external printf

def print_two_int ()
local a1, a2:
  rax: a1 <- copy %rdi;
  rbx: a2 <- copy %rsi;
  l10: %rdi <- copy "%d %d\n";
  l11: %rsi <- copy a1;
  l12: %rdx <- copy a2;
  l13: %rax <- copy 0;
  l14: printf();
  l15: ret;
end

globals (x)
  l01: %rdi <- copy 37;
  l02: %rsi <- copy 73;
  l03: print_two_int();
  l04: exit;
end