Assembly homework solutions for the Computer Organization and Computer Architecture course.

HW3-3.asm

	.data
array:	.word	0 : 50
size:	.word	50
space:	.asciiz	" "
	.text
	.globl main
main:
init_value_init:
	lw	$t3, size
	la 	$t8, array
	move	$t0, $zero
init_value_loop:
	mul	$t1, $t0, 4
	sw	$t0, array($t1)
	addi	$t0, $t0, 1
	blt	$t0, $t3, init_value_loop

	li	$t0, 0
	move	$t1, $zero

logic:
#	sll	$t2, $t0, 2	# bit shift left << 2
	mul	$t2, $t0, 4	# i = i * 4
	add	$t2, $t2, $t8	# y = a[i]
	
	lw	$t1, 4($t2)	
	lw	$t3, ($t2)
	sw	$t3, 4($t2)
	sw	$t1, ($t2)
	
print_loop_init:
	move	$t0, $zero
	lw	$t1, size
	la	$t8, array
print_loop:
	mul	$t2, $t0, 4
	li	$v0, 1
	lw	$a0, array($t2)
	syscall
	li	$v0, 4
	la	$a0, space
	syscall
	addi	$t0, $t0, 1
	blt	$t0, $t1, print_loop
	
		

HW3-4.asm

	.data
array:	.word	0 : 50
size:	.word	50
space:	.asciiz	" "
nl:	.asciiz "\n"
	.text
	.globl main
main:
init_value_init:
	lw	$t3, size
	la 	$t8, array
	move	$t0, $zero
init_value_loop:
	mul	$t1, $t0, 4
	sw	$t0, array($t1)
	addi	$t0, $t0, 1
	blt	$t0, $t3, init_value_loop

	li	$t0, 0
	move	$t1, $zero
	
logic:
	lw	$t1, ($t8)
	lw	$t2, 4($t8)
	sw	$t2, ($t8)
	lw	$t2, 8($t8)
	sw	$t2, 4($t8)
	sw	$t1, 8($t8)
	slt	$t1, $t2, $zero
	
	li	$v0, 1
	move	$a0, $t1
	syscall
	
	li	$v0, 4
	la	$a0, nl
	syscall
	
print_loop_init:
	move	$t0, $zero
	lw	$t1, size
	la	$t8, array
print_loop:
	mul	$t2, $t0, 4
	li	$v0, 1
	lw	$a0, array($t2)
	syscall
	li	$v0, 4
	la	$a0, space
	syscall
	addi	$t0, $t0, 1
	blt	$t0, $t1, print_loop
	
		

HW3-5-alt.asm

	.data
array:	.word	0 : 50
size:	.word	50
space:	.asciiz	" "
nl:	.asciiz "\n"
	.text
	.globl main
main:
init_value_init:
	lw	$t3, size
	la 	$t8, array
	move	$t0, $zero
init_value_loop:
	mul	$t1, $t0, 4
	sw	$t0, array($t1)
	addi	$t0, $t0, 1
	blt	$t0, $t3, init_value_loop

	li	$t0, 2
	move	$t1, $zero
	
logic:
	sll	$t2, $t0, 2
	add	$t2, $t2, $t8
	lw	$t3, ($t2)
	beq	$t3, 1, l1
	beq	$t3, 2, l2
	j	l3
l1:
	addi	$t1, $t1, 1
	j	l4
l2:
	addi	$t1, $t1, 2
	j	l4
l3:
	addi	$t1, $t1, 3
l4:
	li	$v0, 1
	move	$a0, $t1
	syscall
	
	li	$v0, 4
	la	$a0, nl
	syscall
	
print_loop_init:
	move	$t0, $zero
	lw	$t1, size
	la	$t8, array
print_loop:
	mul	$t2, $t0, 4
	li	$v0, 1
	lw	$a0, array($t2)
	syscall
	li	$v0, 4
	la	$a0, space
	syscall
	addi	$t0, $t0, 1
	blt	$t0, $t1, print_loop

exit:
	li	$v0, 10
	syscall

HW3-5.asm

	.data
array:	.word	0 : 50
size:	.word	50
space:	.asciiz	" "
nl:	.asciiz "\n"
	.text
	.globl main
main:
init_value_init:
	lw	$t3, size
	la 	$t8, array
	move	$t0, $zero
init_value_loop:
	mul	$t1, $t0, 4
	sw	$t0, array($t1)
	addi	$t0, $t0, 1
	blt	$t0, $t3, init_value_loop

	li	$t0, 0
	move	$t1, $zero
	
logic:
	mul	$t2, $t0, 4
	add	$t2, $t2, $t8
	lw	$t3, ($t2)
	
	bne	$t3, 1, skip_plus_1
	addi	$t1, $t1, 1
	j	skip_plus_3	
skip_plus_1:
	bne	$t3, 2, skip_plus_2
	addi	$t1, $t1, 2
	j	skip_plus_3
skip_plus_2:
	addi	$t1, $t1, 3
skip_plus_3:
	li	$v0, 1
	move	$a0, $t1
	syscall
	
	li	$v0, 4
	la	$a0, nl
	syscall
	
print_loop_init:
	move	$t0, $zero
	lw	$t1, size
	la	$t8, array
print_loop:
	mul	$t2, $t0, 4
	li	$v0, 1
	lw	$a0, array($t2)
	syscall
	li	$v0, 4
	la	$a0, space
	syscall
	addi	$t0, $t0, 1
	blt	$t0, $t1, print_loop

exit:
	li	$v0, 10
	syscall

HW3-6.asm

	.data
array:	.word	0 : 1000
size:	.word	1000
space:	.asciiz	" "
nl:	.asciiz "\n"
	.text
	.globl main
main:
init_value_init:
	lw	$t3, size
	la 	$t8, array
	move	$t0, $zero
init_value_loop:
	mul	$t1, $t0, 4
	sw	$t0, array($t1)
	addi	$t0, $t0, 1
	blt	$t0, $t3, init_value_loop
	
	
	li	$t0, 0
	move	$t1, $zero
	
	lw	$t4, size
logic_loop:
	mul	$t2, $t0, 4
	add	$t2, $t2, $t8
	lw	$t3, ($t2)
	bgt	$t3, $t1, increment
	j	decrement
increment:
	addi	$t1, $t1, 1
	j	skip
decrement:
	subi	$t1, $t1, 1
skip:
	addi	$t0, $t0, 1
	blt	$t0, $t4, logic_loop
	
print_loop_init:
	move	$t0, $zero
	lw	$t1, size
	la	$t8, array
print_loop:
	mul	$t2, $t0, 4
	li	$v0, 1
	lw	$a0, array($t2)
	syscall
	li	$v0, 4
	la	$a0, space
	syscall
	addi	$t0, $t0, 1
	blt	$t0, $t1, print_loop

exit:
	li	$v0, 10
	syscall