Re: [2.6 patch] add an -Os config option

[Timothy Miller]

Alan Cox wrote:
> On Llu, 2003-08-11 at 22:11, Adrian Bunk wrote:
>
> > +config OPTIMIZE_FOR_SIZE
> > +	bool "Optimize for size" if EMBEDDED
> > +	default n
> > +	help
> > +	  Enabling this option will pass "-Os" instead of "-O2" to gcc
> > +	  resulting in a smaller kernel.
> > +
> > +	  The resulting kernel might be significantly slower.
>
>
> With most of the gcc's I tried -Os was faster.


Why is -Os faster?  Fewer cache misses?

Wouldn't that make -O2 kinda pointless?  It seems kinda futile to 
optimize for speed just to have it come out slower.


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