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[Bug math/18029] [ldbl-128ibm] ilogbl wrong near powers of 2
- 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 12:58:29 +0000
- Subject: [Bug math/18029] [ldbl-128ibm] ilogbl wrong near powers of 2
- Auto-submitted: auto-generated
- References: <bug-18029-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=18029
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1
commit 524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Feb 26 12:57:21 2015 +0000
Fix ldbl-128ibm ilogbl near powers of 2 (bug 18029).
The ldbl-128ibm implementation of ilogbl produces incorrect results
when the high part of the argument is a power of 2 and the low part a
nonzero number with the opposite sign (and so the returned exponent
should be 1 less than that of the high part). For example, ilogbl
(0x1.ffffffffffffffp1L) returns 2 but should return 1. (This is
similar to (fixed) bug 16740 for frexpl, and bug 18030 for logbl.)
This patch adds checks for that case.
Tested for powerpc.
[BZ #18029]
* sysdeps/ieee754/ldbl-128ibm/e_ilogbl.c (__ieee754_ilogbl):
Adjust exponent of power of 2 down when low part has opposite
sign.
* math/libm-test.inc (ilogb_test_data): Add more tests.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 8 ++++++++
NEWS | 2 +-
math/libm-test.inc | 5 +++++
sysdeps/ieee754/ldbl-128ibm/e_ilogbl.c | 23 +++++++++++++++++++----
4 files changed, 33 insertions(+), 5 deletions(-)
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