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checkasm.c
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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 #include <stdarg.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include "checkasm.h"
28 #include "libavutil/common.h"
29 #include "libavutil/cpu.h"
30 #include "libavutil/random_seed.h"
31 
32 #if HAVE_IO_H
33 #include <io.h>
34 #endif
35 
36 #if HAVE_SETCONSOLETEXTATTRIBUTE
37 #include <windows.h>
38 #define COLOR_RED FOREGROUND_RED
39 #define COLOR_GREEN FOREGROUND_GREEN
40 #define COLOR_YELLOW (FOREGROUND_RED|FOREGROUND_GREEN)
41 #else
42 #define COLOR_RED 1
43 #define COLOR_GREEN 2
44 #define COLOR_YELLOW 3
45 #endif
46 
47 #if HAVE_UNISTD_H
48 #include <unistd.h>
49 #endif
50 
51 #if !HAVE_ISATTY
52 #define isatty(fd) 1
53 #endif
54 
55 /* List of tests to invoke */
56 static const struct {
57  const char *name;
58  void (*func)(void);
59 } tests[] = {
60 #if CONFIG_BSWAPDSP
61  { "bswapdsp", checkasm_check_bswapdsp },
62 #endif
63 #if CONFIG_H264PRED
64  { "h264pred", checkasm_check_h264pred },
65 #endif
66 #if CONFIG_H264QPEL
67  { "h264qpel", checkasm_check_h264qpel },
68 #endif
69  { NULL }
70 };
71 
72 /* List of cpu flags to check */
73 static const struct {
74  const char *name;
75  const char *suffix;
76  int flag;
77 } cpus[] = {
78 #if ARCH_AARCH64
79  { "ARMV8", "armv8", AV_CPU_FLAG_ARMV8 },
80  { "NEON", "neon", AV_CPU_FLAG_NEON },
81 #elif ARCH_ARM
82  { "ARMV5TE", "armv5te", AV_CPU_FLAG_ARMV5TE },
83  { "ARMV6", "armv6", AV_CPU_FLAG_ARMV6 },
84  { "ARMV6T2", "armv6t2", AV_CPU_FLAG_ARMV6T2 },
85  { "VFP", "vfp", AV_CPU_FLAG_VFP },
86  { "VFPV3", "vfp3", AV_CPU_FLAG_VFPV3 },
87  { "NEON", "neon", AV_CPU_FLAG_NEON },
88 #elif ARCH_PPC
89  { "ALTIVEC", "altivec", AV_CPU_FLAG_ALTIVEC },
90  { "VSX", "vsx", AV_CPU_FLAG_VSX },
91  { "POWER8", "power8", AV_CPU_FLAG_POWER8 },
92 #elif ARCH_X86
93  { "MMX", "mmx", AV_CPU_FLAG_MMX|AV_CPU_FLAG_CMOV },
94  { "MMXEXT", "mmxext", AV_CPU_FLAG_MMXEXT },
95  { "3DNOW", "3dnow", AV_CPU_FLAG_3DNOW },
96  { "3DNOWEXT", "3dnowext", AV_CPU_FLAG_3DNOWEXT },
97  { "SSE", "sse", AV_CPU_FLAG_SSE },
98  { "SSE2", "sse2", AV_CPU_FLAG_SSE2|AV_CPU_FLAG_SSE2SLOW },
99  { "SSE3", "sse3", AV_CPU_FLAG_SSE3|AV_CPU_FLAG_SSE3SLOW },
100  { "SSSE3", "ssse3", AV_CPU_FLAG_SSSE3|AV_CPU_FLAG_ATOM },
101  { "SSE4.1", "sse4", AV_CPU_FLAG_SSE4 },
102  { "SSE4.2", "sse42", AV_CPU_FLAG_SSE42 },
103  { "AVX", "avx", AV_CPU_FLAG_AVX },
104  { "XOP", "xop", AV_CPU_FLAG_XOP },
105  { "FMA3", "fma3", AV_CPU_FLAG_FMA3 },
106  { "FMA4", "fma4", AV_CPU_FLAG_FMA4 },
107  { "AVX2", "avx2", AV_CPU_FLAG_AVX2 },
108 #endif
109  { NULL }
110 };
111 
112 typedef struct CheckasmFuncVersion {
114  void *func;
115  int ok;
116  int cpu;
118  uint64_t cycles;
120 
121 /* Binary search tree node */
122 typedef struct CheckasmFunc {
123  struct CheckasmFunc *child[2];
125  char name[1];
126 } CheckasmFunc;
127 
128 /* Internal state */
129 static struct {
133  const char *current_test_name;
134  const char *bench_pattern;
138  int nop_time;
139  int cpu_flag;
140  const char *cpu_flag_name;
141 } state;
142 
143 /* PRNG state */
145 
146 /* Print colored text to stderr if the terminal supports it */
147 static void color_printf(int color, const char *fmt, ...)
