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[Bug math/18030] New: [ldbl-128ibm] logbl wrong near powers of 2
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 25 Feb 2015 22:14:48 +0000
- Subject: [Bug math/18030] New: [ldbl-128ibm] logbl wrong near powers of 2
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=18030
Bug ID: 18030
Summary: [ldbl-128ibm] logbl wrong near powers of 2
Product: glibc
Version: 2.21
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
Similar to bug 18029 for ilogbl, the ldbl-128ibm implementation of logbl
produces incorrect results when the high part of the argument is a power of 2
and the low part a nonzero number with the opposite sign (and so the returned
exponent should be 1 less than that of the high part). For example, logbl
(0x1.ffffffffffffffp1L) returns 2 but should return 1.
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