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_nlmeans(void);
114 void checkasm_check_opusdsp(void);
115 void checkasm_check_pixblockdsp(void);
116 void checkasm_check_sbrdsp(void);
117 void checkasm_check_rv34dsp(void);
118 void checkasm_check_rv40dsp(void);
119 void checkasm_check_svq1enc(void);
120 void checkasm_check_synth_filter(void);
121 void checkasm_check_sw_gbrp(void);
122 void checkasm_check_sw_range_convert(void);
123 void checkasm_check_sw_rgb(void);
124 void checkasm_check_sw_scale(void);
125 void checkasm_check_takdsp(void);
126 void checkasm_check_utvideodsp(void);
127 void checkasm_check_v210dec(void);
128 void checkasm_check_v210enc(void);
129 void checkasm_check_vc1dsp(void);
130 void checkasm_check_vf_bwdif(void);
131 void checkasm_check_vf_eq(void);
132 void checkasm_check_vf_gblur(void);
133 void checkasm_check_vf_hflip(void);
134 void checkasm_check_vf_threshold(void);
135 void checkasm_check_vf_sobel(void);
136 void checkasm_check_vp8dsp(void);
137 void checkasm_check_vp9dsp(void);
138 void checkasm_check_videodsp(void);
139 void checkasm_check_vorbisdsp(void);
140 void checkasm_check_vvc_alf(void);
141 void checkasm_check_vvc_mc(void);
142 
143 struct CheckasmPerf;
144 
145 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
146 int checkasm_bench_func(void);
147 void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
148 struct CheckasmPerf *checkasm_get_perf_context(void);
149 void checkasm_report(const char *name, ...) av_printf_format(1, 2);
150 void checkasm_set_signal_handler_state(int enabled);
151 int checkasm_handle_signal(int s);
152 extern checkasm_context checkasm_context_buf;
153 
154 /* float compare utilities */
155 int float_near_ulp(float a, float b, unsigned max_ulp);
156 int float_near_abs_eps(float a, float b, float eps);
157 int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
158 int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
159  unsigned len);
160 int float_near_abs_eps_array(const float *a, const float *b, float eps,
161  unsigned len);
162 int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
163  unsigned max_ulp, unsigned len);
164 int double_near_abs_eps(double a, double b, double eps);
165 int double_near_abs_eps_array(const double *a, const double *b, double eps,
166  unsigned len);
167 
168 extern AVLFG checkasm_lfg;
169 #define rnd() av_lfg_get(&checkasm_lfg)
170 
171 static av_unused void *func_ref, *func_new;
172 
173 extern uint64_t bench_runs;
174 
175 /* Decide whether or not the specified function needs to be tested */
176 #define check_func(func, ...) (checkasm_save_context(), func_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
177 
178 /* Declare the function prototype. The first argument is the return value, the remaining
179  * arguments are the function parameters. Naming parameters is optional. */
180 #define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
181 #define declare_func_float(ret, ...) declare_new_float(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
182 #define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
183 
184 /* Indicate that the current test has failed */
185 #define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
186 
187 /* Print the test outcome */
188 #define report checkasm_report
189 
190 /* Call the reference function */
191 #define call_ref(...)\
192  (checkasm_set_signal_handler_state(1),\
193  ((func_type *)func_ref)(__VA_ARGS__));\
194  checkasm_set_signal_handler_state(0)
195 
196 #if ARCH_X86 && HAVE_X86ASM
197 /* Verifies that clobbered callee-saved registers are properly saved and restored
198  * and that either no MMX registers are touched or emms is issued */
199 void checkasm_checked_call(void *func, ...);
200 /* Verifies that clobbered callee-saved registers are properly saved and restored
201  * and issues emms for asm functions which are not required to do so */
202 void checkasm_checked_call_emms(void *func, ...);
203 /* Verifies that clobbered callee-saved registers are properly saved and restored
204  * but doesn't issue emms. Meant for dsp functions returning float or double */
205 void checkasm_checked_call_float(void *func, ...);
206 
207 #if ARCH_X86_64
208 /* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
209  * This is done by clobbering the stack with junk around the stack pointer and calling the
210  * assembly function through checked_call() with added dummy arguments which forces all
211  * real arguments to be passed on the stack and not in registers. For 32-bit arguments the
212  * upper half of the 64-bit register locations on the stack will now contain junk which will
213  * cause misbehaving functions to either produce incorrect output or segfault. Note that
214  * even though this works extremely well in practice, it's technically not guaranteed
215  * and false negatives is theoretically possible, but there can never be any false positives.