148 {
149  static int use_color = -1;
150  va_list arg;
151 
152 #if HAVE_SETCONSOLETEXTATTRIBUTE
153  static HANDLE con;
154  static WORD org_attributes;
155 
156  if (use_color < 0) {
157  CONSOLE_SCREEN_BUFFER_INFO con_info;
158  con = GetStdHandle(STD_ERROR_HANDLE);
159  if (con && con != INVALID_HANDLE_VALUE && GetConsoleScreenBufferInfo(con, &con_info)) {
160  org_attributes = con_info.wAttributes;
161  use_color = 1;
162  } else
163  use_color = 0;
164  }
165  if (use_color)
166  SetConsoleTextAttribute(con, (org_attributes & 0xfff0) | (color & 0x0f));
167 #else
168  if (use_color < 0) {
169  const char *term = getenv("TERM");
170  use_color = term && strcmp(term, "dumb") && isatty(2);
171  }
172  if (use_color)
173  fprintf(stderr, "\x1b[%d;3%dm", (color & 0x08) >> 3, color & 0x07);
174 #endif
175 
176  va_start(arg, fmt);
177  vfprintf(stderr, fmt, arg);
178  va_end(arg);
179 
180  if (use_color) {
181 #if HAVE_SETCONSOLETEXTATTRIBUTE
182  SetConsoleTextAttribute(con, org_attributes);
183 #else
184  fprintf(stderr, "\x1b[0m");
185 #endif
186  }
187 }
188 
189 /* Deallocate a tree */
191 {
192  if (f) {
194  while (v) {
195  CheckasmFuncVersion *next = v->next;
196  free(v);
197  v = next;
198  }
199 
200  destroy_func_tree(f->child[0]);
201  destroy_func_tree(f->child[1]);
202  free(f);
203  }
204 }
205 
206 /* Allocate a zero-initialized block, clean up and exit on failure */
207 static void *checkasm_malloc(size_t size)
208 {
209  void *ptr = calloc(1, size);
210  if (!ptr) {
211  fprintf(stderr, "checkasm: malloc failed\n");
212  destroy_func_tree(state.funcs);
213  exit(1);
214  }
215  return ptr;
216 }
217 
218 /* Get the suffix of the specified cpu flag */
219 static const char *cpu_suffix(int cpu)
220 {
221  int i = FF_ARRAY_ELEMS(cpus);
222 
223  while (--i >= 0)
224  if (cpu & cpus[i].flag)
225  return cpus[i].suffix;
226 
227  return "c";
228 }
229 
230 #ifdef AV_READ_TIME
231 static int cmp_nop(const void *a, const void *b)
232 {
233  return *(const uint16_t*)a - *(const uint16_t*)b;
234 }
235 
236 /* Measure the overhead of the timing code (in decicycles) */
237 static int measure_nop_time(void)
238 {
239  uint16_t nops[10000];
240  int i, nop_sum = 0;
241 
242  for (i = 0; i < 10000; i++) {
243  uint64_t t = AV_READ_TIME();
244  nops[i] = AV_READ_TIME() - t;
245  }
246 
247  qsort(nops, 10000, sizeof(uint16_t), cmp_nop);
248  for (i = 2500; i < 7500; i++)
249  nop_sum += nops[i];
250 
251  return nop_sum / 500;
252 }
253 
254 /* Print benchmark results */
255 static void print_benchs(CheckasmFunc *f)
256 {
257  if (f) {
258  print_benchs(f->child[0]);
259 
260  /* Only print functions with at least one assembly version */
261  if (f->versions.cpu || f->versions.next) {
263  do {
264  if (v->iterations) {
265  int decicycles = (10*v->cycles/v->iterations - state.nop_time) / 4;
266  printf("%s_%s: %d.%d\n", f->name, cpu_suffix(v->cpu), decicycles/10, decicycles%10);
267  }
268  } while ((v = v->next));
269  }
270 
271  print_benchs(f->child[1]);
272  }
273 }
274 #endif
275 
276 /* ASCIIbetical sort except preserving natural order for numbers */
277 static int cmp_func_names(const char *a, const char *b)
278 {
279  int ascii_diff, digit_diff;
280 
281  for (; !(ascii_diff = *a - *b) && *a; a++, b++);
