 215         "punpckhbw %%mm7, %%mm2         \n\t"
 216         "punpckhbw %%mm7, %%mm3         \n\t"
 217         "paddw %%mm0, %%mm1             \n\t"
 218         "paddw %%mm2, %%mm3             \n\t"
 219         "movq (%3, %%"REG_a"), %%mm4    \n\t"
 220         "movq (%3, %%"REG_a"), %%mm2    \n\t"
 221         "paddw %%mm5, %%mm1             \n\t"
 222         "paddw %%mm5, %%mm3             \n\t"
 223         "psrlw $1, %%mm1                \n\t"
 224         "psrlw $1, %%mm3                \n\t"
 225         "packuswb %%mm3, %%mm1          \n\t"
 226         "psubusb %%mm1, %%mm4           \n\t"
 227         "psubusb %%mm2, %%mm1           \n\t"
 228         "por %%mm4, %%mm1               \n\t"
 229         "movq %%mm1, %%mm0              \n\t"
 230         "punpcklbw %%mm7, %%mm0         \n\t"
 231         "punpckhbw %%mm7, %%mm1         \n\t"
 232         "paddw %%mm1, %%mm0             \n\t"
 233         "paddw %%mm0, %%mm6             \n\t"
 234         "add %4, %%"REG_a"              \n\t"
 235         " js 1b                         \n\t"
 236         : "+a" (len)
 237         : "r" (blk1a - len), "r" (blk1b - len), "r" (blk2 - len),
 238           "r" ((x86_reg) stride));
 239 }
 240
 241 static inline void sad8_4_mmx(uint8_t *blk1, uint8_t *blk2, int stride, int h)
 242 {
 243     x86_reg len = -(x86_reg)stride * h;
 244     __asm__ volatile (
 245         "movq  (%1, %%"REG_a"), %%mm0   \n\t"
 246         "movq 1(%1, %%"REG_a"), %%mm2   \n\t"
 247         "movq %%mm0, %%mm1              \n\t"
 248         "movq %%mm2, %%mm3              \n\t"
 249         "punpcklbw %%mm7, %%mm0         \n\t"
 250         "punpckhbw %%mm7, %%mm1         \n\t"
 251         "punpcklbw %%mm7, %%mm2         \n\t"
 252         "punpckhbw %%mm7, %%mm3         \n\t"
 253         "paddw %%mm2, %%mm0             \n\t"
 254         "paddw %%mm3, %%mm1             \n\t"
 255         ".p2align 4                     \n\t"
 256         "1:                             \n\t"
 257         "movq  (%2, %%"REG_a"), %%mm2   \n\t"
 258         "movq 1(%2, %%"REG_a"), %%mm4   \n\t"
 259         "movq %%mm2, %%mm3              \n\t"
 260         "movq %%mm4, %%mm5              \n\t"
 261         "punpcklbw %%mm7, %%mm2         \n\t"
 262         "punpckhbw %%mm7, %%mm3         \n\t"
 263         "punpcklbw %%mm7, %%mm4         \n\t"
 264         "punpckhbw %%mm7, %%mm5         \n\t"
 265         "paddw %%mm4, %%mm2             \n\t"
 266         "paddw %%mm5, %%mm3             \n\t"
 267         "movq %5, %%mm5                 \n\t"
 268         "paddw %%mm2, %%mm0             \n\t"
 269         "paddw %%mm3, %%mm1             \n\t"
 270         "paddw %%mm5, %%mm0             \n\t"
 271         "paddw %%mm5, %%mm1             \n\t"
 272         "movq (%3, %%"REG_a"), %%mm4    \n\t"
 273         "movq (%3, %%"REG_a"), %%mm5    \n\t"
 274         "psrlw $2, %%mm0                \n\t"
 275         "psrlw $2, %%mm1                \n\t"
 276         "packuswb %%mm1, %%mm0          \n\t"
 277         "psubusb %%mm0, %%mm4           \n\t"
 278         "psubusb %%mm5, %%mm0           \n\t"
 279         "por %%mm4, %%mm0               \n\t"
 280         "movq %%mm0, %%mm4              \n\t"
 281         "punpcklbw %%mm7, %%mm0         \n\t"
 282         "punpckhbw %%mm7, %%mm4         \n\t"
 283         "paddw %%mm0, %%mm6             \n\t"
 284         "paddw %%mm4, %%mm6             \n\t"
 285         "movq  %%mm2, %%mm0             \n\t"
 286         "movq  %%mm3, %%mm1             \n\t"
 287         "add %4, %%"REG_a"              \n\t"
 288         " js 1b                         \n\t"
 289         : "+a" (len)
 290         : "r" (blk1 - len), "r" (blk1 - len + stride), "r" (blk2 - len),
 291           "r" ((x86_reg) stride), "m" (round_tab[2]));
 292 }
 293
 294 static inline int sum_mmx(void)
 295 {
 296     int ret;
 297     __asm__ volatile (
 298         "movq %%mm6, %%mm0              \n\t"
 299         "psrlq $32, %%mm6               \n\t"
 300         "paddw %%mm0, %%mm6             \n\t"
 301         "movq %%mm6, %%mm0              \n\t"
 302         "psrlq $16, %%mm6               \n\t"
 303         "paddw %%mm0, %%mm6             \n\t"
 304         "movd %%mm6, %0                 \n\t"
 305         : "=r" (ret));
 306     return ret & 0xFFFF;
 307 }
 308
 309 static inline int sum_mmxext(void)
 310 {
 311     int ret;
 312     __asm__ volatile (
 313         "movd %%mm6, %0                 \n\t"
 314         : "=r" (ret));
 315     return ret;
 316 }
 317
 318 static inline void sad8_x2a_mmx(uint8_t *blk1, uint8_t *blk2, int stride, int h)
 319 {
 320     sad8_2_mmx(blk1, blk1 + 1, blk2, stride, h);
 321 }
 322
 323 static inline void sad8_y2a_mmx(uint8_t *blk1, uint8_t *blk2, int stride, int h)
 324 {
 325     sad8_2_mmx(blk1, blk1 + stride, blk2, stride, h);
 326 }
 327
 328 #define PIX_SAD(suf)                                                    \
 329 static int sad8_ ## suf(MpegEncContext *v, uint8_t *blk2,               \
 330                         uint8_t *blk1, int stride, int h)               \
 331 {                                                                       \
