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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-tunables.c | |
| parent | 7ab70c98e87b6fbcb3c2c02075b0949ed239ad7e (diff) | |
| download | glibc-hjl/pr21967/master.tar glibc-hjl/pr21967/master.tar.gz glibc-hjl/pr21967/master.tar.bz2 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-tunables.c')
| -rw-r--r-- | sysdeps/x86/cpu-tunables.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c index 0ab708cca8..ec72d86f08 100644 --- a/sysdeps/x86/cpu-tunables.c +++ b/sysdeps/x86/cpu-tunables.c @@ -303,6 +303,13 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) disable, 23); } break; + case 24: + { + CHECK_GLIBC_IFUNC_ARCH_NEED_ARCH_BOTH + (n, cpu_features, MathVec_Prefer_No_AVX512, + AVX512F_Usable, disable, 24); + } + break; case 26: { CHECK_GLIBC_IFUNC_ARCH_NEED_CPU_BOTH |