1extern void abort (void);
2
3typedef unsigned long HARD_REG_SET[2];
4HARD_REG_SET reg_class_contents[2];
5
6struct du_chain
7{
8  struct du_chain *next_use;
9  int cl;
10};
11
12void __attribute__((noinline))
13merge_overlapping_regs (HARD_REG_SET *p)
14{
15  if ((*p)[0] != -1 || (*p)[1] != -1)
16    abort ();
17}
18
19void __attribute__((noinline))
20regrename_optimize (struct du_chain *this)
21{
22  HARD_REG_SET this_unavailable;
23  unsigned long *scan_fp_;
24  int n_uses;
25  struct du_chain *last;
26
27  this_unavailable[0] = 0;
28  this_unavailable[1] = 0;
29
30  n_uses = 0;
31  for (last = this; last->next_use; last = last->next_use)
32    {
33      scan_fp_ = reg_class_contents[last->cl];
34      n_uses++;
35      this_unavailable[0] |= ~ scan_fp_[0];
36      this_unavailable[1] |= ~ scan_fp_[1];
37    }
38  if (n_uses < 1)
39    return;
40
41  scan_fp_ = reg_class_contents[last->cl];
42  this_unavailable[0] |= ~ scan_fp_[0];
43  this_unavailable[1] |= ~ scan_fp_[1];
44
45  merge_overlapping_regs (&this_unavailable);
46}
47
48int main()
49{
50  struct du_chain du1 = { 0, 0 };
51  struct du_chain du0 = { &du1, 1 };
52  reg_class_contents[0][0] = -1;
53  reg_class_contents[0][1] = -1;
54  reg_class_contents[1][0] = 0;
55  reg_class_contents[1][1] = 0;
56  regrename_optimize (&du0);
57  return 0;
58}
59