File: cpu-features.h

package info (click to toggle)
glibc 2.24-11+deb9u4
  • links: PTS, VCS
  • area: main
  • in suites: stretch, stretch-proposed-updates
  • size: 225,852 kB
  • sloc: ansic: 996,505; asm: 261,827; sh: 10,484; makefile: 9,856; cpp: 4,169; python: 3,971; perl: 2,254; awk: 1,753; pascal: 1,521; yacc: 291; sed: 80
file content (349 lines) | stat: -rw-r--r-- 13,000 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
/* This file is part of the GNU C Library.
   Copyright (C) 2008-2016 Free Software Foundation, Inc.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef cpu_features_h
#define cpu_features_h

#define bit_arch_Fast_Rep_String		(1 << 0)
#define bit_arch_Fast_Copy_Backward		(1 << 1)
#define bit_arch_Slow_BSF			(1 << 2)
#define bit_arch_Fast_Unaligned_Load		(1 << 4)
#define bit_arch_Prefer_PMINUB_for_stringop	(1 << 5)
#define bit_arch_AVX_Usable			(1 << 6)
#define bit_arch_FMA_Usable			(1 << 7)
#define bit_arch_FMA4_Usable			(1 << 8)
#define bit_arch_Slow_SSE4_2			(1 << 9)
#define bit_arch_AVX2_Usable			(1 << 10)
#define bit_arch_AVX_Fast_Unaligned_Load	(1 << 11)
#define bit_arch_AVX512F_Usable			(1 << 12)
#define bit_arch_AVX512DQ_Usable		(1 << 13)
#define bit_arch_I586				(1 << 14)
#define bit_arch_I686				(1 << 15)
#define bit_arch_Prefer_MAP_32BIT_EXEC		(1 << 16)
#define bit_arch_Prefer_No_VZEROUPPER		(1 << 17)
#define bit_arch_Fast_Unaligned_Copy		(1 << 18)
#define bit_arch_Prefer_ERMS			(1 << 19)
#define bit_arch_Prefer_No_AVX512		(1 << 20)
#define bit_arch_XSAVEC_Usable			(1 << 21)

/* CPUID Feature flags.  */

/* COMMON_CPUID_INDEX_1.  */
#define bit_cpu_CX8		(1 << 8)
#define bit_cpu_CMOV		(1 << 15)
#define bit_cpu_SSE2		(1 << 26)
#define bit_cpu_SSSE3		(1 << 9)
#define bit_cpu_SSE4_1		(1 << 19)
#define bit_cpu_SSE4_2		(1 << 20)
#define bit_cpu_OSXSAVE		(1 << 27)
#define bit_cpu_AVX		(1 << 28)
#define bit_cpu_POPCOUNT	(1 << 23)
#define bit_cpu_FMA		(1 << 12)
#define bit_cpu_FMA4		(1 << 16)
#define bit_cpu_HTT		(1 << 28)

/* COMMON_CPUID_INDEX_7.  */
#define bit_cpu_HLE		(1 << 4)
#define bit_cpu_ERMS		(1 << 9)
#define bit_cpu_RTM		(1 << 11)
#define bit_cpu_AVX2		(1 << 5)
#define bit_cpu_AVX512F		(1 << 16)
#define bit_cpu_AVX512DQ	(1 << 17)
#define bit_cpu_AVX512PF	(1 << 26)
#define bit_cpu_AVX512ER	(1 << 27)
#define bit_cpu_AVX512CD	(1 << 28)
#define bit_cpu_AVX512BW	(1 << 30)
#define bit_cpu_AVX512VL	(1u << 31)

/* XCR0 Feature flags.  */
#define bit_XMM_state		(1 << 1)
#define bit_YMM_state		(2 << 1)
#define bit_Opmask_state	(1 << 5)
#define bit_ZMM0_15_state	(1 << 6)
#define bit_ZMM16_31_state	(1 << 7)

/* The integer bit array index for the first set of internal feature bits.  */
#define FEATURE_INDEX_1 0

/* The current maximum size of the feature integer bit array.  */
#define FEATURE_INDEX_MAX 1

