Re: RFC: [2.6 patch] better i386 CPU selection

Adrian Bunk
2003-09-12T22:51:50Z

On Fri, Sep 12, 2003 at 10:09:20PM +0200, Mikael Pettersson wrote:
>...
> > > - Which CPUs exactly need X86_ALIGNMENT_16?
> >
> >Unsure. This could use testing on a few systems.
>
> K7s and P5s (and 486s too if I remember correctly) strongly prefer
> code entry points and loop labels to be 16-byte aligned. This is
> due to the way code is fetched from L1.
>...

Hm, that's pretty different from the definition in -test5:

config X86_ALIGNMENT_16
bool
depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII ||
MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2
default y

> /Mikael

cu
Adrian

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