Messages in this thread | | | Date | Tue, 12 Aug 2003 14:03:12 -0400 | From | Timothy Miller <> | Subject | Re: [2.6 patch] add an -Os config option |
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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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