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


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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