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From: "dnovillo at google dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/33099] [4.2 Regression] Scalar evolutions confusing VRP with pointer values that wrap around
Date: Fri, 17 Aug 2007 20:38:00 -0000 [thread overview]
Message-ID: <20070817203753.15237.qmail@sourceware.org> (raw)
In-Reply-To: <bug-33099-91@http.gcc.gnu.org/bugzilla/>
------- Comment #5 from dnovillo at google dot com 2007-08-17 20:37 -------
Subject: Re: [4.2 Regression] Scalar evolutions
confusing VRP with pointer values that wrap around
On 8/17/07 4:34 PM, pinskia at gcc dot gnu dot org wrote:
> ------- Comment #4 from pinskia at gcc dot gnu dot org 2007-08-17 20:34 -------
> Oh you are correct but this still worked in 4.1.1 though, I have not looked
> into what changed between 4.1.1 and 4.2.0 with respect of scev yet.
Since you are looking, two things to check for: (1) IL representation
for the pointer subtraction, and (2) SCEV may have returned an unknown
chrec back in 4.1. Or maybe we still didn't consider pointers to not-wrap.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33099
next prev parent reply other threads:[~2007-08-17 20:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-17 19:47 [Bug tree-optimization/33099] New: " dnovillo at gcc dot gnu dot org
2007-08-17 20:19 ` [Bug tree-optimization/33099] [4.2 Regression] " pinskia at gcc dot gnu dot org
2007-08-17 20:21 ` pinskia at gcc dot gnu dot org
2007-08-17 20:28 ` dnovillo at google dot com
2007-08-17 20:34 ` pinskia at gcc dot gnu dot org
2007-08-17 20:38 ` dnovillo at google dot com [this message]
2007-08-17 20:43 ` pinskia at gcc dot gnu dot org
2007-08-18 13:55 ` rguenth at gcc dot gnu dot org
2007-09-05 1:05 ` mmitchel at gcc dot gnu dot org
2007-09-21 13:55 ` rguenth at gcc dot gnu dot org
2007-10-09 19:27 ` mmitchel at gcc dot gnu dot org
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
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