FFmpeg
cavsdsp.c
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1 /*
2  * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
3  * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
4  *
5  * MMX-optimized DSP functions, based on H.264 optimizations by
6  * Michael Niedermayer and Loren Merritt
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/common.h"
27 #include "libavutil/cpu.h"
28 #include "libavutil/mem_internal.h"
29 #include "libavutil/x86/asm.h"
30 #include "libavutil/x86/cpu.h"
31 #include "libavcodec/cavsdsp.h"
32 #include "libavcodec/idctdsp.h"
33 #include "constants.h"
34 #include "fpel.h"
35 #include "idctdsp.h"
36 #include "config.h"
37 
38 
39 #if HAVE_SSE2_EXTERNAL
40 
41 void ff_cavs_idct8_sse2(int16_t *out, const int16_t *in);
42 
43 static void cavs_idct8_add_sse2(uint8_t *dst, int16_t *block, ptrdiff_t stride)
44 {
45  LOCAL_ALIGNED(16, int16_t, b2, [64]);
46  ff_cavs_idct8_sse2(b2, block);
47  ff_add_pixels_clamped_sse2(b2, dst, stride);
48 }
49 
50 #endif /* HAVE_SSE2_EXTERNAL */
51 
52 #if HAVE_MMXEXT_INLINE
53 
54 /*****************************************************************************
55  *
56  * motion compensation
57  *
58  ****************************************************************************/
59 
60 /* vertical filter [-1 -2 96 42 -7 0] */
61 #define QPEL_CAVSV1(A,B,C,D,E,F,OP,ADD, MUL1, MUL2) \
62  "movd (%0), "#F" \n\t"\
63  "movq "#C", %%mm6 \n\t"\
64  "pmullw "MANGLE(MUL1)", %%mm6\n\t"\
65  "movq "#D", %%mm7 \n\t"\
66  "pmullw "MANGLE(MUL2)", %%mm7\n\t"\
67  "psllw $3, "#E" \n\t"\
68  "psubw "#E", %%mm6 \n\t"\
69  "psraw $3, "#E" \n\t"\
70  "paddw %%mm7, %%mm6 \n\t"\
71  "paddw "#E", %%mm6 \n\t"\
72  "paddw "#B", "#B" \n\t"\
73  "pxor %%mm7, %%mm7 \n\t"\
74  "add %2, %0 \n\t"\
75  "punpcklbw %%mm7, "#F" \n\t"\
76  "psubw "#B", %%mm6 \n\t"\
77  "psraw $1, "#B" \n\t"\
78  "psubw "#A", %%mm6 \n\t"\
79  "paddw "MANGLE(ADD)", %%mm6 \n\t"\
80  "psraw $7, %%mm6 \n\t"\
81  "packuswb %%mm6, %%mm6 \n\t"\
82  OP(%%mm6, (%1), A, d) \
83  "add %3, %1 \n\t"
84 
85 /* vertical filter [ 0 -1 5 5 -1 0] */
86 #define QPEL_CAVSV2(A,B,C,D,E,F,OP,ADD, MUL1, MUL2) \
87  "movd (%0), "#F" \n\t"\
88  "movq "#C", %%mm6 \n\t"\
89  "paddw "#D", %%mm6 \n\t"\
90  "pmullw "MANGLE(MUL1)", %%mm6\n\t"\
91  "add %2, %0 \n\t"\
92  "punpcklbw %%mm7, "#F" \n\t"\
93  "psubw "#B", %%mm6 \n\t"\
94  "psubw "#E", %%mm6 \n\t"\
95  "paddw "MANGLE(ADD)", %%mm6 \n\t"\
96  "psraw $3, %%mm6 \n\t"\
97  "packuswb %%mm6, %%mm6 \n\t"\
98  OP(%%mm6, (%1), A, d) \
99  "add %3, %1 \n\t"
