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[Bug math/17987] remquo bad sign of zero remainder in round-downward mode
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 17 Feb 2015 00:42:57 +0000
- Subject: [Bug math/17987] remquo bad sign of zero remainder in round-downward mode
- Auto-submitted: auto-generated
- References: <bug-17987-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=17987
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ce8fc784e619ada624dc41ed7603211131e66573
commit ce8fc784e619ada624dc41ed7603211131e66573
Author: Joseph Myers <joseph@codesourcery.com>
Date: Tue Feb 17 00:41:50 2015 +0000
Fix sign of remquo zero remainder in round-downward mode (bug 17987).
Various remquo implementations produce a zero remainder with the wrong
sign (a zero remainder should always have the sign of the first
argument, as specified in IEEE 754) in round-downward mode, resulting
from the sign of 0 - 0. This patch checks for zero results and fixes
their sign accordingly.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #17987]
* sysdeps/ieee754/dbl-64/s_remquo.c (__remquo): Ensure sign of
zero result does not depend on the sign resulting from
subtraction.
* sysdeps/ieee754/dbl-64/wordsize-64/s_remquo.c (__remquo):
Likewise.
* sysdeps/ieee754/flt-32/s_remquof.c (__remquof): Likewise.
* sysdeps/ieee754/ldbl-128/s_remquol.c (__remquol): Likewise.
* sysdeps/ieee754/ldbl-128ibm/s_remquol.c (__remquol): Likewise.
* sysdeps/ieee754/ldbl-96/s_remquol.c (__remquol): Likewise.
* math/libm-test.inc (remquo_test_data): Add more tests.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 14 ++++++++++++++
NEWS | 2 +-
math/libm-test.inc | 10 ++++++++++
sysdeps/ieee754/dbl-64/s_remquo.c | 3 +++
sysdeps/ieee754/dbl-64/wordsize-64/s_remquo.c | 3 +++
sysdeps/ieee754/flt-32/s_remquof.c | 3 +++
sysdeps/ieee754/ldbl-128/s_remquol.c | 3 +++
sysdeps/ieee754/ldbl-128ibm/s_remquol.c | 3 +++
sysdeps/ieee754/ldbl-96/s_remquol.c | 3 +++
9 files changed, 43 insertions(+), 1 deletions(-)
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