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do_stuff (i27 a0, i27 a1) { i27 r0 = a0 + a1; i27 r1 = a0 - a1; => (r0, r1); } /* this is a function of some kind */ main (i27 a0, i27 a1) { i27 r0 = a0 + a1; /* r0 is reassigned */ &do_stuff (r0, 29) => (r0, r1); r0 < r1 -> somewhere_else; => (r1); somewhere_else: => (r0); }