Callum Lerwick wrote:
> Going -O3 rather than -O2 is going to make a bigger difference than
> anything else. If you want to improve performance, you need to run
> profiles, locate performance critical bits of code, figure out if -O3 is
> beneficial, and/or write some hand tuned assembly/intrinsic code.
>
> Not to mention, the biggest performance problem on modern processors is
> memory. Minimizing cache thrashing is way more important than what
> instructions you use. Optimize data structures before code.
That's actually an argument for investigating -Os, not -O3.
Kevin Kofler
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