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[Bug math/18104] powerpc: Incorrect results for pow when using FMA
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 08 Mar 2016 16:41:42 +0000
- Subject: [Bug math/18104] powerpc: Incorrect results for pow when using FMA
- Auto-submitted: auto-generated
- References: <bug-18104-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=18104
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c95a56e2a8b16eeb911eed5c1bdc8fd26f337f4d
commit c95a56e2a8b16eeb911eed5c1bdc8fd26f337f4d
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Sep 24 16:48:32 2015 +0000
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).
(cherry picked from commit 51df2605064a2bfd44fa0655ef9815812347de80)
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 6 ++++++
NEWS | 4 ++--
sysdeps/x86_64/fpu/multiarch/Makefile | 2 +-
3 files changed, 9 insertions(+), 3 deletions(-)
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