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[Bug rtl-optimization/69847] Spec 2006 403.gcc slows down with -mlra vs. reload on PowerPC
- 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: Tue, 02 Aug 2016 13:23:50 +0000
- Subject: [Bug rtl-optimization/69847] Spec 2006 403.gcc slows down with -mlra vs. reload on PowerPC
- Auto-submitted: auto-generated
- References: <bug-69847-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69847
--- Comment #17 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Vlad, the patch checks out very well on powerpc64le. 403.gcc no longer
degrades. We are seeing some very nice improvements from LRA over reload on a
few benchmarks (435.gromacs leads the way with +9.5%). Everything in CPU2006
is positive or noise except for 401.bzip2, which shows about a 2% degradation.
We'll look into that separately to see if it's real and open another bug if
there is anything to report.
Once the patch is in place, I think we will be ready to switch the POWER server
targets to use LRA by default.
Thanks! Excellent results.
Bill