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List:       freedesktop-xorg
Subject:    Re: pixman with and without SSE2 benchmarks?
From:       Soeren Sandmann <sandmann () daimi ! au ! dk>
Date:       2008-09-30 14:57:35
Message-ID: ye84p3xof4w.fsf () camel23 ! daimi ! au ! dk
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Juliusz Chroboczek <Juliusz.Chroboczek@pps.jussieu.fr> writes:

> Note that this is on core 2, which has magnificent SSE performance.
> I haven't tried it, but I'm willing to bet that on Pentium-M and
> Pentium 4, the results are similar for SSE and MMX.

Actually they are not, but that's because gcc 4 generates much worse
code for MMX than it does for SSE2. The generated MMX code includes
bizarre stuff like this:

        movq    %mm0, -24(%ebp)
        movq    -24(%ebp), %mm0
        psllq   $16, %mm0
        movq    -24(%ebp), %mm1


Soren
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