sysdeps/x86/cpu-features.h

   1 /* This file is part of the GNU C Library.
   2    Copyright (C) 2008-2017 Free Software Foundation, Inc.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef cpu_features_h
  19 #define cpu_features_h
  20
  21 #define bit_arch_Fast_Rep_String                (1 << 0)
  22 #define bit_arch_Fast_Copy_Backward             (1 << 1)
  23 #define bit_arch_Slow_BSF                       (1 << 2)
  24 #define bit_arch_Fast_Unaligned_Load            (1 << 4)
  25 #define bit_arch_Prefer_PMINUB_for_stringop     (1 << 5)
  26 #define bit_arch_AVX_Usable                     (1 << 6)
  27 #define bit_arch_FMA_Usable                     (1 << 7)
  28 #define bit_arch_FMA4_Usable                    (1 << 8)
  29 #define bit_arch_Slow_SSE4_2                    (1 << 9)
  30 #define bit_arch_AVX2_Usable                    (1 << 10)
  31 #define bit_arch_AVX_Fast_Unaligned_Load        (1 << 11)
  32 #define bit_arch_AVX512F_Usable                 (1 << 12)
  33 #define bit_arch_AVX512DQ_Usable                (1 << 13)
  34 #define bit_arch_I586                           (1 << 14)
  35 #define bit_arch_I686                           (1 << 15)
  36 #define bit_arch_Prefer_MAP_32BIT_EXEC          (1 << 16)
  37 #define bit_arch_Prefer_No_VZEROUPPER           (1 << 17)
  38 #define bit_arch_Fast_Unaligned_Copy            (1 << 18)
  39 #define bit_arch_Prefer_ERMS                    (1 << 19)
  40 #define bit_arch_Prefer_No_AVX512               (1 << 20)
  41 #define bit_arch_MathVec_Prefer_No_AVX512       (1 << 21)
  42 #define bit_arch_XSAVEC_Usable                  (1 << 22)
  43
  44 /* CPUID Feature flags.  */
  45
  46 /* COMMON_CPUID_INDEX_1.  */
  47 #define bit_cpu_CX8             (1 << 8)
  48 #define bit_cpu_CMOV            (1 << 15)
  49 #define bit_cpu_SSE             (1 << 25)
  50 #define bit_cpu_SSE2            (1 << 26)
  51 #define bit_cpu_SSSE3           (1 << 9)
  52 #define bit_cpu_SSE4_1          (1 << 19)
  53 #define bit_cpu_SSE4_2          (1 << 20)
  54 #define bit_cpu_OSXSAVE         (1 << 27)
  55 #define bit_cpu_AVX             (1 << 28)
  56 #define bit_cpu_POPCOUNT        (1 << 23)
  57 #define bit_cpu_FMA             (1 << 12)
  58 #define bit_cpu_FMA4            (1 << 16)
  59 #define bit_cpu_HTT             (1 << 28)
  60 #define bit_cpu_LZCNT           (1 << 5)
  61 #define bit_cpu_MOVBE           (1 << 22)
  62 #define bit_cpu_POPCNT          (1 << 23)
  63
  64 /* COMMON_CPUID_INDEX_7.  */
  65 #define bit_cpu_BMI1            (1 << 3)
  66 #define bit_cpu_BMI2            (1 << 8)
  67 #define bit_cpu_ERMS            (1 << 9)
  68 #define bit_cpu_RTM             (1 << 11)
  69 #define bit_cpu_AVX2            (1 << 5)
  70 #define bit_cpu_AVX512F         (1 << 16)
  71 #define bit_cpu_AVX512DQ        (1 << 17)
  72 #define bit_cpu_AVX512PF        (1 << 26)
  73 #define bit_cpu_AVX512ER        (1 << 27)
  74 #define bit_cpu_AVX512CD        (1 << 28)
  75 #define bit_cpu_AVX512BW        (1 << 30)
  76 #define bit_cpu_AVX512VL        (1u << 31)
  77 #define bit_cpu_IBT             (1u << 20)
  78 #define bit_cpu_SHSTK           (1u << 7)
