float / double support in Python?
Erik Max Francis
max at alcyone.com
Fri Feb 7 10:12:37 CET 2003
Brandon Van Every wrote:
> I hope to - rather I have - introduced a statement of fact about a
> particular problem domain. For instance, DirectX Graphics only takes
> floats. I have no interest in using 8-byte doubles for my game code.
> from API compatibility issues, it's piggish in terms of both space and
The irony of all this is that most modern FPUs do computations with the
full-width floating point types (C doubles instead of C floats), so
sometimes doing arithmetic in C floats rather than C doubles is
counterintuitively _more_ expensive than doing them in doubles directly,
since all the usage of floats gains you is the overhead of conversions.
3D APIs tend to offer C float interfaces (good ones like OpenGL offer
both) usually only to save on bus traffic.
Erik Max Francis / max at alcyone.com / http://www.alcyone.com/max/
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