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[Bug math/16520] Missing underflow exception from tanhf
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 13 Aug 2015 16:41:48 +0000
- Subject: [Bug math/16520] Missing underflow exception from tanhf
- Auto-submitted: auto-generated
- References: <bug-16520-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=16520
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=37d83a089ddf7649ea0a97d4121883381e23f999
commit 37d83a089ddf7649ea0a97d4121883381e23f999
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Aug 13 16:40:39 2015 +0000
Fix tanh missing underflows (bug 16520).
Similar to various other bugs in this area, some tanh implementations
do not raise the underflow exception for subnormal arguments, when the
result is tiny and inexact. This patch forces the exception in a
similar way to previous fixes.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #16520]
* sysdeps/ieee754/dbl-64/s_tanh.c: Include <float.h>.
(__tanh): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/flt-32/s_tanhf.c: Include <float.h>.
(__tanhf): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/ldbl-128/s_tanhl.c: Include <float.h>.
(__tanhl): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/ldbl-128ibm/s_tanhl.c: Include <float.h>.
(__tanhl): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/ldbl-96/s_tanhl.c: Include <float.h>.
(__tanhl): Force underflow exception for arguments with small
absolute value.
* math/auto-libm-test-in: Add more tests of tanh.
* math/auto-libm-test-out: Regenerated.
* sysdeps/i386/fpu/libm-test-ulps: Update.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 22 +++
NEWS | 4 +-
math/auto-libm-test-in | 4 +
math/auto-libm-test-out | 316 +++++++++++++++++++++++++++++++++
sysdeps/i386/fpu/libm-test-ulps | 4 +
sysdeps/ieee754/dbl-64/s_tanh.c | 10 +-
sysdeps/ieee754/flt-32/s_tanhf.c | 8 +
sysdeps/ieee754/ldbl-128/s_tanhl.c | 10 +-
sysdeps/ieee754/ldbl-128ibm/s_tanhl.c | 8 +
sysdeps/ieee754/ldbl-96/s_tanhl.c | 8 +
10 files changed, 390 insertions(+), 4 deletions(-)
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