282  for (; av_isdigit(*a) && av_isdigit(*b); a++, b++);
283 
284  return (digit_diff = av_isdigit(*a) - av_isdigit(*b)) ? digit_diff : ascii_diff;
285 }
286 
287 /* Get a node with the specified name, creating it if it doesn't exist */
288 static CheckasmFunc *get_func(const char *name, int length)
289 {
290  CheckasmFunc *f, **f_ptr = &state.funcs;
291 
292  /* Search the tree for a matching node */
293  while ((f = *f_ptr)) {
294  int cmp = cmp_func_names(name, f->name);
295  if (!cmp)
296  return f;
297 
298  f_ptr = &f->child[(cmp > 0)];
299  }
300 
301  /* Allocate and insert a new node into the tree */
302  f = *f_ptr = checkasm_malloc(sizeof(CheckasmFunc) + length);
303  memcpy(f->name, name, length+1);
304 
305  return f;
306 }
307 
308 /* Perform tests and benchmarks for the specified cpu flag if supported by the host */
309 static void check_cpu_flag(const char *name, int flag)
310 {
311  int old_cpu_flag = state.cpu_flag;
312 
313  flag |= old_cpu_flag;
314  av_set_cpu_flags_mask(flag);
315  state.cpu_flag = av_get_cpu_flags();
316 
317  if (!flag || state.cpu_flag != old_cpu_flag) {
318  int i;
319 
320  state.cpu_flag_name = name;
321  for (i = 0; tests[i].func; i++) {
322  state.current_test_name = tests[i].name;
323  tests[i].func();
324  }
325  }
326 }
327 
328 /* Print the name of the current CPU flag, but only do it once */
329 static void print_cpu_name(void)
330 {
331  if (state.cpu_flag_name) {
332  color_printf(COLOR_YELLOW, "%s:\n", state.cpu_flag_name);
333  state.cpu_flag_name = NULL;
334  }
335 }
336 
337 int main(int argc, char *argv[])
338 {
339  int i, seed, ret = 0;
340 
341  if (!tests[0].func || !cpus[0].flag) {
342  fprintf(stderr, "checkasm: no tests to perform\n");
343  return 0;
344  }
345 
346  if (argc > 1 && !strncmp(argv[1], "--bench", 7)) {
347 #ifndef AV_READ_TIME
348  fprintf(stderr, "checkasm: --bench is not supported on your system\n");
349  return 1;
350 #endif
351  if (argv[1][7] == '=') {
352  state.bench_pattern = argv[1] + 8;
353  state.bench_pattern_len = strlen(state.bench_pattern);
354  } else
355  state.bench_pattern = "";
356 
357  argc--;
358  argv++;
359  }
360 
361  seed = (argc > 1) ? atoi(argv[1]) : av_get_random_seed();
362  fprintf(stderr, "checkasm: using random seed %u\n", seed);
363  av_lfg_init(&checkasm_lfg, seed);
364 
365  check_cpu_flag(NULL, 0);
366  for (i = 0; cpus[i].flag; i++)
367  check_cpu_flag(cpus[i].name, cpus[i].flag);
368 
369  if (state.num_failed) {
370  fprintf(stderr, "checkasm: %d of %d tests have failed\n", state.num_failed, state.num_checked);
371  ret = 1;
372  } else {
373  fprintf(stderr, "checkasm: all %d tests passed\n", state.num_checked);
374 #ifdef AV_READ_TIME
375  if (state.bench_pattern) {
376  state.nop_time = measure_nop_time();
377  printf("nop: %d.%d\n", state.nop_time/10, state.nop_time%10);
378  print_benchs(state.funcs);
379  }
380 #endif
381  }
382 
383  destroy_func_tree(state.funcs);
384  return ret;
385 }
386 
387 /* Decide whether or not the specified function needs to be tested and
388  * allocate/initialize data structures if needed. Returns a pointer to a
389  * reference function if the function should be tested, otherwise NULL */
390 void *checkasm_check_func(void *func, const char *name, ...)
