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 #else
70 #include <setjmp.h>
71 typedef sigjmp_buf checkasm_context;
72 #define checkasm_save_context() checkasm_handle_signal(sigsetjmp(checkasm_context_buf, 1))
73 #define checkasm_load_context(s) siglongjmp(checkasm_context_buf, s)
74 #endif
75 
76 void checkasm_check_aacencdsp(void);
77 void checkasm_check_aacpsdsp(void);
78 void checkasm_check_ac3dsp(void);
79 void checkasm_check_afir(void);
80 void checkasm_check_alacdsp(void);
81 void checkasm_check_audiodsp(void);
82 void checkasm_check_av_tx(void);
83 void checkasm_check_blend(void);
84 void checkasm_check_blockdsp(void);
85 void checkasm_check_bswapdsp(void);
86 void checkasm_check_colorspace(void);
87 void checkasm_check_exrdsp(void);
88 void checkasm_check_fdctdsp(void);
89 void checkasm_check_fixed_dsp(void);
90 void checkasm_check_flacdsp(void);
91 void checkasm_check_float_dsp(void);
92 void checkasm_check_fmtconvert(void);
93 void checkasm_check_g722dsp(void);
94 void checkasm_check_h263dsp(void);
95 void checkasm_check_h264chroma(void);
96 void checkasm_check_h264dsp(void);
97 void checkasm_check_h264pred(void);
98 void checkasm_check_h264qpel(void);
99 void checkasm_check_hevc_add_res(void);
100 void checkasm_check_hevc_deblock(void);
101 void checkasm_check_hevc_idct(void);
102 void checkasm_check_hevc_pel(void);
103 void checkasm_check_hevc_sao(void);
104 void checkasm_check_huffyuvdsp(void);
105 void checkasm_check_idctdsp(void);
106 void checkasm_check_jpeg2000dsp(void);
107 void checkasm_check_llauddsp(void);
108 void checkasm_check_lls(void);
109 void checkasm_check_llviddsp(void);
110 void checkasm_check_llviddspenc(void);
111 void checkasm_check_lpc(void);
112 void checkasm_check_motion(void);
113 void checkasm_check_mpegvideoencdsp(void);
114 void checkasm_check_nlmeans(void);
115 void checkasm_check_opusdsp(void);
116 void checkasm_check_pixblockdsp(void);
117 void checkasm_check_sbrdsp(void);
118 void checkasm_check_rv34dsp(void);
119 void checkasm_check_rv40dsp(void);
120 void checkasm_check_svq1enc(void);
121 void checkasm_check_synth_filter(void);
122 void checkasm_check_sw_gbrp(void);
123 void checkasm_check_sw_range_convert(void);
124 void checkasm_check_sw_rgb(void);
125 void checkasm_check_sw_scale(void);
126 void checkasm_check_sw_yuv2rgb(void);
127 void checkasm_check_sw_yuv2yuv(void);
128 void checkasm_check_takdsp(void);
129 void checkasm_check_utvideodsp(void);
130 void checkasm_check_v210dec(void);
131 void checkasm_check_v210enc(void);
132 void checkasm_check_vc1dsp(void);
133 void checkasm_check_vf_bwdif(void);
134 void checkasm_check_vf_eq(void);
135 void checkasm_check_vf_gblur(void);
136 void checkasm_check_vf_hflip(void);
137 void checkasm_check_vf_threshold(void);
138 void checkasm_check_vf_sobel(void);
139 void checkasm_check_vp8dsp(void);
140 void checkasm_check_vp9dsp(void);
141 void checkasm_check_videodsp(void);
142 void checkasm_check_vorbisdsp(void);
143 void checkasm_check_vvc_alf(void);
144 void checkasm_check_vvc_mc(void);
145 
146 struct CheckasmPerf;
147 
148 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
149 int checkasm_bench_func(void);
150 void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
151 struct CheckasmPerf *checkasm_get_perf_context(void);
152 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
153 void checkasm_set_signal_handler_state(int enabled);
154 int checkasm_handle_signal(int s);
155 extern checkasm_context checkasm_context_buf;
156 
157 /* float compare utilities */
158 int float_near_ulp(float a, float b, unsigned max_ulp);
159 int float_near_abs_eps(float a, float b, float eps);
160 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
161 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
162  unsigned len);
163 int float_near_abs_eps_array(const float *a, const float *b, float eps,
164  unsigned len);
165 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
166  unsigned max_ulp, unsigned len);
167 int double_near_abs_eps(double a, double b, double eps);
168 int double_near_abs_eps_array(const double *a, const double *b, double eps,
169  unsigned len);
170 
171 extern AVLFG checkasm_lfg;
172 #define rnd() av_lfg_get(&checkasm_lfg)
173 
174 static av_unused void *func_ref, *func_new;
175 
176 extern uint64_t bench_runs;
177 
178 /* Decide whether or not the specified function needs to be tested */
179 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
180 
181 /* Declare the function prototype. The first argument is the return value, the remaining
182  * arguments are the function parameters. Naming parameters is optional. */
183 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
184 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
185 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
186 
187 /* Indicate that the current test has failed */
188 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
189 
190 /* Print the test outcome */
