Manual compilation of C to MIPS R3000 Assembly - Shifts the first element of an array to position 9 (0-indexed)

right_shift.asm

#
# Manual compilation - C to MIPS R3000 Assembly
#
# Shift the first element of an array to position 9 (0-indexed)
#
# Author: Benjapol Worakan (benwrk)
#
	.data
array:	.word	0 : 20          # int A[20]	// array declaration
size:	.word	10	        # int size = 10	// actual size
i:	.word	0	        # int i = 0	// loop runner

	.text
	.globl	main
main:
	la	$t0, array      # int[] A
	lw	$t1, size	# int size
loop:
	lw      $t2, i		# // loads i
	bge     $t2, 9, exit	# while (i < 9) // "bge" = will jump to "exit" if i >= 9
	mul     $t3, $t2, 4	#       // multiply array offset/index by 4 (32-bit integer = 4 words)
	add     $t4, $t0, $t3   #       // add array offset/index to the base address
	lw      $t5, 0($t4) 	#       tmp = A[i]
	lw      $t6, 4($t4)	#       tmp2 = A[i + 1]
	sw      $t6, 0($t4)	#       A[i] = tmp2
	sw      $t5, 4($t4)	# 	A[i + 1] = tmp
	addi    $t2, $t2, 1	#	i = i + 1
	sw      $t2, i		#	// stores back i
	    			#
	j	loop		#	continue
exit:
	li	$v0, 10		# // 10 = exit syscall code
	syscall			# return

right_shift.c

int A[20];
int i = 0;
while (i < 9) {
	int tmp = A[i];
	A[i] = A[i + 1];
	A[i + 1] = tmp;
	i = i + 1;
}