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/* Data structure for x86 CPU features.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#ifndef _PRIVATE_CPU_FEATURES_H
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#define _PRIVATE_CPU_FEATURES_H 1
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#ifdef _CPU_FEATURES_H
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# error this should be impossible
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#endif
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#ifndef _ISOMAC
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/* Get most of the contents from the public header, but we define a
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different `struct cpu_features' type for private use. */
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# define cpu_features cpu_features_public
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# define __x86_get_cpu_features __x86_get_cpu_features_public
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#endif
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#include <sysdeps/x86/sys/platform/x86.h>
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#ifndef _ISOMAC
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# undef cpu_features
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# undef __x86_get_cpu_features
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# define __get_cpu_features() __x86_get_cpu_features (0)
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enum
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{
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/* The integer bit array index for the first set of preferred feature
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bits. */
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PREFERRED_FEATURE_INDEX_1 = 0,
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/* The current maximum size of the feature integer bit array. */
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PREFERRED_FEATURE_INDEX_MAX
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};
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/* Only used directly in cpu-features.c. */
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# define CPU_FEATURE_SET(ptr, name) \
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ptr->features[index_cpu_##name].usable.reg_##name |= bit_cpu_##name;
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# define CPU_FEATURE_UNSET(ptr, name) \
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ptr->features[index_cpu_##name].usable.reg_##name &= ~bit_cpu_##name;
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# define CPU_FEATURE_SET_USABLE(ptr, name) \
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ptr->features[index_cpu_##name].usable.reg_##name \
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|= ptr->features[index_cpu_##name].cpuid.reg_##name & bit_cpu_##name;
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# define CPU_FEATURE_PREFERRED_P(ptr, name) \
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((ptr->preferred[index_arch_##name] & bit_arch_##name) != 0)
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# define CPU_FEATURE_CPU_P(ptr, name) \
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CPU_FEATURE_CHECK_P (ptr, name, cpuid)
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/* HAS_CPU_FEATURE evaluates to true if CPU supports the feature. */
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# undef HAS_CPU_FEATURE
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# define HAS_CPU_FEATURE(name) \
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CPU_FEATURE_CPU_P (__x86_get_cpu_features (0), name)
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/* CPU_FEATURE_USABLE evaluates to true if the feature is usable. */
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# undef CPU_FEATURE_USABLE
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# define CPU_FEATURE_USABLE(name) \
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CPU_FEATURE_USABLE_P (__x86_get_cpu_features (0), name)
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/* CPU_FEATURE_PREFER evaluates to true if we prefer the feature at
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runtime. */
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# define CPU_FEATURE_PREFERRED(name) \
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CPU_FEATURE_PREFERRED_P(__get_cpu_features (), name)
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# define CPU_FEATURES_CPU_P(ptr, name) \
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CPU_FEATURE_CPU_P (ptr, name)
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# define CPU_FEATURES_ARCH_P(ptr, name) \
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CPU_FEATURE_PREFERRED_P (ptr, name)
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# define HAS_ARCH_FEATURE(name) \
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CPU_FEATURE_PREFERRED (name)
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/* PREFERRED_FEATURE_INDEX_1. */
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# define bit_arch_I586 (1u << 0)
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# define bit_arch_I686 (1u << 1)
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# define bit_arch_Fast_Rep_String (1u << 2)
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# define bit_arch_Fast_Copy_Backward (1u << 3)
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# define bit_arch_Fast_Unaligned_Load (1u << 4)
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# define bit_arch_Fast_Unaligned_Copy (1u << 5)
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# define bit_arch_Slow_BSF (1u << 6)
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# define bit_arch_Slow_SSE4_2 (1u << 7)
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# define bit_arch_AVX_Fast_Unaligned_Load (1u << 8)
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# define bit_arch_Prefer_MAP_32BIT_EXEC (1u << 9)
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# define bit_arch_Prefer_PMINUB_for_stringop (1u << 10)
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# define bit_arch_Prefer_No_VZEROUPPER (1u << 11)
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# define bit_arch_Prefer_ERMS (1u << 12)
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# define bit_arch_Prefer_FSRM (1u << 13)
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# define bit_arch_Prefer_No_AVX512 (1u << 14)
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# define bit_arch_MathVec_Prefer_No_AVX512 (1u << 15)
