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https://sourceware.org/git/glibc.git
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9620398097
Install <sys/platform/x86.h> so that programmers can do
#if __has_include(<sys/platform/x86.h>)
#include <sys/platform/x86.h>
#endif
...
if (CPU_FEATURE_USABLE (SSE2))
...
if (CPU_FEATURE_USABLE (AVX2))
...
<sys/platform/x86.h> exports only:
enum
{
COMMON_CPUID_INDEX_1 = 0,
COMMON_CPUID_INDEX_7,
COMMON_CPUID_INDEX_80000001,
COMMON_CPUID_INDEX_D_ECX_1,
COMMON_CPUID_INDEX_80000007,
COMMON_CPUID_INDEX_80000008,
COMMON_CPUID_INDEX_7_ECX_1,
/* Keep the following line at the end. */
COMMON_CPUID_INDEX_MAX
};
struct cpuid_features
{
struct cpuid_registers cpuid;
struct cpuid_registers usable;
};
struct cpu_features
{
struct cpu_features_basic basic;
struct cpuid_features features[COMMON_CPUID_INDEX_MAX];
};
/* Get a pointer to the CPU features structure. */
extern const struct cpu_features *__x86_get_cpu_features
(unsigned int max) __attribute__ ((const));
Since all feature checks are done through macros, programs compiled with
a newer <sys/platform/x86.h> are compatible with the older glibc binaries
as long as the layout of struct cpu_features is identical. The features
array can be expanded with backward binary compatibility for both .o and
.so files. When COMMON_CPUID_INDEX_MAX is increased to support new
processor features, __x86_get_cpu_features in the older glibc binaries
returns NULL and HAS_CPU_FEATURE/CPU_FEATURE_USABLE return false on the
new processor feature. No new symbol version is neeeded.
Both CPU_FEATURE_USABLE and HAS_CPU_FEATURE are provided. HAS_CPU_FEATURE
can be used to identify processor features.
Note: Although GCC has __builtin_cpu_supports, it only supports a subset
of <sys/platform/x86.h> and it is equivalent to CPU_FEATURE_USABLE. It
doesn't support HAS_CPU_FEATURE.
52 lines
2.0 KiB
Makefile
52 lines
2.0 KiB
Makefile
ifeq ($(subdir),string)
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gen-as-const-headers += locale-defines.sym
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sysdep_routines += bzero-sse2 memset-sse2 memcpy-ssse3 mempcpy-ssse3 \
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memmove-ssse3 memcpy-ssse3-rep mempcpy-ssse3-rep \
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memmove-ssse3-rep bcopy-ssse3 bcopy-ssse3-rep \
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memset-sse2-rep bzero-sse2-rep strcmp-ssse3 \
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strcmp-sse4 strncmp-c strncmp-ssse3 strncmp-sse4 \
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memcmp-ssse3 memcmp-sse4 varshift \
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strlen-sse2 strlen-sse2-bsf strncpy-c strcpy-ssse3 \
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strncpy-ssse3 stpcpy-ssse3 stpncpy-ssse3 strcpy-sse2 \
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strncpy-sse2 stpcpy-sse2 stpncpy-sse2 strcat-ssse3 \
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strcat-sse2 strncat-ssse3 strncat-sse2 strncat-c \
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strchr-sse2 strrchr-sse2 strchr-sse2-bsf strrchr-sse2-bsf \
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memchr-sse2 memchr-sse2-bsf \
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memrchr-sse2 memrchr-sse2-bsf memrchr-c \
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rawmemchr-sse2 rawmemchr-sse2-bsf \
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strnlen-sse2 strnlen-c \
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strcasecmp_l-c strcasecmp-c strcasecmp_l-ssse3 \
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strncase_l-c strncase-c strncase_l-ssse3 \
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strcasecmp_l-sse4 strncase_l-sse4 \
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bcopy-sse2-unaligned memcpy-sse2-unaligned \
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mempcpy-sse2-unaligned memmove-sse2-unaligned \
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strcspn-c strpbrk-c strspn-c \
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bcopy-ia32 bzero-ia32 rawmemchr-ia32 \
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memchr-ia32 memcmp-ia32 memcpy-ia32 memmove-ia32 \
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mempcpy-ia32 memset-ia32 strcat-ia32 strchr-ia32 \
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strrchr-ia32 strcpy-ia32 strcmp-ia32 strcspn-ia32 \
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strpbrk-ia32 strspn-ia32 strlen-ia32 stpcpy-ia32 \
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stpncpy-ia32
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CFLAGS-varshift.c += -msse4
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CFLAGS-strcspn-c.c += -msse4
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CFLAGS-strpbrk-c.c += -msse4
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CFLAGS-strspn-c.c += -msse4
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endif
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ifeq ($(subdir),wcsmbs)
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sysdep_routines += wcscmp-sse2 wcscmp-c wcslen-sse2 wcslen-c \
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wmemcmp-sse4 wmemcmp-ssse3 wmemcmp-c wcschr-sse2 \
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wcschr-c wcsrchr-sse2 wcsrchr-c wcscpy-ssse3 wcscpy-c
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endif
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ifeq ($(subdir),math)
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libm-sysdep_routines += s_fma-fma s_fmaf-fma
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CFLAGS-s_fma-fma.c += -mavx -mfpmath=sse
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CFLAGS-s_fmaf-fma.c += -mavx -mfpmath=sse
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endif
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ifeq ($(subdir),debug)
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sysdep_routines += memcpy_chk-nonshared mempcpy_chk-nonshared \
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memmove_chk-nonshared memset_chk-nonshared
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endif
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