Messages in this thread |  | | Date | Sun, 08 Sep 2002 20:37:01 -0400 | From | Jeff Garzik <> | Subject | Re: [PATCH 2.4/2.5] Athlon CFLAGS |
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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 >
They all have the same scheduling AFAICS, there are minor variations between athlon, athlon-tbird, and the rest:
> > {"athlon", PROCESSOR_ATHLON, PTA_MMX | PTA_PREFETCH_SSE | PTA_3DNOW > | PTA_3DNOW_A}, > {"athlon-tbird", PROCESSOR_ATHLON, PTA_MMX | PTA_PREFETCH_SSE > | PTA_3DNOW | PTA_3DNOW_A}, > {"athlon-4", PROCESSOR_ATHLON, PTA_MMX | PTA_PREFETCH_SSE | PTA_3DNOW > | PTA_3DNOW_A | PTA_SSE}, > {"athlon-xp", PROCESSOR_ATHLON, PTA_MMX | PTA_PREFETCH_SSE | PTA_3DNOW > | PTA_3DNOW_A | PTA_SSE}, > {"athlon-mp", PROCESSOR_ATHLON, PTA_MMX | PTA_PREFETCH_SSE | PTA_3DNOW > | PTA_3DNOW_A | PTA_SSE},
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