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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-09-12 07:46:11 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-09-12 07:54:47 -0700 |
| commit | ef8adeb0416309082c41a1518caee6961b5c42e8 (patch) | |
| tree | 1907bd459f82a962252cc5852bbee9025b3a99ad /nss/nss_files | |
| parent | a166531fdf601560a0005479427f60d3173f8257 (diff) | |
| download | glibc-ef8adeb0416309082c41a1518caee6961b5c42e8.tar.gz glibc-ef8adeb0416309082c41a1518caee6961b5c42e8.tar.xz glibc-ef8adeb0416309082c41a1518caee6961b5c42e8.zip | |
x86: Add MathVec_Prefer_No_AVX512 to cpu-features [BZ #21967]
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. Tested on x86-64 machines with and without AVX512. Also verified glibc.tune.hwcaps=MathVec_Prefer_No_AVX512 on AVX512 machine. [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. * sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx512.h (IFUNC_SELECTOR): Return AVX2 version if MathVec_Prefer_No_AVX512 is set.
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