Float or Double?

Question

Which is faster, double or float, when preforming arithimic (+-*/%), and is it worth just using float for memory reasons? Precision is not an issue much of an issue.

Answer 1

http://developer.android.com/training/articles/perf-tips.html#AvoidFloat

Avoid Using Floating-Point

As a rule of thumb, floating-point is about 2x slower than integer on Android-powered devices.

In speed terms, there's no difference between float and double on the more modern hardware. Space-wise, double is 2x larger. As with desktop machines, assuming space isn't an issue, you should prefer double to float.

Also, even for integers, some processors have hardware multiply but lack hardware divide. In such cases, integer division and modulus operations are performed in software—something to think about if you're designing a hash table or doing lots of math.