added

section01/Lec15/fact_localvar.s

+.text
+
+
+main:
+	li $a0, 10
+	jal fact
+	
+	move $s0, $v0
+	
+	li $v0, 10
+	syscall		# exit
+	
+	
+fact:
+	addi 	$sp, $sp, -12	# allocate stack
+	sw 	$ra, 4($sp)
+	sw	$a0, 0($sp)	# setup stack, 8($sp) is un-initialized
+	
+	ble	$a0, 1, L1	# if a0 <= 1, goto L1
+	
+				# else recurse
+	addi 	$a0, $a0, -1		
+	jal	fact		# find fact (a0 - 1)
+	
+	lw	$a0, 0($sp)	# get our a0 back
+	mul	$t0, $v0, $a0	# t0 = a0 * fact (a0 - 1)
+	sw	$t0, 8($sp)	# store t0 into our local variable on the stack
+	j	return
+	
+L1:
+	li 	$t0, 1		# setup a register with 1	
+	sw	$t0, 8($sp)	# store 1 into our local variable
+				# fall through to the return
+	
+return:
+	lw	$v0, 8($sp)	# load return value from the local variable
+	lw	$ra, 4($sp)	# load the return address
+	addi	$sp, $sp, 12	# pop stack
+	jr 	$ra		# return
\ No newline at end of file