  79
  80 /* XCR0 Feature flags.  */
  81 #define bit_XMM_state           (1 << 1)
  82 #define bit_YMM_state           (1 << 2)
  83 #define bit_Opmask_state        (1 << 5)
  84 #define bit_ZMM0_15_state       (1 << 6)
  85 #define bit_ZMM16_31_state      (1 << 7)
  86
  87 /* The integer bit array index for the first set of internal feature bits.  */
  88 #define FEATURE_INDEX_1 0
  89
  90 /* The current maximum size of the feature integer bit array.  */
  91 #define FEATURE_INDEX_MAX 1
  92
  93 /* Offset for fxsave/xsave area used by _dl_runtime_resolve.  Also need
  94    space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX.  It must be
  95    aligned to 16 bytes for fxsave and 64 bytes for xsave.  */
  96 #define STATE_SAVE_OFFSET (8 * 7 + 8)
  97
  98 /* Save SSE, AVX, AVX512, mask and bound registers.  */
  99 #define STATE_SAVE_MASK \
 100   ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7))
 101
 102 #ifdef  __ASSEMBLER__
 103 # include <cpu-features-offsets.h>
 104 #else   /* __ASSEMBLER__ */
 105 enum
 106   {
 107     COMMON_CPUID_INDEX_1 = 0,
 108     COMMON_CPUID_INDEX_7,
 109     COMMON_CPUID_INDEX_80000001,        /* for AMD */
 110     /* Keep the following line at the end.  */
 111     COMMON_CPUID_INDEX_MAX
 112   };
 113
 114 struct cpu_features
 115 {
 116   enum cpu_features_kind
 117     {
 118       arch_kind_unknown = 0,
 119       arch_kind_intel,
 120       arch_kind_amd,
 121       arch_kind_other
 122     } kind;
 123   int max_cpuid;
 124   struct cpuid_registers
 125   {
 126     unsigned int eax;
 127     unsigned int ebx;
 128     unsigned int ecx;
 129     unsigned int edx;
 130   } cpuid[COMMON_CPUID_INDEX_MAX];
 131   unsigned int family;
 132   unsigned int model;
 133   /* The state size for XSAVEC or XSAVE.  The type must be unsigned long
 134      int so that we use
 135
 136         sub xsave_state_size_offset(%rip) %RSP_LP
 137
 138      in _dl_runtime_resolve.  */
 139   unsigned long int xsave_state_size;
 140   /* The full state size for XSAVE when XSAVEC is disabled by
 141
 142      GLIBC_TUNABLES=glibc.tune.hwcaps=-XSAVEC_Usable
 143    */
 144   unsigned int xsave_state_full_size;
 145   unsigned int feature[FEATURE_INDEX_MAX];
 146   /* Data cache size for use in memory and string routines, typically
 147      L1 size.  */
 148   unsigned long int data_cache_size;
 149   /* Shared cache size for use in memory and string routines, typically
 150      L2 or L3 size.  */
 151   unsigned long int shared_cache_size;
 152   /* Threshold to use non temporal store.  */
 153   unsigned long int non_temporal_threshold;
 154 };
 155
 156 /* Used from outside of glibc to get access to the CPU features
 157    structure.  */
 158 extern const struct cpu_features *__get_cpu_features (void)
 159      __attribute__ ((const));
 160
 161 # if defined (_LIBC) && !IS_IN (nonlib)
 162 /* Unused for x86.  */
 163 #  define INIT_ARCH()
 164 #  define __get_cpu_features()  (&GLRO(dl_x86_cpu_features))
 165 # endif
 166
 167
 168 /* Only used directly in cpu-features.c.  */
 169 # define CPU_FEATURES_CPU_P(ptr, name) \
