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[Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop
- From: "dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jun 2007 23:01:18 -0000
- Subject: [Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop
- References: <bug-32183-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #23 from dberlin at gcc dot gnu dot org 2007-06-04 23:01 -------
Subject: Re: [4.3 Regression] reassoc2 can more extra calculations into a loop
On 4 Jun 2007 22:15:46 -0000, rakdver at kam dot mff dot cuni dot cz
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #20 from rakdver at kam dot mff dot cuni dot cz 2007-06-04 22:15 -------
> Subject: Re: [4.3 Regression] reassoc2 can more extra calculations into a loop
>
> > Can anyone show that the newly added dce_loop anything useful?
>
> Yes, predictive commoning does not work as well if there is dead code
> (which is why it was added.
>
> > Can we disable it or move it after the second reassoc?
>
> Reassoc should be fixed, we should not consider workarounds like this.
Either fix or remove reassoc2 works for me :)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183