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_svq1enc(void);
145 void checkasm_check_synth_filter(void);
146 void checkasm_check_sw_gbrp(void);
147 void checkasm_check_sw_range_convert(void);
148 void checkasm_check_sw_rgb(void);
149 void checkasm_check_sw_scale(void);
150 void checkasm_check_sw_xyz2rgb(void);
151 void checkasm_check_sw_yuv2rgb(void);
152 void checkasm_check_sw_yuv2yuv(void);
153 void checkasm_check_sw_ops(void);
154 void checkasm_check_takdsp(void);
155 void checkasm_check_utvideodsp(void);
156 void checkasm_check_v210dec(void);
157 void checkasm_check_v210enc(void);
158 void checkasm_check_vc1dsp(void);
159 void checkasm_check_vf_bwdif(void);
160 void checkasm_check_vf_eq(void);
161 void checkasm_check_vf_fspp(void);
162 void checkasm_check_vf_gblur(void);
163 void checkasm_check_vf_hflip(void);
164 void checkasm_check_vf_threshold(void);
165 void checkasm_check_vf_sobel(void);
166 void checkasm_check_vp3dsp(void);
167 void checkasm_check_vp6dsp(void);
168 void checkasm_check_vp8dsp(void);
169 void checkasm_check_vp9dsp(void);
170 void checkasm_check_vp9_ipred(void);
171 void checkasm_check_vp9_itxfm(void);
172 void checkasm_check_vp9_loopfilter(void);
173 void checkasm_check_vp9_mc(void);
174 void checkasm_check_videodsp(void);
175 void checkasm_check_vorbisdsp(void);
176 void checkasm_check_vvc_alf(void);
177 void checkasm_check_vvc_mc(void);
178 void checkasm_check_vvc_sao(void);
179 
180 struct CheckasmPerf;
181 
182 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
183 int checkasm_bench_func(void);
184 int checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
185 struct CheckasmPerf *checkasm_get_perf_context(void);
186 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
187 void checkasm_set_signal_handler_state(int enabled);
188 int checkasm_handle_signal(int s);
189 extern checkasm_context checkasm_context_buf;
190 
191 /* float compare utilities */
192 int float_near_ulp(float a, float b, unsigned max_ulp);
193 int float_near_abs_eps(float a, float b, float eps);
194 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
195 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
196  unsigned len);
197 int float_near_abs_eps_array(const float *a, const float *b, float eps,
198  unsigned len);
199 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
200  unsigned max_ulp, unsigned len);
201 int double_near_abs_eps(double a, double b, double eps);
202 int double_near_abs_eps_array(const double *a, const double *b, double eps,
203  unsigned len);
204 
205 extern AVLFG checkasm_lfg;
206 #define rnd() av_lfg_get(&checkasm_lfg)
207 
208 av_unused static void *func_ref, *func_new;
209 
210 extern uint64_t bench_runs;
211 
212 /* Decide whether or not the specified function needs to be tested */
213 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
214 #define check_key(key, ...) (checkasm_save_context(), checkasm_check_func(key, __VA_ARGS__))
215 
216 /* Declare the function prototype. The first argument is the return value, the remaining
217  * arguments are the function parameters. Naming parameters is optional. */
218 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
219 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
220 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
221 
222 /* Indicate that the current test has failed */
223 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
224 
225 /* Print the test outcome */
226 #define report checkasm_report
227 
228 /* Call the reference function */
229 #define call_ref(...)\
230  checkasm_call((func_type *)func_ref, __VA_ARGS__)
231 
232 #define checkasm_call(func, ...) \
233  (checkasm_set_signal_handler_state(1),\
234  (func)(__VA_ARGS__));\
235  checkasm_set_signal_handler_state(0)
236 
237 #define call_new(...) checkasm_call_checked(((func_type *)func_new), __VA_ARGS__)
238 
239 #if ARCH_X86 && HAVE_X86ASM
240 /* Verifies that clobbered callee-saved registers are properly saved and restored
241  * and that either no MMX registers are touched or emms is issued */
242 void checkasm_checked_call(void *func, ...);
243 /* Verifies that clobbered callee-saved registers are properly saved and restored
244  * and issues emms for asm functions which are not required to do so */
245 void checkasm_checked_call_emms(void *func, ...);
246 /* Verifies that clobbered callee-saved registers are properly saved and restored
247  * but doesn't issue emms. Meant for dsp functions returning float or double */
248 void checkasm_checked_call_float(void *func, ...);
249 
250 #if ARCH_X86_64
251 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
252  * This is done by clobbering the stack with junk around the stack pointer and calling the
253  * assembly function through checked_call() with added dummy arguments which forces all
254  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
255  * upper half of the 64-bit register locations on the stack will now contain junk which will
256  * cause misbehaving functions to either produce incorrect output or segfault. Note that
257  * even though this works extremely well in practice, it's technically not guaranteed
258  * and false negatives is theoretically possible, but there can never be any false positives.