191 #define report checkasm_report
192 
193 /* Call the reference function */
194 #define call_ref(...)\
195  (checkasm_set_signal_handler_state(1),\
196  ((func_type *)func_ref)(__VA_ARGS__));\
197  checkasm_set_signal_handler_state(0)
198 
199 #if ARCH_X86 && HAVE_X86ASM
200 /* Verifies that clobbered callee-saved registers are properly saved and restored
201  * and that either no MMX registers are touched or emms is issued */
202 void checkasm_checked_call(void *func, ...);
203 /* Verifies that clobbered callee-saved registers are properly saved and restored
204  * and issues emms for asm functions which are not required to do so */
205 void checkasm_checked_call_emms(void *func, ...);
206 /* Verifies that clobbered callee-saved registers are properly saved and restored
207  * but doesn't issue emms. Meant for dsp functions returning float or double */
208 void checkasm_checked_call_float(void *func, ...);
209 
210 #if ARCH_X86_64
211 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
212  * This is done by clobbering the stack with junk around the stack pointer and calling the
213  * assembly function through checked_call() with added dummy arguments which forces all
214  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
215  * upper half of the 64-bit register locations on the stack will now contain junk which will
216  * cause misbehaving functions to either produce incorrect output or segfault. Note that
217  * even though this works extremely well in practice, it's technically not guaranteed
218  * and false negatives is theoretically possible, but there can never be any false positives.
219  */
220 void checkasm_stack_clobber(uint64_t clobber, ...);
221 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
222  = (void *)checkasm_checked_call;
223 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
224  = (void *)checkasm_checked_call_float;
225 #define declare_new_emms(cpu_flags, ret, ...) \
226  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
227  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
228  (void *)checkasm_checked_call;
229 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
230 #define call_new(...) (checkasm_set_signal_handler_state(1),\
231  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
232  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
233  checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__));\
234  checkasm_set_signal_handler_state(0)
235 #elif ARCH_X86_32
236 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
237 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
238 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
239  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
240  (void *)checkasm_checked_call;
241 #define call_new(...)\
242  (checkasm_set_signal_handler_state(1),\
243  checked_call(func_new, __VA_ARGS__));\
244  checkasm_set_signal_handler_state(0)
245 #endif
246 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
247 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
248  * This makes sure that potential 8-byte-alignment of parameters is kept the same
249  * even when the extra parameters have been removed. */
250 void checkasm_checked_call_vfp(void *func, int dummy, ...);
251 void checkasm_checked_call_novfp(void *func, int dummy, ...);
252 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
253 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
254  int, int, int, int, int, int, int, int, \
255  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
256 #define call_new(...) \
257  (checkasm_set_signal_handler_state(1),\
258  checked_call(func_new, 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
259  checkasm_set_signal_handler_state(0)
260 #elif ARCH_AARCH64 && !defined(__APPLE__)
261 void checkasm_stack_clobber(uint64_t clobber, ...);
262 void checkasm_checked_call(void *func, ...);
263 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
264  int, int, int, int, int, int, int, int,\
265  int, int, int, int, int, int, int)\
266  = (void *)checkasm_checked_call;
267 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
268 #define call_new(...) (checkasm_set_signal_handler_state(1),\
269  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
270  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
271  checked_call(func_new, 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
272  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
273  checkasm_set_signal_handler_state(0)
274 #elif ARCH_RISCV
275 void checkasm_set_function(void *);
276 void *checkasm_get_wrapper(void);
277 
278 #if HAVE_RV && (__riscv_xlen == 64) && defined (__riscv_d)
279 #define declare_new(ret, ...) \
280  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
281 #define call_new(...) \
282  (checkasm_set_signal_handler_state(1),\
283  checkasm_set_function(func_new), checked_call(__VA_ARGS__));\
284  checkasm_set_signal_handler_state(0)
285 #else
286 #define declare_new(ret, ...)