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# define index_arch_Fast_Rep_String PREFERRED_FEATURE_INDEX_1
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# define index_arch_Fast_Copy_Backward PREFERRED_FEATURE_INDEX_1
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# define index_arch_Slow_BSF PREFERRED_FEATURE_INDEX_1
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# define index_arch_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1
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# define index_arch_Prefer_PMINUB_for_stringop PREFERRED_FEATURE_INDEX_1
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# define index_arch_Fast_Unaligned_Copy PREFERRED_FEATURE_INDEX_1
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# define index_arch_I586 PREFERRED_FEATURE_INDEX_1
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# define index_arch_I686 PREFERRED_FEATURE_INDEX_1
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# define index_arch_Slow_SSE4_2 PREFERRED_FEATURE_INDEX_1
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# define index_arch_AVX_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1
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# define index_arch_Prefer_MAP_32BIT_EXEC PREFERRED_FEATURE_INDEX_1
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# define index_arch_Prefer_No_VZEROUPPER PREFERRED_FEATURE_INDEX_1
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# define index_arch_Prefer_ERMS PREFERRED_FEATURE_INDEX_1
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# define index_arch_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1
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# define index_arch_MathVec_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1
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# define index_arch_Prefer_FSRM PREFERRED_FEATURE_INDEX_1
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/* XCR0 Feature flags. */
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# define bit_XMM_state (1u << 1)
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# define bit_YMM_state (1u << 2)
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# define bit_Opmask_state (1u << 5)
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# define bit_ZMM0_15_state (1u << 6)
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# define bit_ZMM16_31_state (1u << 7)
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# define bit_XTILECFG_state (1u << 17)
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# define bit_XTILEDATA_state (1u << 18)
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struct cpu_features
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{
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struct cpu_features_basic basic;
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struct cpuid_features features[COMMON_CPUID_INDEX_MAX];
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unsigned int preferred[PREFERRED_FEATURE_INDEX_MAX];
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/* The state size for XSAVEC or XSAVE. The type must be unsigned long
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int so that we use
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sub xsave_state_size_offset(%rip) %RSP_LP
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in _dl_runtime_resolve. */
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unsigned long int xsave_state_size;
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/* The full state size for XSAVE when XSAVEC is disabled by
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GLIBC_TUNABLES=glibc.cpu.hwcaps=-XSAVEC
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*/
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unsigned int xsave_state_full_size;
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/* Data cache size for use in memory and string routines, typically
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L1 size. */
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unsigned long int data_cache_size;
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/* Shared cache size for use in memory and string routines, typically
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L2 or L3 size. */
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unsigned long int shared_cache_size;
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/* Threshold to use non temporal store. */
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unsigned long int non_temporal_threshold;
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/* Threshold to use "rep movsb". */
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unsigned long int rep_movsb_threshold;
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/* Threshold to use "rep stosb". */
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unsigned long int rep_stosb_threshold;
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};
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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 __x86_get_cpu_features(max) (&GLRO(dl_x86_cpu_features))
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extern void _dl_x86_init_cpu_features (void) attribute_hidden;
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# endif
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# ifdef __x86_64__
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# define HAS_CPUID 1
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# elif (defined __i586__ || defined __pentium__ \
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|| defined __geode__ || defined __k6__)
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# define HAS_CPUID 1
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# define HAS_I586 1
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# define HAS_I686 HAS_ARCH_FEATURE (I686)
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# elif defined __i486__
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# define HAS_CPUID 0
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# define HAS_I586 HAS_ARCH_FEATURE (I586)
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# define HAS_I686 HAS_ARCH_FEATURE (I686)
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# else
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# define HAS_CPUID 1
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# define HAS_I586 1
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# define HAS_I686 1
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# endif
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#endif /* !_ISOMAC */
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#endif /* include/cpu-features.h */
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