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[Bug math/16564] Bad overflowing log1p results
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 14 May 2014 12:39:53 +0000
- Subject: [Bug math/16564] Bad overflowing log1p results
- Auto-submitted: auto-generated
- References: <bug-16564-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=16564
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1a84c3d6d4bc43c92b6531b09d732e2e9c750dea
commit 1a84c3d6d4bc43c92b6531b09d732e2e9c750dea
Author: Joseph Myers <joseph@codesourcery.com>
Date: Wed May 14 12:38:56 2014 +0000
Fix log1pl (LDBL_MAX) in FE_UPWARD mode (bug 16564).
Bug 16564 is spurious overflow of log1pl (LDBL_MAX) in FE_UPWARD mode,
resulting from log1pl adding 1 to its argument (for arguments not
close to 0), which overflows in that mode. This patch fixes this by
avoiding adding 1 to large arguments (precisely what counts as large
depends on the floating-point format).
Tested x86_64 and x86, and spot-checked log1pl tests on mips64 and
powerpc64.
[BZ #16564]
* sysdeps/i386/fpu/s_log1pl.S (__log1pl): Do not add 1 to positive
arguments with exponent 65 or above.
* sysdeps/ieee754/ldbl-128/s_log1pl.c (__log1pl): Do not add 1 to
arguments 0x1p113L or above.
* sysdeps/ieee754/ldbl-128ibm/s_log1pl.c (__log1pl): Do not add 1
to arguments 0x1p107L or above.
* sysdeps/x86_64/fpu/s_log1pl.S (__log1pl): Do not add 1 to
positive arguments with exponent 65 or above.
* math/auto-libm-test-in: Add more tests of log1p.
* math/auto-libm-test-out: Regenerated.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 12 ++
NEWS | 14 +-
math/auto-libm-test-in | 8 +
math/auto-libm-test-out | 264 ++++++++++++++++++++++++++++++++
sysdeps/i386/fpu/s_log1pl.S | 7 +-
sysdeps/ieee754/ldbl-128/s_log1pl.c | 5 +-
sysdeps/ieee754/ldbl-128ibm/s_log1pl.c | 5 +-
sysdeps/x86_64/fpu/s_log1pl.S | 7 +-
8 files changed, 311 insertions(+), 11 deletions(-)
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