Messages in this thread | | | Date | Fri, 24 May 2002 19:00:12 +0100 | From | Christoph Hellwig <> | Subject | Re: Compiling 2.2.19 with -O3 flag |
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On Fri, May 24, 2002 at 10:55:20AM -0700, Robert Love wrote: > I know this...maybe I am not being clear. I realize -Os is a derivate > of -O2, but is it not an interesting note if -Os can be as fast (or > faster) than -O2 and still generate smaller binaries? That is my point.
I've seen it beeing faster with gcc 2.95. Alan's point was (and I think the explanation is plausible) is that it is faster exactly _because_ it produces smaller code due to the instruction cache behaviour of many current CPUs.
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