optimising for athlon64

[Daniel Stone]

On Sun, Mar 06, 2005 at 12:50:43PM +0000, Hamie wrote:
> I have a setup for xorg that I use on my laptop for passing optimisation 
> flags to gcc for building an optimised version of xorg 6.8.2 for a 
> pentium-m, but when I set the same flags in host.def to build for an 
> athlon64, the parameters get ignored & the defaults are used...
> 
> What should I set in host.def for an athlon64 build? The stuff I put 
> into it for my laptop is
> 
> #define DefaultGcc2i386Opt -O3 -march=pentium3 -msse2 -mmmx -msse 
> -mfpmath=sse,387 -maccumulate-outgoing-args -mno-align-stringops 
> -fomit-frame-pointer -ffast-math -funroll-all-loops -fsched-spec-load 
> -fprefetch-loop-arrays -ftracer -fmove-all-movables --param 
> max-gcse-passes=4
> 
> But defining
> 
> #define DefaultGcc2i386Opt -O3 -march=athlon64 doesn't get used... But 
> there's no docs I can find to say what the equiv is for gentoo on an 
> amd64... DefaultGcc2amd64opt? DefaultGcc2k8opt? Or somethign else? I did 
> try a few things, but the closest I got was gcc using -O2 and -O3 and 
> what looked like several conflicting flags at the same time...

Last I checked, there is none -- the DefaultGcc2*Opt section is very
inconsistent.  But, unless I'm missing something, it should be Gcc3
anyway.
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