100 
101 /* vertical filter [ 0 -7 42 96 -2 -1] */
102 #define QPEL_CAVSV3(A,B,C,D,E,F,OP,ADD, MUL1, MUL2) \
103  "movd (%0), "#F" \n\t"\
104  "movq "#C", %%mm6 \n\t"\
105  "pmullw "MANGLE(MUL2)", %%mm6\n\t"\
106  "movq "#D", %%mm7 \n\t"\
107  "pmullw "MANGLE(MUL1)", %%mm7\n\t"\
108  "psllw $3, "#B" \n\t"\
109  "psubw "#B", %%mm6 \n\t"\
110  "psraw $3, "#B" \n\t"\
111  "paddw %%mm7, %%mm6 \n\t"\
112  "paddw "#B", %%mm6 \n\t"\
113  "paddw "#E", "#E" \n\t"\
114  "pxor %%mm7, %%mm7 \n\t"\
115  "add %2, %0 \n\t"\
116  "punpcklbw %%mm7, "#F" \n\t"\
117  "psubw "#E", %%mm6 \n\t"\
118  "psraw $1, "#E" \n\t"\
119  "psubw "#F", %%mm6 \n\t"\
120  "paddw "MANGLE(ADD)", %%mm6 \n\t"\
121  "psraw $7, %%mm6 \n\t"\
122  "packuswb %%mm6, %%mm6 \n\t"\
123  OP(%%mm6, (%1), A, d) \
124  "add %3, %1 \n\t"
125 
126 
127 #define QPEL_CAVSVNUM(VOP,OP,ADD,MUL1,MUL2)\
128  int w= 2;\
129  src -= 2*srcStride;\
130  \
131  while(w--){\
132  __asm__ volatile(\
133  "pxor %%mm7, %%mm7 \n\t"\
134  "movd (%0), %%mm0 \n\t"\
135  "add %2, %0 \n\t"\
136  "movd (%0), %%mm1 \n\t"\
137  "add %2, %0 \n\t"\
138  "movd (%0), %%mm2 \n\t"\
139  "add %2, %0 \n\t"\
140  "movd (%0), %%mm3 \n\t"\
141  "add %2, %0 \n\t"\
142  "movd (%0), %%mm4 \n\t"\
143  "add %2, %0 \n\t"\
144  "punpcklbw %%mm7, %%mm0 \n\t"\
145  "punpcklbw %%mm7, %%mm1 \n\t"\
146  "punpcklbw %%mm7, %%mm2 \n\t"\
147  "punpcklbw %%mm7, %%mm3 \n\t"\
148  "punpcklbw %%mm7, %%mm4 \n\t"\
149  VOP(%%mm0, %%mm1, %%mm2, %%mm3, %%mm4, %%mm5, OP, ADD, MUL1, MUL2)\
150  VOP(%%mm1, %%mm2, %%mm3, %%mm4, %%mm5, %%mm0, OP, ADD, MUL1, MUL2)\
151  VOP(%%mm2, %%mm3, %%mm4, %%mm5, %%mm0, %%mm1, OP, ADD, MUL1, MUL2)\
152  VOP(%%mm3, %%mm4, %%mm5, %%mm0, %%mm1, %%mm2, OP, ADD, MUL1, MUL2)\
153  VOP(%%mm4, %%mm5, %%mm0, %%mm1, %%mm2, %%mm3, OP, ADD, MUL1, MUL2)\
154  VOP(%%mm5, %%mm0, %%mm1, %%mm2, %%mm3, %%mm4, OP, ADD, MUL1, MUL2)\
155  VOP(%%mm0, %%mm1, %%mm2, %%mm3, %%mm4, %%mm5, OP, ADD, MUL1, MUL2)\
156  VOP(%%mm1, %%mm2, %%mm3, %%mm4, %%mm5, %%mm0, OP, ADD, MUL1, MUL2)\
157  \
158  : "+a"(src), "+c"(dst)\
159  : "S"((x86_reg)srcStride), "r"((x86_reg)dstStride)\
160  NAMED_CONSTRAINTS_ADD(ADD,MUL1,MUL2)\
161  : "memory"\
162  );\
163  if(h==16){\
164  __asm__ volatile(\
165  VOP(%%mm2, %%mm3, %%mm4, %%mm5, %%mm0, %%mm1, OP, ADD, MUL1, MUL2)\
166  VOP(%%mm3, %%mm4, %%mm5, %%mm0, %%mm1, %%mm2, OP, ADD, MUL1, MUL2)\
167  VOP(%%mm4, %%mm5, %%mm0, %%mm1, %%mm2, %%mm3, OP, ADD, MUL1, MUL2)\
168  VOP(%%mm5, %%mm0, %%mm1, %%mm2, %%mm3, %%mm4, OP, ADD, MUL1, MUL2)\
