Can't find it now, but I recall I should avoid using double variables in iPhone coding for (poor) performance reasons? Is this true? Are there any other known problems with some variable types?
+4
A:
Using float or double on embedded devices is slow when there is no FPU.
About floating point performance on the iPhone, you can have a look at Break That Thumb For Best iPhone Performance and Cranking Up Floating Point Performance To 11: it deals with floating point performance and floating point operations causing the program to switch back and forth between Thumb mode and regular 32-bit mode.
See also Squeezing Every Drop Of Performance Out Of The iPhone.
Gregory Pakosz
2009-12-23 08:08:07