241 lines
8.0 KiB
C
241 lines
8.0 KiB
C
/* This file is part of the GNU C Library.
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Copyright (C) 2008-2015 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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#ifndef cpu_features_h
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#define cpu_features_h
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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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#define bit_AVX2_Usable (1 << 10)
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#define bit_AVX_Fast_Unaligned_Load (1 << 11)
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#define bit_AVX512F_Usable (1 << 12)
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#define bit_AVX512DQ_Usable (1 << 13)
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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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#define bit_AVX2 (1 << 5)
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#define bit_AVX512F (1 << 16)
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#define bit_AVX512DQ (1 << 17)
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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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#define bit_Opmask_state (1 << 5)
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#define bit_ZMM0_15_state (1 << 6)
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#define bit_ZMM16_31_state (1 << 7)
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/* The integer bit array index for the first set of internal feature bits. */
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#define FEATURE_INDEX_1 0
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/* The current maximum size of the feature integer bit array. */
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#define FEATURE_INDEX_MAX 1
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#ifdef __ASSEMBLER__
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# include <ifunc-defines.h>
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# include <rtld-global-offsets.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_AVX2 COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_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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# define index_AVX2_Usable FEATURE_INDEX_1*FEATURE_SIZE
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# define index_AVX_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE
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# define index_AVX512F_Usable FEATURE_INDEX_1*FEATURE_SIZE
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# define index_AVX512DQ_Usable FEATURE_INDEX_1*FEATURE_SIZE
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# if defined (_LIBC) && !IS_IN (nonlib)
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# ifdef __x86_64__
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# ifdef SHARED
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# if IS_IN (rtld)
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# define LOAD_RTLD_GLOBAL_RO_RDX
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# define HAS_FEATURE(offset, name) \
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testl $(bit_##name), _rtld_local_ro+offset+(index_##name)(%rip)
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# else
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# define LOAD_RTLD_GLOBAL_RO_RDX \
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mov _rtld_global_ro@GOTPCREL(%rip), %RDX_LP
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# define HAS_FEATURE(offset, name) \
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testl $(bit_##name), \
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RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+offset+(index_##name)(%rdx)
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# endif
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# else /* SHARED */
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# define LOAD_RTLD_GLOBAL_RO_RDX
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# define HAS_FEATURE(offset, name) \
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testl $(bit_##name), _dl_x86_cpu_features+offset+(index_##name)(%rip)
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# endif /* !SHARED */
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# else /* __x86_64__ */
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# ifdef SHARED
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# define LOAD_FUNC_GOT_EAX(func) \
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leal func@GOTOFF(%edx), %eax
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# if IS_IN (rtld)
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# define LOAD_GOT_AND_RTLD_GLOBAL_RO \
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LOAD_PIC_REG(dx)
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# define HAS_FEATURE(offset, name) \
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testl $(bit_##name), offset+(index_##name)+_rtld_local_ro@GOTOFF(%edx)
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# else
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# define LOAD_GOT_AND_RTLD_GLOBAL_RO \
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LOAD_PIC_REG(dx); \
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mov _rtld_global_ro@GOT(%edx), %ecx
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# define HAS_FEATURE(offset, name) \
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testl $(bit_##name), \
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RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+offset+(index_##name)(%ecx)
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# endif
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# else /* SHARED */
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# define LOAD_FUNC_GOT_EAX(func) \
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leal func, %eax
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# define LOAD_GOT_AND_RTLD_GLOBAL_RO
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# define HAS_FEATURE(offset, name) \
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testl $(bit_##name), _dl_x86_cpu_features+offset+(index_##name)
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# endif /* !SHARED */
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# endif /* !__x86_64__ */
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# else /* _LIBC && !nonlib */
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# error "Sorry, <cpu-features.h> is unimplemented for assembler"
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# endif /* !_LIBC || nonlib */
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/* HAS_* evaluates to true if we may use the feature at runtime. */
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# define HAS_CPU_FEATURE(name) HAS_FEATURE (CPUID_OFFSET, name)
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# define HAS_ARCH_FEATURE(name) HAS_FEATURE (FEATURE_OFFSET, name)
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#else /* __ASSEMBLER__ */
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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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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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};
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/* Used from outside of glibc to get access to the CPU features
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structure. */
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extern const struct cpu_features *__get_cpu_features (void)
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__attribute__ ((const));
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# if defined (_LIBC) && !IS_IN (nonlib)
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/* Unused for x86. */
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# define INIT_ARCH()
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# define __get_cpu_features() (&GLRO(dl_x86_cpu_features))
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# endif
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/* HAS_* evaluates to true if we may use the feature at runtime. */
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# define HAS_CPU_FEATURE(name) \
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((__get_cpu_features ()->cpuid[index_##name].reg_##name & (bit_##name)) != 0)
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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 index_SSE2 COMMON_CPUID_INDEX_1
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# define index_SSSE3 COMMON_CPUID_INDEX_1
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# define index_SSE4_1 COMMON_CPUID_INDEX_1
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# define index_SSE4_2 COMMON_CPUID_INDEX_1
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# define index_AVX COMMON_CPUID_INDEX_1
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# define index_AVX2 COMMON_CPUID_INDEX_7
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# define index_AVX512F COMMON_CPUID_INDEX_7
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# define index_AVX512DQ COMMON_CPUID_INDEX_7
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# define index_RTM COMMON_CPUID_INDEX_7
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# define index_FMA COMMON_CPUID_INDEX_1
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# define index_FMA4 COMMON_CPUID_INDEX_80000001
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# define index_POPCOUNT COMMON_CPUID_INDEX_1
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# define index_OSXSAVE COMMON_CPUID_INDEX_1
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# define reg_SSE2 edx
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# define reg_SSSE3 ecx
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# define reg_SSE4_1 ecx
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# define reg_SSE4_2 ecx
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# define reg_AVX ecx
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# define reg_AVX2 ebx
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# define reg_AVX512F ebx
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# define reg_AVX512DQ ebx
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# define reg_RTM ebx
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# define reg_FMA ecx
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# define reg_FMA4 ecx
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# define reg_POPCOUNT ecx
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# define reg_OSXSAVE ecx
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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 index_AVX2_Usable FEATURE_INDEX_1
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# define index_AVX_Fast_Unaligned_Load FEATURE_INDEX_1
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# define index_AVX512F_Usable FEATURE_INDEX_1
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# define index_AVX512DQ_Usable FEATURE_INDEX_1
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#endif /* !__ASSEMBLER__ */
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#endif /* cpu_features_h */
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