/* This file is part of the GNU C Library. Copyright (C) 2008-2015 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 . */ #define bit_Fast_Rep_String (1 << 0) #define bit_Fast_Copy_Backward (1 << 1) #define bit_Slow_BSF (1 << 2) #define bit_Fast_Unaligned_Load (1 << 4) #define bit_Prefer_PMINUB_for_stringop (1 << 5) #define bit_AVX_Usable (1 << 6) #define bit_FMA_Usable (1 << 7) #define bit_FMA4_Usable (1 << 8) #define bit_Slow_SSE4_2 (1 << 9) #define bit_AVX2_Usable (1 << 10) #define bit_AVX_Fast_Unaligned_Load (1 << 11) /* CPUID Feature flags. */ /* COMMON_CPUID_INDEX_1. */ #define bit_SSE2 (1 << 26) #define bit_SSSE3 (1 << 9) #define bit_SSE4_1 (1 << 19) #define bit_SSE4_2 (1 << 20) #define bit_OSXSAVE (1 << 27) #define bit_AVX (1 << 28) #define bit_POPCOUNT (1 << 23) #define bit_FMA (1 << 12) #define bit_FMA4 (1 << 16) /* COMMON_CPUID_INDEX_7. */ #define bit_RTM (1 << 11) #define bit_AVX2 (1 << 5) /* XCR0 Feature flags. */ #define bit_XMM_state (1 << 1) #define bit_YMM_state (2 << 1) /* 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 # define index_SSE2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET # define index_SSSE3 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET # define index_SSE4_1 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET # define index_SSE4_2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET # define index_AVX COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET # define index_AVX2 COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_OFFSET # define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE # define index_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE # define index_Slow_BSF FEATURE_INDEX_1*FEATURE_SIZE # define index_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE # define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1*FEATURE_SIZE # define index_AVX_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_FMA_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_FMA4_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_Slow_SSE4_2 FEATURE_INDEX_1*FEATURE_SIZE # define index_AVX2_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_AVX_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE #else /* __ASSEMBLER__ */ # include 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 }; extern 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]; } __cpu_features attribute_hidden; extern void __init_cpu_features (void) attribute_hidden; # define INIT_ARCH() \ do \ if (__cpu_features.kind == arch_kind_unknown) \ __init_cpu_features (); \ while (0) /* Used from outside libc.so to get access to the CPU features structure. */ extern const struct cpu_features *__get_cpu_features (void) __attribute__ ((const)); # if IS_IN (libc) # define __get_cpu_features() (&__cpu_features) # endif # define HAS_CPU_FEATURE(idx, reg, bit) \ ((__get_cpu_features ()->cpuid[idx].reg & (bit)) != 0) /* Following are the feature tests used throughout libc. */ /* CPUID_* evaluates to true if the feature flag is enabled. We always use &__cpu_features because the HAS_CPUID_* macros are called only within __init_cpu_features, where we can't call __get_cpu_features without infinite recursion. */ # define HAS_CPUID_FLAG(idx, reg, bit) \ (((&__cpu_features)->cpuid[idx].reg & (bit)) != 0) # define CPUID_OSXSAVE \ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_OSXSAVE) # define CPUID_AVX \ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_AVX) # define CPUID_FMA \ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_FMA) # define CPUID_FMA4 \ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_80000001, ecx, bit_FMA4) # define CPUID_RTM \ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_7, ebx, bit_RTM) # define CPUID_AVX2 \ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_7, ebx, bit_AVX2) /* HAS_* evaluates to true if we may use the feature at runtime. */ # define HAS_SSE2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, bit_SSE2) # define HAS_POPCOUNT HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_POPCOUNT) # define HAS_SSSE3 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSSE3) # define HAS_SSE4_1 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_1) # define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_2) # define HAS_RTM HAS_CPU_FEATURE (COMMON_CPUID_INDEX_7, ebx, bit_RTM) # define index_Fast_Rep_String FEATURE_INDEX_1 # define index_Fast_Copy_Backward FEATURE_INDEX_1 # define index_Slow_BSF FEATURE_INDEX_1 # define index_Fast_Unaligned_Load FEATURE_INDEX_1 # define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1 # define index_AVX_Usable FEATURE_INDEX_1 # define index_FMA_Usable FEATURE_INDEX_1 # define index_FMA4_Usable FEATURE_INDEX_1 # define index_Slow_SSE4_2 FEATURE_INDEX_1 # define index_AVX2_Usable FEATURE_INDEX_1 # define index_AVX_Fast_Unaligned_Load FEATURE_INDEX_1 # define HAS_ARCH_FEATURE(name) \ ((__get_cpu_features ()->feature[index_##name] & (bit_##name)) != 0) # define HAS_FAST_REP_STRING HAS_ARCH_FEATURE (Fast_Rep_String) # define HAS_FAST_COPY_BACKWARD HAS_ARCH_FEATURE (Fast_Copy_Backward) # define HAS_SLOW_BSF HAS_ARCH_FEATURE (Slow_BSF) # define HAS_FAST_UNALIGNED_LOAD HAS_ARCH_FEATURE (Fast_Unaligned_Load) # define HAS_AVX HAS_ARCH_FEATURE (AVX_Usable) # define HAS_AVX2 HAS_ARCH_FEATURE (AVX2_Usable) # define HAS_FMA HAS_ARCH_FEATURE (FMA_Usable) # define HAS_FMA4 HAS_ARCH_FEATURE (FMA4_Usable) # define HAS_AVX_FAST_UNALIGNED_LOAD HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load) #endif /* __ASSEMBLER__ */