a:
    st %r2 -> [sp]--      / Spill r3
    st %r3 -> [sp]--      / Spill r3

    ld [fp+12] -> %r0     / Load x into r0
    ld [r0] -> %r1        / Load x[0] into r1
    ld [fp+12] -> %r2     / Load x[2] into r2
    mov #8 -> %r3
    add %r2, %r3 -> %r2
    ld [r2] -> %r2 
    add %r1, %r2 -> %r2   / Add them and put the result into r2
    st %r2 -> [r0]        / Store r2 into x[0]

    ld [fp+12] -> %r0     / return x+1
    mov #4 -> %r1
    add %r0, %r1 -> %r0

    ld ++[sp] -> %r3      / Restore r3
    ld ++[sp] -> %r2      / Restore r2
    ret

main:
    push #16           // Array = fp-8, ip = fp-12
    mov #8 -> %r0
    st %r0 -> [fp-8]
    mov #9 -> %r0
    st %r0 -> [fp-4]
    mov #10 -> %r0
    st %r0 -> [fp]
 
    mov #-8 -> %r0
    add %r0, %fp -> %r0
    st %r0 -> [sp]--
    jsr a
    pop #4
    st %r0 -> [fp-12]

    ld [fp-12] -> %r0
    ld [r0] -> %r1
    add %g1, %r1 -> %r1
    st %r1 -> [r0]