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| author | Joseph Myers <joseph@codesourcery.com> | 2015-09-24 16:48:32 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-09-24 16:48:32 +0000 |
| commit | 51df2605064a2bfd44fa0655ef9815812347de80 (patch) | |
| tree | a0abf7172d01f3766a34ccea0dbb5ea85703c42a /ChangeLog | |
| parent | 24ffcbfc24e08212cc5b1fa8318940e75b06313c (diff) | |
| download | glibc-51df2605064a2bfd44fa0655ef9815812347de80.tar.gz glibc-51df2605064a2bfd44fa0655ef9815812347de80.tar.xz glibc-51df2605064a2bfd44fa0655ef9815812347de80.zip | |
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 'ChangeLog')
| -rw-r--r-- | ChangeLog | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index c900f20e89..df079ca412 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2015-09-24 Joseph Myers <joseph@codesourcery.com> + + [BZ #19003] + * sysdeps/x86_64/fpu/multiarch/Makefile (CFLAGS-e_pow-fma4.c): Add + $(config-cflags-nofma). + 2015-09-24 Szabolcs Nagy <szabolcs.nagy@arm.com> * sysdeps/aarch64/libm-test-ulps: Regenerated. |