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_audiodsp(void);
87 void checkasm_check_av_tx(void);
88 void checkasm_check_blend(void);
89 void checkasm_check_blockdsp(void);
90 void checkasm_check_bswapdsp(void);
91 void checkasm_check_colorspace(void);
92 void checkasm_check_diracdsp(void);
93 void checkasm_check_exrdsp(void);
94 void checkasm_check_fdctdsp(void);
95 void checkasm_check_fixed_dsp(void);
96 void checkasm_check_flacdsp(void);
97 void checkasm_check_float_dsp(void);
98 void checkasm_check_fmtconvert(void);
99 void checkasm_check_g722dsp(void);
100 void checkasm_check_h263dsp(void);
101 void checkasm_check_h264chroma(void);
102 void checkasm_check_h264dsp(void);
103 void checkasm_check_h264pred(void);
104 void checkasm_check_h264qpel(void);
105 void checkasm_check_hevc_add_res(void);
106 void checkasm_check_hevc_deblock(void);
107 void checkasm_check_hevc_idct(void);
108 void checkasm_check_hevc_pel(void);
109 void checkasm_check_hevc_sao(void);
110 void checkasm_check_huffyuvdsp(void);
111 void checkasm_check_idctdsp(void);
112 void checkasm_check_jpeg2000dsp(void);
113 void checkasm_check_llauddsp(void);
114 void checkasm_check_lls(void);
115 void checkasm_check_llviddsp(void);
116 void checkasm_check_llviddspenc(void);
117 void checkasm_check_lpc(void);
118 void checkasm_check_motion(void);
119 void checkasm_check_mpegvideoencdsp(void);
120 void checkasm_check_nlmeans(void);
121 void checkasm_check_opusdsp(void);
122 void checkasm_check_pixblockdsp(void);
123 void checkasm_check_sbrdsp(void);
124 void checkasm_check_rv34dsp(void);
125 void checkasm_check_rv40dsp(void);
126 void checkasm_check_svq1enc(void);
127 void checkasm_check_synth_filter(void);
128 void checkasm_check_sw_gbrp(void);
129 void checkasm_check_sw_range_convert(void);
130 void checkasm_check_sw_rgb(void);
131 void checkasm_check_sw_scale(void);
132 void checkasm_check_sw_yuv2rgb(void);
133 void checkasm_check_sw_yuv2yuv(void);
134 void checkasm_check_takdsp(void);
135 void checkasm_check_utvideodsp(void);
136 void checkasm_check_v210dec(void);
137 void checkasm_check_v210enc(void);
138 void checkasm_check_vc1dsp(void);
139 void checkasm_check_vf_bwdif(void);
140 void checkasm_check_vf_eq(void);
141 void checkasm_check_vf_gblur(void);
142 void checkasm_check_vf_hflip(void);
143 void checkasm_check_vf_threshold(void);
144 void checkasm_check_vf_sobel(void);
145 void checkasm_check_vp8dsp(void);
146 void checkasm_check_vp9dsp(void);
147 void checkasm_check_videodsp(void);
148 void checkasm_check_vorbisdsp(void);
149 void checkasm_check_vvc_alf(void);
150 void checkasm_check_vvc_mc(void);
151 
152 struct CheckasmPerf;
153 
154 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
155 int checkasm_bench_func(void);
156 int checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
157 struct CheckasmPerf *checkasm_get_perf_context(void);
158 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
159 void checkasm_set_signal_handler_state(int enabled);
160 int checkasm_handle_signal(int s);
161 extern checkasm_context checkasm_context_buf;
162 
163 /* float compare utilities */
164 int float_near_ulp(float a, float b, unsigned max_ulp);
165 int float_near_abs_eps(float a, float b, float eps);
166 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
167 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
168  unsigned len);
169 int float_near_abs_eps_array(const float *a, const float *b, float eps,
170  unsigned len);
171 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
172  unsigned max_ulp, unsigned len);
173 int double_near_abs_eps(double a, double b, double eps);
174 int double_near_abs_eps_array(const double *a, const double *b, double eps,
175  unsigned len);
176 
177 extern AVLFG checkasm_lfg;
178 #define rnd() av_lfg_get(&checkasm_lfg)
179 
180 static av_unused void *func_ref, *func_new;
181 
182 extern uint64_t bench_runs;
183 
184 /* Decide whether or not the specified function needs to be tested */
185 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
186 
187 /* Declare the function prototype. The first argument is the return value, the remaining
188  * arguments are the function parameters. Naming parameters is optional. */
189 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
190 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
191 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
192 
193 /* Indicate that the current test has failed */
194 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
195 
196 /* Print the test outcome */
197 #define report checkasm_report
198 
199 /* Call the reference function */
200 #define call_ref(...)\
201  (checkasm_set_signal_handler_state(1),\
202  ((func_type *)func_ref)(__VA_ARGS__));\
203  checkasm_set_signal_handler_state(0)
204 
205 #if ARCH_X86 && HAVE_X86ASM
206 /* Verifies that clobbered callee-saved registers are properly saved and restored
207  * and that either no MMX registers are touched or emms is issued */
208 void checkasm_checked_call(void *func, ...);
209 /* Verifies that clobbered callee-saved registers are properly saved and restored
210  * and issues emms for asm functions which are not required to do so */
211 void checkasm_checked_call_emms(void *func, ...);
212 /* Verifies that clobbered callee-saved registers are properly saved and restored
213  * but doesn't issue emms. Meant for dsp functions returning float or double */
214 void checkasm_checked_call_float(void *func, ...);
215 
216 #if ARCH_X86_64
217 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
218  * This is done by clobbering the stack with junk around the stack pointer and calling the
219  * assembly function through checked_call() with added dummy arguments which forces all
220  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
221  * upper half of the 64-bit register locations on the stack will now contain junk which will
222  * cause misbehaving functions to either produce incorrect output or segfault. Note that
223  * even though this works extremely well in practice, it's technically not guaranteed
224  * and false negatives is theoretically possible, but there can never be any false positives.
