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