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_pred(void);
117 void checkasm_check_hevc_sao(void);
118 void checkasm_check_hpeldsp(void);
119 void checkasm_check_huffyuvdsp(void);
120 void checkasm_check_huffyuvencdsp(void);
121 void checkasm_check_idctdsp(void);
122 void checkasm_check_idet(void);
123 void checkasm_check_jpeg2000dsp(void);
124 void checkasm_check_llauddsp(void);
125 void checkasm_check_lls(void);
126 void checkasm_check_llviddsp(void);
127 void checkasm_check_llvidencdsp(void);
128 void checkasm_check_lpc(void);
129 void checkasm_check_motion(void);
130 void checkasm_check_mpeg4videodsp(void);
131 void checkasm_check_mpegvideo_unquantize(void);
132 void checkasm_check_mpegvideoencdsp(void);
133 void checkasm_check_nlmeans(void);
134 void checkasm_check_opusdsp(void);
135 void checkasm_check_pixblockdsp(void);
136 void checkasm_check_pixelutils(void);
137 void checkasm_check_png(void);
138 void checkasm_check_qpeldsp(void);
139 void checkasm_check_sbcdsp(void);
140 void checkasm_check_sbrdsp(void);
141 void checkasm_check_rv34dsp(void);
142 void checkasm_check_rv40dsp(void);
143 void checkasm_check_scene_sad(void);
144 void checkasm_check_snowdsp(void);
145 void checkasm_check_svq1enc(void);
146 void checkasm_check_synth_filter(void);
147 void checkasm_check_sw_gbrp(void);
148 void checkasm_check_sw_range_convert(void);
149 void checkasm_check_sw_rgb(void);
150 void checkasm_check_sw_scale(void);
151 void checkasm_check_sw_xyz2rgb(void);
152 void checkasm_check_sw_yuv2rgb(void);
153 void checkasm_check_sw_yuv2yuv(void);
154 void checkasm_check_sw_ops(void);
155 void checkasm_check_takdsp(void);
156 void checkasm_check_utvideodsp(void);
157 void checkasm_check_v210dec(void);
158 void checkasm_check_v210enc(void);
159 void checkasm_check_vc1dsp(void);
160 void checkasm_check_vf_bwdif(void);
161 void checkasm_check_vf_eq(void);
162 void checkasm_check_vf_fspp(void);
163 void checkasm_check_vf_gblur(void);
164 void checkasm_check_vf_hflip(void);
165 void checkasm_check_vf_pp7(void);
166 void checkasm_check_vf_threshold(void);
167 void checkasm_check_vf_sobel(void);
168 void checkasm_check_vp3dsp(void);
169 void checkasm_check_vp6dsp(void);
170 void checkasm_check_vp8dsp(void);
171 void checkasm_check_vp9dsp(void);
172 void checkasm_check_vp9_ipred(void);
173 void checkasm_check_vp9_itxfm(void);
174 void checkasm_check_vp9_loopfilter(void);
175 void checkasm_check_vp9_mc(void);
176 void checkasm_check_videodsp(void);
177 void checkasm_check_vorbisdsp(void);
178 void checkasm_check_vvc_alf(void);
179 void checkasm_check_vvc_mc(void);
180 void checkasm_check_vvc_sao(void);
181 
182 struct CheckasmPerf;
183 
184 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
185 int checkasm_bench_func(void);
186 int checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
187 struct CheckasmPerf *checkasm_get_perf_context(void);
188 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
189 void checkasm_set_signal_handler_state(int enabled);
190 int checkasm_handle_signal(int s);
191 extern checkasm_context checkasm_context_buf;
192 
193 /* float compare utilities */
194 int float_near_ulp(float a, float b, unsigned max_ulp);
195 int float_near_abs_eps(float a, float b, float eps);
196 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
197 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
198  unsigned len);
199 int float_near_abs_eps_array(const float *a, const float *b, float eps,
200  unsigned len);
201 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
202  unsigned max_ulp, unsigned len);
203 int double_near_abs_eps(double a, double b, double eps);
204 int double_near_abs_eps_array(const double *a, const double *b, double eps,
205  unsigned len);
206 
207 extern AVLFG checkasm_lfg;
208 #define rnd() av_lfg_get(&checkasm_lfg)
209 
210 av_unused static void *func_ref, *func_new;
211 
212 extern uint64_t bench_runs;
213 
214 /* Decide whether or not the specified function needs to be tested */
215 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
216 #define check_key(key, ...) (checkasm_save_context(), checkasm_check_func(key, __VA_ARGS__))
217 
218 /* Declare the function prototype. The first argument is the return value, the remaining
219  * arguments are the function parameters. Naming parameters is optional. */
220 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
221 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
222 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
223 
224 /* Indicate that the current test has failed */
225 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
226 
227 /* Print the test outcome */
228 #define report checkasm_report
229 
230 /* Call the reference function */
231 #define call_ref(...)\
232  checkasm_call((func_type *)func_ref, __VA_ARGS__)
233 
234 #define checkasm_call(func, ...) \
235  (checkasm_set_signal_handler_state(1),\
236  (func)(__VA_ARGS__));\