 332     av_assert2(h == 8);                                                     \
 333     __asm__ volatile (                                                  \
 334         "pxor %%mm7, %%mm7     \n\t"                                    \
 335         "pxor %%mm6, %%mm6     \n\t"                                    \
 336         :);                                                             \
 337                                                                         \
 338     sad8_1_ ## suf(blk1, blk2, stride, 8);                              \
 339                                                                         \
 340     return sum_ ## suf();                                               \
 341 }                                                                       \
 342                                                                         \
 343 static int sad8_x2_ ## suf(MpegEncContext *v, uint8_t *blk2,            \
 344                            uint8_t *blk1, int stride, int h)            \
 345 {                                                                       \
 346     av_assert2(h == 8);                                                     \
 347     __asm__ volatile (                                                  \
 348         "pxor %%mm7, %%mm7     \n\t"                                    \
 349         "pxor %%mm6, %%mm6     \n\t"                                    \
 350         "movq %0, %%mm5        \n\t"                                    \
 351         :: "m" (round_tab[1]));                                         \
 352                                                                         \
 353     sad8_x2a_ ## suf(blk1, blk2, stride, 8);                            \
 354                                                                         \
 355     return sum_ ## suf();                                               \
 356 }                                                                       \
 357                                                                         \
 358 static int sad8_y2_ ## suf(MpegEncContext *v, uint8_t *blk2,            \
 359                            uint8_t *blk1, int stride, int h)            \
 360 {                                                                       \
 361     av_assert2(h == 8);                                                     \
 362     __asm__ volatile (                                                  \
 363         "pxor %%mm7, %%mm7     \n\t"                                    \
 364         "pxor %%mm6, %%mm6     \n\t"                                    \
 365         "movq %0, %%mm5        \n\t"                                    \
 366         :: "m" (round_tab[1]));                                         \
 367                                                                         \
 368     sad8_y2a_ ## suf(blk1, blk2, stride, 8);                            \
 369                                                                         \
 370     return sum_ ## suf();                                               \
 371 }                                                                       \
 372                                                                         \
 373 static int sad8_xy2_ ## suf(MpegEncContext *v, uint8_t *blk2,           \
 374                             uint8_t *blk1, int stride, int h)           \
 375 {                                                                       \
 376     av_assert2(h == 8);                                                     \
 377     __asm__ volatile (                                                  \
 378         "pxor %%mm7, %%mm7     \n\t"                                    \
 379         "pxor %%mm6, %%mm6     \n\t"                                    \
 380         ::);                                                            \
 381                                                                         \
 382     sad8_4_ ## suf(blk1, blk2, stride, 8);                              \
 383                                                                         \
 384     return sum_ ## suf();                                               \
 385 }                                                                       \
 386                                                                         \
 387 static int sad16_ ## suf(MpegEncContext *v, uint8_t *blk2,              \
 388                          uint8_t *blk1, int stride, int h)              \
 389 {                                                                       \
 390     __asm__ volatile (                                                  \
 391         "pxor %%mm7, %%mm7     \n\t"                                    \
 392         "pxor %%mm6, %%mm6     \n\t"                                    \
 393         :);                                                             \
 394                                                                         \
 395     sad8_1_ ## suf(blk1,     blk2,     stride, h);                      \
 396     sad8_1_ ## suf(blk1 + 8, blk2 + 8, stride, h);                      \
 397                                                                         \
