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* [Bug math/16386] New: ldbl-128ibm logl inaccurate
@ 2014-01-01 18:16 jsm28 at gcc dot gnu.org
2014-01-02 16:36 ` [Bug math/16386] " cvs-commit at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2014-01-01 18:16 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16386
Bug ID: 16386
Summary: ldbl-128ibm logl inaccurate
Product: glibc
Version: 2.19
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
ldbl-128ibm logl is inaccurate for some (subnormal, at least) inputs, e.g.:
Test "log (0x4p-1076)":
ildouble: 2537856265320914891174599603578
ldouble: 2537856265320914891174599603578
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* [Bug math/16386] ldbl-128ibm logl inaccurate
2014-01-01 18:16 [Bug math/16386] New: ldbl-128ibm logl inaccurate jsm28 at gcc dot gnu.org
@ 2014-01-02 16:36 ` cvs-commit at gcc dot gnu.org
2014-01-02 16:37 ` jsm28 at gcc dot gnu.org
2014-06-13 9:14 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2014-01-02 16:36 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=16386
--- 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 819e5d50dd4d10dc359037eba74c70e74cb42739 (commit)
from 90b6a1e55fdbb3e6a3132742c26eb19666ad9e33 (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=819e5d50dd4d10dc359037eba74c70e74cb42739
commit 819e5d50dd4d10dc359037eba74c70e74cb42739
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Jan 2 16:35:46 2014 +0000
Fix ldbl-128ibm logl inaccuracy (bug 16386).
This patch fixes bug 16386, ldbl-128ibm logl inaccuracy (with
consequent inaccuracy for lgammal) for arguments where the high double
is subnormal, which showed up while attempting to regenerate ulps for
powerpc-nofpu for 2.19. The problem here is logic failing to allow
for subnormals when calculating the exponent of the argument. Tested
for powerpc-nofpu.
* sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): Adjust
numbers with subnormal high part when calculating exponent.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 4 ++++
NEWS | 3 ++-
sysdeps/ieee754/ldbl-128ibm/e_logl.c | 8 ++++++++
3 files changed, 14 insertions(+), 1 deletions(-)
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* [Bug math/16386] ldbl-128ibm logl inaccurate
2014-01-01 18:16 [Bug math/16386] New: ldbl-128ibm logl inaccurate jsm28 at gcc dot gnu.org
2014-01-02 16:36 ` [Bug math/16386] " cvs-commit at gcc dot gnu.org
@ 2014-01-02 16:37 ` jsm28 at gcc dot gnu.org
2014-06-13 9:14 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2014-01-02 16:37 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16386
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.19.
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* [Bug math/16386] ldbl-128ibm logl inaccurate
2014-01-01 18:16 [Bug math/16386] New: ldbl-128ibm logl inaccurate jsm28 at gcc dot gnu.org
2014-01-02 16:36 ` [Bug math/16386] " cvs-commit at gcc dot gnu.org
2014-01-02 16:37 ` jsm28 at gcc dot gnu.org
@ 2014-06-13 9:14 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 9:14 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=16386
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2014-01-01 18:16 [Bug math/16386] New: ldbl-128ibm logl inaccurate jsm28 at gcc dot gnu.org
2014-01-02 16:36 ` [Bug math/16386] " cvs-commit at gcc dot gnu.org
2014-01-02 16:37 ` jsm28 at gcc dot gnu.org
2014-06-13 9:14 ` fweimer at redhat dot com
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