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[Bug math/21171] log10, log2 and lgamma return incorrect results
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 17 Feb 2017 11:10:57 +0000
- Subject: [Bug math/21171] log10, log2 and lgamma return incorrect results
- Auto-submitted: auto-generated
- References: <bug-21171-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21171
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=51b34a9c47e4228873788ad66699c328e27a3295
commit 51b34a9c47e4228873788ad66699c328e27a3295
Author: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Date: Fri Feb 17 09:07:57 2017 -0200
Fix lgamma*, log10* and log2* results [BZ #21171]
lgamma(-x) should return +Inf and raise divide-by-zero.
log10(+-0) and log2(+-0) should return -Inf and raise divide-by-zero.
Tested on powerpc, powerpc64, powerpc64le and x86_64.
[BZ #21171]
* sysdeps/ieee754/dbl-64/e_lgamma_r.c (__ieee754_lgamma_r): Return
+Inf and raise divide-by-zero when x is negative.
* sysdeps/ieee754/flt-32/e_lgammaf_r.c (__ieee754_lgammaf_r): Likewise.
* sysdeps/ieee754/ldbl-128/e_lgammal_r.c (__ieee754_lgammal_r):
Likewise.
* sysdeps/ieee754/dbl-64/e_log10.c (__ieee754_log10): Return
-Inf and raise divide-by-zero when x = +-0.
* sysdeps/ieee754/dbl-64/e_log2.c (__ieee754_log2): Likewise.
* sysdeps/ieee754/flt-32/e_log10f.c (__ieee754_log10f): Likewise.
* sysdeps/ieee754/flt-32/e_log2f.c (__ieee754_log2f): Likewise.
* sysdeps/ieee754/ldbl-128/e_log10l.c (__ieee754_log10l): Likewise.
* sysdeps/ieee754/ldbl-128/e_log2l.c (__ieee754_log2l): Likewise.
* sysdeps/ieee754/ldbl-128ibm/e_log10l.c (__ieee754_log10l): Likewise.
* sysdeps/ieee754/ldbl-128ibm/e_log2l.c (__ieee754_log2l): Likewise.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 17 +++++++++++++++++
sysdeps/ieee754/dbl-64/e_lgamma_r.c | 2 +-
sysdeps/ieee754/dbl-64/e_log10.c | 2 +-
sysdeps/ieee754/dbl-64/e_log2.c | 2 +-
sysdeps/ieee754/flt-32/e_lgammaf_r.c | 2 +-
sysdeps/ieee754/flt-32/e_log10f.c | 2 +-
sysdeps/ieee754/flt-32/e_log2f.c | 2 +-
sysdeps/ieee754/ldbl-128/e_lgammal_r.c | 2 +-
sysdeps/ieee754/ldbl-128/e_log10l.c | 2 +-
sysdeps/ieee754/ldbl-128/e_log2l.c | 2 +-
sysdeps/ieee754/ldbl-128ibm/e_log10l.c | 2 +-
sysdeps/ieee754/ldbl-128ibm/e_log2l.c | 2 +-
12 files changed, 28 insertions(+), 11 deletions(-)
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