This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: PRE (sometimes) confuses ivopts/scev?

From: Daniel Berlin <dberlin at dberlin dot org>
To: Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>
Cc: Ulrich Weigand <uweigand at de dot ibm dot com>, gcc at gcc dot gnu dot org
Date: Tue, 25 Jan 2005 08:46:12 -0500 (EST)
Subject: Re: PRE (sometimes) confuses ivopts/scev?
References: <Pine.LNX.4.44.0501251003230.16464-100000@alwazn.tat.physik.uni-tuebingen.de>

if (firstinsideloop ^ secondinsideloop)
This is pretty much what i'm testing now.
This helps - though for the particular function there is now
Insertions:0
New PHIs:0
Eliminated:0
Constified:0
but I didn't expect any obvious redundant computations in the
function anyway.

However, this patch causes us to miss the invariant code in ssa-pre-3.c, so we need *some* test there that avoids wraparounds while still catching invariant code.

Follow-Ups:
- Re: PRE (sometimes) confuses ivopts/scev?
  - From: Richard Guenther

References:
- Re: PRE (sometimes) confuses ivopts/scev?
  - From: Richard Guenther

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]