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[Bug tree-optimization/14741] missing transformations lead to poorly optimized code
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Jul 2007 18:09:54 -0000
- Subject: [Bug tree-optimization/14741] missing transformations lead to poorly optimized code
- References: <bug-14741-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #15 from jv244 at cam dot ac dot uk 2007-07-03 18:09 -------
current gfortran trunk is still about a factor of 8 slower than ifort:
> gfortran -O3 -ffast-math -ftree-vectorize -march=native test.f90
> ./a.out
12.9808110000000 10.2399999999998
> ifort -xT -O2 test.f90
> ./a.out
1.62810200000000 10.2399999999998
(first number is the time)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14741