Messages in this thread | | | Subject | Re: [2.6 patch] add a config option for -Os compilation | From | Alan Cox <> | Date | Sun, 14 Sep 2003 15:57:49 +0100 |
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On Sul, 2003-09-14 at 14:53, Wade wrote: > Adrian Bunk wrote: > > The patch below adds a config option OPTIMIZE_FOR_SIZE for telling gcc > > to use -Os instead of -O2. Besides this, it removes constructs on > > architectures that had a -Os hardcoded in their Makefiles. > > Someone told me that -Os is actually faster than -O2 for Athlons, is > that true?
On gcc 2.95 -Os was faster for most stuff. I would intuitively expect the best result to be a mix varied by function but I don't think gcc has the support to do that.
I've also not benched gcc 3.2 -Os v -O2 at real workloads - thats a nice little project for someone.
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