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[Bug tree-optimization/79389] [7 Regression] 30% performance regression in SciMark2 MonteCarlo
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 22 Feb 2017 16:23:55 +0000
- Subject: [Bug tree-optimization/79389] [7 Regression] 30% performance regression in SciMark2 MonteCarlo
- Auto-submitted: auto-generated
- References: <bug-79389-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79389
--- Comment #11 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #10)
> Created attachment 40815 [details]
> gcc7-pr79389.patch
>
> Full untested patch.
I can confirm that MonteCarlo benchmark considerably improves with -O2, but
please note that your patch is ineffective with -Ofast for some reason, and the
testcase still compiles to a jump.