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_h264chroma(void);
95 void checkasm_check_h264dsp(void);
96 void checkasm_check_h264pred(void);
97 void checkasm_check_h264qpel(void);
98 void checkasm_check_hevc_add_res(void);
99 void checkasm_check_hevc_deblock(void);
100 void checkasm_check_hevc_idct(void);
101 void checkasm_check_hevc_pel(void);
102 void checkasm_check_hevc_sao(void);
103 void checkasm_check_huffyuvdsp(void);
104 void checkasm_check_idctdsp(void);
105 void checkasm_check_jpeg2000dsp(void);
106 void checkasm_check_llauddsp(void);
107 void checkasm_check_llviddsp(void);
108 void checkasm_check_llviddspenc(void);
109 void checkasm_check_lpc(void);
110 void checkasm_check_motion(void);
111 void checkasm_check_nlmeans(void);
112 void checkasm_check_opusdsp(void);
113 void checkasm_check_pixblockdsp(void);
114 void checkasm_check_sbrdsp(void);
115 void checkasm_check_rv34dsp(void);
116 void checkasm_check_rv40dsp(void);
117 void checkasm_check_svq1enc(void);
118 void checkasm_check_synth_filter(void);
119 void checkasm_check_sw_gbrp(void);
120 void checkasm_check_sw_rgb(void);
121 void checkasm_check_sw_scale(void);
122 void checkasm_check_takdsp(void);
123 void checkasm_check_utvideodsp(void);
124 void checkasm_check_v210dec(void);
125 void checkasm_check_v210enc(void);
126 void checkasm_check_vc1dsp(void);
127 void checkasm_check_vf_bwdif(void);
128 void checkasm_check_vf_eq(void);
129 void checkasm_check_vf_gblur(void);
130 void checkasm_check_vf_hflip(void);
131 void checkasm_check_vf_threshold(void);
132 void checkasm_check_vf_sobel(void);
133 void checkasm_check_vp8dsp(void);
134 void checkasm_check_vp9dsp(void);
135 void checkasm_check_videodsp(void);
136 void checkasm_check_vorbisdsp(void);
137 void checkasm_check_vvc_alf(void);
138 void checkasm_check_vvc_mc(void);
139 
140 struct CheckasmPerf;
141 
142 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
143 int checkasm_bench_func(void);
144 void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
145 struct CheckasmPerf *checkasm_get_perf_context(void);
146 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
147 void checkasm_set_signal_handler_state(int enabled);
148 int checkasm_handle_signal(int s);
149 extern checkasm_context checkasm_context_buf;
150 
151 /* float compare utilities */
152 int float_near_ulp(float a, float b, unsigned max_ulp);
153 int float_near_abs_eps(float a, float b, float eps);
154 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
155 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
156  unsigned len);
157 int float_near_abs_eps_array(const float *a, const float *b, float eps,
158  unsigned len);
159 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
160  unsigned max_ulp, unsigned len);
161 int double_near_abs_eps(double a, double b, double eps);
162 int double_near_abs_eps_array(const double *a, const double *b, double eps,
163  unsigned len);
164 
165 extern AVLFG checkasm_lfg;
166 #define rnd() av_lfg_get(&checkasm_lfg)
167 
168 static av_unused void *func_ref, *func_new;
169 
170 #define BENCH_RUNS 1000 /* Trade-off between accuracy and speed */
171 
172 /* Decide whether or not the specified function needs to be tested */
173 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
174 
175 /* Declare the function prototype. The first argument is the return value, the remaining
176  * arguments are the function parameters. Naming parameters is optional. */
177 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
178 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
179 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
180 
181 /* Indicate that the current test has failed */
182 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
183 
184 /* Print the test outcome */
185 #define report checkasm_report
186 
187 /* Call the reference function */
188 #define call_ref(...)\
189  (checkasm_set_signal_handler_state(1),\
190  ((func_type *)func_ref)(__VA_ARGS__));\
191  checkasm_set_signal_handler_state(0)
192 
193 #if ARCH_X86 && HAVE_X86ASM
194 /* Verifies that clobbered callee-saved registers are properly saved and restored
195  * and that either no MMX registers are touched or emms is issued */
196 void checkasm_checked_call(void *func, ...);
197 /* Verifies that clobbered callee-saved registers are properly saved and restored
198  * and issues emms for asm functions which are not required to do so */
199 void checkasm_checked_call_emms(void *func, ...);
200 /* Verifies that clobbered callee-saved registers are properly saved and restored
201  * but doesn't issue emms. Meant for dsp functions returning float or double */
202 void checkasm_checked_call_float(void *func, ...);
203 
204 #if ARCH_X86_64
205 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
206  * This is done by clobbering the stack with junk around the stack pointer and calling the
207  * assembly function through checked_call() with added dummy arguments which forces all
208  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
209  * upper half of the 64-bit register locations on the stack will now contain junk which will
210  * cause misbehaving functions to either produce incorrect output or segfault. Note that
211  * even though this works extremely well in practice, it's technically not guaranteed
212  * and false negatives is theoretically possible, but there can never be any false positives.
