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_huffyuvencdsp(void);
120 void checkasm_check_idctdsp(void);
121 void checkasm_check_idet(void);
122 void checkasm_check_jpeg2000dsp(void);
123 void checkasm_check_llauddsp(void);
124 void checkasm_check_lls(void);
125 void checkasm_check_llviddsp(void);
126 void checkasm_check_llvidencdsp(void);
127 void checkasm_check_lpc(void);
128 void checkasm_check_motion(void);
129 void checkasm_check_mpegvideo_unquantize(void);
130 void checkasm_check_mpegvideoencdsp(void);
131 void checkasm_check_nlmeans(void);
132 void checkasm_check_opusdsp(void);
133 void checkasm_check_pixblockdsp(void);
134 void checkasm_check_png(void);
135 void checkasm_check_qpeldsp(void);
136 void checkasm_check_sbrdsp(void);
137 void checkasm_check_rv34dsp(void);
138 void checkasm_check_rv40dsp(void);
139 void checkasm_check_scene_sad(void);
140 void checkasm_check_svq1enc(void);
141 void checkasm_check_synth_filter(void);
142 void checkasm_check_sw_gbrp(void);
143 void checkasm_check_sw_range_convert(void);
144 void checkasm_check_sw_rgb(void);
145 void checkasm_check_sw_scale(void);
146 void checkasm_check_sw_xyz2rgb(void);
147 void checkasm_check_sw_yuv2rgb(void);
148 void checkasm_check_sw_yuv2yuv(void);
149 void checkasm_check_sw_ops(void);
150 void checkasm_check_takdsp(void);
151 void checkasm_check_utvideodsp(void);
152 void checkasm_check_v210dec(void);
153 void checkasm_check_v210enc(void);
154 void checkasm_check_vc1dsp(void);
155 void checkasm_check_vf_bwdif(void);
156 void checkasm_check_vf_eq(void);
157 void checkasm_check_vf_fspp(void);
158 void checkasm_check_vf_gblur(void);
159 void checkasm_check_vf_hflip(void);
160 void checkasm_check_vf_threshold(void);
161 void checkasm_check_vf_sobel(void);
162 void checkasm_check_vp3dsp(void);
163 void checkasm_check_vp6dsp(void);
164 void checkasm_check_vp8dsp(void);
165 void checkasm_check_vp9dsp(void);
166 void checkasm_check_vp9_ipred(void);
167 void checkasm_check_vp9_itxfm(void);
168 void checkasm_check_vp9_loopfilter(void);
169 void checkasm_check_vp9_mc(void);
170 void checkasm_check_videodsp(void);
171 void checkasm_check_vorbisdsp(void);
172 void checkasm_check_vvc_alf(void);
173 void checkasm_check_vvc_mc(void);
174 void checkasm_check_vvc_sao(void);
175 
176 struct CheckasmPerf;
177 
178 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
179 int checkasm_bench_func(void);
180 int checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
181 struct CheckasmPerf *checkasm_get_perf_context(void);
182 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
183 void checkasm_set_signal_handler_state(int enabled);
184 int checkasm_handle_signal(int s);
185 extern checkasm_context checkasm_context_buf;
186 
187 /* float compare utilities */
188 int float_near_ulp(float a, float b, unsigned max_ulp);
189 int float_near_abs_eps(float a, float b, float eps);
190 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
191 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
192  unsigned len);
193 int float_near_abs_eps_array(const float *a, const float *b, float eps,
194  unsigned len);
195 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
196  unsigned max_ulp, unsigned len);
197 int double_near_abs_eps(double a, double b, double eps);
198 int double_near_abs_eps_array(const double *a, const double *b, double eps,
199  unsigned len);
200 
201 extern AVLFG checkasm_lfg;
202 #define rnd() av_lfg_get(&checkasm_lfg)
203 
204 av_unused static void *func_ref, *func_new;
205 
206 extern uint64_t bench_runs;
207 
208 /* Decide whether or not the specified function needs to be tested */
209 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
210 #define check_key(key, ...) (checkasm_save_context(), checkasm_check_func(key, __VA_ARGS__))
211 
212 /* Declare the function prototype. The first argument is the return value, the remaining
213  * arguments are the function parameters. Naming parameters is optional. */
214 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
215 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
216 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
217 
218 /* Indicate that the current test has failed */
219 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
220 
221 /* Print the test outcome */
222 #define report checkasm_report
223 
224 /* Call the reference function */
225 #define call_ref(...)\
226  checkasm_call((func_type *)func_ref, __VA_ARGS__)
227 
228 #define checkasm_call(func, ...) \
229  (checkasm_set_signal_handler_state(1),\
230  (func)(__VA_ARGS__));\
231  checkasm_set_signal_handler_state(0)
232 
233 #define call_new(...) checkasm_call_checked(((func_type *)func_new), __VA_ARGS__)
234 
235 #if ARCH_X86 && HAVE_X86ASM
