fsub{ls}
Subtract stack element 7 from stack element 0 and return the difference to stack element 0.
fsub %st(7), %st
fsubp
Subtract stack element 7 from stack element 0 and return the difference to stack element 7, then pop the stack.
fsubp %st, %st(7)
fsubr{ls}
Subtract stack element 0 from stack element 7 and return the difference to stack element 0.
fsubr %st(7), %st
fsubrp
Subtract stack element 0 from stack element 7 and return the difference to stack element 7, then pop the stack.
fsubrp %st, %st(7)
fisubrp
Subtract stack element 0 from the integer contents of register ECX (with an offset of 2) and return the difference to register ECX, then pop the stack.
fisubrp 2(%ecx)
fisubr{l}
Subtract stack element 0 from the integer contents of register ECX (with an offset of 2) and return the difference to stack element 0.
fisubr 2(%ecx)