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_v: .word 29,28,27,26,25,24,23,22,21,-1
_n: .word 10
.text
.globl main
main:
la $a0, _v
lw $a1, _n
jal sort
li $v0, 10 #Exit syscall
syscall
# procedure bubble-sort
sort:
# salvamento do contexto
addi $sp, $sp, -20
sw $ra, 8($sp)
sw $s1, 4($sp)
sw $s0, 0($sp)
sw $s2, 12($sp)
sw $s3, 16($fp)
move $s2, $a0 # s2 = V[]
move $s3, $a1 # s3 = n
move $s0, $zero # i = 0
# primeiro loop
for1tst:
nop #MARCA 1
slt $t0, $s0, $s3 # i < n
beq $t0, $zero, exit1
addi $s1, $s0, -1 # j = i-1
# segundo looṕ
for2tst:
slti $t0, $s1, 0 # j < 0
bne $t0, $zero, exit2
sll $t1, $s1, 2 # j * 4
add $t2, $s2, $t1 # j + V[]
lw $t3, 0($t2) # V[j]
lw $t4, 4($t2) # V[j+1]
slt $t0, $t4, $t3 # V[j+1] < V[j]
beq $t0, $zero, exit2
move $a1, $s1 # a1 = j
move $a0, $s2
nop # MARCA 2
jal swap # swap
addi $s1, $s1, -1 # j--
j for2tst
# vai embora
exit2:
addi $s0, $s0, 1 # i++
j for1tst # volta pro loop do i
exit1:
# restauração de contexto
lw $s0, 0($sp)
lw $s1, 4($sp)
lw $ra, 8($sp)
lw $s2, 12($sp)
lw $s3, 16($sp)
addi $sp, $sp, 20
# returns
jr $ra
# swap
swap:
# calculo de indices
sll $t0, $a1, 2 # k * 4
add $a0, $t0, $a0 # k + V[]
# realiza a troca
lw $t1, 0($a0)
lw $t2, 4($a0)
sw $t2, 0($a0)
sw $t1, 4($a0)
# retorno ao programa principal
jr $ra
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