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SubjectRe: [PATCH 2.4/2.5] Athlon CFLAGS
Date
On Monday 09 September 2002 01:18, Dave Jones wrote:
> On Sun, Sep 08, 2002 at 09:28:11PM +0200, Daniel Mehrmann wrote:
> > Hi Alan,
> >
> > i add for the AMD Athlon family some optimize compilerflags.
> > Gcc 3.1 and 3.2 support more specific Athlon instructions as
> > 3.0 or 2.95x. This patch for 2.4.19, 2.4.20-pre5 and 2.5.33
> > set a new "-march" flag:
> >
> > Athlon TB/Duron += -march=athlon-tbird
> > Athlon XP/Athlon4/Duron += -march=athlon-xp
> > Athlon MP += -march=athlon-mp
>
> I thought these were all just gcc aliases for the same options ?
> It's been a while since I looked at the gcc option parser, so
> I've forgotten exactly what happens, but at least you missed the
> bogus athlon-4 option.
>
> Are the gains between all these options really worth the added
> complexity ?
>
> Dave

Hi Dave,

yes, you`re right with the athlon-4 option. Well, first thing, the mobile athlon
have the same core as XP (Palomino) expect some "speed scheudle".
I never see that we support mobile chips. So i think it`s enough that we
put Athlon4 into the "XP group". I think too the new core "Thoroughbread"
should use the "XP group".

I readed the gcc documentation, gcc-3.2 only, very deep. This was the idea for this patch.
Then i looked fast into gcc-3.1/3.0/2.95x. I believe that the compiler create own code
for *every* chip-release. chip-release as: athlon-tbird, athlon-xp, ...

Also take a look into the binary code and size. It`s different.

chears,
Daniel









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