213  */
214 void checkasm_stack_clobber(uint64_t clobber, ...);
215 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
216  = (void *)checkasm_checked_call;
217 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
218  = (void *)checkasm_checked_call_float;
219 #define declare_new_emms(cpu_flags, ret, ...) \
220  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
221  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
222  (void *)checkasm_checked_call;
223 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
224 #define call_new(...) (checkasm_set_signal_handler_state(1),\
225  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
226  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
227  checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__));\
228  checkasm_set_signal_handler_state(0)
229 #elif ARCH_X86_32
230 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
231 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
232 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
233  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
234  (void *)checkasm_checked_call;
235 #define call_new(...)\
236  (checkasm_set_signal_handler_state(1),\
237  checked_call(func_new, __VA_ARGS__));\
238  checkasm_set_signal_handler_state(0)
239 #endif
240 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
241 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
242  * This makes sure that potential 8-byte-alignment of parameters is kept the same
243  * even when the extra parameters have been removed. */
244 void checkasm_checked_call_vfp(void *func, int dummy, ...);
245 void checkasm_checked_call_novfp(void *func, int dummy, ...);
246 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
247 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
248  int, int, int, int, int, int, int, int, \
249  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
250 #define call_new(...) \
251  (checkasm_set_signal_handler_state(1),\
252  checked_call(func_new, 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
253  checkasm_set_signal_handler_state(0)
254 #elif ARCH_AARCH64 && !defined(__APPLE__)
255 void checkasm_stack_clobber(uint64_t clobber, ...);
256 void checkasm_checked_call(void *func, ...);
257 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
258  int, int, int, int, int, int, int, int,\
259  int, int, int, int, int, int, int)\
260  = (void *)checkasm_checked_call;
261 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
262 #define call_new(...) (checkasm_set_signal_handler_state(1),\
263  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
264  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
265  checked_call(func_new, 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
266  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
267  checkasm_set_signal_handler_state(0)
268 #elif ARCH_RISCV
269 void checkasm_set_function(void *);
270 void *checkasm_get_wrapper(void);
271 
272 #if HAVE_RV && (__riscv_xlen == 64) && defined (__riscv_d)
273 #define declare_new(ret, ...) \
274  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
275 #define call_new(...) \
276  (checkasm_set_signal_handler_state(1),\
277  checkasm_set_function(func_new), checked_call(__VA_ARGS__));\
278  checkasm_set_signal_handler_state(0)
279 #else
280 #define declare_new(ret, ...)
281 #define call_new(...)\
282  (checkasm_set_signal_handler_state(1),\
283  ((func_type *)func_new)(__VA_ARGS__));\
284  checkasm_set_signal_handler_state(0)
285 #endif
286 #else
287 #define declare_new(ret, ...)
288 #define declare_new_float(ret, ...)
289 #define declare_new_emms(cpu_flags, ret, ...)
290 /* Call the function */
291 #define call_new(...)\
292  (checkasm_set_signal_handler_state(1),\
293  ((func_type *)func_new)(__VA_ARGS__));\
294  checkasm_set_signal_handler_state(0)
295 #endif
296 
297 #ifndef declare_new_emms
298 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
299 #endif
300 #ifndef declare_new_float
301 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
302 #endif
303 
304 typedef struct CheckasmPerf {
305  int sysfd;
306  uint64_t cycles;
307  int iterations;
308 } CheckasmPerf;
309 
310 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
311 
312 #if CONFIG_LINUX_PERF
313 #define PERF_START(t) do { \
314  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
315  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
316 } while (0)
317 #define PERF_STOP(t) do { \
318  int ret; \
319  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
320  ret = read(sysfd, &t, sizeof(t)); \
321  (void)ret; \
322 } while (0)
323 #elif CONFIG_MACOS_KPERF
324 #define PERF_START(t) t = ff_kperf_cycles()
325 #define PERF_STOP(t) t = ff_kperf_cycles() - t
326 #else
327 #define PERF_START(t) t = AV_READ_TIME()
328 #define PERF_STOP(t) t = AV_READ_TIME() - t
329 #endif
330 
331 /* Benchmark the function */
332 #define bench_new(...)\
333  do {\
334  if (checkasm_bench_func()) {\
