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From: "rsa at us dot ibm.com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug math/887] Math library function "logb" and "nextafter" inconsistent
Date: Thu, 01 Mar 2012 21:26:00 -0000 [thread overview]
Message-ID: <bug-887-131-2ZjVLsDy2f@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-887-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=887
--- Comment #18 from Ryan S. Arnold <rsa at us dot ibm.com> 2012-03-01 21:26:05 UTC ---
A bit more investigation reveals the issue:
Building logb with -mcpu=power4 or -mcpu=ppc970 results in a negative signed
zero. This is due to the power4 and ppc970 versions using fsub.
The fcfid insn was introduced after power4 and logb uses that when built for
power5 and power6. A negative signed zero is not encountered in these cases.
So technically YES, this is still an issue, but it originates in GCC due to
insn selection.
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next prev parent reply other threads:[~2012-03-01 21:26 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-887-131@http.sourceware.org/bugzilla/>
2012-02-22 21:44 ` jsm28 at gcc dot gnu.org
2012-02-23 19:49 ` rsa at us dot ibm.com
2012-02-23 21:29 ` rsa at us dot ibm.com
2012-02-23 21:39 ` joseph at codesourcery dot com
2012-02-23 21:44 ` rsa at us dot ibm.com
2012-02-23 23:18 ` rsa at us dot ibm.com
2012-02-29 16:22 ` rsa at us dot ibm.com
2012-02-29 16:23 ` rsa at us dot ibm.com
2012-03-01 21:26 ` rsa at us dot ibm.com [this message]
2012-03-26 19:34 ` rsa at us dot ibm.com
2012-03-26 20:43 ` rsa at us dot ibm.com
2012-03-26 20:51 ` joseph at codesourcery dot com
2012-03-26 20:56 ` rsa at us dot ibm.com
2012-03-26 20:57 ` rsa at us dot ibm.com
2012-03-26 22:23 ` rsa at us dot ibm.com
2012-04-25 22:01 ` rsa at us dot ibm.com
2012-04-26 18:16 ` rsa at us dot ibm.com
2012-04-26 18:53 ` joseph at codesourcery dot com
2012-04-26 19:04 ` rsa at us dot ibm.com
2012-04-27 16:31 ` rsa at us dot ibm.com
2014-01-07 22:43 ` cvs-commit at gcc dot gnu.org
2015-10-01 21:50 ` jsm28 at gcc dot gnu.org
2015-10-01 21:51 ` jsm28 at gcc dot gnu.org
2015-10-05 17:48 ` cvs-commit at gcc dot gnu.org
2015-10-05 17:50 ` cvs-commit at gcc dot gnu.org
2015-10-05 17:51 ` jsm28 at gcc dot gnu.org
2005-04-28 17:50 [Bug math/887] New: " uttamp at us dot ibm dot com
2005-04-29 20:38 ` [Bug math/887] " uttamp at us dot ibm dot com
2005-06-16 19:12 ` uttamp at us dot ibm dot com
2005-07-19 22:16 ` uttamp at us dot ibm dot com
2005-10-25 17:05 ` uttamp at us dot ibm dot com
2005-11-02 1:29 ` uttamp at us dot ibm dot com
2005-11-21 17:57 ` uttamp at us dot ibm dot com
2005-11-21 18:07 ` jakub at redhat dot com
2006-09-30 5:03 ` rsa at us dot ibm dot com
2006-09-30 5:54 ` rsa at us dot ibm dot com
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