NIOS2 HW & DIV Instructions + FPU

One other heads up, when you add the FPU floating point constants are treated as single precision. The 'normal' behavior is to have floating point constants treated as type double. So if you have constants in your code and you want to keep them represented as constants use the 'l' suffix which will ensure the constant is treated as a long double (Nios II doesn't support long doubles so this will become a double).

So instead of this:

double a = 2.3; // with the FPU enabled you'll end up with a single precision 2.3 type cast over to a double precision 2.3 (truncation could happen if the constant was very large)

Do this:

double a = 2.3l; // no type casting will occur