code checking

.data
cod: .word 0x05 # store input in memory

.text
la x10, cod # load address
lw x2, 0(x10) # load data from address
li x7, 5 # loop counter
li x4, 1 # to go through bits one by one
li x8, 2 # desired result
li x1, 0 # counts number of high bits
andi x3, x2, 0xffffffe0 # mask lower 5 bits
bne x3, x0, notacode # if any other bit is high, return 0
back:
    and x5, x2, x4 # mask
    beq x5, x0, next # check if high
    addi x1, x1, 1 # increment 1 if high
next:
    slli x4, x4, 1 # shift mask to next position
    addi x7, x7, -1 # update loop counter
    bne x7, x0, back
    bne x1, x8, notacode # check desired result
    addi x11, x0, 0xff # if satisfied store FF
store:
    sb x11, 4(x10) # storing happens here
    j exit
notacode:
    add x11, x0, x0 # else store 0
    beq x0, x0, store
exit:
    nop # end of program