169  VOP(%%mm0, %%mm1, %%mm2, %%mm3, %%mm4, %%mm5, OP, ADD, MUL1, MUL2)\
170  VOP(%%mm1, %%mm2, %%mm3, %%mm4, %%mm5, %%mm0, OP, ADD, MUL1, MUL2)\
171  VOP(%%mm2, %%mm3, %%mm4, %%mm5, %%mm0, %%mm1, OP, ADD, MUL1, MUL2)\
172  VOP(%%mm3, %%mm4, %%mm5, %%mm0, %%mm1, %%mm2, OP, ADD, MUL1, MUL2)\
173  \
174  : "+a"(src), "+c"(dst)\
175  : "S"((x86_reg)srcStride), "r"((x86_reg)dstStride)\
176  NAMED_CONSTRAINTS_ADD(ADD,MUL1,MUL2)\
177  : "memory"\
178  );\
179  }\
180  src += 4-(h+5)*srcStride;\
181  dst += 4-h*dstStride;\
182  }
183 
184 #define QPEL_CAVS(OPNAME, OP, MMX)\
185 static void OPNAME ## cavs_qpel8_h_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
186 {\
187  int h=8;\
188  __asm__ volatile(\
189  "pxor %%mm7, %%mm7 \n\t"\
190  "movq "MANGLE(ff_pw_5)", %%mm6\n\t"\
191  "1: \n\t"\
192  "movq (%0), %%mm0 \n\t"\
193  "movq 1(%0), %%mm2 \n\t"\
194  "movq %%mm0, %%mm1 \n\t"\
195  "movq %%mm2, %%mm3 \n\t"\
196  "punpcklbw %%mm7, %%mm0 \n\t"\
197  "punpckhbw %%mm7, %%mm1 \n\t"\
198  "punpcklbw %%mm7, %%mm2 \n\t"\
199  "punpckhbw %%mm7, %%mm3 \n\t"\
200  "paddw %%mm2, %%mm0 \n\t"\
201  "paddw %%mm3, %%mm1 \n\t"\
202  "pmullw %%mm6, %%mm0 \n\t"\
203  "pmullw %%mm6, %%mm1 \n\t"\
204  "movq -1(%0), %%mm2 \n\t"\
205  "movq 2(%0), %%mm4 \n\t"\
206  "movq %%mm2, %%mm3 \n\t"\
207  "movq %%mm4, %%mm5 \n\t"\
208  "punpcklbw %%mm7, %%mm2 \n\t"\
209  "punpckhbw %%mm7, %%mm3 \n\t"\
210  "punpcklbw %%mm7, %%mm4 \n\t"\
211  "punpckhbw %%mm7, %%mm5 \n\t"\
212  "paddw %%mm4, %%mm2 \n\t"\
213  "paddw %%mm3, %%mm5 \n\t"\
214  "psubw %%mm2, %%mm0 \n\t"\
215  "psubw %%mm5, %%mm1 \n\t"\
216  "movq "MANGLE(ff_pw_4)", %%mm5\n\t"\
217  "paddw %%mm5, %%mm0 \n\t"\
218  "paddw %%mm5, %%mm1 \n\t"\
219  "psraw $3, %%mm0 \n\t"\
220  "psraw $3, %%mm1 \n\t"\
221  "packuswb %%mm1, %%mm0 \n\t"\
222  OP(%%mm0, (%1),%%mm5, q) \
223  "add %3, %0 \n\t"\
224  "add %4, %1 \n\t"\
225  "decl %2 \n\t"\
226  " jnz 1b \n\t"\
227  : "+a"(src), "+c"(dst), "+m"(h)\
228  : "d"((x86_reg)srcStride), "S"((x86_reg)dstStride)\
229  NAMED_CONSTRAINTS_ADD(ff_pw_4,ff_pw_5)\
230  : "memory"\
231  );\
232 }\
233 \
234 static inline void OPNAME ## cavs_qpel8or16_v1_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)\
235 { \
236  QPEL_CAVSVNUM(QPEL_CAVSV1,OP,ff_pw_64,ff_pw_96,ff_pw_42) \
237 }\
238 \
239 static inline void OPNAME ## cavs_qpel8or16_v2_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)\
240 { \
241  QPEL_CAVSVNUM(QPEL_CAVSV2,OP,ff_pw_4,ff_pw_5,ff_pw_42) \
242 }\
243 \
244 static inline void OPNAME ## cavs_qpel8or16_v3_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)\