236 /* Verifies that clobbered callee-saved registers are properly saved and restored
237  * and that either no MMX registers are touched or emms is issued */
238 void checkasm_checked_call(void *func, ...);
239 /* Verifies that clobbered callee-saved registers are properly saved and restored
240  * and issues emms for asm functions which are not required to do so */
241 void checkasm_checked_call_emms(void *func, ...);
242 /* Verifies that clobbered callee-saved registers are properly saved and restored
243  * but doesn't issue emms. Meant for dsp functions returning float or double */
244 void checkasm_checked_call_float(void *func, ...);
245 
246 #if ARCH_X86_64
247 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
248  * This is done by clobbering the stack with junk around the stack pointer and calling the
249  * assembly function through checked_call() with added dummy arguments which forces all
250  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
251  * upper half of the 64-bit register locations on the stack will now contain junk which will
252  * cause misbehaving functions to either produce incorrect output or segfault. Note that
253  * even though this works extremely well in practice, it's technically not guaranteed
254  * and false negatives is theoretically possible, but there can never be any false positives.
255  */
256 void checkasm_stack_clobber(uint64_t clobber, ...);
257 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
258  = (void *)checkasm_checked_call;
259 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
260  = (void *)checkasm_checked_call_float;
261 #define declare_new_emms(cpu_flags, ret, ...) \
262  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
263  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
264  (void *)checkasm_checked_call;
265 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
266 #define checkasm_call_checked(func, ...) \
267  (checkasm_set_signal_handler_state(1),\
268  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
269  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
270  checked_call((func), 0, 0, 0, 0, 0, __VA_ARGS__));\
271  checkasm_set_signal_handler_state(0)
272 #elif ARCH_X86_32
273 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
274 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
275 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
276  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
277  (void *)checkasm_checked_call;
278 #define checkasm_call_checked(func, ...)\
279  (checkasm_set_signal_handler_state(1),\
280  checked_call((func), __VA_ARGS__));\
281  checkasm_set_signal_handler_state(0)
282 #endif
283 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
284 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
285  * This makes sure that potential 8-byte-alignment of parameters is kept the same
286  * even when the extra parameters have been removed. */
287 void checkasm_checked_call_vfp(void *func, int dummy, ...);
288 void checkasm_checked_call_novfp(void *func, int dummy, ...);
289 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
290 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
291  int, int, int, int, int, int, int, int, \
292  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
293 #define checkasm_call_checked(func, ...) \
294  (checkasm_set_signal_handler_state(1),\
295  checked_call((func), 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
296  checkasm_set_signal_handler_state(0)
297 #elif ARCH_AARCH64 && !defined(__APPLE__)
298 void checkasm_stack_clobber(uint64_t clobber, ...);
299 void checkasm_checked_call(void *func, ...);
300 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
301  int, int, int, int, int, int, int, int,\
302  int, int, int, int, int, int, int)\
303  = (void *)checkasm_checked_call;
304 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
305 #define checkasm_call_checked(func, ...) (checkasm_set_signal_handler_state(1),\
306  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
307  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
308  checked_call((func), 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
309  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
310  checkasm_set_signal_handler_state(0)
311 #elif ARCH_RISCV
312 void checkasm_set_function(void *);
313 void *checkasm_get_wrapper(void);
314 
315 #if HAVE_RV
316 #define declare_new(ret, ...) \
317  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
318 #define checkasm_call_checked(func, ...) \
319  (checkasm_set_signal_handler_state(1),\
320  checkasm_set_function(func), checked_call(__VA_ARGS__));\
321  checkasm_set_signal_handler_state(0)
322 #else
323 #define declare_new(ret, ...)
