FFmpeg
checkasm.h
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1 /*
2  * Assembly testing and benchmarking tool
3  * Copyright (c) 2015 Henrik Gramner
4  * Copyright (c) 2008 Loren Merritt
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License along
19  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21  */
22 
23 #ifndef TESTS_CHECKASM_CHECKASM_H
24 #define TESTS_CHECKASM_CHECKASM_H
25 
26 #include <stdint.h>
27 #include "config.h"
28 
29 #if CONFIG_LINUX_PERF
30 #include <unistd.h> // read(3)
31 #include <sys/ioctl.h>
32 #include <asm/unistd.h>
33 #include <linux/perf_event.h>
34 #elif CONFIG_MACOS_KPERF
35 #include "libavutil/macos_kperf.h"
36 #endif
37 
38 #include "libavutil/avstring.h"
39 #include "libavutil/cpu.h"
40 #include "libavutil/emms.h"
41 #include "libavutil/internal.h"
42 #include "libavutil/lfg.h"
43 #include "libavutil/timer.h"
44 
45 #ifdef _WIN32
46 #include <windows.h>
47 #if defined(__i386__) || defined(_M_IX86)
48 #include <setjmp.h>
49 typedef jmp_buf checkasm_context;
50 #define checkasm_save_context() checkasm_handle_signal(setjmp(checkasm_context_buf))
51 #define checkasm_load_context(s) longjmp(checkasm_context_buf, s)
52 #elif WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
53 /* setjmp/longjmp on Windows on architectures using SEH (all except x86_32)
54  * will try to use SEH to unwind the stack, which doesn't work for assembly
55  * functions without unwind information. */
56 typedef struct { CONTEXT c; int status; } checkasm_context;
57 #define checkasm_save_context() \
58  (checkasm_context_buf.status = 0, \
59  RtlCaptureContext(&checkasm_context_buf.c), \
60  checkasm_handle_signal(checkasm_context_buf.status))
61 #define checkasm_load_context(s) \
62  (checkasm_context_buf.status = s, \
63  RtlRestoreContext(&checkasm_context_buf.c, NULL))
64 #else
65 #define checkasm_context void*
66 #define checkasm_save_context() 0
67 #define checkasm_load_context() do {} while (0)
68 #endif
69 #elif defined(_WASI_EMULATED_SIGNAL)
70 #define checkasm_context void*
71 #define checkasm_save_context() 0
72 #define checkasm_load_context() do {} while (0)
73 #else
74 #include <setjmp.h>
75 typedef sigjmp_buf checkasm_context;
76 #define checkasm_save_context() checkasm_handle_signal(sigsetjmp(checkasm_context_buf, 1))
77 #define checkasm_load_context(s) siglongjmp(checkasm_context_buf, s)
78 #endif
79 
80 void checkasm_check_aacencdsp(void);
81 void checkasm_check_aacpsdsp(void);
82 void checkasm_check_ac3dsp(void);
83 void checkasm_check_aes(void);
84 void checkasm_check_afir(void);
85 void checkasm_check_alacdsp(void);
86 void checkasm_check_apv_dsp(void);
87 void checkasm_check_audiodsp(void);
88 void checkasm_check_av_tx(void);
89 void checkasm_check_blackdetect(void);
90 void checkasm_check_blend(void);
91 void checkasm_check_blockdsp(void);
92 void checkasm_check_bswapdsp(void);
93 void checkasm_check_cavsdsp(void);
94 void checkasm_check_colordetect(void);
95 void checkasm_check_colorspace(void);
96 void checkasm_check_crc(void);
97 void checkasm_check_dcadsp(void);
98 void checkasm_check_diracdsp(void);
99 void checkasm_check_exrdsp(void);
100 void checkasm_check_fdctdsp(void);
101 void checkasm_check_fixed_dsp(void);
102 void checkasm_check_flacdsp(void);
103 void checkasm_check_float_dsp(void);
104 void checkasm_check_fmtconvert(void);
105 void checkasm_check_g722dsp(void);
106 void checkasm_check_h263dsp(void);
107 void checkasm_check_h264chroma(void);
108 void checkasm_check_h264dsp(void);
109 void checkasm_check_h264pred(void);
110 void checkasm_check_h264qpel(void);
111 void checkasm_check_hevc_add_res(void);
112 void checkasm_check_hevc_deblock(void);
113 void checkasm_check_hevc_dequant(void);
114 void checkasm_check_hevc_idct(void);
115 void checkasm_check_hevc_pel(void);
116 void checkasm_check_hevc_sao(void);
117 void checkasm_check_hpeldsp(void);
118 void checkasm_check_huffyuvdsp(void);
119 void checkasm_check_idctdsp(void);
120 void checkasm_check_idet(void);
121 void checkasm_check_jpeg2000dsp(void);
122 void checkasm_check_llauddsp(void);
123 void checkasm_check_lls(void);
124 void checkasm_check_llviddsp(void);
125 void checkasm_check_llvidencdsp(void);
126 void checkasm_check_lpc(void);
127 void checkasm_check_motion(void);
128 void checkasm_check_mpegvideo_unquantize(void);
129 void checkasm_check_mpegvideoencdsp(void);
130 void checkasm_check_nlmeans(void);
131 void checkasm_check_opusdsp(void);
