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[Bug target/38306] [4.4/4.5/4.6 Regression] 15% slowdown w.r.t. 4.3 of computational kernel on some architectures
- From: "Joost.VandeVondele at pci dot uzh.ch" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 20 Feb 2011 16:28:03 +0000
- Subject: [Bug target/38306] [4.4/4.5/4.6 Regression] 15% slowdown w.r.t. 4.3 of computational kernel on some architectures
- Auto-submitted: auto-generated
- References: <bug-38306-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38306
--- Comment #20 from Joost VandeVondele <Joost.VandeVondele at pci dot uzh.ch> 2011-02-20 16:28:00 UTC ---
additionally for trunk, lto/profile-use seem not to help:
> gfortran -O3 -march=native -funroll-loops -ffast-math -flto -fprofile-use test.f90 ; ./a.out
Time for evaluation [s]: 4.664
> gfortran -O3 -march=native -funroll-loops -ffast-math -fprofile-use test.f90 ; ./a.out
Time for evaluation [s]: 4.665