start:  in      ""          => r_x
        loadI   0           => r_i
        loadI   @alength    => r_len
for:    cmp_LT  r_i,r_len   => r_cmp
        cbr     r_cmp       -> body,end
body:   i2i     r_i         => r_a      // compute address of a[i]
        multI   r_a,4       => r_a      // multiply by size of int
        addI    r_a,@a      => r_a      // add a's base offset
        loadAO  r_arp,r_a   => r_ai     // r_ai <- a[i]
        cmp_EQ  r_ai,r_x    => r_cmp
        cbr     r_cmp       -> end,jump
jump:   addI    r_i,1       => r_i
        jumpI               -> for
end:    out "Index: ",r_i