/* Offset for fxsave/xsave area used by _dl_runtime_resolve.  Also need
   space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX.  It must be
   aligned to 16 bytes for fxsave and 64 bytes for xsave.  */
#define STATE_SAVE_OFFSET (8 * 7 + 8)

/* Save SSE, AVX, AVX512, mask and bound registers.  */
#define STATE_SAVE_MASK \
  ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7))

#ifdef	__ASSEMBLER__

# include <cpu-features-offsets.h>

# define index_cpu_CX8	COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET
# define index_cpu_CMOV	COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET
# define index_cpu_SSE2	COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET
# define index_cpu_SSSE3 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
# define index_cpu_SSE4_1 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
# define index_cpu_SSE4_2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
# define index_cpu_AVX	COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
# define index_cpu_AVX2	COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_OFFSET
# define index_cpu_ERMS	COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_OFFSET

# define index_arch_Fast_Rep_String	FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Fast_Copy_Backward	FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Slow_BSF		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Fast_Unaligned_Load	FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Prefer_PMINUB_for_stringop FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_AVX_Usable		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_FMA_Usable		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_FMA4_Usable		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Slow_SSE4_2		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_AVX2_Usable		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_AVX_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_AVX512F_Usable	FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_AVX512DQ_Usable	FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_I586		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_I686		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Prefer_MAP_32BIT_EXEC FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Prefer_No_VZEROUPPER FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Fast_Unaligned_Copy	FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Prefer_ERMS		FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Use_dl_runtime_resolve_opt FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Use_dl_runtime_resolve_slow FEATURE_INDEX_1*FEATURE_SIZE
# define index_arch_Prefer_No_AVX512	FEATURE_INDEX_1*FEATURE_SIZE


# if defined (_LIBC) && !IS_IN (nonlib)
#  ifdef __x86_64__
#   ifdef SHARED
#    if IS_IN (rtld)
#     define LOAD_RTLD_GLOBAL_RO_RDX
#     define HAS_FEATURE(offset, field, name) \
  testl $(bit_##field##_##name), \
	_rtld_local_ro+offset+(index_##field##_##name)(%rip)
#    else
#      define LOAD_RTLD_GLOBAL_RO_RDX \
  mov _rtld_global_ro@GOTPCREL(%rip), %RDX_LP
#     define HAS_FEATURE(offset, field, name) \
  testl $(bit_##field##_##name), \
	RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+offset+(index_##field##_##name)(%rdx)
#    endif
#   else /* SHARED */
#    define LOAD_RTLD_GLOBAL_RO_RDX
#    define HAS_FEATURE(offset, field, name) \
  testl $(bit_##field##_##name), \
	_dl_x86_cpu_features+offset+(index_##field##_##name)(%rip)
#   endif /* !SHARED */
#  else  /* __x86_64__ */
#   ifdef SHARED
#    define LOAD_FUNC_GOT_EAX(func) \
  leal func@GOTOFF(%edx), %eax
#    if IS_IN (rtld)
#    define LOAD_GOT_AND_RTLD_GLOBAL_RO \
  LOAD_PIC_REG(dx)
#     define HAS_FEATURE(offset, field, name) \
  testl $(bit_##field##_##name), \
	offset+(index_##field##_##name)+_rtld_local_ro@GOTOFF(%edx)
#    else
#     define LOAD_GOT_AND_RTLD_GLOBAL_RO \
  LOAD_PIC_REG(dx); \
  mov _rtld_global_ro@GOT(%edx), %ecx
#     define HAS_FEATURE(offset, field, name) \
  testl $(bit_##field##_##name), \
	RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+offset+(index_##field##_##name)(%ecx)
#    endif
#   else  /* SHARED */
#    define LOAD_FUNC_GOT_EAX(func) \
  leal func, %eax
#    define LOAD_GOT_AND_RTLD_GLOBAL_RO
#    define HAS_FEATURE(offset, field, name) \
  testl $(bit_##field##_##name), \
	_dl_x86_cpu_features+offset+(index_##field##_##name)
#   endif /* !SHARED */
#  endif /* !__x86_64__ */
# else /* _LIBC && !nonlib */
#  error "Sorry, <cpu-features.h> is unimplemented for assembler"
# endif /* !_LIBC || nonlib */

