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_idct(void);
114 void checkasm_check_hevc_pel(void);
115 void checkasm_check_hevc_sao(void);
116 void checkasm_check_hpeldsp(void);
117 void checkasm_check_huffyuvdsp(void);
118 void checkasm_check_idctdsp(void);
119 void checkasm_check_idet(void);
120 void checkasm_check_jpeg2000dsp(void);
121 void checkasm_check_llauddsp(void);
122 void checkasm_check_lls(void);
123 void checkasm_check_llviddsp(void);
124 void checkasm_check_llvidencdsp(void);
125 void checkasm_check_lpc(void);
126 void checkasm_check_motion(void);
127 void checkasm_check_mpegvideo_unquantize(void);
128 void checkasm_check_mpegvideoencdsp(void);
129 void checkasm_check_nlmeans(void);
130 void checkasm_check_opusdsp(void);
131 void checkasm_check_pixblockdsp(void);
132 void checkasm_check_qpeldsp(void);
133 void checkasm_check_sbrdsp(void);
134 void checkasm_check_rv34dsp(void);
135 void checkasm_check_rv40dsp(void);
136 void checkasm_check_scene_sad(void);
137 void checkasm_check_svq1enc(void);
138 void checkasm_check_synth_filter(void);
139 void checkasm_check_sw_gbrp(void);
140 void checkasm_check_sw_range_convert(void);
141 void checkasm_check_sw_rgb(void);
142 void checkasm_check_sw_scale(void);
143 void checkasm_check_sw_xyz2rgb(void);
144 void checkasm_check_sw_yuv2rgb(void);
145 void checkasm_check_sw_yuv2yuv(void);
146 void checkasm_check_sw_ops(void);
147 void checkasm_check_takdsp(void);
148 void checkasm_check_utvideodsp(void);
149 void checkasm_check_v210dec(void);
150 void checkasm_check_v210enc(void);
151 void checkasm_check_vc1dsp(void);
152 void checkasm_check_vf_bwdif(void);
153 void checkasm_check_vf_eq(void);
154 void checkasm_check_vf_fspp(void);
155 void checkasm_check_vf_gblur(void);
156 void checkasm_check_vf_hflip(void);
157 void checkasm_check_vf_threshold(void);
158 void checkasm_check_vf_sobel(void);
159 void checkasm_check_vp3dsp(void);
160 void checkasm_check_vp6dsp(void);
161 void checkasm_check_vp8dsp(void);
162 void checkasm_check_vp9dsp(void);
163 void checkasm_check_vp9_ipred(void);
164 void checkasm_check_vp9_itxfm(void);
165 void checkasm_check_vp9_loopfilter(void);
166 void checkasm_check_vp9_mc(void);
167 void checkasm_check_videodsp(void);
168 void checkasm_check_vorbisdsp(void);
169 void checkasm_check_vvc_alf(void);
170 void checkasm_check_vvc_mc(void);
171 void checkasm_check_vvc_sao(void);
172 
173 struct CheckasmPerf;
174 
175 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
176 int checkasm_bench_func(void);
177 int checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
178 struct CheckasmPerf *checkasm_get_perf_context(void);
179 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
180 void checkasm_set_signal_handler_state(int enabled);
181 int checkasm_handle_signal(int s);
182 extern checkasm_context checkasm_context_buf;
183 
184 /* float compare utilities */
185 int float_near_ulp(float a, float b, unsigned max_ulp);
186 int float_near_abs_eps(float a, float b, float eps);
187 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
188 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
189  unsigned len);
190 int float_near_abs_eps_array(const float *a, const float *b, float eps,
191  unsigned len);
192 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
193  unsigned max_ulp, unsigned len);
194 int double_near_abs_eps(double a, double b, double eps);
195 int double_near_abs_eps_array(const double *a, const double *b, double eps,
196  unsigned len);
197 
198 extern AVLFG checkasm_lfg;
199 #define rnd() av_lfg_get(&checkasm_lfg)
200 
201 av_unused static void *func_ref, *func_new;
202 
203 extern uint64_t bench_runs;
204 
205 /* Decide whether or not the specified function needs to be tested */
206 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
207 #define check_key(key, ...) (checkasm_save_context(), checkasm_check_func(key, __VA_ARGS__))
208 
209 /* Declare the function prototype. The first argument is the return value, the remaining
210  * arguments are the function parameters. Naming parameters is optional. */
211 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
212 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
213 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
214 
215 /* Indicate that the current test has failed */
216 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
217 
218 /* Print the test outcome */
219 #define report checkasm_report
220 
221 /* Call the reference function */
222 #define call_ref(...)\
223  checkasm_call((func_type *)func_ref, __VA_ARGS__)
224 
225 #define checkasm_call(func, ...) \
226  (checkasm_set_signal_handler_state(1),\
227  (func)(__VA_ARGS__));\
228  checkasm_set_signal_handler_state(0)
229 
230 #define call_new(...) checkasm_call_checked(((func_type *)func_new), __VA_ARGS__)
