ppc_8xx-gcc 2.95.3 Monta Vista does not do ANY loop unrolling

Joakim Tjernlund Joakim.Tjernlund at lumentis.se
Wed Nov 13 08:33:07 EST 2002

> From one of our compiler guys in relationship to your original question:
>  > Later Alan Cox pointed out that my changes makes x86 run slower and it turns
>  > out that on x86 and a fairly new gcc will automatically unroll loops 'where
>  > appropriate'
> Fairly new: 3.3-pre only.

That's very new!
> Now I wonder:
>  > Is this a gcc 2.95.3, PPC or Monta Vista limitation?
> 2.95.3.
>  > Which compiler will do unrolling 'where appropriate' for 8xx PPC and
>  > Where can I get a precompiled version?
> Nowhere, nor is using it for your kernels necessarily a good idea if
> you don't have compiler experience.
> > I know Dan is handling the enet stuff, but since you both work
> Dan no longer works for MontaVista.  (And has not for some time now.)
yes, my mistake.

Thanks for the info


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