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_afir(void);
84 void checkasm_check_alacdsp(void);
85 void checkasm_check_audiodsp(void);
86 void checkasm_check_av_tx(void);
87 void checkasm_check_blend(void);
88 void checkasm_check_blockdsp(void);
89 void checkasm_check_bswapdsp(void);
90 void checkasm_check_colorspace(void);
91 void checkasm_check_diracdsp(void);
92 void checkasm_check_exrdsp(void);
93 void checkasm_check_fdctdsp(void);
94 void checkasm_check_fixed_dsp(void);
95 void checkasm_check_flacdsp(void);
96 void checkasm_check_float_dsp(void);
97 void checkasm_check_fmtconvert(void);
98 void checkasm_check_g722dsp(void);
99 void checkasm_check_h263dsp(void);
100 void checkasm_check_h264chroma(void);
101 void checkasm_check_h264dsp(void);
102 void checkasm_check_h264pred(void);
103 void checkasm_check_h264qpel(void);
104 void checkasm_check_hevc_add_res(void);
105 void checkasm_check_hevc_deblock(void);
106 void checkasm_check_hevc_idct(void);
107 void checkasm_check_hevc_pel(void);
108 void checkasm_check_hevc_sao(void);
109 void checkasm_check_huffyuvdsp(void);
110 void checkasm_check_idctdsp(void);
111 void checkasm_check_jpeg2000dsp(void);
112 void checkasm_check_llauddsp(void);
113 void checkasm_check_lls(void);
114 void checkasm_check_llviddsp(void);
115 void checkasm_check_llviddspenc(void);
116 void checkasm_check_lpc(void);
117 void checkasm_check_motion(void);
118 void checkasm_check_mpegvideoencdsp(void);
119 void checkasm_check_nlmeans(void);
120 void checkasm_check_opusdsp(void);
121 void checkasm_check_pixblockdsp(void);
122 void checkasm_check_sbrdsp(void);
123 void checkasm_check_rv34dsp(void);
124 void checkasm_check_rv40dsp(void);
125 void checkasm_check_svq1enc(void);
126 void checkasm_check_synth_filter(void);
127 void checkasm_check_sw_gbrp(void);
128 void checkasm_check_sw_range_convert(void);
129 void checkasm_check_sw_rgb(void);
130 void checkasm_check_sw_scale(void);
131 void checkasm_check_sw_yuv2rgb(void);
132 void checkasm_check_sw_yuv2yuv(void);
133 void checkasm_check_takdsp(void);
134 void checkasm_check_utvideodsp(void);
135 void checkasm_check_v210dec(void);
136 void checkasm_check_v210enc(void);
137 void checkasm_check_vc1dsp(void);
138 void checkasm_check_vf_bwdif(void);
139 void checkasm_check_vf_eq(void);
140 void checkasm_check_vf_gblur(void);
141 void checkasm_check_vf_hflip(void);
142 void checkasm_check_vf_threshold(void);
143 void checkasm_check_vf_sobel(void);
144 void checkasm_check_vp8dsp(void);
145 void checkasm_check_vp9dsp(void);
146 void checkasm_check_videodsp(void);
147 void checkasm_check_vorbisdsp(void);
148 void checkasm_check_vvc_alf(void);
149 void checkasm_check_vvc_mc(void);
150 
151 struct CheckasmPerf;
152 
153 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
154 int checkasm_bench_func(void);
155 void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
156 struct CheckasmPerf *checkasm_get_perf_context(void);
157 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
158 void checkasm_set_signal_handler_state(int enabled);
159 int checkasm_handle_signal(int s);
160 extern checkasm_context checkasm_context_buf;
161 
162 /* float compare utilities */
163 int float_near_ulp(float a, float b, unsigned max_ulp);
164 int float_near_abs_eps(float a, float b, float eps);
165 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
166 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
167  unsigned len);
168 int float_near_abs_eps_array(const float *a, const float *b, float eps,
169  unsigned len);
170 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
171  unsigned max_ulp, unsigned len);
172 int double_near_abs_eps(double a, double b, double eps);
173 int double_near_abs_eps_array(const double *a, const double *b, double eps,
174  unsigned len);
175 
176 extern AVLFG checkasm_lfg;
177 #define rnd() av_lfg_get(&checkasm_lfg)
178 
179 static av_unused void *func_ref, *func_new;
180 
181 extern uint64_t bench_runs;
182 
183 /* Decide whether or not the specified function needs to be tested */
184 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
185 
186 /* Declare the function prototype. The first argument is the return value, the remaining
187  * arguments are the function parameters. Naming parameters is optional. */
188 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
189 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
190 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
191 
192 /* Indicate that the current test has failed */
193 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
194 
195 /* Print the test outcome */
196 #define report checkasm_report
197 
198 /* Call the reference function */
199 #define call_ref(...)\
200  (checkasm_set_signal_handler_state(1),\
201  ((func_type *)func_ref)(__VA_ARGS__));\
202  checkasm_set_signal_handler_state(0)
203 
204 #if ARCH_X86 && HAVE_X86ASM
