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[Bug target/31897] [4.3 Regression] 30% speed regression with -m32 on Opteron with rnflow
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jul 2007 12:32:40 -0000
- Subject: [Bug target/31897] [4.3 Regression] 30% speed regression with -m32 on Opteron with rnflow
- References: <bug-31897-13404@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from ubizjak at gmail dot com 2007-07-04 12:32 -------
(In reply to comment #1)
> gfortran -ffast-math -funroll-loops -O3 -msse3 -mfpmath=387 rnflow.f90
>
> time ./a.out
> user 0m37.982s
> gfortran -ffast-math -funroll-loops -O3 -msse3 -mfpmath=387 -ftree-vectorize
> rnflow.f90
>
> time ./a.out
> user 0m55.031s
This is on XEON as in Comment #3.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31897