132 void checkasm_check_pixblockdsp(void);
133 void checkasm_check_png(void);
134 void checkasm_check_qpeldsp(void);
135 void checkasm_check_sbrdsp(void);
136 void checkasm_check_rv34dsp(void);
137 void checkasm_check_rv40dsp(void);
138 void checkasm_check_scene_sad(void);
139 void checkasm_check_svq1enc(void);
140 void checkasm_check_synth_filter(void);
141 void checkasm_check_sw_gbrp(void);
142 void checkasm_check_sw_range_convert(void);
143 void checkasm_check_sw_rgb(void);
144 void checkasm_check_sw_scale(void);
145 void checkasm_check_sw_xyz2rgb(void);
146 void checkasm_check_sw_yuv2rgb(void);
147 void checkasm_check_sw_yuv2yuv(void);
148 void checkasm_check_sw_ops(void);
149 void checkasm_check_takdsp(void);
150 void checkasm_check_utvideodsp(void);
151 void checkasm_check_v210dec(void);
152 void checkasm_check_v210enc(void);
153 void checkasm_check_vc1dsp(void);
154 void checkasm_check_vf_bwdif(void);
155 void checkasm_check_vf_eq(void);
156 void checkasm_check_vf_fspp(void);
157 void checkasm_check_vf_gblur(void);
158 void checkasm_check_vf_hflip(void);
159 void checkasm_check_vf_threshold(void);
160 void checkasm_check_vf_sobel(void);
161 void checkasm_check_vp3dsp(void);
162 void checkasm_check_vp6dsp(void);
163 void checkasm_check_vp8dsp(void);
164 void checkasm_check_vp9dsp(void);
165 void checkasm_check_vp9_ipred(void);
166 void checkasm_check_vp9_itxfm(void);
167 void checkasm_check_vp9_loopfilter(void);
168 void checkasm_check_vp9_mc(void);
169 void checkasm_check_videodsp(void);
170 void checkasm_check_vorbisdsp(void);
171 void checkasm_check_vvc_alf(void);
172 void checkasm_check_vvc_mc(void);
173 void checkasm_check_vvc_sao(void);
174 
175 struct CheckasmPerf;
176 
177 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
178 int checkasm_bench_func(void);
179 int checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
180 struct CheckasmPerf *checkasm_get_perf_context(void);
181 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
182 void checkasm_set_signal_handler_state(int enabled);
183 int checkasm_handle_signal(int s);
184 extern checkasm_context checkasm_context_buf;
185 
186 /* float compare utilities */
187 int float_near_ulp(float a, float b, unsigned max_ulp);
188 int float_near_abs_eps(float a, float b, float eps);
189 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
190 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
191  unsigned len);
192 int float_near_abs_eps_array(const float *a, const float *b, float eps,
193  unsigned len);
194 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
195  unsigned max_ulp, unsigned len);
196 int double_near_abs_eps(double a, double b, double eps);
197 int double_near_abs_eps_array(const double *a, const double *b, double eps,
198  unsigned len);
199 
200 extern AVLFG checkasm_lfg;
201 #define rnd() av_lfg_get(&checkasm_lfg)
202 
203 av_unused static void *func_ref, *func_new;
204 
205 extern uint64_t bench_runs;
206 
207 /* Decide whether or not the specified function needs to be tested */
208 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
209 #define check_key(key, ...) (checkasm_save_context(), checkasm_check_func(key, __VA_ARGS__))
210 
211 /* Declare the function prototype. The first argument is the return value, the remaining
212  * arguments are the function parameters. Naming parameters is optional. */
213 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
214 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
215 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
216 
217 /* Indicate that the current test has failed */
218 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
219 
220 /* Print the test outcome */
221 #define report checkasm_report
222 
223 /* Call the reference function */
224 #define call_ref(...)\
225  checkasm_call((func_type *)func_ref, __VA_ARGS__)
226 
227 #define checkasm_call(func, ...) \
228  (checkasm_set_signal_handler_state(1),\
229  (func)(__VA_ARGS__));\
230  checkasm_set_signal_handler_state(0)
231 
232 #define call_new(...) checkasm_call_checked(((func_type *)func_new), __VA_ARGS__)
233 
234 #if ARCH_X86 && HAVE_X86ASM
235 /* Verifies that clobbered callee-saved registers are properly saved and restored
236  * and that either no MMX registers are touched or emms is issued */
237 void checkasm_checked_call(void *func, ...);
238 /* Verifies that clobbered callee-saved registers are properly saved and restored
