When to use Fixed Point these days

Question

For intense number-crunching i\'m considering using fixed point instead of floating point. Of course it\'ll matter how many bytes the fixed point type is in size, on what CPU i

Answer 1

Another reason to use fixed-point is that ARM devices, like mobile phones and tablets, lack of FPU (at least many of them).

For developing real-time applications it makes sense to optimize functions using fixed-point arithmetic. There are implementations of FFTs (Fast Fourier Transform), very importan for graphics, that base its improvements on efficiency on relying on floating point arithmetic.