231 
232 #if ARCH_X86 && HAVE_X86ASM
233 /* Verifies that clobbered callee-saved registers are properly saved and restored
234  * and that either no MMX registers are touched or emms is issued */
235 void checkasm_checked_call(void *func, ...);
236 /* Verifies that clobbered callee-saved registers are properly saved and restored
237  * and issues emms for asm functions which are not required to do so */
238 void checkasm_checked_call_emms(void *func, ...);
239 /* Verifies that clobbered callee-saved registers are properly saved and restored
240  * but doesn't issue emms. Meant for dsp functions returning float or double */
241 void checkasm_checked_call_float(void *func, ...);
242 
243 #if ARCH_X86_64
244 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
245  * This is done by clobbering the stack with junk around the stack pointer and calling the
246  * assembly function through checked_call() with added dummy arguments which forces all
247  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
248  * upper half of the 64-bit register locations on the stack will now contain junk which will
249  * cause misbehaving functions to either produce incorrect output or segfault. Note that
250  * even though this works extremely well in practice, it's technically not guaranteed
251  * and false negatives is theoretically possible, but there can never be any false positives.
252  */
253 void checkasm_stack_clobber(uint64_t clobber, ...);
254 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
255  = (void *)checkasm_checked_call;
256 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
257  = (void *)checkasm_checked_call_float;
258 #define declare_new_emms(cpu_flags, ret, ...) \
259  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
260  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
261  (void *)checkasm_checked_call;
262 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
263 #define checkasm_call_checked(func, ...) \
264  (checkasm_set_signal_handler_state(1),\
265  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
266  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
267  checked_call((func), 0, 0, 0, 0, 0, __VA_ARGS__));\
268  checkasm_set_signal_handler_state(0)
269 #elif ARCH_X86_32
270 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
271 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
272 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
273  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
274  (void *)checkasm_checked_call;
275 #define checkasm_call_checked(func, ...)\
276  (checkasm_set_signal_handler_state(1),\
277  checked_call((func), __VA_ARGS__));\
278  checkasm_set_signal_handler_state(0)
279 #endif
280 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
281 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
282  * This makes sure that potential 8-byte-alignment of parameters is kept the same
283  * even when the extra parameters have been removed. */
284 void checkasm_checked_call_vfp(void *func, int dummy, ...);
285 void checkasm_checked_call_novfp(void *func, int dummy, ...);
286 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
287 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
288  int, int, int, int, int, int, int, int, \
289  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
290 #define checkasm_call_checked(func, ...) \
291  (checkasm_set_signal_handler_state(1),\
292  checked_call((func), 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
293  checkasm_set_signal_handler_state(0)
294 #elif ARCH_AARCH64 && !defined(__APPLE__)
295 void checkasm_stack_clobber(uint64_t clobber, ...);
296 void checkasm_checked_call(void *func, ...);
297 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
298  int, int, int, int, int, int, int, int,\
299  int, int, int, int, int, int, int)\
300  = (void *)checkasm_checked_call;
301 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
302 #define checkasm_call_checked(func, ...) (checkasm_set_signal_handler_state(1),\
303  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
304  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
305  checked_call((func), 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
306  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
307  checkasm_set_signal_handler_state(0)
308 #elif ARCH_RISCV
309 void checkasm_set_function(void *);
310 void *checkasm_get_wrapper(void);
311 
312 #if HAVE_RV && (__riscv_xlen == 64) && defined (__riscv_d)
313 #define declare_new(ret, ...) \
314  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
315 #define checkasm_call_checked(func, ...) \
316  (checkasm_set_signal_handler_state(1),\
317  checkasm_set_function(func), checked_call(__VA_ARGS__));\
318  checkasm_set_signal_handler_state(0)
319 #else
320 #define declare_new(ret, ...)
