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From: "mwelinder at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/31104] New: Sign inconsistencies with various log functions
Date: Thu, 30 Nov 2023 23:54:51 +0000 [thread overview]
Message-ID: <bug-31104-131@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=31104
Bug ID: 31104
Summary: Sign inconsistencies with various log functions
Product: glibc
Version: 2.35
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: mwelinder at gmail dot com
Target Milestone: ---
printf ("%+.12g %+.12g %+.12g %+.12g\n", log (-42), log2 (-42), log10 (-42),
log1p (-43));
printf ("%+.12g %+.12g %+.12g %+.12g\n", logf (-42), log2f (-42), log10f
(-42), log1pf (-43));
printf ("%+.12Lg %+.12Lg %+.12Lg %+.12Lg\n", logl (-42), log2l (-42), log10l
(-42), log1pl (-43));
gives me...
-nan -nan +nan -nan
-nan -nan +nan -nan
+nan +nan +nan -nan
That's just all over the place!
That sign inconsistency seems silly, even if the standards might allow it.
GNU C Library (Ubuntu GLIBC 2.35-0ubuntu3.4) stable release version 2.35.
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next reply other threads:[~2023-11-30 23:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-30 23:54 mwelinder at gmail dot com [this message]
2023-12-01 7:59 ` [Bug math/31104] " schwab@linux-m68k.org
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