Comparing IEEE floats and doubles for equality

Question

What is the best method for comparing IEEE floats and doubles for equality? I have heard of several methods, but I wanted to see what the community thought.

Answer 1

@DrPizza: I am no performance guru but I would expect fixed point operations to be quicker than floating point operations (in most cases).

It rather depends on what you are doing with them. A fixed-point type with the same range as an IEEE float would be many many times slower (and many times larger).

Things suitable for floats:

3D graphics, physics/engineering, simulation, climate simulation....