391 {
392  char name_buf[256];
393  void *ref = func;
395  int name_length;
396  va_list arg;
397 
398  va_start(arg, name);
399  name_length = vsnprintf(name_buf, sizeof(name_buf), name, arg);
400  va_end(arg);
401 
402  if (!func || name_length <= 0 || name_length >= sizeof(name_buf))
403  return NULL;
404 
405  state.current_func = get_func(name_buf, name_length);
406  v = &state.current_func->versions;
407 
408  if (v->func) {
409  CheckasmFuncVersion *prev;
410  do {
411  /* Only test functions that haven't already been tested */
412  if (v->func == func)
413  return NULL;
414 
415  if (v->ok)
416  ref = v->func;
417 
418  prev = v;
419  } while ((v = v->next));
420 
421  v = prev->next = checkasm_malloc(sizeof(CheckasmFuncVersion));
422  }
423 
424  v->func = func;
425  v->ok = 1;
426  v->cpu = state.cpu_flag;
427  state.current_func_ver = v;
428 
429  if (state.cpu_flag)
430  state.num_checked++;
431 
432  return ref;
433 }
434 
435 /* Decide whether or not the current function needs to be benchmarked */
437 {
438  return !state.num_failed && state.bench_pattern &&
439  !strncmp(state.current_func->name, state.bench_pattern, state.bench_pattern_len);
440 }
441 
442 /* Indicate that the current test has failed */
443 void checkasm_fail_func(const char *msg, ...)
444 {
445  if (state.current_func_ver->cpu && state.current_func_ver->ok) {
446  va_list arg;
447 
448  print_cpu_name();
449  fprintf(stderr, " %s_%s (", state.current_func->name, cpu_suffix(state.current_func_ver->cpu));
450  va_start(arg, msg);
451  vfprintf(stderr, msg, arg);
452  va_end(arg);
453  fprintf(stderr, ")\n");
454 
455  state.current_func_ver->ok = 0;
456  state.num_failed++;
457  }
458 }
459 
460 /* Update benchmark results of the current function */
461 void checkasm_update_bench(int iterations, uint64_t cycles)
462 {
463  state.current_func_ver->iterations += iterations;
464  state.current_func_ver->cycles += cycles;
465 }
466 
467 /* Print the outcome of all tests performed since the last time this function was called */
468 void checkasm_report(const char *name, ...)