237  checkasm_set_signal_handler_state(0)
238 
239 #define call_new(...) checkasm_call_checked(((func_type *)func_new), __VA_ARGS__)
240 
241 #if ARCH_X86 && HAVE_X86ASM
242 /* Verifies that clobbered callee-saved registers are properly saved and restored
243  * and that either no MMX registers are touched or emms is issued */
244 void checkasm_checked_call(void *func, ...);
245 /* Verifies that clobbered callee-saved registers are properly saved and restored
246  * and issues emms for asm functions which are not required to do so */
247 void checkasm_checked_call_emms(void *func, ...);
248 /* Verifies that clobbered callee-saved registers are properly saved and restored
249  * but doesn't issue emms. Meant for dsp functions returning float or double */
250 void checkasm_checked_call_float(void *func, ...);
251 
252 #if ARCH_X86_64
253 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
254  * This is done by clobbering the stack with junk around the stack pointer and calling the
255  * assembly function through checked_call() with added dummy arguments which forces all
256  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
257  * upper half of the 64-bit register locations on the stack will now contain junk which will
258  * cause misbehaving functions to either produce incorrect output or segfault. Note that
259  * even though this works extremely well in practice, it's technically not guaranteed
260  * and false negatives is theoretically possible, but there can never be any false positives.
261  */
262 void checkasm_stack_clobber(uint64_t clobber, ...);
263 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
264  = (void *)checkasm_checked_call;
265 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
266  = (void *)checkasm_checked_call_float;
267 #define declare_new_emms(cpu_flags, ret, ...) \
268  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
269  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
270  (void *)checkasm_checked_call;
271 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
272 #define checkasm_call_checked(func, ...) \
273  (checkasm_set_signal_handler_state(1),\
274  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
275  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
276  checked_call((func), 0, 0, 0, 0, 0, __VA_ARGS__));\
277  checkasm_set_signal_handler_state(0)
278 #elif ARCH_X86_32
279 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
280 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
281 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
282  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
283  (void *)checkasm_checked_call;
284 #define checkasm_call_checked(func, ...)\
285  (checkasm_set_signal_handler_state(1),\
286  checked_call((func), __VA_ARGS__));\
287  checkasm_set_signal_handler_state(0)
288 #endif
289 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
290 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
291  * This makes sure that potential 8-byte-alignment of parameters is kept the same
292  * even when the extra parameters have been removed. */
293 void checkasm_checked_call_vfp(void *func, int dummy, ...);
294 void checkasm_checked_call_novfp(void *func, int dummy, ...);
295 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
296 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
297  int, int, int, int, int, int, int, int, \
298  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
299 #define checkasm_call_checked(func, ...) \
300  (checkasm_set_signal_handler_state(1),\
301  checked_call((func), 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
302  checkasm_set_signal_handler_state(0)
303 #elif ARCH_AARCH64 && !defined(__APPLE__)
304 void checkasm_stack_clobber(uint64_t clobber, ...);
305 void checkasm_checked_call(void *func, ...);
306 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
307  int, int, int, int, int, int, int, int,\
308  int, int, int, int, int, int, int)\
309  = (void *)checkasm_checked_call;
310 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
311 #define checkasm_call_checked(func, ...) (checkasm_set_signal_handler_state(1),\
312  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
313  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
314  checked_call((func), 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
315  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
316  checkasm_set_signal_handler_state(0)
317 #elif ARCH_RISCV
318 void checkasm_set_function(void *);
319 void *checkasm_get_wrapper(void);
320 
321 #if HAVE_RV
322 #define declare_new(ret, ...) \
323  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
324 #define checkasm_call_checked(func, ...) \
325  (checkasm_set_signal_handler_state(1),\
326  checkasm_set_function(func), checked_call(__VA_ARGS__));\
327  checkasm_set_signal_handler_state(0)
328 #else
329 #define declare_new(ret, ...)
