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126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* This file is part of the GNU C Library.
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Copyright (C) 2008, 2009, 2010 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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#ifdef __ASSEMBLER__
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# include <ifunc-defines.h>
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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 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_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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#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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/* 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 & (1 << (bit))) != 0)
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/* Following are the feature tests used throughout libc. */
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# define HAS_SSE2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, 26)
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# define HAS_POPCOUNT HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 23)
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# define HAS_SSSE3 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 9)
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# define HAS_SSE4_1 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 19)
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# define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 20)
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# define HAS_FMA HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 12)
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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 HAS_ARCH_FEATURE(idx, bit) \
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((__get_cpu_features ()->feature[idx] & (bit)) != 0)
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#define HAS_FAST_REP_STRING \
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HAS_ARCH_FEATURE (index_Fast_Rep_String, bit_Fast_Rep_String)
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#define HAS_FAST_COPY_BACKWARD \
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HAS_ARCH_FEATURE (index_Fast_Copy_Backward, bit_Fast_Copy_Backward)
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#define HAS_SLOW_BSF \
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HAS_ARCH_FEATURE (index_Slow_BSF, bit_Slow_BSF)
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#endif /* __ASSEMBLER__ */
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