469 {
470  static int prev_checked, prev_failed, max_length;
471 
472  if (state.num_checked > prev_checked) {
473  int pad_length = max_length + 4;
474  va_list arg;
475 
476  print_cpu_name();
477  pad_length -= fprintf(stderr, " - %s.", state.current_test_name);
478  va_start(arg, name);
479  pad_length -= vfprintf(stderr, name, arg);
480  va_end(arg);
481  fprintf(stderr, "%*c", FFMAX(pad_length, 0) + 2, '[');
482 
483  if (state.num_failed == prev_failed)
484  color_printf(COLOR_GREEN, "OK");
485  else
486  color_printf(COLOR_RED, "FAILED");
487  fprintf(stderr, "]\n");
488 
489  prev_checked = state.num_checked;
490  prev_failed = state.num_failed;
491  } else if (!state.cpu_flag) {
492  /* Calculate the amount of padding required to make the output vertically aligned */
493  int length = strlen(state.current_test_name);
494  va_list arg;
495 
496  va_start(arg, name);
497  length += vsnprintf(NULL, 0, name, arg);
498  va_end(arg);
499 
500  if (length > max_length)
501  max_length = length;
502  }
503 }
Definition: lfg.h:25
const char * name
Definition: checkasm.c:57
#define AV_CPU_FLAG_AVX
AVX functions: requires OS support even if YMM registers aren't used.
Definition: cpu.h:45
#define NULL
Definition: coverity.c:32
int av_isdigit(int c)
Locale-independent conversion of ASCII isdigit.
Definition: avstring.c:320
#define AV_CPU_FLAG_ALTIVEC
standard
Definition: cpu.h:59
float v
CheckasmFunc * current_func
Definition: checkasm.c:131
const char * fmt
Definition: avisynth_c.h:632
static const struct @195 tests[]
#define AV_CPU_FLAG_SSE
SSE functions.
Definition: cpu.h:33
#define vsnprintf
Definition: snprintf.h:36
const char * b
Definition: vf_curves.c:109
void av_set_cpu_flags_mask(int mask)
Set a mask on flags returned by av_get_cpu_flags().
Definition: cpu.c:94
#define AV_CPU_FLAG_CMOV
supports cmov instruction
Definition: cpu.h:50
void checkasm_check_h264pred(void)
Definition: h264pred.c:232
#define AV_CPU_FLAG_VFP
Definition: cpu.h:66
static const char * cpu_suffix(int cpu)
Definition: checkasm.c:219
CheckasmFuncVersion * current_func_ver
Definition: checkasm.c:132
void(* func)(void)
Definition: checkasm.c:58
static int cmp_func_names(const char *a, const char *b)
Definition: checkasm.c:277
void * checkasm_check_func(void *func, const char *name,...)
Definition: checkasm.c:390
struct CheckasmFunc * child[2]
Definition: checkasm.c:123
const char * cpu_flag_name
Definition: checkasm.c:140
int checkasm_bench_func(void)
Definition: checkasm.c:436
#define AV_CPU_FLAG_FMA3
Haswell FMA3 functions.
Definition: cpu.h:55
char name[1]
Definition: checkasm.c:125
#define AV_CPU_FLAG_NEON
Definition: cpu.h:68
#define AV_CPU_FLAG_MMXEXT
SSE integer functions or AMD MMX ext.
Definition: cpu.h:30
int main(int argc, char *argv[])
Definition: checkasm.c:337
#define AV_CPU_FLAG_ATOM
Atom processor, some SSSE3 instructions are slower.
Definition: cpu.h:42
#define COLOR_YELLOW
Definition: checkasm.c:44
#define AV_READ_TIME
Definition: timer.h:26
#define AV_CPU_FLAG_AVX2
AVX2 functions: requires OS support even if YMM registers aren't used.
Definition: cpu.h:54
#define AV_CPU_FLAG_SSE2SLOW
SSE2 supported, but usually not faster.
Definition: cpu.h:35
void checkasm_check_h264qpel(void)
Definition: h264qpel.c:50
ptrdiff_t size
Definition: opengl_enc.c:101
CheckasmFunc * funcs
Definition: checkasm.c:130
#define AV_CPU_FLAG_XOP
Bulldozer XOP functions.
Definition: cpu.h:47
int flag
Definition: checkasm.c:76
#define AV_CPU_FLAG_SSE42
Nehalem SSE4.2 functions.
Definition: cpu.h:44
#define isatty(fd)
Definition: checkasm.c:52
CheckasmFuncVersion versions
Definition: checkasm.c:124
const char * suffix
Definition: checkasm.c:75
#define AV_CPU_FLAG_SSSE3
Conroe SSSE3 functions.
