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unlockable
2024-05-03 23:57:11 +08:00
parent 182a6eb8ae
commit 19d88bfaa9
5 changed files with 136 additions and 133 deletions
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54
1/homework/exp1/exp1_4.asm
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@@ -2,34 +2,34 @@
.text
main:
li $v0, 5 # read in
syscall
move $s0, $v0 # s0 is the n
move $a0, $s0 # set the first call arg as n
jal hanoi # call proc
move $a0, $v0 # print out
li $v0, 1
syscall
li $v0, 17
syscall
li $v0, 5 # read in
syscall
move $s0, $v0 # s0 is the n
move $a0, $s0 # set the first call arg as n
jal hanoi # call proc
move $a0, $v0 # print out
li $v0, 1
syscall
li $v0, 17
syscall
hanoi:
li $t0, 1
ble $a0, $t0, hanoi_bottom # if n <= 1, return
j hanoi_recur
li $t0, 1
ble $a0, $t0, hanoi_bottom # if n <= 1, return
j hanoi_recur
hanoi_bottom:
li $v0, 1 # return 1
jr $ra
li $v0, 1 # return 1
jr $ra
hanoi_recur:
subi $sp, $sp, 8 # move sp down by 2 word
sw $s0, 4($sp) # first word is the n in caller
sw $ra, 0($sp) # second word is the return addr of this callee
move $s0, $a0
subi $a0, $s0, 1
jal hanoi
sll $v0, $v0, 1 # hanoi(n - 1) * 2
ori $v0, $v0, 1 # hanoi(n - 1) * 2 + 1
lw $s0, 4($sp) # reverse s0
lw $ra, 0($sp) # reverse ra
addi $sp, $sp, 8
jr $ra
subi $sp, $sp, 8 # move sp down by 2 word
sw $s0, 4($sp) # first word is the n in caller
sw $ra, 0($sp) # second word is the return addr of this callee
move $s0, $a0
subi $a0, $s0, 1
jal hanoi
sll $v0, $v0, 1 # hanoi(n - 1) * 2
ori $v0, $v0, 1 # hanoi(n - 1) * 2 + 1
lw $s0, 4($sp) # reverse s0
lw $ra, 0($sp) # reverse ra
addi $sp, $sp, 8
jr $ra