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Re: C Optimization Tests, 1 May 2004, tree-ssa/3.5/3.4/icc
On Sun, May 02, 2004 at 04:00:03PM -0400, Scott Robert Ladd wrote:
> Kaveh R. Ghazi wrote:
> >Scott -- I'm curious how mainline performs on all these tests with the
> >patch below. Would you please try it out? If we can demonstrate an
> >overall win, I'll submit it for installation.
>
> GCC Mainline, Pentium 4
>
> default math with -mfpmath=sse
> test no patch patched no patch patched
> ---- -------- -------- -------- --------
> alma 64.3 42.4 68.2 44.7
> evo 52.9 52.8 79.5 79.8
> fft 34.6 32.0 34.5 33.4
> huff 16.0 16.0 16.7 16.3
> lin 26.2 22.9 25.9 23.7
> mat1 7.5 7.5 8.0 7.9
> mole 32.8 31.3 30.6 22.4
> tree 25.0 24.5 25.7 25.6
> -------- -------- -------- --------
> total 259.3 229.5 289.0 253.9
>
> I'd say your patch is a winner, at least as far as the Pentium 4 is
> concerned. On the Opteron, your patch (and -mfpmath=sse, BTW) made no
> difference in generated code speed.
>
> I'm certain other people will notice the -mfpmath is pessimistic on the
> Pentium 4. Being somewhat pressed for time today, I haven't figured out
> why yet,
>
Have you added -march=pentium4 to -mfpmath?
H.J.