225  */
226 void checkasm_stack_clobber(uint64_t clobber, ...);
227 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
228  = (void *)checkasm_checked_call;
229 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
230  = (void *)checkasm_checked_call_float;
231 #define declare_new_emms(cpu_flags, ret, ...) \
232  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
233  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
234  (void *)checkasm_checked_call;
235 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
236 #define call_new(...) (checkasm_set_signal_handler_state(1),\
237  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
238  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
239  checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__));\
240  checkasm_set_signal_handler_state(0)
241 #elif ARCH_X86_32
242 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
243 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
244 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
245  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
246  (void *)checkasm_checked_call;
247 #define call_new(...)\
248  (checkasm_set_signal_handler_state(1),\
249  checked_call(func_new, __VA_ARGS__));\
250  checkasm_set_signal_handler_state(0)
251 #endif
252 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
253 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
254  * This makes sure that potential 8-byte-alignment of parameters is kept the same
255  * even when the extra parameters have been removed. */
256 void checkasm_checked_call_vfp(void *func, int dummy, ...);
257 void checkasm_checked_call_novfp(void *func, int dummy, ...);
258 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
259 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
260  int, int, int, int, int, int, int, int, \
261  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
262 #define call_new(...) \
263  (checkasm_set_signal_handler_state(1),\
264  checked_call(func_new, 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
265  checkasm_set_signal_handler_state(0)
266 #elif ARCH_AARCH64 && !defined(__APPLE__)
267 void checkasm_stack_clobber(uint64_t clobber, ...);
268 void checkasm_checked_call(void *func, ...);
269 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
270  int, int, int, int, int, int, int, int,\
271  int, int, int, int, int, int, int)\
272  = (void *)checkasm_checked_call;
273 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
274 #define call_new(...) (checkasm_set_signal_handler_state(1),\
275  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
276  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
277  checked_call(func_new, 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
278  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
279  checkasm_set_signal_handler_state(0)
280 #elif ARCH_RISCV
281 void checkasm_set_function(void *);
282 void *checkasm_get_wrapper(void);
283 
284 #if HAVE_RV && (__riscv_xlen == 64) && defined (__riscv_d)
285 #define declare_new(ret, ...) \
286  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
287 #define call_new(...) \
288  (checkasm_set_signal_handler_state(1),\
289  checkasm_set_function(func_new), checked_call(__VA_ARGS__));\
290  checkasm_set_signal_handler_state(0)
291 #else
292 #define declare_new(ret, ...)
293 #define call_new(...)\
294  (checkasm_set_signal_handler_state(1),\
295  ((func_type *)func_new)(__VA_ARGS__));\
296  checkasm_set_signal_handler_state(0)
297 #endif
298 #else
299 #define declare_new(ret, ...)
300 #define declare_new_float(ret, ...)
301 #define declare_new_emms(cpu_flags, ret, ...)
