I am trying to run the following code in assembly:
mov %si, %ax
mov $15, %si
div %si
mov %eax, %esi
When I make my program, it compiles, but at runtime it gives me a floating point exception.
I tried to replace the last line's parameters by %ah and %si.
Briefly, I am trying to divide %esi by 15. I only want an int, and have no need for a double.
Thank you
The div instruction divides the double-word parameter dx:ax by the operand. The dx:ax form means the doubleword formed by regarding ax as the low word and dx as the high word. If the quotient is too large to fit into a word, it will throw that exception.
Reference: https://www.felixcloutier.com/x86/div
What do you have in the dx register? Most likely dx:ax divided by 15 does not fit in a 16-bit word.