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Re: [patch] k8 and amdfam10 cost model tuning
On Dec 20, 2007 7:43 PM, Sjodin, Jan <Jan.Sjodin@amd.com> wrote:
> I ran rnflow with an unmodified compiler:
> (Rev: 130934 Last Changed Date: 2007-12-14)
> I could not duplicate the performance regression using the flags
> from pr31897. Below is a run on a 2.4 GHz Athlon 64 x2:
> 20 Dec 2007 11:28:05 standardgfortransingle - Compile rnflow
> command=gfortran -static -m32 -march=opteron -ffast-math -funroll-loops
> oop-linear -ftree-vectorize -mfpmath=sse -msse3 -O3 -w rnflow.f90 -o
I think you need -mfpmath=387 here (the default for 32bit compiles) to
show the performance problem.