324 #define checkasm_call_checked(func, ...)\
325  (checkasm_set_signal_handler_state(1),\
326  (func)(__VA_ARGS__));\
327  checkasm_set_signal_handler_state(0)
328 #endif
329 #else
330 #define declare_new(ret, ...)
331 #define declare_new_float(ret, ...)
332 #define declare_new_emms(cpu_flags, ret, ...)
333 /* Call the function */
334 #define checkasm_call_checked(func, ...)\
335  (checkasm_set_signal_handler_state(1),\
336  (func)(__VA_ARGS__));\
337  checkasm_set_signal_handler_state(0)
338 #endif
339 
340 #ifndef declare_new_emms
341 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
342 #endif
343 #ifndef declare_new_float
344 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
345 #endif
346 
347 typedef struct CheckasmPerf {
348  int sysfd;
349  uint64_t cycles;
350  int iterations;
351 } CheckasmPerf;
352 
353 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
354 
355 #if CONFIG_LINUX_PERF
356 #define PERF_START(t) do { \
357  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
358  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
359 } while (0)
360 #define PERF_STOP(t) do { \
361  int ret; \
362  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
363  ret = read(sysfd, &t, sizeof(t)); \
364  (void)ret; \
365 } while (0)
366 #elif CONFIG_MACOS_KPERF
367 #define PERF_START(t) t = ff_kperf_cycles()
368 #define PERF_STOP(t) t = ff_kperf_cycles() - t
369 #else
370 #define PERF_START(t) t = AV_READ_TIME()
371 #define PERF_STOP(t) t = AV_READ_TIME() - t
372 #endif
373 
374 #define CALL4(...)\
375  do {\
376  tfunc(__VA_ARGS__); \
377  tfunc(__VA_ARGS__); \
378  tfunc(__VA_ARGS__); \
379  tfunc(__VA_ARGS__); \
380  } while (0)
381 
382 #define CALL16(...)\
383  do {\
384  CALL4(__VA_ARGS__); \
385  CALL4(__VA_ARGS__); \
386  CALL4(__VA_ARGS__); \
387  CALL4(__VA_ARGS__); \
388  } while (0)
389 
390 /* Benchmark the function */
391 #define bench(func, ...)\
392  do {\
393  if (checkasm_bench_func()) {\
394  struct CheckasmPerf *perf = checkasm_get_perf_context();\
395  av_unused const int sysfd = perf->sysfd;\
396  func_type *tfunc = func;\
397  uint64_t tsum = 0;\
398  uint64_t ti, tcount = 0;\
399  uint64_t t = 0; \
400  const uint64_t truns = FFMAX(bench_runs >> 3, 1);\
401  checkasm_set_signal_handler_state(1);\
402  for (ti = 0; ti < truns; ti++) {\
403  PERF_START(t);\
404  CALL16(__VA_ARGS__);\
405  CALL16(__VA_ARGS__);\
406  PERF_STOP(t);\
407  if (t*tcount <= tsum*4 && ti > 0) {\
408  tsum += t;\
409  tcount++;\
410  }\
411  }\
412  emms_c();\
413  perf->cycles += tsum;\
414  perf->iterations += tcount;\
415  checkasm_set_signal_handler_state(0);\
416  }\
417  } while (0)
418 #else
419 #define bench(func, ...) while(0)
420 #define PERF_START(t) while(0)
421 #define PERF_STOP(t) while(0)
422 #endif
423 
424 #define bench_new(...) bench(func_new, __VA_ARGS__)
425 
426 #define BUF_RECT(type, name, w, h) \
427  LOCAL_ALIGNED_32(type, name##_buf, [((h)+32)*(FFALIGN(w,64)+64) + 64]); \
428  av_unused ptrdiff_t name##_stride = sizeof(type)*(FFALIGN(w,64)+64); \
429  av_unused int name##_buf_h = (h)+32; \
430  type *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
431 
432 #define PIXEL_RECT(name, w, h) \
433  LOCAL_ALIGNED_32(uint8_t, name##_buf, [sizeof(uint16_t) * (((h)+32)*(FFALIGN(w,64)+64) + 64)],); \
434  av_unused ptrdiff_t name##_stride = sizeof(uint16_t) * (FFALIGN(w,64)+64); \
435  av_unused int name##_buf_h = (h)+32; \
436  uint8_t *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
437 
438 #define CLEAR_BUF_RECT(name) \
439  memset(name##_buf, 0x99, name##_stride * name##_buf_h + 64)
440 #define CLEAR_PIXEL_RECT(name) \
441  CLEAR_BUF_RECT(name)
442 
443 #define DECL_CHECKASM_CHECK_FUNC(type) \
