Re: Should mmx.c be used with an AMD K6

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Wed Jul 26 2000 - 10:53:45 EST


> Hi all, the subject wanders me.
> if you look at the comment lines in mmx.c:
> /*
> * MMX 3DNow! library helper functions
> *
> * To do:
> * We can use MMX just for prefetch in IRQ's. This may be a win.
> * (reported so on K6-III)
>
> I have a K6-III.

Its a tiny difference (2%) and not clearly a win of any kind in all cases.
Its noted in case anyone wishes to explore further. On the Athlong the MMX
based copy is >25% faster

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