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[Bug math/14784] New: Spurious underflows from fma when a * b is small
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Tue, 30 Oct 2012 01:03:30 +0000
- Subject: [Bug math/14784] New: Spurious underflows from fma when a * b is small
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=14784
Bug #: 14784
Summary: Spurious underflows from fma when a * b is small
Product: glibc
Version: 2.16
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
fma (a, b, c) gives spurious underflow exceptions in some cases when a * b is
sufficiently small that the implementation uses a * b + c for the computation,
but the final result does not underflow. Example, on x86: fmal (0x1p-16382L,
-0x1p-16382L, 0x1p16383L).
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