Definition: cpu.h:41
unsigned short WORD
int num_checked
Definition: checkasm.c:136
#define COLOR_GREEN
Definition: checkasm.c:43
const char * arg
Definition: jacosubdec.c:66
#define AV_CPU_FLAG_ARMV6T2
Definition: cpu.h:65
GLsizei GLsizei * length
Definition: opengl_enc.c:115
static CheckasmFunc * get_func(const char *name, int length)
Definition: checkasm.c:288
AVLFG checkasm_lfg
Definition: checkasm.c:144
#define FFMAX(a, b)
Definition: common.h:79
#define AV_CPU_FLAG_ARMV5TE
Definition: cpu.h:63
#define AV_CPU_FLAG_SSE3
Prescott SSE3 functions.
Definition: cpu.h:38
PVOID HANDLE
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
static struct @197 state
static av_always_inline int cmp(MpegEncContext *s, const int x, const int y, const int subx, const int suby, const int size, const int h, int ref_index, int src_index, me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, const int flags)
compares a block (either a full macroblock or a partition thereof) against a proposed motion-compensa...
Definition: motion_est.c:260
#define AV_CPU_FLAG_VFPV3
Definition: cpu.h:67
static void * checkasm_malloc(size_t size)
Definition: checkasm.c:207
const char * bench_pattern
Definition: checkasm.c:134
int bench_pattern_len
Definition: checkasm.c:135
void checkasm_report(const char *name,...)
Definition: checkasm.c:468
#define FF_ARRAY_ELEMS(a)
int cpu_flag
Definition: checkasm.c:139
#define AV_CPU_FLAG_3DNOW
AMD 3DNOW.
Definition: cpu.h:32
int nop_time
Definition: checkasm.c:138
#define AV_CPU_FLAG_ARMV6
Definition: cpu.h:64
int num_failed
Definition: checkasm.c:137
#define AV_CPU_FLAG_SSE3SLOW
SSE3 supported, but usually not faster.
Definition: cpu.h:39
#define COLOR_RED
Definition: checkasm.c:42
#define AV_CPU_FLAG_MMX
standard MMX
Definition: cpu.h:29
static unsigned int seed
Definition: videogen.c:78
static const struct @196 cpus[]
#define AV_CPU_FLAG_FMA4
Bulldozer FMA4 functions.
Definition: cpu.h:48
#define AV_CPU_FLAG_SSE4
Penryn SSE4.1 functions.
Definition: cpu.h:43
#define AV_CPU_FLAG_VSX
ISA 2.06.
Definition: cpu.h:60
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:30
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:76
static void color_printf(int color, const char *fmt,...)
Definition: checkasm.c:147
#define AV_CPU_FLAG_3DNOWEXT
AMD 3DNowExt.
Definition: cpu.h:37
#define AV_CPU_FLAG_POWER8
ISA 2.07.
Definition: cpu.h:61
void checkasm_update_bench(int iterations, uint64_t cycles)
Definition: checkasm.c:461
static void destroy_func_tree(CheckasmFunc *f)
Definition: checkasm.c:190
common internal and external API header
struct CheckasmFuncVersion * next
Definition: checkasm.c:113
#define AV_CPU_FLAG_ARMV8
Definition: cpu.h:69
const char * current_test_name
Definition: checkasm.c:133
static void check_cpu_flag(const char *name, int flag)
Definition: checkasm.c:309
static int use_color
Definition: log.c:123
#define AV_CPU_FLAG_SSE2
PIV SSE2 functions.
Definition: cpu.h:34
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
Definition: random_seed.c:109
void checkasm_fail_func(const char *msg,...)
Definition: checkasm.c:443
#define INVALID_HANDLE_VALUE
Definition: windows2linux.h:47
void checkasm_check_bswapdsp(void)
Definition: bswapdsp.c:59
const char * name
Definition: opengl_enc.c:103
static void print_cpu_name(void)
Definition: checkasm.c:329