239  * and issues emms for asm functions which are not required to do so */
240 void checkasm_checked_call_emms(void *func, ...);
241 /* Verifies that clobbered callee-saved registers are properly saved and restored
242  * but doesn't issue emms. Meant for dsp functions returning float or double */
243 void checkasm_checked_call_float(void *func, ...);
244 
245 #if ARCH_X86_64
246 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
247  * This is done by clobbering the stack with junk around the stack pointer and calling the
248  * assembly function through checked_call() with added dummy arguments which forces all
249  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
250  * upper half of the 64-bit register locations on the stack will now contain junk which will
251  * cause misbehaving functions to either produce incorrect output or segfault. Note that
252  * even though this works extremely well in practice, it's technically not guaranteed
253  * and false negatives is theoretically possible, but there can never be any false positives.
254  */
255 void checkasm_stack_clobber(uint64_t clobber, ...);
256 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
257  = (void *)checkasm_checked_call;
258 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
259  = (void *)checkasm_checked_call_float;
260 #define declare_new_emms(cpu_flags, ret, ...) \
261  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
262  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
263  (void *)checkasm_checked_call;
264 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
265 #define checkasm_call_checked(func, ...) \
266  (checkasm_set_signal_handler_state(1),\
267  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
268  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
269  checked_call((func), 0, 0, 0, 0, 0, __VA_ARGS__));\
270  checkasm_set_signal_handler_state(0)
271 #elif ARCH_X86_32
272 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
273 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
274 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
275  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
276  (void *)checkasm_checked_call;
277 #define checkasm_call_checked(func, ...)\
278  (checkasm_set_signal_handler_state(1),\
279  checked_call((func), __VA_ARGS__));\
280  checkasm_set_signal_handler_state(0)
281 #endif
282 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
283 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
284  * This makes sure that potential 8-byte-alignment of parameters is kept the same
285  * even when the extra parameters have been removed. */
286 void checkasm_checked_call_vfp(void *func, int dummy, ...);
287 void checkasm_checked_call_novfp(void *func, int dummy, ...);
288 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
289 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
290  int, int, int, int, int, int, int, int, \
291  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
292 #define checkasm_call_checked(func, ...) \
293  (checkasm_set_signal_handler_state(1),\
294  checked_call((func), 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
295  checkasm_set_signal_handler_state(0)
296 #elif ARCH_AARCH64 && !defined(__APPLE__)
297 void checkasm_stack_clobber(uint64_t clobber, ...);
298 void checkasm_checked_call(void *func, ...);
299 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
300  int, int, int, int, int, int, int, int,\
301  int, int, int, int, int, int, int)\
302  = (void *)checkasm_checked_call;
303 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
304 #define checkasm_call_checked(func, ...) (checkasm_set_signal_handler_state(1),\
305  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
306  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
307  checked_call((func), 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
308  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
309  checkasm_set_signal_handler_state(0)
310 #elif ARCH_RISCV
311 void checkasm_set_function(void *);
312 void *checkasm_get_wrapper(void);
313 
314 #if HAVE_RV
315 #define declare_new(ret, ...) \
316  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
317 #define checkasm_call_checked(func, ...) \
318  (checkasm_set_signal_handler_state(1),\
319  checkasm_set_function(func), checked_call(__VA_ARGS__));\
320  checkasm_set_signal_handler_state(0)
321 #else
322 #define declare_new(ret, ...)
