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authorH.J. Lu <hjl.tools@gmail.com>2017-08-25 11:01:03 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-08-25 11:44:24 -0700
commitace02433fe2f0ce124d191bb273f738ef56fe387 (patch)
tree95f8ae66e11e12d68f2cbaad727a82db21f6b829 /stdio-common/tempnam.c
parent7ab70c98e87b6fbcb3c2c02075b0949ed239ad7e (diff)
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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.
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