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* [Bug math/19003] New: [x86_64] fma4 version of pow inappropriate contraction
@ 2015-09-24 16:44 jsm28 at gcc dot gnu.org
2015-09-24 16:50 ` [Bug math/19003] " cvs-commit at gcc dot gnu.org
2015-09-24 16:51 ` jsm28 at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2015-09-24 16:44 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=19003
Bug ID: 19003
Summary: [x86_64] fma4 version of pow inappropriate contraction
Product: glibc
Version: 2.22
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-*-*
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).
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* [Bug math/19003] [x86_64] fma4 version of pow inappropriate contraction
2015-09-24 16:44 [Bug math/19003] New: [x86_64] fma4 version of pow inappropriate contraction jsm28 at gcc dot gnu.org
@ 2015-09-24 16:50 ` cvs-commit at gcc dot gnu.org
2015-09-24 16:51 ` jsm28 at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2015-09-24 16:50 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=19003
--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, master has been updated
via 51df2605064a2bfd44fa0655ef9815812347de80 (commit)
from 24ffcbfc24e08212cc5b1fa8318940e75b06313c (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=51df2605064a2bfd44fa0655ef9815812347de80
commit 51df2605064a2bfd44fa0655ef9815812347de80
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).
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 6 ++++++
NEWS | 2 +-
sysdeps/x86_64/fpu/multiarch/Makefile | 2 +-
3 files changed, 8 insertions(+), 2 deletions(-)
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* [Bug math/19003] [x86_64] fma4 version of pow inappropriate contraction
2015-09-24 16:44 [Bug math/19003] New: [x86_64] fma4 version of pow inappropriate contraction jsm28 at gcc dot gnu.org
2015-09-24 16:50 ` [Bug math/19003] " cvs-commit at gcc dot gnu.org
@ 2015-09-24 16:51 ` jsm28 at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2015-09-24 16:51 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=19003
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |2.23
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.23.
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2015-09-24 16:51 ` jsm28 at gcc dot gnu.org
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