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From: "dberlin at dberlin dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop
Date: Tue, 05 Jun 2007 00:12:00 -0000	[thread overview]
Message-ID: <20070605001215.19640.qmail@sourceware.org> (raw)
In-Reply-To: <bug-32183-682@http.gcc.gnu.org/bugzilla/>



------- Comment #27 from dberlin at gcc dot gnu dot org  2007-06-05 00:12 -------
Subject: Re:  [4.3 Regression] reassoc2 can more extra calculations into a loop

On 4 Jun 2007 23:35:19 -0000, rakdver at gcc dot gnu dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #26 from rakdver at gcc dot gnu dot org  2007-06-04 23:35 -------
> Created an attachment (id=13656)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13656&action=view)
>  --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13656&action=view)
> patch preventing reassociation across loop boundaries
>

You may want to turn this on only for reassoc2.
For reassoc1, we get benefit from the identities and linearization it
performs, and PRE will move out what needs to be moved out.

It's only the reassoc after loop opts are being performed that
shouldn't be playing with calculations in loops.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183


  parent reply	other threads:[~2007-06-05  0:12 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-01 21:35 [Bug tree-optimization/32183] New: Gcc 4.3 revision 125030 miscompiles 482.sphinx3 in SPEC CPU 2006 hjl at lucon dot org
2007-06-01 22:13 ` [Bug tree-optimization/32183] " hjl at lucon dot org
2007-06-01 23:09 ` hjl at lucon dot org
2007-06-01 23:13 ` rakdver at gcc dot gnu dot org
2007-06-02  0:01 ` [Bug tree-optimization/32183] -fast-math causes a missed optimization to happen pinskia at gcc dot gnu dot org
2007-06-02  0:11 ` hjl at lucon dot org
2007-06-02  0:21 ` [Bug tree-optimization/32183] reassoc can more extra calculations into a loop pinskia at gcc dot gnu dot org
2007-06-02  0:24 ` pinskia at gcc dot gnu dot org
2007-06-02  0:26 ` pinskia at gcc dot gnu dot org
2007-06-02  0:38 ` [Bug tree-optimization/32183] [4.3 Regression] reassoc2 " pinskia at gcc dot gnu dot org
2007-06-02  0:43 ` hjl at lucon dot org
2007-06-02  0:46 ` pinskia at gcc dot gnu dot org
2007-06-02  0:56 ` pinskia at gcc dot gnu dot org
2007-06-02  0:59 ` pinskia at gcc dot gnu dot org
2007-06-02  2:00 ` hjl at lucon dot org
2007-06-02  2:24 ` pinskia at gcc dot gnu dot org
2007-06-02  7:49 ` rakdver at kam dot mff dot cuni dot cz
2007-06-02 14:20 ` hjl at lucon dot org
2007-06-03 22:41 ` hjl at lucon dot org
2007-06-04 21:14 ` hjl at lucon dot org
2007-06-04 21:39 ` hjl at lucon dot org
2007-06-04 22:15 ` rakdver at kam dot mff dot cuni dot cz
2007-06-04 22:19 ` hjl at lucon dot org
2007-06-04 22:39 ` rakdver at kam dot mff dot cuni dot cz
2007-06-04 22:45 ` rakdver at gcc dot gnu dot org
2007-06-04 23:01 ` dberlin at dberlin dot org
2007-06-04 23:23 ` rakdver at kam dot mff dot cuni dot cz
2007-06-04 23:34 ` rakdver at gcc dot gnu dot org
2007-06-04 23:35 ` rakdver at gcc dot gnu dot org
2007-06-05  0:12 ` dberlin at dberlin dot org [this message]
2007-06-05  0:15 ` hjl at lucon dot org
2007-06-05 16:45 ` hjl at lucon dot org
2007-06-07  3:16 ` hjl at lucon dot org
2007-06-29 18:38 ` mmitchel at gcc dot gnu dot org
2007-09-08  6:47 ` hjl at gcc dot gnu dot org
2007-10-10  4:08 ` hjl at lucon dot org
2007-10-10  8:58 ` steven at gcc dot gnu dot org
2007-10-10 17:43   ` Daniel Berlin
2007-10-10 17:44 ` dberlin at dberlin dot org

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