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Re: Advice about using SIMD extensions
On Fri, 2005-02-25 at 12:18 +0100, Brian Budge wrote:
> Hmmm, I doubt that. It seems very important that your data be in
> registers when you want to do arithmetic on it.
That's register allocation, not scheduling :)
>
> I can see that if your data was already in registers, maybe a
> "randomized" instruction ordering would perform okay, but loading the
> data properly is time consuming. At least these are the things I've
> observed.
>
stevenb was the source of this information for me, so maybe he can
confirm it (Steven, i mentioned to brian that icc 8.1 doesn't do
scheduling for the pentium4 anymore, and he doubts it :P)