Re: [2.6 patch] add an -Os config option
From: Timothy Miller
Date: Tue Aug 12 2003 - 12:54:14 EST
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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