Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Tom Lane wrote:
> >> with -ffast-math gcc will "improve" it to
> >>
> >> int hour = time * 0.000277777777777778;
>
> > Hard to imagine why anyone would want such an optimization. How much
> > faster could it possibly be?
>
> Back in ye bad olde days, there was probably an order-of-magnitude
> difference between the speed of a float multiply and that of a float
> divide; so this used to be a pretty standard sort of optimization.
> I can remember doing the equivalent thing by hand in source code.
>
> On modern hardware I doubt it makes much difference...
And you would have to do a heck of a lot of them to see a difference.
--
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