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From: "stevenb at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/18046] Missed jump threading optimization
Date: Mon, 18 Oct 2004 22:50:00 -0000 [thread overview]
Message-ID: <20041018225042.18146.qmail@sourceware.org> (raw)
In-Reply-To: <20041018121604.18046.steven@gcc.gnu.org>
------- Additional Comments From stevenb at suse dot de 2004-10-18 22:50 -------
Subject: Re: Missed jump threading optimization
Hmm, threading the default case sounds interesting, but the real
reason why the RTL threader catches this and the tree threader does
not is because on RTL the test case basically looks like this:
extern void foo (void);
extern int i;
void
bar (void)
{
if (i == 0)
foo ();
if (i == 0)
foo ();
}
Hey, I can thread that! :-)
So perhaps we should consider lowering SWITCH_EXPRs with only two
targets to COND_EXPRs after all...? That would be quite easy to
do.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18046
next prev parent reply other threads:[~2004-10-18 22:50 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-18 12:16 [Bug tree-optimization/18046] New: " steven at gcc dot gnu dot org
2004-10-18 12:52 ` [Bug tree-optimization/18046] " pinskia at gcc dot gnu dot org
2004-10-18 13:22 ` steven at gcc dot gnu dot org
2004-10-18 17:30 ` steven at gcc dot gnu dot org
2004-10-18 18:31 ` law at redhat dot com
2004-10-18 22:50 ` stevenb at suse dot de [this message]
2004-10-19 20:16 ` law at redhat dot com
2005-04-23 16:58 ` steven at gcc dot gnu dot org
[not found] <bug-18046-280@http.gcc.gnu.org/bugzilla/>
2005-10-07 21:21 ` steven at gcc dot gnu dot org
2006-03-21 15:57 ` law at redhat dot com
2006-03-21 16:05 ` pinskia at gcc dot gnu dot org
2006-03-21 16:57 ` dberlin at dberlin dot org
2008-09-21 14:00 ` steven at gcc dot gnu dot org
2008-09-23 21:56 ` law at redhat dot com
2010-02-04 22:52 ` steven at gcc dot gnu dot org
2010-07-13 10:30 ` steven at gcc dot gnu dot org
[not found] <bug-18046-4@http.gcc.gnu.org/bugzilla/>
2011-07-20 0:34 ` pinskia at gcc dot gnu.org
2012-11-08 22:30 ` steven at gcc dot gnu.org
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