205 /* Verifies that clobbered callee-saved registers are properly saved and restored
206  * and that either no MMX registers are touched or emms is issued */
207 void checkasm_checked_call(void *func, ...);
208 /* Verifies that clobbered callee-saved registers are properly saved and restored
209  * and issues emms for asm functions which are not required to do so */
210 void checkasm_checked_call_emms(void *func, ...);
211 /* Verifies that clobbered callee-saved registers are properly saved and restored
212  * but doesn't issue emms. Meant for dsp functions returning float or double */
213 void checkasm_checked_call_float(void *func, ...);
214 
215 #if ARCH_X86_64
216 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
217  * This is done by clobbering the stack with junk around the stack pointer and calling the
218  * assembly function through checked_call() with added dummy arguments which forces all
219  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
220  * upper half of the 64-bit register locations on the stack will now contain junk which will
221  * cause misbehaving functions to either produce incorrect output or segfault. Note that
222  * even though this works extremely well in practice, it's technically not guaranteed
223  * and false negatives is theoretically possible, but there can never be any false positives.
224  */
225 void checkasm_stack_clobber(uint64_t clobber, ...);
226 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
227  = (void *)checkasm_checked_call;
228 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
229  = (void *)checkasm_checked_call_float;
230 #define declare_new_emms(cpu_flags, ret, ...) \
231  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
232  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
233  (void *)checkasm_checked_call;
234 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
235 #define call_new(...) (checkasm_set_signal_handler_state(1),\
236  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
237  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
238  checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__));\
239  checkasm_set_signal_handler_state(0)
240 #elif ARCH_X86_32
241 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
242 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
243 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
244  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
245  (void *)checkasm_checked_call;
246 #define call_new(...)\
247  (checkasm_set_signal_handler_state(1),\
248  checked_call(func_new, __VA_ARGS__));\
249  checkasm_set_signal_handler_state(0)
250 #endif
251 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
252 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
253  * This makes sure that potential 8-byte-alignment of parameters is kept the same
254  * even when the extra parameters have been removed. */
255 void checkasm_checked_call_vfp(void *func, int dummy, ...);
256 void checkasm_checked_call_novfp(void *func, int dummy, ...);
257 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
258 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
259  int, int, int, int, int, int, int, int, \
260  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
261 #define call_new(...) \
262  (checkasm_set_signal_handler_state(1),\
263  checked_call(func_new, 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
264  checkasm_set_signal_handler_state(0)
265 #elif ARCH_AARCH64 && !defined(__APPLE__)
266 void checkasm_stack_clobber(uint64_t clobber, ...);
267 void checkasm_checked_call(void *func, ...);
268 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
269  int, int, int, int, int, int, int, int,\
270  int, int, int, int, int, int, int)\
271  = (void *)checkasm_checked_call;
272 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
273 #define call_new(...) (checkasm_set_signal_handler_state(1),\
274  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
275  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
276  checked_call(func_new, 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
277  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
278  checkasm_set_signal_handler_state(0)
279 #elif ARCH_RISCV
280 void checkasm_set_function(void *);
281 void *checkasm_get_wrapper(void);
282 
283 #if HAVE_RV && (__riscv_xlen == 64) && defined (__riscv_d)
284 #define declare_new(ret, ...) \
285  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
286 #define call_new(...) \
287  (checkasm_set_signal_handler_state(1),\
288  checkasm_set_function(func_new), checked_call(__VA_ARGS__));\
289  checkasm_set_signal_handler_state(0)
290 #else
291 #define declare_new(ret, ...)
292 #define call_new(...)\
293  (checkasm_set_signal_handler_state(1),\
294  ((func_type *)func_new)(__VA_ARGS__));\
295  checkasm_set_signal_handler_state(0)
296 #endif
297 #else
298 #define declare_new(ret, ...)
299 #define declare_new_float(ret, ...)