216  */
217 void checkasm_stack_clobber(uint64_t clobber, ...);
218 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
219  = (void *)checkasm_checked_call;
220 #define declare_new_float(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
221  = (void *)checkasm_checked_call_float;
222 #define declare_new_emms(cpu_flags, ret, ...) \
223  ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
224  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
225  (void *)checkasm_checked_call;
226 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
227 #define call_new(...) (checkasm_set_signal_handler_state(1),\
228  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
229  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
230  checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__));\
231  checkasm_set_signal_handler_state(0)
232 #elif ARCH_X86_32
233 #define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
234 #define declare_new_float(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call_float;
235 #define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
236  ((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
237  (void *)checkasm_checked_call;
238 #define call_new(...)\
239  (checkasm_set_signal_handler_state(1),\
240  checked_call(func_new, __VA_ARGS__));\
241  checkasm_set_signal_handler_state(0)
242 #endif
243 #elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
244 /* Use a dummy argument, to offset the real parameters by 2, not only 1.
245  * This makes sure that potential 8-byte-alignment of parameters is kept the same
246  * even when the extra parameters have been removed. */
247 void checkasm_checked_call_vfp(void *func, int dummy, ...);
248 void checkasm_checked_call_novfp(void *func, int dummy, ...);
249 extern void (*checkasm_checked_call)(void *func, int dummy, ...);
250 #define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__, \
251  int, int, int, int, int, int, int, int, \
252  int, int, int, int, int, int, int) = (void *)checkasm_checked_call;
253 #define call_new(...) \
254  (checkasm_set_signal_handler_state(1),\
255  checked_call(func_new, 0, __VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0));\
256  checkasm_set_signal_handler_state(0)
257 #elif ARCH_AARCH64 && !defined(__APPLE__)
258 void checkasm_stack_clobber(uint64_t clobber, ...);
259 void checkasm_checked_call(void *func, ...);
260 #define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__,\
261  int, int, int, int, int, int, int, int,\
262  int, int, int, int, int, int, int)\
263  = (void *)checkasm_checked_call;
264 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
265 #define call_new(...) (checkasm_set_signal_handler_state(1),\
266  checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
267  CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
268  checked_call(func_new, 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__,\
269  7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0));\
270  checkasm_set_signal_handler_state(0)
271 #elif ARCH_RISCV
272 void checkasm_set_function(void *);
273 void *checkasm_get_wrapper(void);
274 
275 #if HAVE_RV && (__riscv_xlen == 64) && defined (__riscv_d)
276 #define declare_new(ret, ...) \
277  ret (*checked_call)(__VA_ARGS__) = checkasm_get_wrapper();
278 #define call_new(...) \
279  (checkasm_set_signal_handler_state(1),\
280  checkasm_set_function(func_new), checked_call(__VA_ARGS__));\
281  checkasm_set_signal_handler_state(0)
282 #else
283 #define declare_new(ret, ...)
284 #define call_new(...)\
285  (checkasm_set_signal_handler_state(1),\
286  ((func_type *)func_new)(__VA_ARGS__));\
287  checkasm_set_signal_handler_state(0)
288 #endif
289 #else
290 #define declare_new(ret, ...)
291 #define declare_new_float(ret, ...)
292 #define declare_new_emms(cpu_flags, ret, ...)
