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[Bug tree-optimization/38401] TreeSSA-PRE load after store missed optimization
- From: "rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 13 Jan 2009 14:29:00 -0000
- Subject: [Bug tree-optimization/38401] TreeSSA-PRE load after store missed optimization
- References: <bug-38401-16914@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #22 from rguenther at suse dot de 2009-01-13 14:29 -------
Subject: Re: TreeSSA-PRE load after store missed
optimization
On Tue, 13 Jan 2009, amylaar at gcc dot gnu dot org wrote:
> ------- Comment #21 from amylaar at gcc dot gnu dot org 2009-01-13 14:11 -------
> (In reply to comment #20)
> > office: 1.39% worse
>
> Actually, this is the EEMBC version with bezier01, where the entire benchmark
> gets optized away and thus tiny changes in the cost of the set-up code make
> noticeable differences. Comparing the geometric means with bezier01 left out
> gives:
>
> automotive: 5.73% improvement
> consumer: 0.04% improvement
> networking: 0.37% improvement
> office: 0.90% worse
> telecom: 0.00% worse
If you post a patch to add the option to enable/disable partial-PRE I will
happily review and approve it for 4.4.
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38401