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/* This file is part of the GNU C Library.
Copyright (C) 2008, 2009, 2010 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#define bit_Fast_Rep_String (1 << 0)
#define bit_Fast_Copy_Backward (1 << 1)
#define bit_Slow_BSF (1 << 2)
#define bit_Prefer_SSE_for_memop (1 << 3)
#ifdef __ASSEMBLER__
# include <ifunc-defines.h>
# define bit_SSE2 (1 << 26)
# define bit_SSSE3 (1 << 9)
# define bit_SSE4_1 (1 << 19)
# define bit_SSE4_2 (1 << 20)
# 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_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_Prefer_SSE_for_memop FEATURE_INDEX_1*FEATURE_SIZE
#else /* __ASSEMBLER__ */
# include <sys/param.h>
enum
{
COMMON_CPUID_INDEX_1 = 0,
/* Keep the following line at the end. */
COMMON_CPUID_INDEX_MAX
};
enum
{
FEATURE_INDEX_1 = 0,
/* Keep the following line at the end. */
FEATURE_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));
# ifndef NOT_IN_libc
# define __get_cpu_features() (&__cpu_features)
# endif
# define HAS_CPU_FEATURE(idx, reg, bit) \
((__get_cpu_features ()->cpuid[idx].reg & (1 << (bit))) != 0)
/* Following are the feature tests used throughout libc. */
# define HAS_SSE2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, 26)
# define HAS_POPCOUNT HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 23)
# define HAS_SSSE3 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 9)
# define HAS_SSE4_1 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 19)
# define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 20)
# define HAS_FMA HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 12)
# 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_Prefer_SSE_for_memop FEATURE_INDEX_1
#define HAS_ARCH_FEATURE(idx, bit) \
((__get_cpu_features ()->feature[idx] & (bit)) != 0)
#define HAS_FAST_REP_STRING \
HAS_ARCH_FEATURE (index_Fast_Rep_String, bit_Fast_Rep_String)
#define HAS_FAST_COPY_BACKWARD \
HAS_ARCH_FEATURE (index_Fast_Copy_Backward, bit_Fast_Copy_Backward)
#define HAS_SLOW_BSF \
HAS_ARCH_FEATURE (index_Slow_BSF, bit_Slow_BSF)
#define HAS_PREFER_SSE_FOR_MEMOP \
HAS_ARCH_FEATURE (index_Prefer_SSE_for_memop, bit_Prefer_SSE_for_memop)
#endif /* __ASSEMBLER__ */
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