330 #define checkasm_call_checked(func, ...)\
331  (checkasm_set_signal_handler_state(1),\
332  (func)(__VA_ARGS__));\
333  checkasm_set_signal_handler_state(0)
334 #endif
335 #else
336 #define declare_new(ret, ...)
337 #define declare_new_float(ret, ...)
338 #define declare_new_emms(cpu_flags, ret, ...)
339 /* Call the function */
340 #define checkasm_call_checked(func, ...)\
341  (checkasm_set_signal_handler_state(1),\
342  (func)(__VA_ARGS__));\
343  checkasm_set_signal_handler_state(0)
344 #endif
345 
346 #ifndef declare_new_emms
347 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
348 #endif
349 #ifndef declare_new_float
350 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
351 #endif
352 
353 typedef struct CheckasmPerf {
354  int sysfd;
355  uint64_t cycles;
356  int iterations;
357 } CheckasmPerf;
358 
359 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
360 
361 #if CONFIG_LINUX_PERF
362 #define PERF_START(t) do { \
363  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
364  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
365 } while (0)
366 #define PERF_STOP(t) do { \
367  int ret; \
368  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
369  ret = read(sysfd, &t, sizeof(t)); \
370  (void)ret; \
371 } while (0)
372 #elif CONFIG_MACOS_KPERF
373 #define PERF_START(t) t = ff_kperf_cycles()
374 #define PERF_STOP(t) t = ff_kperf_cycles() - t
375 #else
376 #define PERF_START(t) t = AV_READ_TIME()
377 #define PERF_STOP(t) t = AV_READ_TIME() - t
378 #endif
379 
380 #define CALL4(...)\
381  do {\
382  tfunc(__VA_ARGS__); \
383  tfunc(__VA_ARGS__); \
384  tfunc(__VA_ARGS__); \
385  tfunc(__VA_ARGS__); \
386  } while (0)
387 
388 #define CALL16(...)\
389  do {\
390  CALL4(__VA_ARGS__); \
391  CALL4(__VA_ARGS__); \
392  CALL4(__VA_ARGS__); \
393  CALL4(__VA_ARGS__); \
394  } while (0)
395 
396 /* Benchmark the function */
397 #define bench(func, ...)\
398  do {\
399  if (checkasm_bench_func()) {\
400  struct CheckasmPerf *perf = checkasm_get_perf_context();\
401  av_unused const int sysfd = perf->sysfd;\
402  func_type *tfunc = func;\
403  uint64_t tsum = 0;\
404  uint64_t ti, tcount = 0;\
405  uint64_t t = 0; \
406  const uint64_t truns = FFMAX(bench_runs >> 3, 1);\
407  checkasm_set_signal_handler_state(1);\
408  for (ti = 0; ti < truns; ti++) {\
409  PERF_START(t);\
410  CALL16(__VA_ARGS__);\
411  CALL16(__VA_ARGS__);\
412  PERF_STOP(t);\
413  if (t*tcount <= tsum*4 && ti > 0) {\
414  tsum += t;\
415  tcount++;\
416  }\
417  }\
418  emms_c();\
419  perf->cycles += tsum;\
420  perf->iterations += tcount;\
421  checkasm_set_signal_handler_state(0);\
422  }\
423  } while (0)
424 #else
425 #define bench(func, ...) while(0)
426 #define PERF_START(t) while(0)
427 #define PERF_STOP(t) while(0)
428 #endif
429 
430 #define bench_new(...) bench(func_new, __VA_ARGS__)
431 
432 #define BUF_RECT(type, name, w, h) \
433  LOCAL_ALIGNED_32(type, name##_buf, [((h)+32)*(FFALIGN(w,64)+64) + 64]); \
434  av_unused ptrdiff_t name##_stride = sizeof(type)*(FFALIGN(w,64)+64); \
435  av_unused int name##_buf_h = (h)+32; \
436  type *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
437 
438 #define PIXEL_RECT(name, w, h) \
439  LOCAL_ALIGNED_32(uint8_t, name##_buf, [sizeof(uint16_t) * (((h)+32)*(FFALIGN(w,64)+64) + 64)],); \
440  av_unused ptrdiff_t name##_stride = sizeof(uint16_t) * (FFALIGN(w,64)+64); \
441  av_unused int name##_buf_h = (h)+32; \
