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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-08-25 11:01:03 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-08-25 11:44:24 -0700 |
| commit | ace02433fe2f0ce124d191bb273f738ef56fe387 (patch) | |
| tree | 95f8ae66e11e12d68f2cbaad727a82db21f6b829 /sysdeps/x86/cpu-features.h | |
| parent | 7ab70c98e87b6fbcb3c2c02075b0949ed239ad7e (diff) | |
| download | glibc-hjl/pr21967/master.tar.gz glibc-hjl/pr21967/master.tar.xz glibc-hjl/pr21967/master.zip | |
x86: Add MathVec_Prefer_No_AVX512 to cpu-features [BZ #21967] hjl/pr21967/master
AVX512 functions in mathvec are used on machines with AVX512. An AVX2 wrapper is also provided and it can be used when the AVX512 version isn't profitable. MathVec_Prefer_No_AVX512 is addded to cpu-features. If glibc.tune.hwcaps=MathVec_Prefer_No_AVX512 is set in GLIBC_TUNABLES environment variable, the AVX2 wrapper will be used. [BZ #21967] * sysdeps/x86/cpu-features.h (bit_arch_MathVec_Prefer_No_AVX512): New. (index_arch_MathVec_Prefer_No_AVX512): Likewise. * sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)): Handle MathVec_Prefer_No_AVX512.
Diffstat (limited to 'sysdeps/x86/cpu-features.h')
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index 9e01781424..a032a2e168 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -40,6 +40,7 @@ #define bit_arch_Use_dl_runtime_resolve_opt (1 << 20) #define bit_arch_Use_dl_runtime_resolve_slow (1 << 21) #define bit_arch_Prefer_No_AVX512 (1 << 22) +#define bit_arch_MathVec_Prefer_No_AVX512 (1 << 23) /* CPUID Feature flags. */ @@ -239,6 +240,7 @@ extern const struct cpu_features *__get_cpu_features (void) # define index_arch_Use_dl_runtime_resolve_opt FEATURE_INDEX_1 # define index_arch_Use_dl_runtime_resolve_slow FEATURE_INDEX_1 # define index_arch_Prefer_No_AVX512 FEATURE_INDEX_1 +# define index_arch_MathVec_Prefer_No_AVX512 FEATURE_INDEX_1 #endif /* !__ASSEMBLER__ */ |