;
;	CPE 221 Assembly Example
;	2/29/2016
;	This program multiplies two unsigned numbers by repeated addition
;

data:		.org	200
num1:		.dc	8			; positive number
num2:		.dc	9			; positive number
result:	.dw	1
		
code:		.org	1000
		lar 	r30, again
		lar 	r29, done

		ld	r1, num1		; Load num1 into r1.
		ld	r2, num2		; Load num2 into r2.
		sub	r3, r3, r3		; r3 holds result, initialize to 0.
		brzr	r29, r1		; If r1 is 0, result is zero, done.
		brzr	r29, r2		; If r2 is 0, result is zero, done.
again:	add	r3, r3, r1		; Add r1 to r3.
		addi	r2, r2, -1		; Decrement r4.
		brnz	r30, r2		; If r4 is 0, done
done:		st	r3, result		; Store r3 in result.
		stop