# nested.s -- example program featuring a nested loop
# This program just prints a box of *'s.
# The nested loop in a HLL could have looked like this:
#
#    for i = 1 to 10
#      begin
#        for j = 1 to 15
#          print("* ");
#        print("\n");
#      end
#
# Purpose of registers:
# $s1 = outer loop counter
# $s2 = inner loop counter
# $v0 = selects which I/O routine to perform
# $a0 = holds base address of string (when we want to print a string)

	.data
star:		.asciiz "* "
newline:	.asciiz "\n"

	.text
main:
	li $s1, 1		# set outer loop counter to 1
outer:
	li $s2, 1		# set inner loop counter to 1
inner:
	li $v0, 4		# print a star
	la $a0, star
	syscall

	addi $s2, $s2, 1	# increment inner loop counter
	ble $s2, 15, inner	# have we done 15 inner iterations?

	li $v0, 4		# print newline at end of line of stars
	la $a0, newline
	syscall

	addi $s1, $s1, 1	# increment outer loop counter
	ble $s1, 10, outer	# have we done 10 outer iterations?

	li $v0, 10		# end of program
	syscall