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glibc/sysdeps/x86/cpu-features.h
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| /* 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) | |
| /* 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) | |
| /* COMMON_CPUID_INDEX_7. */ | |
| #define bit_cpu_RTM (1 << 11) | |
| #define bit_cpu_AVX2 (1 << 5) | |
| #define bit_cpu_AVX512F (1 << 16) | |
| #define bit_cpu_AVX512DQ (1 << 17) | |
| /* 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 | |
| #ifdef __ASSEMBLER__ | |
| # include <ifunc-defines.h> | |
| # include <rtld-global-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_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 | |
| # 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; | |
| 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_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 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_RTM ebx | |
| # define reg_FMA ecx | |
| # define reg_FMA4 ecx | |
| # define reg_POPCOUNT ecx | |
| # define reg_OSXSAVE ecx | |
| # 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 | |
| #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 */ |