259  */
260 void checkasm_stack_clobber(uint64_t clobber, ...);
261 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
262  = (void *)checkasm_checked_call;
263 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
264  = (void *)checkasm_checked_call_float;
265 #define declare_new_emms(cpu_flags, ret, ...) \
266  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
267  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
268  (void *)checkasm_checked_call;
269 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
270 #define checkasm_call_checked(func, ...) \
271  (checkasm_set_signal_handler_state(1),\
272  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
273  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
274  checked_call((func), 0, 0, 0, 0, 0, __VA_ARGS__));\
275  checkasm_set_signal_handler_state(0)
276 #elif ARCH_X86_32
277 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
278 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
279 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
280  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
281  (void *)checkasm_checked_call;
282 #define checkasm_call_checked(func, ...)\
283  (checkasm_set_signal_handler_state(1),\
284  checked_call((func), __VA_ARGS__));\
285  checkasm_set_signal_handler_state(0)
286 #endif
287 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
288 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
289  * This makes sure that potential 8-byte-alignment of parameters is kept the same
290  * even when the extra parameters have been removed. */
291 void checkasm_checked_call_vfp(void *func, int dummy, ...);
292 void checkasm_checked_call_novfp(void *func, int dummy, ...);
293 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
294 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
295  int, int, int, int, int, int, int, int, \
296  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
297 #define checkasm_call_checked(func, ...) \
298  (checkasm_set_signal_handler_state(1),\
299  checked_call((func), 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
300  checkasm_set_signal_handler_state(0)
301 #elif ARCH_AARCH64 && !defined(__APPLE__)
302 void checkasm_stack_clobber(uint64_t clobber, ...);
303 void checkasm_checked_call(void *func, ...);
304 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
305  int, int, int, int, int, int, int, int,\
306  int, int, int, int, int, int, int)\
307  = (void *)checkasm_checked_call;
308 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
309 #define checkasm_call_checked(func, ...) (checkasm_set_signal_handler_state(1),\
310  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
311  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
312  checked_call((func), 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
313  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
314  checkasm_set_signal_handler_state(0)
315 #elif ARCH_RISCV
316 void checkasm_set_function(void *);
317 void *checkasm_get_wrapper(void);
318 
319 #if HAVE_RV
320 #define declare_new(ret, ...) \
321  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
322 #define checkasm_call_checked(func, ...) \
323  (checkasm_set_signal_handler_state(1),\
324  checkasm_set_function(func), checked_call(__VA_ARGS__));\
325  checkasm_set_signal_handler_state(0)
326 #else
327 #define declare_new(ret, ...)
328 #define checkasm_call_checked(func, ...)\
329  (checkasm_set_signal_handler_state(1),\
330  (func)(__VA_ARGS__));\
331  checkasm_set_signal_handler_state(0)
332 #endif
333 #else
334 #define declare_new(ret, ...)
335 #define declare_new_float(ret, ...)
