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 ARCH_X86_32
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_blend(void);
90 void checkasm_check_blockdsp(void);
91 void checkasm_check_bswapdsp(void);
92 void checkasm_check_colorspace(void);
93 void checkasm_check_diracdsp(void);
94 void checkasm_check_exrdsp(void);
95 void checkasm_check_fdctdsp(void);
96 void checkasm_check_fixed_dsp(void);
97 void checkasm_check_flacdsp(void);
98 void checkasm_check_float_dsp(void);
99 void checkasm_check_fmtconvert(void);
100 void checkasm_check_g722dsp(void);
101 void checkasm_check_h263dsp(void);
102 void checkasm_check_h264chroma(void);
103 void checkasm_check_h264dsp(void);
104 void checkasm_check_h264pred(void);
105 void checkasm_check_h264qpel(void);
106 void checkasm_check_hevc_add_res(void);
107 void checkasm_check_hevc_deblock(void);
108 void checkasm_check_hevc_idct(void);
109 void checkasm_check_hevc_pel(void);
110 void checkasm_check_hevc_sao(void);
111 void checkasm_check_huffyuvdsp(void);
112 void checkasm_check_idctdsp(void);
113 void checkasm_check_jpeg2000dsp(void);
114 void checkasm_check_llauddsp(void);
115 void checkasm_check_lls(void);
116 void checkasm_check_llviddsp(void);
117 void checkasm_check_llviddspenc(void);
118 void checkasm_check_lpc(void);
119 void checkasm_check_motion(void);
120 void checkasm_check_mpegvideoencdsp(void);
121 void checkasm_check_nlmeans(void);
122 void checkasm_check_opusdsp(void);
123 void checkasm_check_pixblockdsp(void);
124 void checkasm_check_sbrdsp(void);
125 void checkasm_check_rv34dsp(void);
126 void checkasm_check_rv40dsp(void);
127 void checkasm_check_svq1enc(void);
128 void checkasm_check_synth_filter(void);
129 void checkasm_check_sw_gbrp(void);
130 void checkasm_check_sw_range_convert(void);
131 void checkasm_check_sw_rgb(void);
132 void checkasm_check_sw_scale(void);
133 void checkasm_check_sw_yuv2rgb(void);
134 void checkasm_check_sw_yuv2yuv(void);
135 void checkasm_check_takdsp(void);
136 void checkasm_check_utvideodsp(void);
137 void checkasm_check_v210dec(void);
138 void checkasm_check_v210enc(void);
139 void checkasm_check_vc1dsp(void);
140 void checkasm_check_vf_bwdif(void);
141 void checkasm_check_vf_eq(void);
142 void checkasm_check_vf_gblur(void);
143 void checkasm_check_vf_hflip(void);
144 void checkasm_check_vf_threshold(void);
145 void checkasm_check_vf_sobel(void);
146 void checkasm_check_vp8dsp(void);
147 void checkasm_check_vp9dsp(void);
148 void checkasm_check_videodsp(void);
149 void checkasm_check_vorbisdsp(void);
150 void checkasm_check_vvc_alf(void);
151 void checkasm_check_vvc_mc(void);
152 
153 struct CheckasmPerf;
154 
155 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
156 int checkasm_bench_func(void);
157 int checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
158 struct CheckasmPerf *checkasm_get_perf_context(void);
159 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
160 void checkasm_set_signal_handler_state(int enabled);
161 int checkasm_handle_signal(int s);
162 extern checkasm_context checkasm_context_buf;
163 
164 /* float compare utilities */
165 int float_near_ulp(float a, float b, unsigned max_ulp);
166 int float_near_abs_eps(float a, float b, float eps);
167 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
168 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
169  unsigned len);
170 int float_near_abs_eps_array(const float *a, const float *b, float eps,
171  unsigned len);
172 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
173  unsigned max_ulp, unsigned len);
174 int double_near_abs_eps(double a, double b, double eps);
175 int double_near_abs_eps_array(const double *a, const double *b, double eps,
176  unsigned len);
177 
178 extern AVLFG checkasm_lfg;
179 #define rnd() av_lfg_get(&checkasm_lfg)
180 
181 static av_unused void *func_ref, *func_new;
182 
183 extern uint64_t bench_runs;
184 
185 /* Decide whether or not the specified function needs to be tested */
186 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
187 
188 /* Declare the function prototype. The first argument is the return value, the remaining
189  * arguments are the function parameters. Naming parameters is optional. */
190 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
191 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
192 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
193 
194 /* Indicate that the current test has failed */
195 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
196 
197 /* Print the test outcome */
198 #define report checkasm_report
199 
200 /* Call the reference function */
201 #define call_ref(...)\
202  (checkasm_set_signal_handler_state(1),\
203  ((func_type *)func_ref)(__VA_ARGS__));\
204  checkasm_set_signal_handler_state(0)