245 { \
246  QPEL_CAVSVNUM(QPEL_CAVSV3,OP,ff_pw_64,ff_pw_96,ff_pw_42) \
247 }\
248 \
249 static void OPNAME ## cavs_qpel8_v1_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
250 { \
251  OPNAME ## cavs_qpel8or16_v1_ ## MMX(dst , src , dstStride, srcStride, 8);\
252 }\
253 static void OPNAME ## cavs_qpel16_v1_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
254 { \
255  OPNAME ## cavs_qpel8or16_v1_ ## MMX(dst , src , dstStride, srcStride, 16);\
256  OPNAME ## cavs_qpel8or16_v1_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
257 }\
258 \
259 static void OPNAME ## cavs_qpel8_v2_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
260 { \
261  OPNAME ## cavs_qpel8or16_v2_ ## MMX(dst , src , dstStride, srcStride, 8);\
262 }\
263 static void OPNAME ## cavs_qpel16_v2_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
264 { \
265  OPNAME ## cavs_qpel8or16_v2_ ## MMX(dst , src , dstStride, srcStride, 16);\
266  OPNAME ## cavs_qpel8or16_v2_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
267 }\
268 \
269 static void OPNAME ## cavs_qpel8_v3_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
270 { \
271  OPNAME ## cavs_qpel8or16_v3_ ## MMX(dst , src , dstStride, srcStride, 8);\
272 }\
273 static void OPNAME ## cavs_qpel16_v3_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
274 { \
275  OPNAME ## cavs_qpel8or16_v3_ ## MMX(dst , src , dstStride, srcStride, 16);\
276  OPNAME ## cavs_qpel8or16_v3_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
277 }\
278 \
279 static void OPNAME ## cavs_qpel16_h_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride)\
280 { \
281  OPNAME ## cavs_qpel8_h_ ## MMX(dst , src , dstStride, srcStride);\
282  OPNAME ## cavs_qpel8_h_ ## MMX(dst+8, src+8, dstStride, srcStride);\
283  src += 8*srcStride;\
284  dst += 8*dstStride;\
285  OPNAME ## cavs_qpel8_h_ ## MMX(dst , src , dstStride, srcStride);\
286  OPNAME ## cavs_qpel8_h_ ## MMX(dst+8, src+8, dstStride, srcStride);\
287 }\
288 
289 #define CAVS_MC(OPNAME, SIZE, MMX) \
290 static void OPNAME ## cavs_qpel ## SIZE ## _mc20_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
291 {\
292  OPNAME ## cavs_qpel ## SIZE ## _h_ ## MMX(dst, src, stride, stride);\
293 }\
294 \
295 static void OPNAME ## cavs_qpel ## SIZE ## _mc01_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
296 {\
297  OPNAME ## cavs_qpel ## SIZE ## _v1_ ## MMX(dst, src, stride, stride);\
298 }\
299 \
300 static void OPNAME ## cavs_qpel ## SIZE ## _mc02_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