300 #define declare_new_emms(cpu_flags, ret, ...)
301 /* Call the function */
302 #define call_new(...)\
303  (checkasm_set_signal_handler_state(1),\
304  ((func_type *)func_new)(__VA_ARGS__));\
305  checkasm_set_signal_handler_state(0)
306 #endif
307 
308 #ifndef declare_new_emms
309 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
310 #endif
311 #ifndef declare_new_float
312 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
313 #endif
314 
315 typedef struct CheckasmPerf {
316  int sysfd;
317  uint64_t cycles;
318  int iterations;
319 } CheckasmPerf;
320 
321 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
322 
323 #if CONFIG_LINUX_PERF
324 #define PERF_START(t) do { \
325  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
326  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
327 } while (0)
328 #define PERF_STOP(t) do { \
329  int ret; \
330  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
331  ret = read(sysfd, &t, sizeof(t)); \
332  (void)ret; \
333 } while (0)
334 #elif CONFIG_MACOS_KPERF
335 #define PERF_START(t) t = ff_kperf_cycles()
336 #define PERF_STOP(t) t = ff_kperf_cycles() - t
337 #else
338 #define PERF_START(t) t = AV_READ_TIME()
339 #define PERF_STOP(t) t = AV_READ_TIME() - t
340 #endif
341 
342 /* Benchmark the function */
343 #define bench_new(...)\
344  do {\
345  if (checkasm_bench_func()) {\
346  struct CheckasmPerf *perf = checkasm_get_perf_context();\
347  av_unused const int sysfd = perf->sysfd;\
348  func_type *tfunc = func_new;\
349  uint64_t tsum = 0;\
350  uint64_t ti, tcount = 0;\
351  uint64_t t = 0; \
352  const uint64_t truns = bench_runs;\
353  checkasm_set_signal_handler_state(1);\
354  for (ti = 0; ti < truns; ti++) {\
355  PERF_START(t);\
356  tfunc(__VA_ARGS__);\
357  tfunc(__VA_ARGS__);\
358  tfunc(__VA_ARGS__);\
359  tfunc(__VA_ARGS__);\
360  PERF_STOP(t);\
361  if (t*tcount <= tsum*4 && ti > 0) {\
362  tsum += t;\
363  tcount++;\
364  }\
365  }\
366  emms_c();\
367  perf->cycles += t;\
368  perf->iterations++;\
369  checkasm_set_signal_handler_state(0);\
370  }\
371  } while (0)
372 #else
373 #define bench_new(...) while(0)
374 #define PERF_START(t) while(0)
375 #define PERF_STOP(t) while(0)
376 #endif
377 
378 #define DECL_CHECKASM_CHECK_FUNC(type) \
379 int checkasm_check_##type(const char *file, int line, \
380  const type *buf1, ptrdiff_t stride1, \
381  const type *buf2, ptrdiff_t stride2, \
382  int w, int h, const char *name)
383 
384 DECL_CHECKASM_CHECK_FUNC(uint8_t);
385 DECL_CHECKASM_CHECK_FUNC(uint16_t);
386 DECL_CHECKASM_CHECK_FUNC(uint32_t);
387 DECL_CHECKASM_CHECK_FUNC(int16_t);
388 DECL_CHECKASM_CHECK_FUNC(int32_t);
389 
390 #define PASTE(a,b) a ## b
391 #define CONCAT(a,b) PASTE(a,b)
392 
393 #define checkasm_check(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
394 
395 /* This assumes that there is a local variable named "bit_depth".
396  * For tests that don't have that and only operate on a single
397  * bitdepth, just call checkasm_check(uint8_t, ...) directly. */
398 #define checkasm_check_pixel(buf1, stride1, buf2, stride2, ...) \
399  ((bit_depth > 8) ? \
400  checkasm_check(uint16_t, (const uint16_t*)buf1, stride1, \
401  (const uint16_t*)buf2, stride2, \
402  __VA_ARGS__) : \
403  checkasm_check(uint8_t, (const uint8_t*) buf1, stride1, \
404  (const uint8_t*) buf2, stride2, \
405  __VA_ARGS__))
406 
407 #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:413
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:437
checkasm_bench_func
void int checkasm_bench_func(void)
Definition: checkasm.c:1078
b
#define b
Definition: input.c:41
func_ref
static av_unused void * func_ref
Definition: checkasm.h:179
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:316
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:491
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:179
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:474
CheckasmPerf
Definition: checkasm.h:315
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
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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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