321 #define checkasm_call_checked(func, ...)\
322  (checkasm_set_signal_handler_state(1),\
323  (func)(__VA_ARGS__));\
324  checkasm_set_signal_handler_state(0)
325 #endif
326 #else
327 #define declare_new(ret, ...)
328 #define declare_new_float(ret, ...)
329 #define declare_new_emms(cpu_flags, ret, ...)
330 /* Call the function */
331 #define checkasm_call_checked(func, ...)\
332  (checkasm_set_signal_handler_state(1),\
333  (func)(__VA_ARGS__));\
334  checkasm_set_signal_handler_state(0)
335 #endif
336 
337 #ifndef declare_new_emms
338 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
339 #endif
340 #ifndef declare_new_float
341 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
342 #endif
343 
344 typedef struct CheckasmPerf {
345  int sysfd;
346  uint64_t cycles;
347  int iterations;
348 } CheckasmPerf;
349 
350 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
351 
352 #if CONFIG_LINUX_PERF
353 #define PERF_START(t) do { \
354  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
355  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
356 } while (0)
357 #define PERF_STOP(t) do { \
358  int ret; \
359  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
360  ret = read(sysfd, &t, sizeof(t)); \
361  (void)ret; \
362 } while (0)
363 #elif CONFIG_MACOS_KPERF
364 #define PERF_START(t) t = ff_kperf_cycles()
365 #define PERF_STOP(t) t = ff_kperf_cycles() - t
366 #else
367 #define PERF_START(t) t = AV_READ_TIME()
368 #define PERF_STOP(t) t = AV_READ_TIME() - t
369 #endif
370 
371 #define CALL4(...)\
372  do {\
373  tfunc(__VA_ARGS__); \
374  tfunc(__VA_ARGS__); \
375  tfunc(__VA_ARGS__); \
376  tfunc(__VA_ARGS__); \
377  } while (0)
378 
379 #define CALL16(...)\
380  do {\
381  CALL4(__VA_ARGS__); \
382  CALL4(__VA_ARGS__); \
383  CALL4(__VA_ARGS__); \
384  CALL4(__VA_ARGS__); \
385  } while (0)
386 
387 /* Benchmark the function */
388 #define bench(func, ...)\
389  do {\
390  if (checkasm_bench_func()) {\
391  struct CheckasmPerf *perf = checkasm_get_perf_context();\
392  av_unused const int sysfd = perf->sysfd;\
393  func_type *tfunc = func;\
394  uint64_t tsum = 0;\
395  uint64_t ti, tcount = 0;\
396  uint64_t t = 0; \
397  const uint64_t truns = FFMAX(bench_runs >> 3, 1);\
398  checkasm_set_signal_handler_state(1);\
399  for (ti = 0; ti < truns; ti++) {\
400  PERF_START(t);\
401  CALL16(__VA_ARGS__);\
402  CALL16(__VA_ARGS__);\
403  PERF_STOP(t);\
404  if (t*tcount <= tsum*4 && ti > 0) {\
405  tsum += t;\
406  tcount++;\
407  }\
408  }\
409  emms_c();\
410  perf->cycles += tsum;\
411  perf->iterations += tcount;\
412  checkasm_set_signal_handler_state(0);\
413  }\
414  } while (0)
415 #else
416 #define bench(func, ...) while(0)
417 #define PERF_START(t) while(0)
418 #define PERF_STOP(t) while(0)
419 #endif
420 
421 #define bench_new(...) bench(func_new, __VA_ARGS__)
422 
423 #define BUF_RECT(type, name, w, h) \
424  LOCAL_ALIGNED_32(type, name##_buf, [((h)+32)*(FFALIGN(w,64)+64) + 64]); \
425  av_unused ptrdiff_t name##_stride = sizeof(type)*(FFALIGN(w,64)+64); \
426  av_unused int name##_buf_h = (h)+32; \
427  type *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
428 
429 #define PIXEL_RECT(name, w, h) \
430  LOCAL_ALIGNED_32(uint8_t, name##_buf, [sizeof(uint16_t) * (((h)+32)*(FFALIGN(w,64)+64) + 64)],); \
431  av_unused ptrdiff_t name##_stride = sizeof(uint16_t) * (FFALIGN(w,64)+64); \
432  av_unused int name##_buf_h = (h)+32; \
433  uint8_t *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
434 
435 #define CLEAR_BUF_RECT(name) \
436  memset(name##_buf, 0x99, name##_stride * name##_buf_h + 64)
437 #define CLEAR_PIXEL_RECT(name) \
438  CLEAR_BUF_RECT(name)
439 
440 #define DECL_CHECKASM_CHECK_FUNC(type) \
