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From: "kreckel at ginac dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/29186] New: optimzation breaks floating point exception flag reading
Date: Fri, 22 Sep 2006 19:13:00 -0000 [thread overview]
Message-ID: <bug-29186-1882@http.gcc.gnu.org/bugzilla/> (raw)
See <http://gcc.gnu.org/ml/gcc-help/2006-09/msg00232.html>.
Disassembling the code suggests that, using gcc-4.1,2, both calls to
fetestexcept(3) mysteriously happened before the division when optimization is
turned on. This was not the case with earlier versions of gcc, where the calls
to fetestexcept(3) bracket the fdivl instruction.
--
Summary: optimzation breaks floating point exception flag reading
Product: gcc
Version: 4.1.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kreckel at ginac dot de
GCC build triplet: i486-linux-gnu
GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29186
next reply other threads:[~2006-09-22 19:13 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-22 19:13 kreckel at ginac dot de [this message]
2006-09-22 19:24 ` [Bug c/29186] " pinskia at gcc dot gnu dot org
2006-09-22 19:25 ` pinskia at gcc dot gnu dot org
2006-09-22 19:28 ` pinskia at gcc dot gnu dot org
2006-09-22 22:34 ` kreckel at ginac dot de
2006-09-23 21:41 ` kreckel at ginac dot de
2006-09-23 21:52 ` joseph at codesourcery dot com
2006-09-23 22:11 ` kreckel at ginac dot de
2006-09-23 22:19 ` joseph at codesourcery dot com
2006-09-23 22:58 ` kreckel at ginac dot de
2006-09-23 23:02 ` joseph at codesourcery dot com
2006-09-24 0:35 ` pinskia at gmail dot com
2006-09-24 16:51 ` kreckel at ginac dot de
2006-09-25 7:40 ` kreckel at ginac dot de
2006-10-25 7:54 ` kreckel at ginac dot de
2006-10-25 7:57 ` pinskia at gcc dot gnu dot org
2006-10-25 13:22 ` kreckel at ginac dot de
2006-10-31 11:49 ` kreckel at ginac dot de
2006-11-06 22:23 ` kreckel at ginac dot de
2006-11-19 11:22 ` kreckel at ginac dot de
2006-11-19 12:14 ` rguenth at gcc dot gnu dot org
2009-05-04 6:47 ` kreckel at ginac dot de
2009-12-29 21:48 ` fxcoudert at gcc dot gnu dot org
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