205 
206 #if ARCH_X86 && HAVE_X86ASM
207 /* Verifies that clobbered callee-saved registers are properly saved and restored
208  * and that either no MMX registers are touched or emms is issued */
209 void checkasm_checked_call(void *func, ...);
210 /* Verifies that clobbered callee-saved registers are properly saved and restored
211  * and issues emms for asm functions which are not required to do so */
212 void checkasm_checked_call_emms(void *func, ...);
213 /* Verifies that clobbered callee-saved registers are properly saved and restored
214  * but doesn't issue emms. Meant for dsp functions returning float or double */
215 void checkasm_checked_call_float(void *func, ...);
216 
217 #if ARCH_X86_64
218 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
219  * This is done by clobbering the stack with junk around the stack pointer and calling the
220  * assembly function through checked_call() with added dummy arguments which forces all
221  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
222  * upper half of the 64-bit register locations on the stack will now contain junk which will
223  * cause misbehaving functions to either produce incorrect output or segfault. Note that
224  * even though this works extremely well in practice, it's technically not guaranteed
225  * and false negatives is theoretically possible, but there can never be any false positives.
226  */
227 void checkasm_stack_clobber(uint64_t clobber, ...);
228 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
229  = (void *)checkasm_checked_call;
230 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
231  = (void *)checkasm_checked_call_float;
232 #define declare_new_emms(cpu_flags, ret, ...) \
233  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
234  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
235  (void *)checkasm_checked_call;
236 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
237 #define call_new(...) (checkasm_set_signal_handler_state(1),\
238  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
239  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
240  checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__));\
241  checkasm_set_signal_handler_state(0)
242 #elif ARCH_X86_32
243 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
244 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
245 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
246  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
247  (void *)checkasm_checked_call;
248 #define call_new(...)\
249  (checkasm_set_signal_handler_state(1),\
250  checked_call(func_new, __VA_ARGS__));\
251  checkasm_set_signal_handler_state(0)
252 #endif
253 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
254 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
255  * This makes sure that potential 8-byte-alignment of parameters is kept the same
256  * even when the extra parameters have been removed. */
257 void checkasm_checked_call_vfp(void *func, int dummy, ...);
258 void checkasm_checked_call_novfp(void *func, int dummy, ...);
259 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
260 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
261  int, int, int, int, int, int, int, int, \
262  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
263 #define call_new(...) \
264  (checkasm_set_signal_handler_state(1),\
265  checked_call(func_new, 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
266  checkasm_set_signal_handler_state(0)
267 #elif ARCH_AARCH64 && !defined(__APPLE__)
268 void checkasm_stack_clobber(uint64_t clobber, ...);
269 void checkasm_checked_call(void *func, ...);
270 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
271  int, int, int, int, int, int, int, int,\
272  int, int, int, int, int, int, int)\
273  = (void *)checkasm_checked_call;
274 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
275 #define call_new(...) (checkasm_set_signal_handler_state(1),\
276  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
277  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
278  checked_call(func_new, 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
279  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
280  checkasm_set_signal_handler_state(0)
281 #elif ARCH_RISCV
282 void checkasm_set_function(void *);
283 void *checkasm_get_wrapper(void);
284 
285 #if HAVE_RV && (__riscv_xlen == 64) && defined (__riscv_d)
286 #define declare_new(ret, ...) \
287  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
288 #define call_new(...) \
289  (checkasm_set_signal_handler_state(1),\
290  checkasm_set_function(func_new), checked_call(__VA_ARGS__));\
291  checkasm_set_signal_handler_state(0)
292 #else
293 #define declare_new(ret, ...)