287 #define call_new(...)\
288  (checkasm_set_signal_handler_state(1),\
289  ((func_type *)func_new)(__VA_ARGS__));\
290  checkasm_set_signal_handler_state(0)
291 #endif
292 #else
293 #define declare_new(ret, ...)
294 #define declare_new_float(ret, ...)
295 #define declare_new_emms(cpu_flags, ret, ...)
296 /* Call the function */
297 #define call_new(...)\
298  (checkasm_set_signal_handler_state(1),\
299  ((func_type *)func_new)(__VA_ARGS__));\
300  checkasm_set_signal_handler_state(0)
301 #endif
302 
303 #ifndef declare_new_emms
304 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
305 #endif
306 #ifndef declare_new_float
307 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
308 #endif
309 
310 typedef struct CheckasmPerf {
311  int sysfd;
312  uint64_t cycles;
313  int iterations;
314 } CheckasmPerf;
315 
316 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
317 
318 #if CONFIG_LINUX_PERF
319 #define PERF_START(t) do { \
320  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
321  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
322 } while (0)
323 #define PERF_STOP(t) do { \
324  int ret; \
325  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
326  ret = read(sysfd, &t, sizeof(t)); \
327  (void)ret; \
328 } while (0)
329 #elif CONFIG_MACOS_KPERF
330 #define PERF_START(t) t = ff_kperf_cycles()
331 #define PERF_STOP(t) t = ff_kperf_cycles() - t
332 #else
333 #define PERF_START(t) t = AV_READ_TIME()
334 #define PERF_STOP(t) t = AV_READ_TIME() - t
335 #endif
336 
337 /* Benchmark the function */
338 #define bench_new(...)\
339  do {\
340  if (checkasm_bench_func()) {\
341  struct CheckasmPerf *perf = checkasm_get_perf_context();\
342  av_unused const int sysfd = perf->sysfd;\
343  func_type *tfunc = func_new;\
344  uint64_t tsum = 0;\
345  uint64_t ti, tcount = 0;\
346  uint64_t t = 0; \
347  const uint64_t truns = bench_runs;\
348  checkasm_set_signal_handler_state(1);\
349  for (ti = 0; ti < truns; ti++) {\
350  PERF_START(t);\
351  tfunc(__VA_ARGS__);\
352  tfunc(__VA_ARGS__);\
353  tfunc(__VA_ARGS__);\
354  tfunc(__VA_ARGS__);\
355  PERF_STOP(t);\
356  if (t*tcount <= tsum*4 && ti > 0) {\
357  tsum += t;\
358  tcount++;\
359  }\
360  }\
361  emms_c();\
362  perf->cycles += t;\
363  perf->iterations++;\
364  checkasm_set_signal_handler_state(0);\
365  }\
366  } while (0)
367 #else
368 #define bench_new(...) while(0)
369 #define PERF_START(t) while(0)
370 #define PERF_STOP(t) while(0)
371 #endif
372 
373 #define DECL_CHECKASM_CHECK_FUNC(type) \
374 int checkasm_check_##type(const char *file, int line, \
375  const type *buf1, ptrdiff_t stride1, \
376  const type *buf2, ptrdiff_t stride2, \
377  int w, int h, const char *name)
378 
379 DECL_CHECKASM_CHECK_FUNC(uint8_t);
380 DECL_CHECKASM_CHECK_FUNC(uint16_t);
381 DECL_CHECKASM_CHECK_FUNC(uint32_t);
382 DECL_CHECKASM_CHECK_FUNC(int16_t);
383 DECL_CHECKASM_CHECK_FUNC(int32_t);
384 
385 #define PASTE(a,b) a ## b
386 #define CONCAT(a,b) PASTE(a,b)
387 
