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[Bug math/18039] [ldbl-128] acosl inaccurate
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 26 Feb 2015 21:07:41 +0000
- Subject: [Bug math/18039] [ldbl-128] acosl inaccurate
- Auto-submitted: auto-generated
- References: <bug-18039-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=18039
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1d9ab20c14211abbf45514e63c190dfeec27fa5e
commit 1d9ab20c14211abbf45514e63c190dfeec27fa5e
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Feb 26 21:06:34 2015 +0000
Fix ldbl-128/ldbl-128ibm acosl inaccuracy (bug 18038, bug 18039).
The ldbl-128 and ldbl-128ibm implementations of acosl have similar
bugs, using a threshold of 0x1p-57L to determine when they just return
pi/2. Since the result pi/2 - asinl (x) is roughly pi/2 - x for small
x, the relevant cut-off is actually x being < 0.5ulp of 1. This patch
fixes the implementations to use that cut-off and adds tests of small
acos arguments.
Tested for powerpc and mips64. Also tested for x86_64 and x86; no
ulps updates needed.
[BZ #18038]
[BZ #18039]
* sysdeps/ieee754/ldbl-128/e_acosl.c (__ieee754_acosl): Only
return pi/2 for arguments below 0x1p-113L.
* sysdeps/ieee754/ldbl-128ibm/e_acosl.c (__ieee754_acosl): Only
return pi/2 for arguments below 0x1p-106L.
* math/auto-libm-test-in: Add more tests of acos.
* math/auto-libm-test-out: Regenerated.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 9 +
NEWS | 2 +-
math/auto-libm-test-in | 31 ++
math/auto-libm-test-out | 775 +++++++++++++++++++++++++++++++++
sysdeps/ieee754/ldbl-128/e_acosl.c | 2 +-
sysdeps/ieee754/ldbl-128ibm/e_acosl.c | 2 +-
6 files changed, 818 insertions(+), 3 deletions(-)
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