336 #define declare_new_emms(cpu_flags, ret, ...)
337 /* Call the function */
338 #define checkasm_call_checked(func, ...)\
339  (checkasm_set_signal_handler_state(1),\
340  (func)(__VA_ARGS__));\
341  checkasm_set_signal_handler_state(0)
342 #endif
343 
344 #ifndef declare_new_emms
345 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
346 #endif
347 #ifndef declare_new_float
348 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
349 #endif
350 
351 typedef struct CheckasmPerf {
352  int sysfd;
353  uint64_t cycles;
354  int iterations;
355 } CheckasmPerf;
356 
357 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
358 
359 #if CONFIG_LINUX_PERF
360 #define PERF_START(t) do { \
361  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
362  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
363 } while (0)
364 #define PERF_STOP(t) do { \
365  int ret; \
366  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
367  ret = read(sysfd, &t, sizeof(t)); \
368  (void)ret; \
369 } while (0)
370 #elif CONFIG_MACOS_KPERF
371 #define PERF_START(t) t = ff_kperf_cycles()
372 #define PERF_STOP(t) t = ff_kperf_cycles() - t
373 #else
374 #define PERF_START(t) t = AV_READ_TIME()
375 #define PERF_STOP(t) t = AV_READ_TIME() - t
376 #endif
377 
378 #define CALL4(...)\
379  do {\
380  tfunc(__VA_ARGS__); \
381  tfunc(__VA_ARGS__); \
382  tfunc(__VA_ARGS__); \
383  tfunc(__VA_ARGS__); \
384  } while (0)
385 
386 #define CALL16(...)\
387  do {\
388  CALL4(__VA_ARGS__); \
389  CALL4(__VA_ARGS__); \
390  CALL4(__VA_ARGS__); \
391  CALL4(__VA_ARGS__); \
392  } while (0)
393 
394 /* Benchmark the function */
395 #define bench(func, ...)\
396  do {\
397  if (checkasm_bench_func()) {\
398  struct CheckasmPerf *perf = checkasm_get_perf_context();\
399  av_unused const int sysfd = perf->sysfd;\
400  func_type *tfunc = func;\
401  uint64_t tsum = 0;\
402  uint64_t ti, tcount = 0;\
403  uint64_t t = 0; \
404  const uint64_t truns = FFMAX(bench_runs >> 3, 1);\
405  checkasm_set_signal_handler_state(1);\
406  for (ti = 0; ti < truns; ti++) {\
407  PERF_START(t);\
408  CALL16(__VA_ARGS__);\
409  CALL16(__VA_ARGS__);\
410  PERF_STOP(t);\
411  if (t*tcount <= tsum*4 && ti > 0) {\
412  tsum += t;\
413  tcount++;\
414  }\
415  }\
416  emms_c();\
417  perf->cycles += tsum;\
418  perf->iterations += tcount;\
419  checkasm_set_signal_handler_state(0);\
420  }\
421  } while (0)
422 #else
423 #define bench(func, ...) while(0)
424 #define PERF_START(t) while(0)
425 #define PERF_STOP(t) while(0)
426 #endif
427 
428 #define bench_new(...) bench(func_new, __VA_ARGS__)
429 
430 #define BUF_RECT(type, name, w, h) \
431  LOCAL_ALIGNED_32(type, name##_buf, [((h)+32)*(FFALIGN(w,64)+64) + 64]); \
432  av_unused ptrdiff_t name##_stride = sizeof(type)*(FFALIGN(w,64)+64); \
433  av_unused int name##_buf_h = (h)+32; \
434  type *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
435 
436 #define PIXEL_RECT(name, w, h) \
437  LOCAL_ALIGNED_32(uint8_t, name##_buf, [sizeof(uint16_t) * (((h)+32)*(FFALIGN(w,64)+64) + 64)],); \
438  av_unused ptrdiff_t name##_stride = sizeof(uint16_t) * (FFALIGN(w,64)+64); \
439  av_unused int name##_buf_h = (h)+32; \
440  uint8_t *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
441 
