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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-08-18 06:18:55 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-08-18 06:19:07 -0700 |
| commit | 098b9dd46814f7e624e42a8844c169f3edc67052 (patch) | |
| tree | 04f0e8e4adc639c0788d8f9ae12e22e1ff9800f7 | |
| parent | 486afa6d27156665959e59b86e7aad18c3832cbe (diff) | |
| download | glibc-098b9dd46814f7e624e42a8844c169f3edc67052.tar.gz | |
x86-64: Check FMA_Usable in ifunc-mathvec-avx2.h [BZ #21966]
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.
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h | 3 |
2 files changed, 9 insertions, 1 deletions
@@ -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. diff --git a/sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h b/sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h index a43d4c54fa..ccda2748c5 100644 --- a/sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h +++ b/sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h @@ -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); |