gcc/testsuite/gcc.c-torture/execute/20080519-1.c

   1 extern void abort (void);
   2
   3 typedef unsigned long HARD_REG_SET[2];
   4 HARD_REG_SET reg_class_contents[2];
   5
   6 struct du_chain
   7 {
   8   struct du_chain *next_use;
   9   int cl;
  10 };
  11
  12 void __attribute__((noinline))
  13 merge_overlapping_regs (HARD_REG_SET *p)
  14 {
  15   if ((*p)[0] != -1 || (*p)[1] != -1)
  16     abort ();
  17 }
  18
  19 void __attribute__((noinline))
  20 regrename_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
  48 int 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 }