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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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