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| author | Sihai Yao <sihai.ysh@alibaba-inc.com> | 2014-04-17 08:00:21 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-04-17 08:00:21 -0700 |
| commit | f9281df9955fdd11799041ebebd7dc6e4870449a (patch) | |
| tree | bfd7b1a7e35688d8d0bd6ef90dc84dbe3fb641aa /sysdeps/x86_64 | |
| parent | 7c6776620db8e48fca492dbcac88d1c0f239dcde (diff) | |
| download | glibc-f9281df9955fdd11799041ebebd7dc6e4870449a.tar.gz glibc-f9281df9955fdd11799041ebebd7dc6e4870449a.tar.xz glibc-f9281df9955fdd11799041ebebd7dc6e4870449a.zip | |
Detect if AVX2 is usable
This patch checks and sets bit_AVX2_Usable in __cpu_features.feature. * sysdeps/x86_64/multiarch/ifunc-defines.sym (COMMON_CPUID_INDEX_7): New. * sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): Check and set bit_AVX2_Usable. * sysdeps/x86_64/multiarch/init-arch.h (bit_AVX2_Usable): New macro. (bit_AVX2): Likewise. (index_AVX2_Usable): Likewise. (CPUID_AVX2): Likewise. (HAS_AVX2): Likewise.
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-defines.sym | 1 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.c | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.h | 8 |
3 files changed, 12 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-defines.sym b/sysdeps/x86_64/multiarch/ifunc-defines.sym index eb1538abcc..a410d8808f 100644 --- a/sysdeps/x86_64/multiarch/ifunc-defines.sym +++ b/sysdeps/x86_64/multiarch/ifunc-defines.sym @@ -17,4 +17,5 @@ FEATURE_OFFSET offsetof (struct cpu_features, feature) FEATURE_SIZE sizeof (unsigned int) COMMON_CPUID_INDEX_1 +COMMON_CPUID_INDEX_7 FEATURE_INDEX_1 diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c index db74d977f2..2a6dcb78d8 100644 --- a/sysdeps/x86_64/multiarch/init-arch.c +++ b/sysdeps/x86_64/multiarch/init-arch.c @@ -167,6 +167,9 @@ __init_cpu_features (void) /* Determine if AVX is usable. */ if (CPUID_AVX) __cpu_features.feature[index_AVX_Usable] |= bit_AVX_Usable; + /* Determine if AVX2 is usable. */ + if (CPUID_AVX2) + __cpu_features.feature[index_AVX2_Usable] |= bit_AVX2_Usable; /* Determine if FMA is usable. */ if (CPUID_FMA) __cpu_features.feature[index_FMA_Usable] |= bit_FMA_Usable; diff --git a/sysdeps/x86_64/multiarch/init-arch.h b/sysdeps/x86_64/multiarch/init-arch.h index 793707a4da..813b6de3be 100644 --- a/sysdeps/x86_64/multiarch/init-arch.h +++ b/sysdeps/x86_64/multiarch/init-arch.h @@ -24,6 +24,7 @@ #define bit_FMA_Usable (1 << 7) #define bit_FMA4_Usable (1 << 8) #define bit_Slow_SSE4_2 (1 << 9) +#define bit_AVX2_Usable (1 << 10) /* CPUID Feature flags. */ @@ -40,6 +41,7 @@ /* COMMON_CPUID_INDEX_7. */ #define bit_RTM (1 << 11) +#define bit_AVX2 (1 << 5) /* XCR0 Feature flags. */ #define bit_XMM_state (1 << 1) @@ -54,6 +56,7 @@ # 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_AVX COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET +# define index_AVX2 COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_OFFSET # define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE # define index_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE @@ -64,6 +67,7 @@ # define index_FMA_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_FMA4_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_Slow_SSE4_2 FEATURE_INDEX_1*FEATURE_SIZE +# define index_AVX2_Usable FEATURE_INDEX_1*FEATURE_SIZE #else /* __ASSEMBLER__ */ @@ -145,6 +149,8 @@ extern const struct cpu_features *__get_cpu_features (void) HAS_CPUID_FLAG (COMMON_CPUID_INDEX_80000001, ecx, bit_FMA4) # define CPUID_RTM \ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_7, ebx, bit_RTM) +# define CPUID_AVX2 \ + HAS_CPUID_FLAG (COMMON_CPUID_INDEX_7, ebx, bit_AVX2) /* HAS_* evaluates to true if we may use the feature at runtime. */ # define HAS_SSE2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, bit_SSE2) @@ -153,6 +159,7 @@ extern const struct cpu_features *__get_cpu_features (void) # define HAS_SSE4_1 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_1) # define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_2) # define HAS_RTM HAS_CPU_FEATURE (COMMON_CPUID_INDEX_7, ebx, bit_RTM) +# define HAS_AVX2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_7, ebx, bit_AVX2) # define index_Fast_Rep_String FEATURE_INDEX_1 # define index_Fast_Copy_Backward FEATURE_INDEX_1 @@ -163,6 +170,7 @@ extern const struct cpu_features *__get_cpu_features (void) # define index_FMA_Usable FEATURE_INDEX_1 # define index_FMA4_Usable FEATURE_INDEX_1 # define index_Slow_SSE4_2 FEATURE_INDEX_1 +# define index_AVX2_Usable FEATURE_INDEX_1 # define HAS_ARCH_FEATURE(name) \ ((__get_cpu_features ()->feature[index_##name] & (bit_##name)) != 0) |