Subversion Repositories openrisc

extern void abort (void);

typedef unsigned long HARD_REG_SET[2];

HARD_REG_SET reg_class_contents[2];

struct du_chain

{

  struct du_chain *next_use;

  int cl;

};

void __attribute__((noinline))

merge_overlapping_regs (HARD_REG_SET *p)

{

  if ((*p)[0] != -1 || (*p)[1] != -1)

    abort ();

}

void __attribute__((noinline))

regrename_optimize (struct du_chain *this)

{

  HARD_REG_SET this_unavailable;

  unsigned long *scan_fp_;

  int n_uses;

  struct du_chain *last;

  this_unavailable[0] = 0;

  this_unavailable[1] = 0;

  n_uses = 0;

  for (last = this; last->next_use; last = last->next_use)

    {

      scan_fp_ = reg_class_contents[last->cl];

      n_uses++;

      this_unavailable[0] |= ~ scan_fp_[0];

      this_unavailable[1] |= ~ scan_fp_[1];

    }

  if (n_uses < 1)

    return;

  scan_fp_ = reg_class_contents[last->cl];

  this_unavailable[0] |= ~ scan_fp_[0];

  this_unavailable[1] |= ~ scan_fp_[1];

  merge_overlapping_regs (&this_unavailable);

}

int main()

{

  struct du_chain du1 = { 0, 0 };

  struct du_chain du0 = { &du1, 1 };

  reg_class_contents[0][0] = -1;

  reg_class_contents[0][1] = -1;

  reg_class_contents[1][0] = 0;

  reg_class_contents[1][1] = 0;

  regrename_optimize (&du0);

  return 0;

}