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[Bug math/15406] New: catan, catanh missing underflow exceptions
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 26 Apr 2013 16:19:25 +0000
- Subject: [Bug math/15406] New: catan, catanh missing underflow exceptions
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=15406
Bug #: 15406
Summary: catan, catanh missing underflow exceptions
Product: glibc
Version: 2.17
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
catan and catanh can miss underflow exceptions in the case where the tiny
result comes from the multiplication of a log by 0.25, and that multiplication
is exact although the mathematical result of the log wasn't exact. Examples on
x86_64 are catan (0x1p511 + 0.5i) and catanh (0.5 + 0x1p511i).
(Before my recent fix for bug 15394, the tiny results would have been given
inaccurately as 0, but still with missing underflow exception.)
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