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authorJoseph Myers <joseph@codesourcery.com>2015-09-24 16:48:32 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-09-24 16:48:32 +0000
commit51df2605064a2bfd44fa0655ef9815812347de80 (patch)
treea0abf7172d01f3766a34ccea0dbb5ea85703c42a /sysdeps/x86_64/fpu/multiarch/Makefile
parent24ffcbfc24e08212cc5b1fa8318940e75b06313c (diff)
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Fix x86_64 fma4 pow inappropriate contraction (bug 19003).
The x86_64 fma4 version of pow fails to disable contraction of
operations other than those explicitly intended to use fma
instructions, so resulting in large ulps errors on processors with
fma4 instructions, as in bug 18104 (165ulp for the test added for that
bug; error originally reported by "blaaa" on #glibc).  This patch adds
$(config-cflags-nofma) for e_pow-fma4.c, corresponding to the use for
e_pow.c in sysdeps/ieee754/dbl-64/Makefile.

Tested for x86_64 on a processor with fma4.

	[BZ #19003]
	* sysdeps/x86_64/fpu/multiarch/Makefile (CFLAGS-e_pow-fma4.c): Add
	$(config-cflags-nofma).
Diffstat (limited to 'sysdeps/x86_64/fpu/multiarch/Makefile')
-rw-r--r--sysdeps/x86_64/fpu/multiarch/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile b/sysdeps/x86_64/fpu/multiarch/Makefile
index 86ea473b4f..631534a5ce 100644
--- a/sysdeps/x86_64/fpu/multiarch/Makefile
+++ b/sysdeps/x86_64/fpu/multiarch/Makefile
@@ -16,7 +16,7 @@ CFLAGS-e_asin-fma4.c = -mfma4
 CFLAGS-e_atan2-fma4.c = -mfma4
 CFLAGS-e_exp-fma4.c = -mfma4
 CFLAGS-e_log-fma4.c = -mfma4
-CFLAGS-e_pow-fma4.c = -mfma4
+CFLAGS-e_pow-fma4.c = -mfma4 $(config-cflags-nofma)
 CFLAGS-halfulp-fma4.c = -mfma4
 CFLAGS-mpa-fma4.c = -mfma4
 CFLAGS-mpatan-fma4.c = -mfma4