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# print(hex(0b10101))
.text
main:
li $t0, 21 # t0 = 0b10101
li $t1, 0 # t1 = 0
li $t9, 9 # t9 = 9
reverse:
beqz $t0, done # if (!t0) goto done
andi $t2, $t0, 0xf # t2 = t0 & 0xf
sra $t0, $t0, 4 # t0 >>= 4
sll $t1, $t1, 4 # t1 <<= 4
add $t1, $t1, $t2 # t1 += t2
j reverse # goto reverse
done:
li $v0, 11 # print character
li $a0, 48 # 0
syscall
li $v0, 11 # print character
li $a0, 120 # x
syscall
bnez $t1, print # if (!t1) goto print
li $v0, 11 # print character
li $a0, 48 # 0
syscall
j end # goto end
print:
beqz $t1, end # if (!t1) goto end
andi $t2, $t1, 0xf # t2 = t1 & 0xf
sra $t1, $t1, 4 # t1 >>= 4
addi $a0, $t2, 48 # a0 = chr(t2), sort of
ble $t2, $t9, put # if (t2 <= 9) goto put
addi $a0, $a0, 7 # a0 += 7
put:
li $v0, 11 # print character at a0
syscall
j print # goto print
end:
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall
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