442  uint8_t *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
443 
444 #define CLEAR_BUF_RECT(name) \
445  memset(name##_buf, 0x99, name##_stride * name##_buf_h + 64)
446 #define CLEAR_PIXEL_RECT(name) \
447  CLEAR_BUF_RECT(name)
448 
449 #define DECL_CHECKASM_CHECK_FUNC(type) \
450 int checkasm_check_##type(const char *file, int line, \
451  const type *buf1, ptrdiff_t stride1, \
452  const type *buf2, ptrdiff_t stride2, \
453  int w, int h, const char *name, \
454  int align_w, int align_h, \
455  int padding)
456 
457 DECL_CHECKASM_CHECK_FUNC(uint8_t);
458 DECL_CHECKASM_CHECK_FUNC(uint16_t);
459 DECL_CHECKASM_CHECK_FUNC(uint32_t);
460 DECL_CHECKASM_CHECK_FUNC(int16_t);
461 DECL_CHECKASM_CHECK_FUNC(int32_t);
462 
463 int checkasm_check_float_ulp(const char *file, int line,
464  const float *buf1, ptrdiff_t stride1,
465  const float *buf2, ptrdiff_t stride2,
466  int w, int h, const char *name,
467  unsigned max_ulp, int align_w, int align_h,
468  int padding);
469 
470 #define PASTE(a,b) a ## b
471 #define CONCAT(a,b) PASTE(a,b)
472 
473 #define checkasm_check2(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
474 #define checkasm_check(prefix, ...) checkasm_check2(prefix, __VA_ARGS__, 0, 0, 0)
475 /* Check a pointer from BUF_RECT, checking whether there have been
476  * writes outside of the designated area. */
477 #define checkasm_check_padded(...) \
478  checkasm_check2(__VA_ARGS__, 1, 1, 8)
479 /* Check a pointer from BUF_RECT, checking whether there have been
480  * writes outside of the designated area. Allow writing slightly past the
481  * end of the buffer, by aligning w/h to align_w/align_h, and checking
482  * for overwrites outside of that. */
483 #define checkasm_check_padded_align(...) \
484  checkasm_check2(__VA_ARGS__, 8)
485 
486 /* This assumes that there is a local variable named "bit_depth".
487  * For tests that don't have that and only operate on a single
488  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
489 #define checkasm_check_pixel2(buf1, stride1, buf2, stride2, ...) \
490  ((bit_depth > 8) ? \
491  checkasm_check2(uint16_t, (const uint16_t*)buf1, stride1, \
492  (const uint16_t*)buf2, stride2, \
493  __VA_ARGS__) : \
494  checkasm_check2(uint8_t, (const uint8_t*) buf1, stride1, \
495  (const uint8_t*) buf2, stride2, \
496  __VA_ARGS__))
497 #define checkasm_check_pixel(...) \
498  checkasm_check_pixel2(__VA_ARGS__, 0, 0, 0)
499 #define checkasm_check_pixel_padded(...) \
500  checkasm_check_pixel2(__VA_ARGS__, 1, 1, 8)
501 #define checkasm_check_pixel_padded_align(...) \
502  checkasm_check_pixel2(__VA_ARGS__, 8)
503 
504 /* This assumes that there is a local variable named "bit_depth"
505  * and that the type-specific buffers obey the name ## _BITDEPTH
506  * convention.
507  * For tests that don't have that and only operate on a single
508  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
509 #define checkasm_check_dctcoef(buf1, stride1, buf2, stride2, ...) \
510  ((bit_depth > 8) ? \
511  checkasm_check(int32_t, buf1 ## _32, stride1, \
512  buf2 ## _32, stride2, \
513  __VA_ARGS__) : \
514  checkasm_check(int16_t, buf1 ## _16, stride1, \
515  buf2 ## _16, stride2, \
516  __VA_ARGS__))
517 
518 #endif /* TESTS_CHECKASM_CHECKASM_H */
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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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