302 /* Call the function */
303 #define call_new(...)\
304  (checkasm_set_signal_handler_state(1),\
305  ((func_type *)func_new)(__VA_ARGS__));\
306  checkasm_set_signal_handler_state(0)
307 #endif
308 
309 #ifndef declare_new_emms
310 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
311 #endif
312 #ifndef declare_new_float
313 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
314 #endif
315 
316 typedef struct CheckasmPerf {
317  int sysfd;
318  uint64_t cycles;
319  int iterations;
320 } CheckasmPerf;
321 
322 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
323 
324 #if CONFIG_LINUX_PERF
325 #define PERF_START(t) do { \
326  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
327  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
328 } while (0)
329 #define PERF_STOP(t) do { \
330  int ret; \
331  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
332  ret = read(sysfd, &t, sizeof(t)); \
333  (void)ret; \
334 } while (0)
335 #elif CONFIG_MACOS_KPERF
336 #define PERF_START(t) t = ff_kperf_cycles()
337 #define PERF_STOP(t) t = ff_kperf_cycles() - t
338 #else
339 #define PERF_START(t) t = AV_READ_TIME()
340 #define PERF_STOP(t) t = AV_READ_TIME() - t
341 #endif
342 
343 /* Benchmark the function */
344 #define bench_new(...)\
345  do {\
346  if (checkasm_bench_func()) {\
347  struct CheckasmPerf *perf = checkasm_get_perf_context();\
348  av_unused const int sysfd = perf->sysfd;\
349  func_type *tfunc = func_new;\
350  uint64_t tsum = 0;\
351  uint64_t ti, tcount = 0;\
352  uint64_t t = 0; \
353  const uint64_t truns = bench_runs;\
354  checkasm_set_signal_handler_state(1);\
355  for (ti = 0; ti < truns; ti++) {\
356  PERF_START(t);\
357  tfunc(__VA_ARGS__);\
358  tfunc(__VA_ARGS__);\
359  tfunc(__VA_ARGS__);\
360  tfunc(__VA_ARGS__);\
361  PERF_STOP(t);\
362  if (t*tcount <= tsum*4 && ti > 0) {\
363  tsum += t;\
364  tcount++;\
365  }\
366  }\
367  emms_c();\
368  perf->cycles += tsum;\
369  perf->iterations += tcount;\
370  checkasm_set_signal_handler_state(0);\
371  }\
372  } while (0)
373 #else
374 #define bench_new(...) while(0)
375 #define PERF_START(t) while(0)
376 #define PERF_STOP(t) while(0)
377 #endif
378 
379 #define BUF_RECT(type, name, w, h) \
380  LOCAL_ALIGNED_32(type, name##_buf, [((h)+32)*(FFALIGN(w,64)+64) + 64]); \
381  av_unused ptrdiff_t name##_stride = sizeof(type)*(FFALIGN(w,64)+64); \
382  av_unused int name##_buf_h = (h)+32; \
383  type *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
384 
385 #define PIXEL_RECT(name, w, h) \
386  LOCAL_ALIGNED_32(uint8_t, name##_buf, [sizeof(uint16_t) * (((h)+32)*(FFALIGN(w,64)+64) + 64)],); \
387  av_unused ptrdiff_t name##_stride = sizeof(uint16_t) * (FFALIGN(w,64)+64); \
388  av_unused int name##_buf_h = (h)+32; \
389  uint8_t *name = name##_buf + (FFALIGN(w,64)+64)*16 + 64
390 
391 #define CLEAR_BUF_RECT(name) \
392  memset(name##_buf, 0x99, name##_stride * name##_buf_h + 64)
393 #define CLEAR_PIXEL_RECT(name) \
394  CLEAR_BUF_RECT(name)
395 
396 #define DECL_CHECKASM_CHECK_FUNC(type) \
397 int checkasm_check_##type(const char *file, int line, \
398  const type *buf1, ptrdiff_t stride1, \
399  const type *buf2, ptrdiff_t stride2, \
400  int w, int h, const char *name, \
401  int align_w, int align_h, \
402  int padding)
403 
404 DECL_CHECKASM_CHECK_FUNC(uint8_t);
405 DECL_CHECKASM_CHECK_FUNC(uint16_t);
406 DECL_CHECKASM_CHECK_FUNC(uint32_t);
407 DECL_CHECKASM_CHECK_FUNC(int16_t);
408 DECL_CHECKASM_CHECK_FUNC(int32_t);
409 
410 #define PASTE(a,b) a ## b
411 #define CONCAT(a,b) PASTE(a,b)
412 
413 #define checkasm_check2(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
414 #define checkasm_check(prefix, ...) checkasm_check2(prefix, __VA_ARGS__, 0, 0, 0)
415 /* Check a pointer from BUF_RECT, checking whether there have been
416  * writes outside of the designated area. */
417 #define checkasm_check_padded(...) \
418  checkasm_check2(__VA_ARGS__, 1, 1, 8)
419 /* Check a pointer from BUF_RECT, checking whether there have been
420  * writes outside of the designated area. Allow writing slightly past the
421  * end of the buffer, by aligning w/h to align_w/align_h, and checking
422  * for overwrites outside of that. */
423 #define checkasm_check_padded_align(...) \
424  checkasm_check2(__VA_ARGS__, 8)
425 
426 /* This assumes that there is a local variable named "bit_depth".
427  * For tests that don't have that and only operate on a single
428  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
429 #define checkasm_check_pixel2(buf1, stride1, buf2, stride2, ...) \
430  ((bit_depth > 8) ? \
431  checkasm_check2(uint16_t, (const uint16_t*)buf1, stride1, \
432  (const uint16_t*)buf2, stride2, \
433  __VA_ARGS__) : \
434  checkasm_check2(uint8_t, (const uint8_t*) buf1, stride1, \
435  (const uint8_t*) buf2, stride2, \
436  __VA_ARGS__))
437 #define checkasm_check_pixel(...) \
438  checkasm_check_pixel2(__VA_ARGS__, 0, 0, 0)
439 #define checkasm_check_pixel_padded(...) \
440  checkasm_check_pixel2(__VA_ARGS__, 1, 1, 8)
441 #define checkasm_check_pixel_padded_align(...) \
442  checkasm_check_pixel2(__VA_ARGS__, 8)
443 
444 
445 #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:415
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:1080
b
#define b
Definition: input.c:42
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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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