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[Bug tree-optimization/71815] SLSR misses several PHI candidate cases
- From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 10 Aug 2016 16:08:29 +0000
- Subject: [Bug tree-optimization/71815] SLSR misses several PHI candidate cases
- Auto-submitted: auto-generated
- References: <bug-71815-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71815
--- Comment #9 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
I'm not comfortable with the results of the patch. Overall I see a slight
improvement for SPECint CPU2006 and a slightly larger degradation for SPECfp
CPU2006. But there are some individual slowdowns that are unacceptable:
435.gromacs: -8.7%
436.cactusADM: -3.0%
On the other hand:
403.gcc: +4.6%
All other results within +/- 2%.
I'm going to hold off on this until I can investigate the 435.gromacs slowdown.