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[Bug math/14331] New: csqrt inaccuracy on internal underflows with subnormal argument
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Wed, 04 Jul 2012 16:55:04 +0000
- Subject: [Bug math/14331] New: csqrt inaccuracy on internal underflows with subnormal argument
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=14331
Bug #: 14331
Summary: csqrt inaccuracy on internal underflows with subnormal
argument
Product: glibc
Version: 2.16
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
Some internal underflows can cause substantial inaccuracy in the results of
csqrt. Specifically, on x86_64, csqrt (0x1p-1074i) returns zero and csqrt
(0x1p-500 + 0x1p-1074i) returns an imaginary part of zero (should be
4.469444793151709302716387622440056066334e-249).
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