293 /* Call the function */
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 
300 #ifndef declare_new_emms
301 #define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __VA_ARGS__)
302 #endif
303 #ifndef declare_new_float
304 #define declare_new_float(ret, ...) declare_new(ret, __VA_ARGS__)
305 #endif
306 
307 typedef struct CheckasmPerf {
308  int sysfd;
309  uint64_t cycles;
310  int iterations;
311 } CheckasmPerf;
312 
313 #if defined(AV_READ_TIME) || CONFIG_LINUX_PERF || CONFIG_MACOS_KPERF
314 
315 #if CONFIG_LINUX_PERF
316 #define PERF_START(t) do { \
317  ioctl(sysfd, PERF_EVENT_IOC_RESET, 0); \
318  ioctl(sysfd, PERF_EVENT_IOC_ENABLE, 0); \
319 } while (0)
320 #define PERF_STOP(t) do { \
321  int ret; \
322  ioctl(sysfd, PERF_EVENT_IOC_DISABLE, 0); \
323  ret = read(sysfd, &t, sizeof(t)); \
324  (void)ret; \
325 } while (0)
326 #elif CONFIG_MACOS_KPERF
327 #define PERF_START(t) t = ff_kperf_cycles()
328 #define PERF_STOP(t) t = ff_kperf_cycles() - t
329 #else
330 #define PERF_START(t) t = AV_READ_TIME()
331 #define PERF_STOP(t) t = AV_READ_TIME() - t
332 #endif
333 
334 /* Benchmark the function */
335 #define bench_new(...)\
336  do {\
337  if (checkasm_bench_func()) {\
338  struct CheckasmPerf *perf = checkasm_get_perf_context();\
339  av_unused const int sysfd = perf->sysfd;\
340  func_type *tfunc = func_new;\
341  uint64_t tsum = 0;\
342  uint64_t ti, tcount = 0;\
343  uint64_t t = 0; \
344  const uint64_t truns = bench_runs;\
345  checkasm_set_signal_handler_state(1);\
346  for (ti = 0; ti < truns; ti++) {\
347  PERF_START(t);\
348  tfunc(__VA_ARGS__);\
349  tfunc(__VA_ARGS__);\
350  tfunc(__VA_ARGS__);\
351  tfunc(__VA_ARGS__);\
352  PERF_STOP(t);\
353  if (t*tcount <= tsum*4 && ti > 0) {\
354  tsum += t;\
355  tcount++;\
356  }\
357  }\
358  emms_c();\
359  perf->cycles += t;\
360  perf->iterations++;\
361  checkasm_set_signal_handler_state(0);\
362  }\
363  } while (0)
364 #else
365 #define bench_new(...) while(0)
366 #define PERF_START(t) while(0)
367 #define PERF_STOP(t) while(0)
368 #endif
369 
370 #define DECL_CHECKASM_CHECK_FUNC(type) \
371 int checkasm_check_##type(const char *file, int line, \
372  const type *buf1, ptrdiff_t stride1, \
373  const type *buf2, ptrdiff_t stride2, \
374  int w, int h, const char *name)
375 
376 DECL_CHECKASM_CHECK_FUNC(uint8_t);
377 DECL_CHECKASM_CHECK_FUNC(uint16_t);
378 DECL_CHECKASM_CHECK_FUNC(uint32_t);
379 DECL_CHECKASM_CHECK_FUNC(int16_t);
380 DECL_CHECKASM_CHECK_FUNC(int32_t);
381 
382 #define PASTE(a,b) a ## b
383 #define CONCAT(a,b) PASTE(a,b)
384 
385 #define checkasm_check(prefix, ...) CONCAT(checkasm_check_, prefix)(__FILE__, __LINE__, __VA_ARGS__)
386 
387 #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:370
checkasm_check_sw_gbrp
void checkasm_check_sw_gbrp(void)
Definition: sw_gbrp.c:403
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_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:362
checkasm_bench_func
void int checkasm_bench_func(void)
Definition: checkasm.c:978
b
#define b
Definition: input.c:41
func_ref
static av_unused void * func_ref
Definition: checkasm.h:171
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:308
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:448
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:171
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:431
CheckasmPerf
Definition: checkasm.h:307
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:364
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:455
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:291
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:310
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
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Definition: checkasm.c:1004
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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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Context structure for the Lagged Fibonacci PRNG.
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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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