444 int checkasm_check_##type(const char *file, int line, \
445  const type *buf1, ptrdiff_t stride1, \
446  const type *buf2, ptrdiff_t stride2, \
447  int w, int h, const char *name, \
448  int align_w, int align_h, \
449  int padding)
450 
451 DECL_CHECKASM_CHECK_FUNC(uint8_t);
452 DECL_CHECKASM_CHECK_FUNC(uint16_t);
453 DECL_CHECKASM_CHECK_FUNC(uint32_t);
454 DECL_CHECKASM_CHECK_FUNC(int16_t);
455 DECL_CHECKASM_CHECK_FUNC(int32_t);
456 
457 int checkasm_check_float_ulp(const char *file, int line,
458  const float *buf1, ptrdiff_t stride1,
459  const float *buf2, ptrdiff_t stride2,
460  int w, int h, const char *name,
461  unsigned max_ulp, int align_w, int align_h,
462  int padding);
463 
464 #define PASTE(a,b) a ## b
465 #define CONCAT(a,b) PASTE(a,b)
466 
467 #define checkasm_check2(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
468 #define checkasm_check(prefix, ...) checkasm_check2(prefix, __VA_ARGS__, 0, 0, 0)
469 /* Check a pointer from BUF_RECT, checking whether there have been
470  * writes outside of the designated area. */
471 #define checkasm_check_padded(...) \
472  checkasm_check2(__VA_ARGS__, 1, 1, 8)
473 /* Check a pointer from BUF_RECT, checking whether there have been
474  * writes outside of the designated area. Allow writing slightly past the
475  * end of the buffer, by aligning w/h to align_w/align_h, and checking
476  * for overwrites outside of that. */
477 #define checkasm_check_padded_align(...) \
478  checkasm_check2(__VA_ARGS__, 8)
479 
480 /* This assumes that there is a local variable named "bit_depth".
481  * For tests that don't have that and only operate on a single
482  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
483 #define checkasm_check_pixel2(buf1, stride1, buf2, stride2, ...) \
484  ((bit_depth > 8) ? \
485  checkasm_check2(uint16_t, (const uint16_t*)buf1, stride1, \
486  (const uint16_t*)buf2, stride2, \
487  __VA_ARGS__) : \
488  checkasm_check2(uint8_t, (const uint8_t*) buf1, stride1, \
489  (const uint8_t*) buf2, stride2, \
490  __VA_ARGS__))
491 #define checkasm_check_pixel(...) \
492  checkasm_check_pixel2(__VA_ARGS__, 0, 0, 0)
493 #define checkasm_check_pixel_padded(...) \
494  checkasm_check_pixel2(__VA_ARGS__, 1, 1, 8)
495 #define checkasm_check_pixel_padded_align(...) \
496  checkasm_check_pixel2(__VA_ARGS__, 8)
497 
498 /* This assumes that there is a local variable named "bit_depth"
499  * and that the type-specific buffers obey the name ## _BITDEPTH
500  * convention.
501  * For tests that don't have that and only operate on a single
502  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
503 #define checkasm_check_dctcoef(buf1, stride1, buf2, stride2, ...) \
504  ((bit_depth > 8) ? \
505  checkasm_check(int32_t, buf1 ## _32, stride1, \
506  buf2 ## _32, stride2, \
507  __VA_ARGS__) : \
508  checkasm_check(int16_t, buf1 ## _16, stride1, \
509  buf2 ## _16, stride2, \
510  __VA_ARGS__))
511 
512 #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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void checkasm_check_videodsp(void)
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CheckasmPerf
Definition: checkasm.h:347
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s
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void checkasm_check_vf_bwdif(void)
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checkasm_check_sw_rgb
void checkasm_check_sw_rgb(void)
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checkasm_check_hevc_sao
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CheckasmPerf::iterations
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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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