335  struct CheckasmPerf *perf = checkasm_get_perf_context();\
336  av_unused const int sysfd = perf->sysfd;\
337  func_type *tfunc = func_new;\
338  uint64_t tsum = 0;\
339  int ti, tcount = 0;\
340  uint64_t t = 0; \
341  checkasm_set_signal_handler_state(1);\
342  for (ti = 0; ti < BENCH_RUNS; ti++) {\
343  PERF_START(t);\
344  tfunc(__VA_ARGS__);\
345  tfunc(__VA_ARGS__);\
346  tfunc(__VA_ARGS__);\
347  tfunc(__VA_ARGS__);\
348  PERF_STOP(t);\
349  if (t*tcount <= tsum*4 && ti > 0) {\
350  tsum += t;\
351  tcount++;\
352  }\
353  }\
354  emms_c();\
355  perf->cycles += t;\
356  perf->iterations++;\
357  checkasm_set_signal_handler_state(0);\
358  }\
359  } while (0)
360 #else
361 #define bench_new(...) while(0)
362 #define PERF_START(t) while(0)
363 #define PERF_STOP(t) while(0)
364 #endif
365 
366 #define DECL_CHECKASM_CHECK_FUNC(type) \
367 int checkasm_check_##type(const char *file, int line, \
368  const type *buf1, ptrdiff_t stride1, \
369  const type *buf2, ptrdiff_t stride2, \
370  int w, int h, const char *name)
371 
372 DECL_CHECKASM_CHECK_FUNC(uint8_t);
373 DECL_CHECKASM_CHECK_FUNC(uint16_t);
374 DECL_CHECKASM_CHECK_FUNC(uint32_t);
375 DECL_CHECKASM_CHECK_FUNC(int16_t);
376 DECL_CHECKASM_CHECK_FUNC(int32_t);
377 
378 #define PASTE(a,b) a ## b
379 #define CONCAT(a,b) PASTE(a,b)
380 
381 #define checkasm_check(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
382 
383 #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:358
checkasm_check_sw_gbrp
void checkasm_check_sw_gbrp(void)
Definition: sw_gbrp.c:401
checkasm_check_vp8dsp
void checkasm_check_vp8dsp(void)
Definition: vp8dsp.c:507
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_aacencdsp
void checkasm_check_aacencdsp(void)
Definition: aacencdsp.c:64
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:362
checkasm_bench_func
void int checkasm_bench_func(void)
Definition: checkasm.c:949
b
#define b
Definition: input.c:41
func_ref
static av_unused void * func_ref
Definition: checkasm.h:168
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:305
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:436
checkasm_check_h264dsp
void checkasm_check_h264dsp(void)
Definition: h264dsp.c:443
checkasm_check_ac3dsp
void checkasm_check_ac3dsp(void)
Definition: ac3dsp.c:193
checkasm_check_motion
void checkasm_check_motion(void)
Definition: motion.c:146
func_new
static av_unused void * func_new
Definition: checkasm.h:168
float_near_abs_eps_ulp
int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp)
Definition: checkasm.c:419
CheckasmPerf
Definition: checkasm.h:304
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:325
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:281
double_near_abs_eps_array
int double_near_abs_eps_array(const double *a, const double *b, double eps, unsigned len)
Definition: checkasm.c:443
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:182
checkasm_check_hevc_sao
void checkasm_check_hevc_sao(void)
Definition: hevc_sao.c:141
checkasm_check_hevc_pel
void checkasm_check_hevc_pel(void)
Definition: hevc_pel.c:607
CheckasmPerf::iterations
int iterations
Definition: checkasm.h:307
checkasm_check_takdsp
void checkasm_check_takdsp(void)
Definition: takdsp.c:145
checkasm_check_fmtconvert
void checkasm_check_fmtconvert(void)
Definition: fmtconvert.c:46
checkasm_set_signal_handler_state
void void checkasm_set_signal_handler_state(int enabled)
Definition: checkasm.c:975
macos_kperf.h
float_near_abs_eps_array
int float_near_abs_eps_array(const float *a, const float *b, float eps, unsigned len)
Definition: checkasm.c:407
av_printf_format
#define av_printf_format(fmtpos, attrpos)
Definition: attributes.h:161
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checkasm_check_rv40dsp
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Definition: rv40dsp.c:71
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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AVLFG
Context structure for the Lagged Fibonacci PRNG.
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Definition: llauddsp.c:108
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Definition: h264pred.c:233
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
Definition: undefined.txt:41
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Definition: utvideodsp.c:90
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checkasm_check_flacdsp
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Definition: synth_filter.c:47
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CONTEXT
#define CONTEXT
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len
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int32_t
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Definition: rv34dsp.c:82
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Definition: vvc_alf.c:165
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Definition: exrdsp.c:77
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