294 #define call_new(...)\
295  (checkasm_set_signal_handler_state(1),\
296  ((func_type *)func_new)(__VA_ARGS__));\
297  checkasm_set_signal_handler_state(0)
298 #endif
299 #else
300 #define declare_new(ret, ...)
301 #define declare_new_float(ret, ...)
302 #define declare_new_emms(cpu_flags, ret, ...)
303 /* Call the function */
304 #define call_new(...)\
305  (checkasm_set_signal_handler_state(1),\
306  ((func_type *)func_new)(__VA_ARGS__));\
307  checkasm_set_signal_handler_state(0)
308 #endif
309 
310 #ifndef declare_new_emms
311 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
312 #endif
313 #ifndef declare_new_float
314 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
315 #endif
316 
317 typedef struct CheckasmPerf {
318  int sysfd;
319  uint64_t cycles;
320  int iterations;
321 } CheckasmPerf;
322 
323 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
324 
325 #if CONFIG_LINUX_PERF
326 #define PERF_START(t) do { \
327  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
328  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
329 } while (0)
330 #define PERF_STOP(t) do { \
331  int ret; \
332  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
333  ret = read(sysfd, &t, sizeof(t)); \
334  (void)ret; \
335 } while (0)
336 #elif CONFIG_MACOS_KPERF
337 #define PERF_START(t) t = ff_kperf_cycles()
338 #define PERF_STOP(t) t = ff_kperf_cycles() - t
339 #else
340 #define PERF_START(t) t = AV_READ_TIME()
341 #define PERF_STOP(t) t = AV_READ_TIME() - t
342 #endif
343 
344 /* Benchmark the function */
345 #define bench_new(...)\
346  do {\
347  if (checkasm_bench_func()) {\
348  struct CheckasmPerf *perf = checkasm_get_perf_context();\
349  av_unused const int sysfd = perf->sysfd;\
350  func_type *tfunc = func_new;\
351  uint64_t tsum = 0;\
352  uint64_t ti, tcount = 0;\
353  uint64_t t = 0; \
354  const uint64_t truns = bench_runs;\
355  checkasm_set_signal_handler_state(1);\
356  for (ti = 0; ti < truns; ti++) {\
357  PERF_START(t);\
358  tfunc(__VA_ARGS__);\
359  tfunc(__VA_ARGS__);\
360  tfunc(__VA_ARGS__);\
361  tfunc(__VA_ARGS__);\
362  PERF_STOP(t);\
363  if (t*tcount <= tsum*4 && ti > 0) {\
364  tsum += t;\
365  tcount++;\
366  }\
367  }\
368  emms_c();\
369  perf->cycles += tsum;\
370  perf->iterations += tcount;\
371  checkasm_set_signal_handler_state(0);\
372  }\
373  } while (0)
374 #else
375 #define bench_new(...) while(0)
376 #define PERF_START(t) while(0)
377 #define PERF_STOP(t) while(0)
378 #endif
379 
380 #define BUF_RECT(type, name, w, h) \
381  LOCAL_ALIGNED_32(type, name##_buf, [((h)+32)*(FFALIGN(w,64)+64) + 64]); \
382  av_unused ptrdiff_t name##_stride = sizeof(type)*(FFALIGN(w,64)+64); \
383  av_unused int name##_buf_h = (h)+32; \
384  type *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
385 
386 #define PIXEL_RECT(name, w, h) \
387  LOCAL_ALIGNED_32(uint8_t, name##_buf, [sizeof(uint16_t) * (((h)+32)*(FFALIGN(w,64)+64) + 64)],); \
388  av_unused ptrdiff_t name##_stride = sizeof(uint16_t) * (FFALIGN(w,64)+64); \
389  av_unused int name##_buf_h = (h)+32; \
390  uint8_t *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
391 
392 #define CLEAR_BUF_RECT(name) \
393  memset(name##_buf, 0x99, name##_stride * name##_buf_h + 64)
394 #define CLEAR_PIXEL_RECT(name) \
395  CLEAR_BUF_RECT(name)
396 
397 #define DECL_CHECKASM_CHECK_FUNC(type) \
398 int checkasm_check_##type(const char *file, int line, \
399  const type *buf1, ptrdiff_t stride1, \
400  const type *buf2, ptrdiff_t stride2, \
