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[Bug math/16338] New: ldbl-128 logl does not handle subnormals
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 18 Dec 2013 00:02:59 +0000
- Subject: [Bug math/16338] New: ldbl-128 logl does not handle subnormals
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=16338
Bug ID: 16338
Summary: ldbl-128 logl does not handle subnormals
Product: glibc
Version: 2.19
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
The ldbl-128 logl implementation treats subnormals as if their exponent is
normal, resulting in large errors (e.g. logl (0x1p-16494L) is
-0x1.62dea45ee3e064dbc66918126b26p+13 when it should be
-0x1.6546282207802c89d24d65e96274p+13). I think this is in turn the cause of
large lgammal errors in libm testing.
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