/* HAS_* evaluates to true if we may use the feature at runtime.  */
# define HAS_CPU_FEATURE(name)	HAS_FEATURE (CPUID_OFFSET, cpu, name)
# define HAS_ARCH_FEATURE(name) HAS_FEATURE (FEATURE_OFFSET, arch, name)

#else	/* __ASSEMBLER__ */

enum
  {
    COMMON_CPUID_INDEX_1 = 0,
    COMMON_CPUID_INDEX_7,
    COMMON_CPUID_INDEX_80000001,	/* for AMD */
    /* Keep the following line at the end.  */
    COMMON_CPUID_INDEX_MAX
  };

struct cpu_features
{
  enum cpu_features_kind
    {
      arch_kind_unknown = 0,
      arch_kind_intel,
      arch_kind_amd,
      arch_kind_other
    } kind;
  int max_cpuid;
  struct cpuid_registers
  {
    unsigned int eax;
    unsigned int ebx;
    unsigned int ecx;
    unsigned int edx;
  } cpuid[COMMON_CPUID_INDEX_MAX];
  unsigned int family;
  unsigned int model;
  /* The type must be unsigned long int so that we use

	sub xsave_state_size_offset(%rip) %RSP_LP

     in _dl_runtime_resolve.  */
  unsigned long int xsave_state_size;
  unsigned int feature[FEATURE_INDEX_MAX];
};

/* Used from outside of glibc to get access to the CPU features
   structure.  */
extern const struct cpu_features *__get_cpu_features (void)
     __attribute__ ((const));

# if defined (_LIBC) && !IS_IN (nonlib)
/* Unused for x86.  */
#  define INIT_ARCH()
#  define __get_cpu_features()	(&GLRO(dl_x86_cpu_features))
# endif


/* Only used directly in cpu-features.c.  */
# define CPU_FEATURES_CPU_P(ptr, name) \
  ((ptr->cpuid[index_cpu_##name].reg_##name & (bit_cpu_##name)) != 0)
# define CPU_FEATURES_ARCH_P(ptr, name) \
  ((ptr->feature[index_arch_##name] & (bit_arch_##name)) != 0)

/* HAS_* evaluates to true if we may use the feature at runtime.  */
# define HAS_CPU_FEATURE(name) \
   CPU_FEATURES_CPU_P (__get_cpu_features (), name)
# define HAS_ARCH_FEATURE(name) \
   CPU_FEATURES_ARCH_P (__get_cpu_features (), name)

# define index_cpu_CX8		COMMON_CPUID_INDEX_1
# define index_cpu_CMOV		COMMON_CPUID_INDEX_1
# define index_cpu_SSE2		COMMON_CPUID_INDEX_1
# define index_cpu_SSSE3	COMMON_CPUID_INDEX_1
# define index_cpu_SSE4_1	COMMON_CPUID_INDEX_1
# define index_cpu_SSE4_2	COMMON_CPUID_INDEX_1
# define index_cpu_AVX		COMMON_CPUID_INDEX_1
# define index_cpu_AVX2		COMMON_CPUID_INDEX_7
# define index_cpu_AVX512F	COMMON_CPUID_INDEX_7
# define index_cpu_AVX512DQ	COMMON_CPUID_INDEX_7
# define index_cpu_AVX512PF	COMMON_CPUID_INDEX_7
# define index_cpu_AVX512ER	COMMON_CPUID_INDEX_7
# define index_cpu_AVX512CD	COMMON_CPUID_INDEX_7
# define index_cpu_AVX512BW	COMMON_CPUID_INDEX_7
# define index_cpu_AVX512VL	COMMON_CPUID_INDEX_7
# define index_cpu_ERMS		COMMON_CPUID_INDEX_7
# define index_cpu_RTM		COMMON_CPUID_INDEX_7
# define index_cpu_FMA		COMMON_CPUID_INDEX_1
# define index_cpu_FMA4		COMMON_CPUID_INDEX_80000001
# define index_cpu_POPCOUNT	COMMON_CPUID_INDEX_1
# define index_cpu_OSXSAVE	COMMON_CPUID_INDEX_1
# define index_cpu_HTT		COMMON_CPUID_INDEX_1

