int to float | GameDev.net

Original Post

116

Aug 22, 2000 at 5:40 AM

If i cast an int to a float, is there the same performance problems of float to int? I mean, all it has to do is whack a .00 onto the end of the number..

----------------------------- -cow_in_the_well http://cowswell.gda.ods.org/ - Don't Panic -

Knarkles

Aug 22, 2000 at 5:42 AM

No, that''s not all it has to do, because floats are stored in a totally different way than integers. But yes, I think it''s still faster that way round, I don''t know by how much.

-Jussi

Ironblayde

Aug 23, 2000 at 5:20 AM

I''m not sure, but I''m guessing that it would be about the same. Converting an integer to a float, like Selkrank said, is more than just tacking on a decimal point. Floats are stored as a biased exponent, a sign bit, and a mantissa; so it seems to me that converting int->float and float->int would take about the same amount of time, since it''s all the same steps, only taken in reverse. Just a guess.

-Ironblayde
Aeon Software

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