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[Bug math/16928] cacos wrong sign of zero in FE_DOWNWARD mode
- 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 12:38:19 +0000
- Subject: [Bug math/16928] cacos wrong sign of zero in FE_DOWNWARD mode
- Auto-submitted: auto-generated
- References: <bug-16928-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=16928
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=01dbacd22a8d5e0053f8d0cf13a80286b6cfe79b
commit 01dbacd22a8d5e0053f8d0cf13a80286b6cfe79b
Author: Joseph Myers <joseph@codesourcery.com>
Date: Wed May 14 12:37:24 2014 +0000
Fix cacos (+Inf + finite*i) in round-downward mode (bug 16928).
According to C99/C11 Annex G, cacos applied to a value with real part
+Inf and finite imaginary part should produce a result with real part
+0. glibc wrongly produces a result with real part -0 in FE_DOWNWARD
mode. This patch fixes this by checking for zero results in the
relevant case of non-finite arguments (where there should never be a
result with -0 real part), and converts the tests of cacos to
ALL_RM_TEST.
Tested x86_64 and x86 and ulps updated accordingly.
[BZ #16928]
* math/s_cacos.c (__cacos): Ensure zero real part of result from
non-finite arguments is +0.
* math/s_cacosf.c (__cacosf): Likewise.
* math/s_cacosl.c (__cacosl): Likewise.
* math/libm-test.inc (cacos_test): Use ALL_RM_TEST.
* sysdeps/i386/fpu/libm-test-ulps: Update.
* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 9 +++++++
NEWS | 2 +-
math/libm-test.inc | 4 +--
math/s_cacos.c | 2 +
math/s_cacosf.c | 2 +
math/s_cacosl.c | 2 +
sysdeps/i386/fpu/libm-test-ulps | 48 +++++++++++++++++++++++++++++++++++++
sysdeps/x86_64/fpu/libm-test-ulps | 48 +++++++++++++++++++++++++++++++++++++
8 files changed, 113 insertions(+), 4 deletions(-)
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