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GNU C Library master sources branch master updated. glibc-2.26-126-g098b9dd
- From: hjl at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 18 Aug 2017 13:19:34 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.26-126-g098b9dd
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=098b9dd46814f7e624e42a8844c169f3edc67052
commit 098b9dd46814f7e624e42a8844c169f3edc67052
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Fri Aug 18 06:18:55 2017 -0700
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.
diff --git a/ChangeLog b/ChangeLog
index 9ffc40c..8da8e34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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 a43d4c5..ccda274 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);
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 7 +++++++
sysdeps/x86_64/fpu/multiarch/ifunc-mathvec-avx2.h | 3 ++-
2 files changed, 9 insertions(+), 1 deletions(-)
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