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researchv10 Dan Cross

 0 for the whole things.  */

  fmt = GET_RTX_FORMAT (code);
  for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
    {
      register int j;
      switch (fmt[i])
	{
	case 'i':
	  if (XINT (x, i) != XINT (y, i))
	    return 0;
	  break;

	case 's':
	  if (strcmp (XSTR (x, i), XSTR (y, i)))
	    return 0;
	  break;

	case 'e':
	  if (! rtx_renumbered_equal_p (XEXP (x, i), XEXP (y, i)))
	    return 0;
	  break;

	case '0':
	  break;

	case 'E':
	  if (XVECLEN (x, i) != XVECLEN (y, i))
	    return 0;
	  for (j = XVECLEN (x, i) - 1; j >= 0; j--)
	    if (!rtx_renumbered_equal_p (XVECEXP (x, i, j), XVECEXP (y, i, j)))
	      return 0;
	  break;

	  /* It is believed that rtx's at this level will never
	     contain anything but integers and other rtx's,
	     except for within LABEL_REFs and SYMBOL_REFs.  */
	default:
	  abort ();
	}
    }
  return 1;
}

/* If X is a hard register or equivalent to one or a subregister of one,
   return the hard register number.  Otherwise, return -1.
   Any rtx is valid for X.  */

int
true_regnum (x)
     rtx x;
{
  if (GET_CODE (x) == REG)
    {
      if (REGNO (x) >= FIRST_PSEUDO_REGISTER)
	return reg_renumber[R

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