323 #define checkasm_call_checked(func, ...)\
324  (checkasm_set_signal_handler_state(1),\
325  (func)(__VA_ARGS__));\
326  checkasm_set_signal_handler_state(0)
327 #endif
328 #else
329 #define declare_new(ret, ...)
330 #define declare_new_float(ret, ...)
331 #define declare_new_emms(cpu_flags, ret, ...)
332 /* Call the function */
333 #define checkasm_call_checked(func, ...)\
334  (checkasm_set_signal_handler_state(1),\
335  (func)(__VA_ARGS__));\
336  checkasm_set_signal_handler_state(0)
337 #endif
338 
339 #ifndef declare_new_emms
340 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
341 #endif
342 #ifndef declare_new_float
343 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
344 #endif
345 
346 typedef struct CheckasmPerf {
347  int sysfd;
348  uint64_t cycles;
349  int iterations;
350 } CheckasmPerf;
351 
352 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
353 
354 #if CONFIG_LINUX_PERF
355 #define PERF_START(t) do { \
356  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
357  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
358 } while (0)
359 #define PERF_STOP(t) do { \
360  int ret; \
361  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
362  ret = read(sysfd, &t, sizeof(t)); \
363  (void)ret; \
364 } while (0)
365 #elif CONFIG_MACOS_KPERF
366 #define PERF_START(t) t = ff_kperf_cycles()
367 #define PERF_STOP(t) t = ff_kperf_cycles() - t
368 #else
369 #define PERF_START(t) t = AV_READ_TIME()
370 #define PERF_STOP(t) t = AV_READ_TIME() - t
371 #endif
372 
373 #define CALL4(...)\
374  do {\
375  tfunc(__VA_ARGS__); \
376  tfunc(__VA_ARGS__); \
377  tfunc(__VA_ARGS__); \
378  tfunc(__VA_ARGS__); \
379  } while (0)
380 
381 #define CALL16(...)\
382  do {\
383  CALL4(__VA_ARGS__); \
384  CALL4(__VA_ARGS__); \
385  CALL4(__VA_ARGS__); \
386  CALL4(__VA_ARGS__); \
387  } while (0)
388 
389 /* Benchmark the function */
390 #define bench(func, ...)\
391  do {\
392  if (checkasm_bench_func()) {\
393  struct CheckasmPerf *perf = checkasm_get_perf_context();\
394  av_unused const int sysfd = perf->sysfd;\
395  func_type *tfunc = func;\
396  uint64_t tsum = 0;\
397  uint64_t ti, tcount = 0;\
398  uint64_t t = 0; \
399  const uint64_t truns = FFMAX(bench_runs >> 3, 1);\
400  checkasm_set_signal_handler_state(1);\
401  for (ti = 0; ti < truns; ti++) {\
402  PERF_START(t);\
403  CALL16(__VA_ARGS__);\
404  CALL16(__VA_ARGS__);\
405  PERF_STOP(t);\
406  if (t*tcount <= tsum*4 && ti > 0) {\
407  tsum += t;\
408  tcount++;\
409  }\
410  }\
411  emms_c();\
412  perf->cycles += tsum;\
413  perf->iterations += tcount;\
414  checkasm_set_signal_handler_state(0);\
415  }\
416  } while (0)
417 #else
418 #define bench(func, ...) while(0)
419 #define PERF_START(t) while(0)
420 #define PERF_STOP(t) while(0)
421 #endif
422 
423 #define bench_new(...) bench(func_new, __VA_ARGS__)
424 
425 #define BUF_RECT(type, name, w, h) \
426  LOCAL_ALIGNED_32(type, name##_buf, [((h)+32)*(FFALIGN(w,64)+64) + 64]); \
427  av_unused ptrdiff_t name##_stride = sizeof(type)*(FFALIGN(w,64)+64); \
428  av_unused int name##_buf_h = (h)+32; \
429  type *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
430 
431 #define PIXEL_RECT(name, w, h) \
432  LOCAL_ALIGNED_32(uint8_t, name##_buf, [sizeof(uint16_t) * (((h)+32)*(FFALIGN(w,64)+64) + 64)],); \
433  av_unused ptrdiff_t name##_stride = sizeof(uint16_t) * (FFALIGN(w,64)+64); \
434  av_unused int name##_buf_h = (h)+32; \
435  uint8_t *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
436 
437 #define CLEAR_BUF_RECT(name) \
438  memset(name##_buf, 0x99, name##_stride * name##_buf_h + 64)
439 #define CLEAR_PIXEL_RECT(name) \
440  CLEAR_BUF_RECT(name)
