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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/15757] Convert "If (a >= b) X else if (b <= a) Y" into "if (a >= b) X".
Date: Sat, 05 Jun 2004 20:22:00 -0000 [thread overview]
Message-ID: <20040605202221.16664.qmail@sourceware.org> (raw)
In-Reply-To: <20040601081718.15757.kazu@cs.umass.edu>
------- Additional Comments From law at redhat dot com 2004-06-05 20:22 -------
Subject: Re: Convert "If (a >= b) X else if
(b <= a) Y" into "if (a >= b) X".
On Tue, 2004-06-01 at 05:20, pinskia at gcc dot gnu dot org wrote:
> ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-06-01 11:20 -------
> Confirmed.
>
> Hmm, looks like jump threading needs a little improvement.
No. More correctly, we do not canonicalize equivalent expressions.
What we're looking at is canonicalizing commutative operators and
conditionals so that given two SSA_NAMEs as operands, they will
be automatically ordered such that the lowest SSA_NAME_VERSION
appears first. Given an SSA_NAME and a constant, the SSA_NAME
should come first.
A prototype of this (of course) fixes this problem. I'm still
evaluating that prototype.
jeff
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15757
next prev parent reply other threads:[~2004-06-05 20:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-01 8:17 [Bug tree-optimization/15757] New: " kazu at cs dot umass dot edu
2004-06-01 11:20 ` [Bug tree-optimization/15757] " pinskia at gcc dot gnu dot org
2004-06-05 20:22 ` law at redhat dot com [this message]
2004-06-14 20:43 ` law at gcc dot gnu dot org
2004-06-16 5:08 ` law at gcc dot gnu dot org
2004-07-10 0:45 ` pinskia at gcc dot gnu dot org
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