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[Bug tree-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- From: "dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 05 Dec 2011 17:58:13 +0000
- Subject: [Bug tree-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- Auto-submitted: auto-generated
- References: <bug-50904-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50904
--- Comment #48 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-12-05 17:58:13 UTC ---
> Fixed (fingers crossing).
So far, so good! The runtime for induct compiled with -fprotect-parens -Ofast
went down from 14.11s to 13.14s, and compiled with -Ofast from 14.62s to 13.32s
(still ~1% slower). The timings for the other tests in the polyhedron suite
were basically unchanged (i.e., within the noise margin).
Thanks for the patch.