301 {\
302  OPNAME ## cavs_qpel ## SIZE ## _v2_ ## MMX(dst, src, stride, stride);\
303 }\
304 \
305 static void OPNAME ## cavs_qpel ## SIZE ## _mc03_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
306 {\
307  OPNAME ## cavs_qpel ## SIZE ## _v3_ ## MMX(dst, src, stride, stride);\
308 }\
309 
310 #define PUT_OP(a,b,temp, size) "mov" #size " " #a ", " #b " \n\t"
311 #define AVG_MMXEXT_OP(a, b, temp, size) \
312 "mov" #size " " #b ", " #temp " \n\t"\
313 "pavgb " #temp ", " #a " \n\t"\
314 "mov" #size " " #a ", " #b " \n\t"
315 
316 #endif /* HAVE_MMXEXT_INLINE */
317 
318 #if HAVE_MMX_EXTERNAL
319 static void put_cavs_qpel8_mc00_mmx(uint8_t *dst, const uint8_t *src,
320  ptrdiff_t stride)
321 {
322  ff_put_pixels8_mmx(dst, src, stride, 8);
323 }
324 
325 static void avg_cavs_qpel8_mc00_mmxext(uint8_t *dst, const uint8_t *src,
326  ptrdiff_t stride)
327 {
328  ff_avg_pixels8_mmxext(dst, src, stride, 8);
329 }
330 
331 static void put_cavs_qpel16_mc00_sse2(uint8_t *dst, const uint8_t *src,
332  ptrdiff_t stride)
333 {
334  ff_put_pixels16_sse2(dst, src, stride, 16);
335 }
336 
337 static void avg_cavs_qpel16_mc00_sse2(uint8_t *dst, const uint8_t *src,
338  ptrdiff_t stride)
339 {
340  ff_avg_pixels16_sse2(dst, src, stride, 16);
341 }
342 #endif
343 
344 static av_cold void cavsdsp_init_mmx(CAVSDSPContext *c)
345 {
346 #if HAVE_MMX_EXTERNAL
347  c->put_cavs_qpel_pixels_tab[1][0] = put_cavs_qpel8_mc00_mmx;
348 #endif /* HAVE_MMX_EXTERNAL */
349 }
350 
351 #define DSPFUNC(PFX, IDX, NUM, EXT) \
352  c->PFX ## _cavs_qpel_pixels_tab[IDX][ 2] = PFX ## _cavs_qpel ## NUM ## _mc20_ ## EXT; \
353  c->PFX ## _cavs_qpel_pixels_tab[IDX][ 4] = PFX ## _cavs_qpel ## NUM ## _mc01_ ## EXT; \
354  c->PFX ## _cavs_qpel_pixels_tab[IDX][ 8] = PFX ## _cavs_qpel ## NUM ## _mc02_ ## EXT; \
355  c->PFX ## _cavs_qpel_pixels_tab[IDX][12] = PFX ## _cavs_qpel ## NUM ## _mc03_ ## EXT; \
356 
357 #if HAVE_MMXEXT_INLINE
358 QPEL_CAVS(put_, PUT_OP, mmxext)
359 QPEL_CAVS(avg_, AVG_MMXEXT_OP, mmxext)
360 
361 CAVS_MC(put_, 8, mmxext)
362 CAVS_MC(put_, 16, mmxext)
363 CAVS_MC(avg_, 8, mmxext)
364 CAVS_MC(avg_, 16, mmxext)
365 #endif /* HAVE_MMXEXT_INLINE */
366 
367 av_cold void ff_cavsdsp_init_x86(CAVSDSPContext *c)
368 {
369  av_unused int cpu_flags = av_get_cpu_flags();
370 
371  if (X86_MMX(cpu_flags))
372  cavsdsp_init_mmx(c);
373 
374 #if HAVE_MMXEXT_INLINE
375  if (INLINE_MMXEXT(cpu_flags)) {
376  DSPFUNC(put, 0, 16, mmxext);
377  DSPFUNC(put, 1, 8, mmxext);
378  DSPFUNC(avg, 0, 16, mmxext);
