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[Bug math/15394] New: Inaccurate imaginary part of catan result, real part of catanh result
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 24 Apr 2013 15:37:08 +0000
- Subject: [Bug math/15394] New: Inaccurate imaginary part of catan result, real part of catanh result
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=15394
Bug #: 15394
Summary: Inaccurate imaginary part of catan result, real part
of catanh result
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 can produce results with inaccurate imaginary part from the use of log of
numbers very close to 1; likewise, catanh can produce results with inaccurate
real part. For example, on x86_64, catan (0x1p500i) produces imaginary part 0,
and catanh (0x1p500) produces real part 0, when the expected value is
3.0549...e-151 in each case.
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