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[Bug math/16977] log10 (1) incorrect 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: Fri, 23 May 2014 12:08:52 +0000
- Subject: [Bug math/16977] log10 (1) incorrect in round-downward mode
- Auto-submitted: auto-generated
- References: <bug-16977-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=16977
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b72592e75fdecb34e2ac5f931730409a1fb68e8a
commit b72592e75fdecb34e2ac5f931730409a1fb68e8a
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri May 23 12:07:50 2014 +0000
Fix log10 (1) in round-downward mode (bug 16977).
As with various other issues of this kind, bug 16977 is log10 (1)
wrongly returning -0 rather than +0 in round-downward mode because of
an implementation effectively in terms of log1p (x - 1). This patch
fixes the issue in the same way used for log.
Tested x86_64 and x86 and ulps updated accordingly. Also tested for
mips64 to confirm a fix was needed for ldbl-128 and to validate that
fix (also applied to ldbl-128ibm since that version of logl is
essentially the same as the ldbl-128 one).
[BZ #16977]
* sysdeps/i386/fpu/e_log10.S (__ieee754_log10): Take absolute
value when x - 1 is zero.
* sysdeps/i386/fpu/e_log10f.S (__ieee754_log10f): Likewise.
* sysdeps/i386/fpu/e_log10l.S (__ieee754_log10l): Likewise.
* sysdeps/ieee754/ldbl-128/e_log10l.c (__ieee754_log10l): Return
0.0L for an argument of 1.0L.
* sysdeps/ieee754/ldbl-128ibm/e_log10l.c (__ieee754_log10l):
Likewise.
* sysdeps/x86_64/fpu/e_log10l.S (__ieee754_log10l): Take absolute
value when x - 1 is zero.
* math/libm-test.inc (log10_test): Use ALL_RM_TEST.
* sysdeps/i386/fpu/libm-test-ulps: Update.
* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 17 +++++++++++++++++
NEWS | 2 +-
math/libm-test.inc | 4 +---
sysdeps/i386/fpu/e_log10.S | 8 +++++++-
sysdeps/i386/fpu/e_log10f.S | 8 +++++++-
sysdeps/i386/fpu/e_log10l.S | 8 +++++++-
sysdeps/i386/fpu/libm-test-ulps | 24 ++++++++++++++++++++++++
sysdeps/ieee754/ldbl-128/e_log10l.c | 3 +++
sysdeps/ieee754/ldbl-128ibm/e_log10l.c | 3 +++
sysdeps/x86_64/fpu/e_log10l.S | 8 +++++++-
sysdeps/x86_64/fpu/libm-test-ulps | 24 ++++++++++++++++++++++++
11 files changed, 101 insertions(+), 8 deletions(-)
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