401  int w, int h, const char *name, \
402  int align_w, int align_h, \
403  int padding)
404 
405 DECL_CHECKASM_CHECK_FUNC(uint8_t);
406 DECL_CHECKASM_CHECK_FUNC(uint16_t);
407 DECL_CHECKASM_CHECK_FUNC(uint32_t);
408 DECL_CHECKASM_CHECK_FUNC(int16_t);
409 DECL_CHECKASM_CHECK_FUNC(int32_t);
410 
411 #define PASTE(a,b) a ## b
412 #define CONCAT(a,b) PASTE(a,b)
413 
414 #define checkasm_check2(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
415 #define checkasm_check(prefix, ...) checkasm_check2(prefix, __VA_ARGS__, 0, 0, 0)
416 /* Check a pointer from BUF_RECT, checking whether there have been
417  * writes outside of the designated area. */
418 #define checkasm_check_padded(...) \
419  checkasm_check2(__VA_ARGS__, 1, 1, 8)
420 /* Check a pointer from BUF_RECT, checking whether there have been
421  * writes outside of the designated area. Allow writing slightly past the
422  * end of the buffer, by aligning w/h to align_w/align_h, and checking
423  * for overwrites outside of that. */
424 #define checkasm_check_padded_align(...) \
425  checkasm_check2(__VA_ARGS__, 8)
426 
427 /* This assumes that there is a local variable named "bit_depth".
428  * For tests that don't have that and only operate on a single
429  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
430 #define checkasm_check_pixel2(buf1, stride1, buf2, stride2, ...) \
431  ((bit_depth > 8) ? \
432  checkasm_check2(uint16_t, (const uint16_t*)buf1, stride1, \
433  (const uint16_t*)buf2, stride2, \
434  __VA_ARGS__) : \
435  checkasm_check2(uint8_t, (const uint8_t*) buf1, stride1, \
436  (const uint8_t*) buf2, stride2, \
437  __VA_ARGS__))
438 #define checkasm_check_pixel(...) \
439  checkasm_check_pixel2(__VA_ARGS__, 0, 0, 0)
440 #define checkasm_check_pixel_padded(...) \
441  checkasm_check_pixel2(__VA_ARGS__, 1, 1, 8)
442 #define checkasm_check_pixel_padded_align(...) \
443  checkasm_check_pixel2(__VA_ARGS__, 8)
444 
445 
446 #endif /* TESTS_CHECKASM_CHECKASM_H */
checkasm_check_nlmeans
void checkasm_check_nlmeans(void)
Definition: vf_nlmeans.c:32
func
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:68
checkasm_lfg
AVLFG checkasm_lfg
Definition: checkasm.c:418
checkasm_check_sw_gbrp
void checkasm_check_sw_gbrp(void)
Definition: sw_gbrp.c:398
checkasm_check_vp8dsp
void checkasm_check_vp8dsp(void)
Definition: vp8dsp.c:511
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
Definition: writing_filters.txt:88
checkasm_check_fdctdsp
void checkasm_check_fdctdsp(void)
Definition: fdctdsp.c:67
checkasm_check_videodsp
void checkasm_check_videodsp(void)
Definition: videodsp.c:80
checkasm_check_vf_eq
void checkasm_check_vf_eq(void)
Definition: vf_eq.c:76
checkasm_check_v210dec
void checkasm_check_v210dec(void)
Definition: v210dec.c:47
checkasm_check_sw_yuv2yuv
void checkasm_check_sw_yuv2yuv(void)
Definition: sw_yuv2yuv.c:131
checkasm_check_aacencdsp
void checkasm_check_aacencdsp(void)
Definition: aacencdsp.c:100
av_unused
#define av_unused
Definition: attributes.h:131
checkasm_check_hevc_idct
void checkasm_check_hevc_idct(void)
Definition: hevc_idct.c:108
checkasm_check_sw_scale
void checkasm_check_sw_scale(void)
Definition: sw_scale.c:437
checkasm_bench_func
void int checkasm_bench_func(void)
Definition: checkasm.c:1083
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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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CONTEXT
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