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x86-64: Check FMA_Usable in ifunc-mathvec-avx2.h [BZ #21966]

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Since the AVX2 version of mathvec functions uses FMA, it can only be
used when FMA is usable.

	[BZ #21966]
	* sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h
	(IFUNC_SELECTOR): Don't use the AVX2 version if FMA isn't
	usable.
This commit is contained in:
H.J. Lu 2017-08-18 06:18:55 -07:00
parent 486afa6d27
commit 098b9dd468
2 changed files with 9 additions and 1 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2017-08-18 H.J. Lu <hongjiu.lu@intel.com>
[BZ #21966]
* sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h
(IFUNC_SELECTOR): Don't use the AVX2 version if FMA isn't
usable.
2017-08-17 DJ Delorie <dj@redhat.com>
* bug17079.c: Update to new test harness.

3
sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h
View File

@ -31,7 +31,8 @@ IFUNC_SELECTOR (void)
{
const struct cpu_features* cpu_features = __get_cpu_features ();
if (CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable))
if (CPU_FEATURES_ARCH_P (cpu_features, FMA_Usable)
&& CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable))
return OPTIMIZE (avx2);
return OPTIMIZE (sse_wrapper);