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[Bug math/15023] New: cacos inaccurate for real part of result near
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 16 Jan 2013 23:04:23 +0000
- Subject: [Bug math/15023] New: cacos inaccurate for real part of result near
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=15023
Bug #: 15023
Summary: cacos inaccurate for real part of result near 0
Product: glibc
Version: 2.16
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: jsm28@gcc.gnu.org
Classification: Unclassified
cacos is implemented as pi/2 - casin. This leads to inaccurate results through
cancellation when the real part of the result of casin is near pi/2, so the
real part of the result of cacos is near 0. For example, cacos (0x1p500 +
1.0i) gives a result with real part 0 (should be
3.054936363499604682051979393213617699789e-151).
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