CFLAGS, optimasations, howto ?
knoglen at ifrance.com
Wed Jan 22 04:06:54 PST 2003
On Wednesday 22 January 2003 09:06 am, you wrote:
> Hi folks,
> I set up my lfs successful whithout setting optimasations. Now I want to
> use this to optimise my system on specific hardware.
> I plan to setup the envoirment CFLAGS and CPP... (?) variable. I can not
> find a good how to for the best optimasations. I have a pentium IV and a
> AMD k6, manny others will follow. I saw that there is the -arch flag, but
> if this all ?? Can I make grater optimasations, whith oter flags ? Which
> one ?
> Can anyone post a good refferencces ? Or give a explaination and a list of
> all flag that I can set.
I would start here.
And when you are comfortable using that, you can look here for more
optimizations to play with.
> Secondary: if there is a rule how much speed I earn whith optimasations ?
> So just a ( mostly 1/6, 1/8m, 1/4 ) thing wouod help.
How much speed you gain depends on your arch and on how agressively you
optimize. I really dont know how much of a speed improvement it gives you. I
have never tried to measure it.
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