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[Bug math/15426] New: Wrong sign of infinity from tgamma overflow
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 01 May 2013 22:17:58 +0000
- Subject: [Bug math/15426] New: Wrong sign of infinity from tgamma overflow
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=15426
Bug #: 15426
Summary: Wrong sign of infinity from tgamma overflow
Product: glibc
Version: 2.17
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
When tgamma of a negative argument very close to 0 overflows (the result is
essentially 1/x), it should produce negative infinity but wrongly produces
positive infinity. Example on x86_64: tgamma (-0x1p-1074).
(Discovered while working on a fix for the various known bugs about large ulps
from tgamma.)
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