 398     return sum_ ## suf();                                               \
 399 }                                                                       \
 400                                                                         \
 401 static int sad16_x2_ ## suf(MpegEncContext *v, uint8_t *blk2,           \
 402                             uint8_t *blk1, int stride, int h)           \
 403 {                                                                       \
 404     __asm__ volatile (                                                  \
 405         "pxor %%mm7, %%mm7     \n\t"                                    \
 406         "pxor %%mm6, %%mm6     \n\t"                                    \
 407         "movq %0, %%mm5        \n\t"                                    \
 408         :: "m" (round_tab[1]));                                         \
 409                                                                         \
 410     sad8_x2a_ ## suf(blk1,     blk2,     stride, h);                    \
 411     sad8_x2a_ ## suf(blk1 + 8, blk2 + 8, stride, h);                    \
 412                                                                         \
 413     return sum_ ## suf();                                               \
 414 }                                                                       \
 415                                                                         \
 416 static int sad16_y2_ ## suf(MpegEncContext *v, uint8_t *blk2,           \
 417                             uint8_t *blk1, int stride, int h)           \
 418 {                                                                       \
 419     __asm__ volatile (                                                  \
 420         "pxor %%mm7, %%mm7     \n\t"                                    \
 421         "pxor %%mm6, %%mm6     \n\t"                                    \
 422         "movq %0, %%mm5        \n\t"                                    \
 423         :: "m" (round_tab[1]));                                         \
 424                                                                         \
 425     sad8_y2a_ ## suf(blk1,     blk2,     stride, h);                    \
 426     sad8_y2a_ ## suf(blk1 + 8, blk2 + 8, stride, h);                    \
 427                                                                         \
 428     return sum_ ## suf();                                               \
 429 }                                                                       \
 430                                                                         \
 431 static int sad16_xy2_ ## suf(MpegEncContext *v, uint8_t *blk2,          \
 432                              uint8_t *blk1, int stride, int h)          \
 433 {                                                                       \
 434     __asm__ volatile (                                                  \
 435         "pxor %%mm7, %%mm7     \n\t"                                    \
 436         "pxor %%mm6, %%mm6     \n\t"                                    \
 437         ::);                                                            \
 438                                                                         \
 439     sad8_4_ ## suf(blk1,     blk2,     stride, h);                      \
 440     sad8_4_ ## suf(blk1 + 8, blk2 + 8, stride, h);                      \
 441                                                                         \
 442     return sum_ ## suf();                                               \
 443 }                                                                       \
 444
 445 PIX_SAD(mmx)
 446 PIX_SAD(mmxext)
 447
 448 #endif /* HAVE_INLINE_ASM */
 449
 450 av_cold void ff_dsputil_init_pix_mmx(DSPContext *c, AVCodecContext *avctx)
 451 {
 452 #if HAVE_INLINE_ASM
 453     int cpu_flags = av_get_cpu_flags();
 454
 455     if (INLINE_MMX(cpu_flags)) {
 456         c->pix_abs[0][0] = sad16_mmx;
 457         c->pix_abs[0][1] = sad16_x2_mmx;
 458         c->pix_abs[0][2] = sad16_y2_mmx;
 459         c->pix_abs[0][3] = sad16_xy2_mmx;
 460         c->pix_abs[1][0] = sad8_mmx;
 461         c->pix_abs[1][1] = sad8_x2_mmx;
 462         c->pix_abs[1][2] = sad8_y2_mmx;
 463         c->pix_abs[1][3] = sad8_xy2_mmx;
 464
 465         c->sad[0] = sad16_mmx;
 466         c->sad[1] = sad8_mmx;
 467     }
 468     if (INLINE_MMXEXT(cpu_flags)) {
 469         c->pix_abs[0][0] = sad16_mmxext;
 470         c->pix_abs[1][0] = sad8_mmxext;
 471
 472         c->sad[0] = sad16_mmxext;
 473         c->sad[1] = sad8_mmxext;
 474
 475         if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
 476             c->pix_abs[0][1] = sad16_x2_mmxext;
 477             c->pix_abs[0][2] = sad16_y2_mmxext;
 478             c->pix_abs[0][3] = sad16_xy2_mmxext;
 479             c->pix_abs[1][1] = sad8_x2_mmxext;
 480             c->pix_abs[1][2] = sad8_y2_mmxext;
 481             c->pix_abs[1][3] = sad8_xy2_mmxext;
 482         }
 483     }
 484     if (INLINE_SSE2(cpu_flags) && !(cpu_flags & AV_CPU_FLAG_3DNOW) && avctx->codec_id != AV_CODEC_ID_SNOW) {
 485         c->sad[0] = sad16_sse2;
 486     }
 487 #endif /* HAVE_INLINE_ASM */
 488 }