441 int checkasm_check_##type(const char *file, int line, \
442  const type *buf1, ptrdiff_t stride1, \
443  const type *buf2, ptrdiff_t stride2, \
444  int w, int h, const char *name, \
445  int align_w, int align_h, \
446  int padding)
447 
448 DECL_CHECKASM_CHECK_FUNC(uint8_t);
449 DECL_CHECKASM_CHECK_FUNC(uint16_t);
450 DECL_CHECKASM_CHECK_FUNC(uint32_t);
451 DECL_CHECKASM_CHECK_FUNC(int16_t);
452 DECL_CHECKASM_CHECK_FUNC(int32_t);
453 
454 int checkasm_check_float_ulp(const char *file, int line,
455  const float *buf1, ptrdiff_t stride1,
456  const float *buf2, ptrdiff_t stride2,
457  int w, int h, const char *name,
458  unsigned max_ulp, int align_w, int align_h,
459  int padding);
460 
461 #define PASTE(a,b) a ## b
462 #define CONCAT(a,b) PASTE(a,b)
463 
464 #define checkasm_check2(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
465 #define checkasm_check(prefix, ...) checkasm_check2(prefix, __VA_ARGS__, 0, 0, 0)
466 /* Check a pointer from BUF_RECT, checking whether there have been
467  * writes outside of the designated area. */
468 #define checkasm_check_padded(...) \
469  checkasm_check2(__VA_ARGS__, 1, 1, 8)
470 /* Check a pointer from BUF_RECT, checking whether there have been
471  * writes outside of the designated area. Allow writing slightly past the
472  * end of the buffer, by aligning w/h to align_w/align_h, and checking
473  * for overwrites outside of that. */
474 #define checkasm_check_padded_align(...) \
475  checkasm_check2(__VA_ARGS__, 8)
476 
477 /* This assumes that there is a local variable named "bit_depth".
478  * For tests that don't have that and only operate on a single
479  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
480 #define checkasm_check_pixel2(buf1, stride1, buf2, stride2, ...) \
481  ((bit_depth > 8) ? \
482  checkasm_check2(uint16_t, (const uint16_t*)buf1, stride1, \
483  (const uint16_t*)buf2, stride2, \
484  __VA_ARGS__) : \
485  checkasm_check2(uint8_t, (const uint8_t*) buf1, stride1, \
486  (const uint8_t*) buf2, stride2, \
487  __VA_ARGS__))
488 #define checkasm_check_pixel(...) \
489  checkasm_check_pixel2(__VA_ARGS__, 0, 0, 0)
490 #define checkasm_check_pixel_padded(...) \
491  checkasm_check_pixel2(__VA_ARGS__, 1, 1, 8)
492 #define checkasm_check_pixel_padded_align(...) \
493  checkasm_check_pixel2(__VA_ARGS__, 8)
494 
495 /* This assumes that there is a local variable named "bit_depth"
496  * and that the type-specific buffers obey the name ## _BITDEPTH
497  * convention.
498  * For tests that don't have that and only operate on a single
499  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
500 #define checkasm_check_dctcoef(buf1, stride1, buf2, stride2, ...) \
501  ((bit_depth > 8) ? \
502  checkasm_check(int32_t, buf1 ## _32, stride1, \
503  buf2 ## _32, stride2, \
504  __VA_ARGS__) : \
505  checkasm_check(int16_t, buf1 ## _16, stride1, \
506  buf2 ## _16, stride2, \
507  __VA_ARGS__))
508 
509 #endif /* TESTS_CHECKASM_CHECKASM_H */
checkasm_check_nlmeans
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Definition: vf_nlmeans.c:32
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name
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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Definition: fdctdsp.c:67
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checkasm_check_alacdsp
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CheckasmPerf
Definition: checkasm.h:344
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s
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void checkasm_check_sw_rgb(void)
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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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