441 
442 #define DECL_CHECKASM_CHECK_FUNC(type) \
443 int checkasm_check_##type(const char *file, int line, \
444  const type *buf1, ptrdiff_t stride1, \
445  const type *buf2, ptrdiff_t stride2, \
446  int w, int h, const char *name, \
447  int align_w, int align_h, \
448  int padding)
449 
450 DECL_CHECKASM_CHECK_FUNC(uint8_t);
451 DECL_CHECKASM_CHECK_FUNC(uint16_t);
452 DECL_CHECKASM_CHECK_FUNC(uint32_t);
453 DECL_CHECKASM_CHECK_FUNC(int16_t);
454 DECL_CHECKASM_CHECK_FUNC(int32_t);
455 
456 int checkasm_check_float_ulp(const char *file, int line,
457  const float *buf1, ptrdiff_t stride1,
458  const float *buf2, ptrdiff_t stride2,
459  int w, int h, const char *name,
460  unsigned max_ulp, int align_w, int align_h,
461  int padding);
462 
463 #define PASTE(a,b) a ## b
464 #define CONCAT(a,b) PASTE(a,b)
465 
466 #define checkasm_check2(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
467 #define checkasm_check(prefix, ...) checkasm_check2(prefix, __VA_ARGS__, 0, 0, 0)
468 /* Check a pointer from BUF_RECT, checking whether there have been
469  * writes outside of the designated area. */
470 #define checkasm_check_padded(...) \
471  checkasm_check2(__VA_ARGS__, 1, 1, 8)
472 /* Check a pointer from BUF_RECT, checking whether there have been
473  * writes outside of the designated area. Allow writing slightly past the
474  * end of the buffer, by aligning w/h to align_w/align_h, and checking
475  * for overwrites outside of that. */
476 #define checkasm_check_padded_align(...) \
477  checkasm_check2(__VA_ARGS__, 8)
478 
479 /* This assumes that there is a local variable named "bit_depth".
480  * For tests that don't have that and only operate on a single
481  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
482 #define checkasm_check_pixel2(buf1, stride1, buf2, stride2, ...) \
483  ((bit_depth > 8) ? \
484  checkasm_check2(uint16_t, (const uint16_t*)buf1, stride1, \
485  (const uint16_t*)buf2, stride2, \
486  __VA_ARGS__) : \
487  checkasm_check2(uint8_t, (const uint8_t*) buf1, stride1, \
488  (const uint8_t*) buf2, stride2, \
489  __VA_ARGS__))
490 #define checkasm_check_pixel(...) \
491  checkasm_check_pixel2(__VA_ARGS__, 0, 0, 0)
492 #define checkasm_check_pixel_padded(...) \
493  checkasm_check_pixel2(__VA_ARGS__, 1, 1, 8)
494 #define checkasm_check_pixel_padded_align(...) \
495  checkasm_check_pixel2(__VA_ARGS__, 8)
496 
497 /* This assumes that there is a local variable named "bit_depth"
498  * and that the type-specific buffers obey the name ## _BITDEPTH
499  * convention.
500  * For tests that don't have that and only operate on a single
501  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
502 #define checkasm_check_dctcoef(buf1, stride1, buf2, stride2, ...) \
503  ((bit_depth > 8) ? \
504  checkasm_check(int32_t, buf1 ## _32, stride1, \
505  buf2 ## _32, stride2, \
506  __VA_ARGS__) : \
507  checkasm_check(int16_t, buf1 ## _16, stride1, \
508  buf2 ## _16, stride2, \
509  __VA_ARGS__))
510 
511 #endif /* TESTS_CHECKASM_CHECKASM_H */
checkasm_check_nlmeans
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Definition: vf_nlmeans.c:34
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it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
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s
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void checkasm_check_sw_rgb(void)
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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
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a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
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