mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-27 03:41:23 +08:00
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.
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|---|---|---|
| .. | ||
| bcopy.S | ||
| ifunc-avx2.h | ||
| ifunc-impl-list.c | ||
| ifunc-memcmp.h | ||
| ifunc-memmove.h | ||
| ifunc-memset.h | ||
| ifunc-sse4_2.h | ||
| ifunc-strcasecmp.h | ||
| ifunc-strcpy.h | ||
| ifunc-wmemset.h | ||
| Makefile | ||
| memchr-avx2.S | ||
| memchr-sse2.S | ||
| memchr.c | ||
| memcmp-avx2-movbe.S | ||
| memcmp-sse2.S | ||
| memcmp-sse4.S | ||
| memcmp-ssse3.S | ||
| memcmp.c | ||
| memcpy_chk-nonshared.S | ||
| memcpy_chk.c | ||
| memcpy-ssse3-back.S | ||
| memcpy-ssse3.S | ||
| memcpy.c | ||
| memmove_chk-nonshared.S | ||
| memmove_chk.c | ||
| memmove-avx512-no-vzeroupper.S | ||
| memmove-avx512-unaligned-erms.S | ||
| memmove-avx-unaligned-erms.S | ||
| memmove-sse2-unaligned-erms.S | ||
| memmove-ssse3-back.S | ||
| memmove-ssse3.S | ||
| memmove-vec-unaligned-erms.S | ||
| memmove.c | ||
| mempcpy_chk-nonshared.S | ||
| mempcpy_chk.c | ||
| mempcpy.c | ||
| memrchr-avx2.S | ||
| memrchr-sse2.S | ||
| memrchr.c | ||
| memset_chk-nonshared.S | ||
| memset_chk.c | ||
| memset-avx2-unaligned-erms.S | ||
| memset-avx512-no-vzeroupper.S | ||
| memset-avx512-unaligned-erms.S | ||
| memset-sse2-unaligned-erms.S | ||
| memset-vec-unaligned-erms.S | ||
| memset.c | ||
| rawmemchr-avx2.S | ||
| rawmemchr-sse2.S | ||
| rawmemchr.c | ||
| sched_cpucount.c | ||
| stpcpy-avx2.S | ||
| stpcpy-sse2-unaligned.S | ||
| stpcpy-sse2.S | ||
| stpcpy-ssse3.S | ||
| stpcpy.c | ||
| stpncpy-avx2.S | ||
| stpncpy-c.c | ||
| stpncpy-sse2-unaligned.S | ||
| stpncpy-ssse3.S | ||
| stpncpy.c | ||
| strcasecmp_l-avx.S | ||
| strcasecmp_l-sse2.S | ||
| strcasecmp_l-sse4_2.S | ||
| strcasecmp_l-ssse3.S | ||
| strcasecmp_l.c | ||
| strcasecmp.c | ||
| strcat-avx2.S | ||
| strcat-sse2-unaligned.S | ||
| strcat-sse2.S | ||
| strcat-ssse3.S | ||
| strcat.c | ||
| strchr-avx2.S | ||
| strchr-sse2-no-bsf.S | ||
| strchr-sse2.S | ||
| strchr.c | ||
| strchrnul-avx2.S | ||
| strchrnul-sse2.S | ||
| strchrnul.c | ||
| strcmp-avx2.S | ||
| strcmp-sse2-unaligned.S | ||
| strcmp-sse2.S | ||
| strcmp-sse4_2.S | ||
| strcmp-sse42.S | ||
| strcmp-ssse3.S | ||
| strcmp.c | ||
| strcpy-avx2.S | ||
| strcpy-sse2-unaligned.S | ||
| strcpy-sse2.S | ||
| strcpy-ssse3.S | ||
| strcpy.c | ||
| strcspn-c.c | ||
| strcspn-sse2.S | ||
| strcspn.c | ||
| strlen-avx2.S | ||
| strlen-sse2.S | ||
| strlen.c | ||
| strncase_l-avx.S | ||
| strncase_l-sse2.S | ||
| strncase_l-sse4_2.S | ||
| strncase_l-ssse3.S | ||
| strncase_l.c | ||
| strncase.c | ||
| strncat-avx2.S | ||
| strncat-c.c | ||
| strncat-sse2-unaligned.S | ||
| strncat-ssse3.S | ||
| strncat.c | ||
| strncmp-avx2.S | ||
| strncmp-sse2.S | ||
| strncmp-sse4_2.S | ||
| strncmp-ssse3.S | ||
| strncmp.c | ||
| strncpy-avx2.S | ||
| strncpy-c.c | ||
| strncpy-sse2-unaligned.S | ||
| strncpy-ssse3.S | ||
| strncpy.c | ||
| strnlen-avx2.S | ||
| strnlen-sse2.S | ||
| strnlen.c | ||
| strpbrk-c.c | ||
| strpbrk-sse2.S | ||
| strpbrk.c | ||
| strrchr-avx2.S | ||
| strrchr-sse2.S | ||
| strrchr.c | ||
| strspn-c.c | ||
| strspn-sse2.S | ||
| strspn.c | ||
| strstr-sse2-unaligned.S | ||
| strstr.c | ||
| varshift.c | ||
| varshift.h | ||
| wcschr-avx2.S | ||
| wcschr-sse2.S | ||
| wcschr.c | ||
| wcscmp-avx2.S | ||
| wcscmp-sse2.S | ||
| wcscmp.c | ||
| wcscpy-c.c | ||
| wcscpy-ssse3.S | ||
| wcscpy.c | ||
| wcslen-avx2.S | ||
| wcslen-sse2.S | ||
| wcslen.c | ||
| wcsncmp-avx2.S | ||
| wcsncmp-sse2.c | ||
| wcsncmp.c | ||
| wcsnlen-avx2.S | ||
| wcsnlen-c.c | ||
| wcsnlen-sse4_1.S | ||
| wcsnlen.c | ||
| wcsrchr-avx2.S | ||
| wcsrchr-sse2.S | ||
| wcsrchr.c | ||
| wmemchr-avx2.S | ||
| wmemchr-sse2.S | ||
| wmemchr.c | ||
| wmemcmp-avx2-movbe.S | ||
| wmemcmp-c.c | ||
| wmemcmp-sse4.S | ||
| wmemcmp-ssse3.S | ||
| wmemcmp.c | ||
| wmemset_chk-nonshared.S | ||
| wmemset_chk.c | ||
| wmemset.c | ||