Messages in this thread |  | | Date | Mon, 9 Sep 2002 02:46:45 +0200 | From | Stephane Wirtel <> | Subject | Re: [PATCH 2.4/2.5] Athlon CFLAGS |
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in your patch, you don't check the gcc version. if i run with a gcc-2.95.3, you will be a compile error
On Mon, Sep 09, 2002 at 02:13:10AM +0200, Daniel Mehrmann wrote: > 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 > > > > > > > > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Stephane Wirtel <stephane.wirtel@belgacom.net> Web : www.linux-mons.be "Linux Is Not UniX !!!" - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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