Convert Integer to Double in MIPS

Question

I want to divide two values that are in $tn registers.

I have to divide these two values to get a double result but the function div only r

Answer 1

You have to move and convert the integer stored in a general purpose register to floating point or double register.

Assuming your number is stored in $a1, To convert to a double pair ($f12, $f13) you have to issue:

  mtc1.d $a1, $f12
  cvt.d.w $f12, $f12

And to convert it to a single precision float ($f12) you'd do:

  mtc1 $a1, $f12
  cvt.s.w $f12, $f12

Then you can use div.d or div.s to do floating-point division and get a floating point result.