remainder

main:
    addi x4, x0, 255

    addi sp, sp, 1600
    addi sp, sp, -8
    sd   x4, 0(sp)
    jal  x1, make_even
    addi x4, x4, -4
    ld   x4, 0(sp)
    addi sp, sp, 8
    ld   x4, 0(sp)
    # ecall x4, x4, 0
    ORG 96


make_even:
    addi x5, x0, 2
    rem  x6, x4, x5
    beq  x6, x0, else
    addi x4, x4, -1
    sd   x4, 0(sp)
    jalr x0, 0(x1)
    # ORG 96

else:
    jalr x0, 0(x1)