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179 lines
6.0 KiB
C
179 lines
6.0 KiB
C
/* This file is part of the GNU C Library.
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Copyright (C) 2008-2013 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#define bit_Fast_Rep_String (1 << 0)
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#define bit_Fast_Copy_Backward (1 << 1)
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#define bit_Slow_BSF (1 << 2)
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#define bit_Fast_Unaligned_Load (1 << 4)
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#define bit_Prefer_PMINUB_for_stringop (1 << 5)
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#define bit_AVX_Usable (1 << 6)
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#define bit_FMA_Usable (1 << 7)
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#define bit_FMA4_Usable (1 << 8)
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#define bit_Slow_SSE4_2 (1 << 9)
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/* CPUID Feature flags. */
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/* COMMON_CPUID_INDEX_1. */
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#define bit_SSE2 (1 << 26)
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#define bit_SSSE3 (1 << 9)
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#define bit_SSE4_1 (1 << 19)
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#define bit_SSE4_2 (1 << 20)
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#define bit_OSXSAVE (1 << 27)
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#define bit_AVX (1 << 28)
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#define bit_POPCOUNT (1 << 23)
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#define bit_FMA (1 << 12)
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#define bit_FMA4 (1 << 16)
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/* COMMON_CPUID_INDEX_7. */
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#define bit_RTM (1 << 11)
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/* XCR0 Feature flags. */
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#define bit_XMM_state (1 << 1)
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#define bit_YMM_state (2 << 1)
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#ifdef __ASSEMBLER__
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# include <ifunc-defines.h>
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# define index_SSE2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET
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# define index_SSSE3 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
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# define index_SSE4_1 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
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# define index_SSE4_2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
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# define index_AVX COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
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# define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE
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# define index_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE
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# define index_Slow_BSF FEATURE_INDEX_1*FEATURE_SIZE
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# define index_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE
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# define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1*FEATURE_SIZE
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# define index_AVX_Usable FEATURE_INDEX_1*FEATURE_SIZE
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# define index_FMA_Usable FEATURE_INDEX_1*FEATURE_SIZE
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# define index_FMA4_Usable FEATURE_INDEX_1*FEATURE_SIZE
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# define index_Slow_SSE4_2 FEATURE_INDEX_1*FEATURE_SIZE
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#else /* __ASSEMBLER__ */
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# include <sys/param.h>
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enum
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{
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COMMON_CPUID_INDEX_1 = 0,
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COMMON_CPUID_INDEX_7,
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COMMON_CPUID_INDEX_80000001, /* for AMD */
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/* Keep the following line at the end. */
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COMMON_CPUID_INDEX_MAX
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};
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enum
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{
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FEATURE_INDEX_1 = 0,
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/* Keep the following line at the end. */
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FEATURE_INDEX_MAX
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};
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extern struct cpu_features
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{
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enum cpu_features_kind
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{
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arch_kind_unknown = 0,
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arch_kind_intel,
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arch_kind_amd,
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arch_kind_other
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} kind;
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int max_cpuid;
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struct cpuid_registers
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{
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unsigned int eax;
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unsigned int ebx;
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unsigned int ecx;
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unsigned int edx;
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} cpuid[COMMON_CPUID_INDEX_MAX];
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unsigned int family;
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unsigned int model;
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unsigned int feature[FEATURE_INDEX_MAX];
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} __cpu_features attribute_hidden;
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extern void __init_cpu_features (void) attribute_hidden;
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# define INIT_ARCH() \
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do \
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if (__cpu_features.kind == arch_kind_unknown) \
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__init_cpu_features (); \
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while (0)
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/* Used from outside libc.so to get access to the CPU features structure. */
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extern const struct cpu_features *__get_cpu_features (void)
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__attribute__ ((const));
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# ifndef NOT_IN_libc
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# define __get_cpu_features() (&__cpu_features)
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# endif
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# define HAS_CPU_FEATURE(idx, reg, bit) \
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((__get_cpu_features ()->cpuid[idx].reg & (bit)) != 0)
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/* Following are the feature tests used throughout libc. */
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/* CPUID_* evaluates to true if the feature flag is enabled.
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We always use &__cpu_features because the HAS_CPUID_* macros
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are called only within __init_cpu_features, where we can't
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call __get_cpu_features without infinite recursion. */
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# define HAS_CPUID_FLAG(idx, reg, bit) \
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(((&__cpu_features)->cpuid[idx].reg & (bit)) != 0)
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# define CPUID_OSXSAVE \
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HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_OSXSAVE)
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# define CPUID_AVX \
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HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_AVX)
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# define CPUID_FMA \
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HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_FMA)
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# define CPUID_FMA4 \
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HAS_CPUID_FLAG (COMMON_CPUID_INDEX_80000001, ecx, bit_FMA4)
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# define CPUID_RTM \
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HAS_CPUID_FLAG (COMMON_CPUID_INDEX_7, ebx, bit_RTM)
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/* HAS_* evaluates to true if we may use the feature at runtime. */
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# define HAS_SSE2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, bit_SSE2)
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# define HAS_POPCOUNT HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_POPCOUNT)
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# define HAS_SSSE3 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSSE3)
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# define HAS_SSE4_1 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_1)
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# define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_2)
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# define HAS_RTM HAS_CPU_FEATURE (COMMON_CPUID_INDEX_7, ebx, bit_RTM)
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# define index_Fast_Rep_String FEATURE_INDEX_1
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# define index_Fast_Copy_Backward FEATURE_INDEX_1
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# define index_Slow_BSF FEATURE_INDEX_1
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# define index_Fast_Unaligned_Load FEATURE_INDEX_1
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# define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1
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# define index_AVX_Usable FEATURE_INDEX_1
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# define index_FMA_Usable FEATURE_INDEX_1
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# define index_FMA4_Usable FEATURE_INDEX_1
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# define index_Slow_SSE4_2 FEATURE_INDEX_1
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# define HAS_ARCH_FEATURE(name) \
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((__get_cpu_features ()->feature[index_##name] & (bit_##name)) != 0)
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# define HAS_FAST_REP_STRING HAS_ARCH_FEATURE (Fast_Rep_String)
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# define HAS_FAST_COPY_BACKWARD HAS_ARCH_FEATURE (Fast_Copy_Backward)
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# define HAS_SLOW_BSF HAS_ARCH_FEATURE (Slow_BSF)
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# define HAS_FAST_UNALIGNED_LOAD HAS_ARCH_FEATURE (Fast_Unaligned_Load)
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# define HAS_AVX HAS_ARCH_FEATURE (AVX_Usable)
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# define HAS_FMA HAS_ARCH_FEATURE (FMA_Usable)
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# define HAS_FMA4 HAS_ARCH_FEATURE (FMA4_Usable)
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#endif /* __ASSEMBLER__ */
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