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[Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop
- From: "hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jun 2007 22:19:17 -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 #21 from hjl at lucon dot org 2007-06-04 22:19 -------
(In reply to comment #20)
> 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.
>
But predictive commoning isn't enabled at -O2, why add it for -O2? What does
it give us at -O2?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183