Mips exercise 1

1.asm

jal printResult
j main

nextState:
	add $t7, $zero, $ra
	addi $t6, $zero, 0
	addi $t4, $zero, 31
nextStateLoop:
	jal countNeighbours
	jal checkBit
	beqz $t0, nextStateLoopDead
nextStateLoopAlive:
	jal aliveCell
	j nextStateNextIter
nextStateLoopDead:
	jal deadCell
nextStateNextIter:
	addi $t4, $t4, -1
	bltz $t4, nextStateReturn
	j nextStateLoop
nextStateReturn:
	addi $v0, $t6, 0
	jr $t7
	
countNeighbours:
	addi $t5, $zero, 0
	add $t3, $zero, $ra 
	
	addi $a1, $t4, -2
	blt $a1, $zero, NM1
	jal addBit
NM1:
	addi $a1, $t4, -1
	blt $a1, $zero, NP1
	jal addBit
NP1:
	addi $a1, $t4, 1
	addi $t1, $zero, 31
	bgt $a1, $t1, NP2
	jal addBit	
NP2:
	addi $a1, $t4, 2
	addi $t1, $zero, 31
	bgt $a1, $t1, returnCountNeighbours
	jal addBit	
returnCountNeighbours:
	jr $t3
	
addBit:
	addi $t2, $zero, 1
	sllv $t0, $t2, $a1
	and $t0, $a0, $t0
	slt $t0, $zero, $t0
	add $t5, $t5, $t0
	jr $ra
	
checkBit:
	addi $t1, $zero, 1
	sllv $t0, $t1, $a1
	and $t0, $a0, $t0
	slt $t0, $zero, $t0
	jr $ra
	
aliveCell:
	add $t3, $zero, $ra
	addi $t1, $zero, 2
	beq $t1, $t5, endAliveCell
	addi $t1, $zero, 4
	beq $t1, $t5, endAliveCell
	jal makeAlive
	j endAliveCell
endAliveCell:
	jr $t3

deadCell:
	add $t3, $zero, $ra
	addi $t1, $zero, 2
	beq $t1, $t5, deadCellAlive
	addi $t1, $zero, 3
	beq $t1, $t5 deadCellAlive
	j endDeadCell
deadCellAlive:
	jal makeAlive
endDeadCell:
	jr $t3

makeAlive:
	addi $t0, $zero, 1
	sllv $t0, $t0, $t4
	or $t6, $t0, $t6
	jr $ra
	
printResult:
	add $t7, $zero, $ra
	addi $t2, $zero, 31
printLoop:
	add $a1, $zero, $t2
	jal checkBit
	li $v0, 1
	add $a2, $zero, $a0
	add $a0, $zero, $t0
	syscall
	add $a0, $zero, $a2

	addi $t2, $t2, -1
	bltz $t2, printResultReturn
	j printLoop
printResultReturn:
	add $a2, $zero, $a0
	addi $v0, $zero, 4 
	la $a0, newLine
	syscall
	add $a0, $zero, $a2

	jr $t7
	
main:
	jal nextState
	add $a0, $zero, $v0
	jal printResult
	j main
	
.data
newLine: .asciiz "\n"
.text