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On Tue, 2006-03-21 at 22:58 +1100, Con Kolivas wrote: > On Tuesday 21 March 2006 19:53, Andreas Mohr wrote: > > (and the fact that invoking a function pointer should be similarly > > expensive to a conditional) I don't think it's useful. > > Is > > *blah(); > > as expensive as > > if (conditional) > blah(); > > I don't know the answer. I just know cmp is expensive. Comments? function pointer is usually MORE expensive. for if() the processor has a change to predict the branch right, while call <register> (which is what function pointer calls end up being) are basically always mispredicted unless you have a really really fancy branch predictor... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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