388 #define checkasm_check(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
389 
390 #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:406
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:510
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:81
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:365
checkasm_bench_func
void int checkasm_bench_func(void)
Definition: checkasm.c:1069
b
#define b
Definition: input.c:41
func_ref
static av_unused void * func_ref
Definition: checkasm.h:174
checkasm_check_aacpsdsp
void checkasm_check_aacpsdsp(void)
Definition: aacpsdsp.c:234
checkasm_check_func
void * checkasm_check_func(void *func, const char *name,...) av_printf_format(2
CheckasmPerf::sysfd
int sysfd
Definition: checkasm.h:311
checkasm_check_alacdsp
void checkasm_check_alacdsp(void)
Definition: alacdsp.c:116
checkasm_check_llviddspenc
void checkasm_check_llviddspenc(void)
Definition: llviddspenc.c:104
double_near_abs_eps
int double_near_abs_eps(double a, double b, double eps)
Definition: checkasm.c:484
checkasm_check_h264dsp
void checkasm_check_h264dsp(void)
Definition: h264dsp.c:452
checkasm_check_ac3dsp
void checkasm_check_ac3dsp(void)
Definition: ac3dsp.c:193
checkasm_check_motion
void checkasm_check_motion(void)
Definition: motion.c:137
func_new
static av_unused void * func_new
Definition: checkasm.h:174
checkasm_check_h263dsp
void checkasm_check_h263dsp(void)
Definition: h263dsp.c:54
float_near_abs_eps_ulp
int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp)
Definition: checkasm.c:467
CheckasmPerf
Definition: checkasm.h:310
dummy
int dummy
Definition: motion.c:66
checkasm_check_vp9dsp
void checkasm_check_vp9dsp(void)
Definition: vp9dsp.c:627
checkasm_check_vf_threshold
void checkasm_check_vf_threshold(void)
Definition: vf_threshold.c:79
checkasm_check_vf_gblur
void checkasm_check_vf_gblur(void)
Definition: vf_gblur.c:82
checkasm_check_vvc_mc
void checkasm_check_vvc_mc(void)
Definition: vvc_mc.c:471
checkasm_check_sw_yuv2rgb
void checkasm_check_sw_yuv2rgb(void)
Definition: sw_yuv2rgb.c:233
checkasm_report
void checkasm_report(const char *name,...) av_printf_format(1
checkasm_check_float_dsp
void checkasm_check_float_dsp(void)
Definition: float_dsp.c:297
double_near_abs_eps_array
int double_near_abs_eps_array(const double *a, const double *b, double eps, unsigned len)
Definition: checkasm.c:491
checkasm_check_pixblockdsp
void checkasm_check_pixblockdsp(void)
Definition: pixblockdsp.c:82
checkasm_check_bswapdsp
void checkasm_check_bswapdsp(void)
Definition: bswapdsp.c:60
s
#define s(width, name)
Definition: cbs_vp9.c:198
checkasm_check_vf_bwdif
void checkasm_check_vf_bwdif(void)
Definition: vf_bwdif.c:72
lfg.h
checkasm_check_sw_rgb
void checkasm_check_sw_rgb(void)
Definition: sw_rgb.c:451
checkasm_check_hevc_sao
void checkasm_check_hevc_sao(void)
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checkasm_check_hevc_pel
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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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