442 #define CLEAR_BUF_RECT(name) \
443  memset(name##_buf, 0x99, name##_stride * name##_buf_h + 64)
444 #define CLEAR_PIXEL_RECT(name) \
445  CLEAR_BUF_RECT(name)
446 
447 #define DECL_CHECKASM_CHECK_FUNC(type) \
448 int checkasm_check_##type(const char *file, int line, \
449  const type *buf1, ptrdiff_t stride1, \
450  const type *buf2, ptrdiff_t stride2, \
451  int w, int h, const char *name, \
452  int align_w, int align_h, \
453  int padding)
454 
455 DECL_CHECKASM_CHECK_FUNC(uint8_t);
456 DECL_CHECKASM_CHECK_FUNC(uint16_t);
457 DECL_CHECKASM_CHECK_FUNC(uint32_t);
458 DECL_CHECKASM_CHECK_FUNC(int16_t);
459 DECL_CHECKASM_CHECK_FUNC(int32_t);
460 
461 int checkasm_check_float_ulp(const char *file, int line,
462  const float *buf1, ptrdiff_t stride1,
463  const float *buf2, ptrdiff_t stride2,
464  int w, int h, const char *name,
465  unsigned max_ulp, int align_w, int align_h,
466  int padding);
467 
468 #define PASTE(a,b) a ## b
469 #define CONCAT(a,b) PASTE(a,b)
470 
471 #define checkasm_check2(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
472 #define checkasm_check(prefix, ...) checkasm_check2(prefix, __VA_ARGS__, 0, 0, 0)
473 /* Check a pointer from BUF_RECT, checking whether there have been
474  * writes outside of the designated area. */
475 #define checkasm_check_padded(...) \
476  checkasm_check2(__VA_ARGS__, 1, 1, 8)
477 /* Check a pointer from BUF_RECT, checking whether there have been
478  * writes outside of the designated area. Allow writing slightly past the
479  * end of the buffer, by aligning w/h to align_w/align_h, and checking
480  * for overwrites outside of that. */
481 #define checkasm_check_padded_align(...) \
482  checkasm_check2(__VA_ARGS__, 8)
483 
484 /* This assumes that there is a local variable named "bit_depth".
485  * For tests that don't have that and only operate on a single
486  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
487 #define checkasm_check_pixel2(buf1, stride1, buf2, stride2, ...) \
488  ((bit_depth > 8) ? \
489  checkasm_check2(uint16_t, (const uint16_t*)buf1, stride1, \
490  (const uint16_t*)buf2, stride2, \
491  __VA_ARGS__) : \
492  checkasm_check2(uint8_t, (const uint8_t*) buf1, stride1, \
493  (const uint8_t*) buf2, stride2, \
494  __VA_ARGS__))
495 #define checkasm_check_pixel(...) \
496  checkasm_check_pixel2(__VA_ARGS__, 0, 0, 0)
497 #define checkasm_check_pixel_padded(...) \
498  checkasm_check_pixel2(__VA_ARGS__, 1, 1, 8)
499 #define checkasm_check_pixel_padded_align(...) \
500  checkasm_check_pixel2(__VA_ARGS__, 8)
501 
502 /* This assumes that there is a local variable named "bit_depth"
503  * and that the type-specific buffers obey the name ## _BITDEPTH
504  * convention.
505  * For tests that don't have that and only operate on a single
506  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
507 #define checkasm_check_dctcoef(buf1, stride1, buf2, stride2, ...) \
508  ((bit_depth > 8) ? \
509  checkasm_check(int32_t, buf1 ## _32, stride1, \
510  buf2 ## _32, stride2, \
511  __VA_ARGS__) : \
512  checkasm_check(int16_t, buf1 ## _16, stride1, \
513  buf2 ## _16, stride2, \
514  __VA_ARGS__))
515 
516 #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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