Better way to prevent divide by zero?

[sonigen]

if(f != f) {
//do something here like giving it a particular value o so..
}

Best to use these for checking nan / finite..

__isfinite();
__isnan();

On MSVC at least, not sure if it's the same on other compilers.

[camsr]

Don't know if this idea could work for you:

Code: Select all

const float eps = 1e-29f; // Or any other epsilon you consider appropriate

float safeDivision(float numerator, float denominator)
{
    float safeDenominator = (denominator > 0.0f) ? max(eps, denominator) : min(-eps, denominator);
    return numerator / safeDenominator;
}

Maybe some experienced coder around here can do this with some bit twiddling black magic

Bit twiddling incurs a latency, but a mask could be applied with SSE instead.
Which raises my next question, does condition logic with SSE (floats) use SSE or the ALU?