 170   ((ptr->cpuid[index_cpu_##name].reg_##name & (bit_cpu_##name)) != 0)
 171 # define CPU_FEATURES_ARCH_P(ptr, name) \
 172   ((ptr->feature[index_arch_##name] & (bit_arch_##name)) != 0)
 173
 174 /* HAS_* evaluates to true if we may use the feature at runtime.  */
 175 # define HAS_CPU_FEATURE(name) \
 176    CPU_FEATURES_CPU_P (__get_cpu_features (), name)
 177 # define HAS_ARCH_FEATURE(name) \
 178    CPU_FEATURES_ARCH_P (__get_cpu_features (), name)
 179
 180 # define index_cpu_CX8          COMMON_CPUID_INDEX_1
 181 # define index_cpu_CMOV         COMMON_CPUID_INDEX_1
 182 # define index_cpu_SSE          COMMON_CPUID_INDEX_1
 183 # define index_cpu_SSE2         COMMON_CPUID_INDEX_1
 184 # define index_cpu_SSSE3        COMMON_CPUID_INDEX_1
 185 # define index_cpu_SSE4_1       COMMON_CPUID_INDEX_1
 186 # define index_cpu_SSE4_2       COMMON_CPUID_INDEX_1
 187 # define index_cpu_AVX          COMMON_CPUID_INDEX_1
 188 # define index_cpu_AVX2         COMMON_CPUID_INDEX_7
 189 # define index_cpu_AVX512F      COMMON_CPUID_INDEX_7
 190 # define index_cpu_AVX512DQ     COMMON_CPUID_INDEX_7
 191 # define index_cpu_AVX512PF     COMMON_CPUID_INDEX_7
 192 # define index_cpu_AVX512ER     COMMON_CPUID_INDEX_7
 193 # define index_cpu_AVX512CD     COMMON_CPUID_INDEX_7
 194 # define index_cpu_AVX512BW     COMMON_CPUID_INDEX_7
 195 # define index_cpu_AVX512VL     COMMON_CPUID_INDEX_7
 196 # define index_cpu_ERMS         COMMON_CPUID_INDEX_7
 197 # define index_cpu_RTM          COMMON_CPUID_INDEX_7
 198 # define index_cpu_FMA          COMMON_CPUID_INDEX_1
 199 # define index_cpu_FMA4         COMMON_CPUID_INDEX_80000001
 200 # define index_cpu_POPCOUNT     COMMON_CPUID_INDEX_1
 201 # define index_cpu_OSXSAVE      COMMON_CPUID_INDEX_1
 202 # define index_cpu_HTT          COMMON_CPUID_INDEX_1
 203 # define index_cpu_BMI1         COMMON_CPUID_INDEX_7
 204 # define index_cpu_BMI2         COMMON_CPUID_INDEX_7
 205 # define index_cpu_LZCNT        COMMON_CPUID_INDEX_1
 206 # define index_cpu_MOVBE        COMMON_CPUID_INDEX_1
 207 # define index_cpu_POPCNT       COMMON_CPUID_INDEX_1
 208 # define index_cpu_IBT          COMMON_CPUID_INDEX_7
 209 # define index_cpu_SHSTK        COMMON_CPUID_INDEX_7
 210
 211 # define reg_CX8                edx
 212 # define reg_CMOV               edx
 213 # define reg_SSE                edx
 214 # define reg_SSE2               edx
 215 # define reg_SSSE3              ecx
 216 # define reg_SSE4_1             ecx
 217 # define reg_SSE4_2             ecx
 218 # define reg_AVX                ecx
 219 # define reg_AVX2               ebx
 220 # define reg_AVX512F            ebx
 221 # define reg_AVX512DQ           ebx
 222 # define reg_AVX512PF           ebx
 223 # define reg_AVX512ER           ebx
 224 # define reg_AVX512CD           ebx
 225 # define reg_AVX512BW           ebx
 226 # define reg_AVX512VL           ebx
 227 # define reg_ERMS               ebx
 228 # define reg_RTM                ebx
 229 # define reg_FMA                ecx
 230 # define reg_FMA4               ecx
 231 # define reg_POPCOUNT           ecx
 232 # define reg_OSXSAVE            ecx
