bootstrap failure on darwin6.1

[David Edelsohn]

	How about the following?  It's more accurate, but we need to make
sure that it does not cause GCC to make any stupid decisions.

David


/* A C expression returning the cost of moving data from a register of class
   CLASS1 to one of CLASS2.  */

int
rs6000_register_move_cost (mode, from, to)
     enum machine_mode mode;
     enum reg_class from, to;
{
  /*  Moves from/to GENERAL_REGS.  */
  if (reg_classes_intersect_p (to, GENERAL_REGS)
      || reg_classes_intersect_p (from, GENERAL_REGS))
    {
      if (! reg_classes_intersect_p (to, GENERAL_REGS))
	from = to;

      if (from == FLOAT_REGS || from == ALTIVEC_REGS)
	return (MEMORY_MOVE_COST (mode, from, 0)
		+ MEMORY_MOVE_COST (mode, GENERAL_REGS, 0));

/* It's more expensive to move CR_REGS than CR0_REGS because of the shift...*/
      else if (from == CR_REGS)
	return 4;

      else
/* A move will cost one instruction per GPR moved.  */
	return 2 * HARD_REGNO_NREGS (0, mode);
    }

/* Moving between two similar registers is just one instruction.  */
  else if (reg_classes_intersect_p (to, from))
    return mode == TFmode ? 4 : 2;

/* Everything else has to go through GENERAL_REGS.  */
  else
    return (rs6000_register_move_cost (mode, GENERAL_REGS, to) 
	    + rs6000_register_move_cost (mode, from, GENERAL_REGS));
}

/* A C expressions returning the cost of moving data of MODE from a register to
   or from memory.  */

int
rs6000_memory_move_cost (mode, class, in)
  enum machine_mode mode;
  enum reg_class class;
  int in ATTRIBUTE_UNUSED;
{
  if (reg_classes_intersect_p (class, GENERAL_REGS))
    return 4 * HARD_REGNO_NREGS (0, mode);
  else if (reg_classes_intersect_p (class, FLOAT_REGS))
    return 4 * HARD_REGNO_NREGS (32, mode);
  else if (reg_classes_intersect_p (class, ALTIVEC_REGS))
    return 4 * HARD_REGNO_NREGS (FIRST_ALTIVEC_REGNO, mode);
  else
    return 4 + rs6000_register_move_cost (mode, class, GENERAL_REGS);
}