A monotonic transformation from IEEE 754 floats to unsigned ints

main.md

You need to get to the bit representation of the float, and then:

inline unsigned int float2fint(unsigned int f) {
    return f ^ ((-(f >> 31)) | 0x80000000);
}

Callahan et al. used this trick in this paper.

Caveats:

1. 32-bit float only. I'm sure there are generalizations for doubles, etc.
2. No idea what it does to NaN's (although I've a vague recollection that this does the right thing to denormals. I could be wrong)