# define reg_CX8		edx
# define reg_CMOV		edx
# define reg_SSE2		edx
# define reg_SSSE3		ecx
# define reg_SSE4_1		ecx
# define reg_SSE4_2		ecx
# define reg_AVX		ecx
# define reg_AVX2		ebx
# define reg_AVX512F		ebx
# define reg_AVX512DQ		ebx
# define reg_AVX512PF		ebx
# define reg_AVX512ER		ebx
# define reg_AVX512CD		ebx
# define reg_AVX512BW		ebx
# define reg_AVX512VL		ebx
# define reg_ERMS		ebx
# define reg_RTM		ebx
# define reg_FMA		ecx
# define reg_FMA4		ecx
# define reg_POPCOUNT		ecx
# define reg_OSXSAVE		ecx
# define reg_HTT		edx

# define index_arch_Fast_Rep_String	FEATURE_INDEX_1
# define index_arch_Fast_Copy_Backward	FEATURE_INDEX_1
# define index_arch_Slow_BSF		FEATURE_INDEX_1
# define index_arch_Fast_Unaligned_Load	FEATURE_INDEX_1
# define index_arch_Prefer_PMINUB_for_stringop FEATURE_INDEX_1
# define index_arch_AVX_Usable		FEATURE_INDEX_1
# define index_arch_FMA_Usable		FEATURE_INDEX_1
# define index_arch_FMA4_Usable		FEATURE_INDEX_1
# define index_arch_Slow_SSE4_2		FEATURE_INDEX_1
# define index_arch_AVX2_Usable		FEATURE_INDEX_1
# define index_arch_AVX_Fast_Unaligned_Load FEATURE_INDEX_1
# define index_arch_AVX512F_Usable	FEATURE_INDEX_1
# define index_arch_AVX512DQ_Usable	FEATURE_INDEX_1
# define index_arch_I586		FEATURE_INDEX_1
# define index_arch_I686		FEATURE_INDEX_1
# define index_arch_Prefer_MAP_32BIT_EXEC FEATURE_INDEX_1
# define index_arch_Prefer_No_VZEROUPPER FEATURE_INDEX_1
# define index_arch_Fast_Unaligned_Copy	FEATURE_INDEX_1
# define index_arch_Prefer_ERMS		FEATURE_INDEX_1
# define index_arch_Prefer_No_AVX512	FEATURE_INDEX_1
# define index_arch_XSAVEC_Usable	FEATURE_INDEX_1

#endif	/* !__ASSEMBLER__ */

#ifdef __x86_64__
# define HAS_CPUID 1
#elif defined __i586__ || defined __pentium__
# define HAS_CPUID 1
# define HAS_I586 1
# define HAS_I686 HAS_ARCH_FEATURE (I686)
#elif (defined __i686__ || defined __pentiumpro__		\
       || defined __pentium4__ || defined __nocona__		\
       || defined __atom__ || defined __core2__			\
       || defined __corei7__ || defined __corei7_avx__		\
       || defined __core_avx2__	|| defined __nehalem__		\
       || defined __sandybridge__ || defined __haswell__	\
       || defined __knl__ || defined __bonnell__		\
       || defined __silvermont__				\
       || defined __k6__ || defined __k8__			\
       || defined __athlon__ || defined __amdfam10__		\
       || defined __bdver1__ || defined __bdver2__		\
       || defined __bdver3__ || defined __bdver4__		\
       || defined __btver1__ || defined __btver2__)
# define HAS_CPUID 1
# define HAS_I586 1
# define HAS_I686 1
#else
# define HAS_CPUID 0
# define HAS_I586 HAS_ARCH_FEATURE (I586)
# define HAS_I686 HAS_ARCH_FEATURE (I686)
#endif

#endif  /* cpu_features_h */