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...
regards, tom lane