Reinterpret float as int in CUDA

FloatAsInt.cu

// 1. Using union
__device__ int floatAsInt( float fval )
{
    union FloatInt {
        float f;
        int   i;
    };

    FloatInt fi;
    fi.f = fval;
    return fi.i;
}

// 2. Using pointer
ival = *( ( int* ) &fval );

// 3. Using CUDA intrinsic function
ival = __float_as_int( fval );