379  DSPFUNC(avg, 1, 8, mmxext);
380  }
381 #endif
382 #if HAVE_MMX_EXTERNAL
383  if (EXTERNAL_MMXEXT(cpu_flags)) {
384  c->avg_cavs_qpel_pixels_tab[1][0] = avg_cavs_qpel8_mc00_mmxext;
385  }
386 #endif
387 #if HAVE_SSE2_EXTERNAL
388  if (EXTERNAL_SSE2(cpu_flags)) {
389  c->put_cavs_qpel_pixels_tab[0][0] = put_cavs_qpel16_mc00_sse2;
390  c->avg_cavs_qpel_pixels_tab[0][0] = avg_cavs_qpel16_mc00_sse2;
391 
392  c->cavs_idct8_add = cavs_idct8_add_sse2;
393  c->idct_perm = FF_IDCT_PERM_TRANSPOSE;
394  }
395 #endif
396 }
ff_put_pixels8_mmx
void ff_put_pixels8_mmx(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
cpu.h
mem_internal.h
out
FILE * out
Definition: movenc.c:54
av_unused
#define av_unused
Definition: attributes.h:131
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:103
cpu_flags
static atomic_int cpu_flags
Definition: cpu.c:52
CAVSDSPContext
Definition: cavsdsp.h:30
av_cold
#define av_cold
Definition: attributes.h:90
ff_cavsdsp_init_x86
av_cold void ff_cavsdsp_init_x86(CAVSDSPContext *c)
Definition: cavsdsp.c:367
LOCAL_ALIGNED
#define LOCAL_ALIGNED(a, t, v,...)
Definition: mem_internal.h:112
ff_avg_pixels8_mmxext
void ff_avg_pixels8_mmxext(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
ff_put_pixels16_sse2
void ff_put_pixels16_sse2(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
cavsdsp_init_mmx
static av_cold void cavsdsp_init_mmx(CAVSDSPContext *c)
Definition: cavsdsp.c:344
ff_add_pixels_clamped_sse2
void ff_add_pixels_clamped_sse2(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
constants.h
CAVS_MC
#define CAVS_MC(OPNAME, SIZE)
Definition: cavsdsp.c:438
ff_avg_pixels16_sse2
void ff_avg_pixels16_sse2(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
cpu.h
asm.h
avg
#define avg(a, b, c, d)
Definition: colorspacedsp_template.c:28
b2
static double b2(void *priv, double x, double y)
Definition: vf_xfade.c:1772
attributes.h
EXTERNAL_SSE2
#define EXTERNAL_SSE2(flags)
Definition: cpu.h:59
common.h
idctdsp.h
stride
#define stride
Definition: h264pred_template.c:537
FF_IDCT_PERM_TRANSPOSE
@ FF_IDCT_PERM_TRANSPOSE
Definition: idctdsp.h:32
DSPFUNC
#define DSPFUNC(PFX, IDX, NUM, EXT)
Definition: cavsdsp.c:351
fpel.h
INLINE_MMXEXT
#define INLINE_MMXEXT(flags)
Definition: cpu.h:88
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
X86_MMX
#define X86_MMX(flags)
Definition: cpu.h:30
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
EXTERNAL_MMXEXT
#define EXTERNAL_MMXEXT(flags)
Definition: cpu.h:57
cavsdsp.h
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