 233 # define reg_HTT                edx
 234 # define reg_BMI1               ebx
 235 # define reg_BMI2               ebx
 236 # define reg_LZCNT              ecx
 237 # define reg_MOVBE              ecx
 238 # define reg_POPCNT             ecx
 239 # define reg_IBT                edx
 240 # define reg_SHSTK              ecx
 241
 242 # define index_arch_Fast_Rep_String     FEATURE_INDEX_1
 243 # define index_arch_Fast_Copy_Backward  FEATURE_INDEX_1
 244 # define index_arch_Slow_BSF            FEATURE_INDEX_1
 245 # define index_arch_Fast_Unaligned_Load FEATURE_INDEX_1
 246 # define index_arch_Prefer_PMINUB_for_stringop FEATURE_INDEX_1
 247 # define index_arch_AVX_Usable          FEATURE_INDEX_1
 248 # define index_arch_FMA_Usable          FEATURE_INDEX_1
 249 # define index_arch_FMA4_Usable         FEATURE_INDEX_1
 250 # define index_arch_Slow_SSE4_2         FEATURE_INDEX_1
 251 # define index_arch_AVX2_Usable         FEATURE_INDEX_1
 252 # define index_arch_AVX_Fast_Unaligned_Load FEATURE_INDEX_1
 253 # define index_arch_AVX512F_Usable      FEATURE_INDEX_1
 254 # define index_arch_AVX512DQ_Usable     FEATURE_INDEX_1
 255 # define index_arch_I586                FEATURE_INDEX_1
 256 # define index_arch_I686                FEATURE_INDEX_1
 257 # define index_arch_Prefer_MAP_32BIT_EXEC FEATURE_INDEX_1
 258 # define index_arch_Prefer_No_VZEROUPPER FEATURE_INDEX_1
 259 # define index_arch_Fast_Unaligned_Copy FEATURE_INDEX_1
 260 # define index_arch_Prefer_ERMS         FEATURE_INDEX_1
 261 # define index_arch_Prefer_No_AVX512    FEATURE_INDEX_1
 262 # define index_arch_MathVec_Prefer_No_AVX512 FEATURE_INDEX_1
 263 # define index_arch_XSAVEC_Usable       FEATURE_INDEX_1
 264
 265 #endif  /* !__ASSEMBLER__ */
 266
 267 #ifdef __x86_64__
 268 # define HAS_CPUID 1
 269 #elif defined __i586__ || defined __pentium__
 270 # define HAS_CPUID 1
 271 # define HAS_I586 1
 272 # define HAS_I686 HAS_ARCH_FEATURE (I686)
 273 #elif (defined __i686__ || defined __pentiumpro__               \
 274        || defined __pentium4__ || defined __nocona__            \
 275        || defined __atom__ || defined __core2__                 \
 276        || defined __corei7__ || defined __corei7_avx__          \
 277        || defined __core_avx2__ || defined __nehalem__          \
 278        || defined __sandybridge__ || defined __haswell__        \
 279        || defined __knl__ || defined __bonnell__                \
 280        || defined __silvermont__                                \
 281        || defined __k6__ || defined __k8__                      \
 282        || defined __athlon__ || defined __amdfam10__            \
 283        || defined __bdver1__ || defined __bdver2__              \
 284        || defined __bdver3__ || defined __bdver4__              \
 285        || defined __btver1__ || defined __btver2__)
 286 # define HAS_CPUID 1
 287 # define HAS_I586 1
 288 # define HAS_I686 1
 289 #else
 290 # define HAS_CPUID 0
 291 # define HAS_I586 HAS_ARCH_FEATURE (I586)
 292 # define HAS_I686 HAS_ARCH_FEATURE (I686)
 293 #endif
 294
 295 #endif  /* cpu_features_h */