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;; Operand and operator predicates for the GCC MMIX port.

;; Copyright (C) 2005, 2007 Free Software Foundation, Inc.

;; This file is part of GCC.

;;

;; GCC is free software; you can redistribute it and/or modify

;; it under the terms of the GNU General Public License as published by

;; the Free Software Foundation; either version 3, or (at your option)

;; any later version.

;;

;; GCC is distributed in the hope that it will be useful,

;; but WITHOUT ANY WARRANTY; without even the implied warranty of

;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

;; GNU General Public License for more details.

;;

;; You should have received a copy of the GNU General Public License

;; along with GCC; see the file COPYING3.  If not see

;; .

;; Return 1 if OP is a valid comparison operator for "cbranch" instructions.

;; LE and GE are further lowered by the cbranchdf4 pattern.

(define_predicate "float_comparison_operator"

  (match_code "ne, eq, le, ge, lt, gt, ordered, unordered"))

;; True if this is a foldable comparison operator

;; - one where a the result of (compare:CC (reg) (const_int 0)) can be

;; replaced by (reg).  */

(define_predicate "mmix_foldable_comparison_operator"

  (match_code "ne, eq, ge, gt, le, lt, gtu, leu")

{

  RTX_CODE code = GET_CODE (op);

  if (mode == VOIDmode)

    mode = GET_MODE (op);

  /* This little bit is why the body of this predicate is kept as C.  */

  if (mode == VOIDmode)

    mode = GET_MODE (XEXP (op, 0));

  return ((mode == CCmode || mode == DImode)

          && (code == NE || code == EQ || code == GE || code == GT

              || code == LE || code == LT))

    /* FIXME: This may be a stupid trick.  What happens when GCC wants to

       reverse the condition?  Can it do that by itself?  Maybe it can

       even reverse the condition to fit a foldable one in the first

       place?  */

    || (mode == CC_UNSmode && (code == GTU || code == LEU));

})

;; Like comparison_operator, but only true if this comparison operator is

;; applied to a valid mode.  Needed to avoid jump.c generating invalid

;; code with -ffast-math (gcc.dg/20001228-1.c).

(define_predicate "mmix_comparison_operator"

  (match_operand 0 "comparison_operator")

{

  RTX_CODE code = GET_CODE (op);

  /* Comparison operators usually don't have a mode, but let's try and get

     one anyway for the day that changes.  */

  if (mode == VOIDmode)

    mode = GET_MODE (op);

  /* Get the mode from the first operand if we don't have one.

     Also the reason why we do this in C.  */

  if (mode == VOIDmode)

    mode = GET_MODE (XEXP (op, 0));

  /* FIXME: This needs to be kept in sync with the tables in

     mmix_output_condition.  */

  return

    mode == VOIDmode

    || (mode == CC_FUNmode

        && (code == ORDERED || code == UNORDERED))

    || (mode == CC_FPmode

        && (code == GT || code == LT))

    || (mode == CC_FPEQmode

        && (code == NE || code == EQ))

    || (mode == CC_UNSmode

        && (code == GEU || code == GTU || code == LEU || code == LTU))

    || (mode == CCmode

        && (code == NE || code == EQ || code == GE || code == GT

            || code == LE || code == LT))

    || (mode == DImode

        && (code == NE || code == EQ || code == GE || code == GT

            || code == LE || code == LT || code == LEU || code == GTU));

})

;; True if this is a register with a condition-code mode.

(define_predicate "mmix_reg_cc_operand"

  (and (match_operand 0 "register_operand")

       (ior (match_test "GET_MODE (op) == CCmode")

            (ior (match_test "GET_MODE (op) == CC_UNSmode")

                 (ior (match_test "GET_MODE (op) == CC_FPmode")

                      (ior (match_test "GET_MODE (op) == CC_FPEQmode")

                           (match_test "GET_MODE (op) == CC_FUNmode")))))))

;; True if this is an address_operand or a symbolic operand.

(define_predicate "mmix_symbolic_or_address_operand"

  (match_code "symbol_ref, label_ref, const, subreg, reg, plus")

{

  switch (GET_CODE (op))

    {

    case SYMBOL_REF:

    case LABEL_REF:

      return 1;

    case CONST:

      /* The reason why this body still is C.  */

      op = XEXP (op, 0);

      if ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF

           || GET_CODE (XEXP (op, 0)) == LABEL_REF)

          && (GET_CODE (XEXP (op, 1)) == CONST_INT

              || (GET_CODE (XEXP (op, 1)) == CONST_DOUBLE

                  && GET_MODE (XEXP (op, 1)) == VOIDmode)))

        return 1;

      /* Fall through.  */

    default:

      return address_operand (op, mode);

    }

})

;; True if this is a register or CONST_INT (or CONST_DOUBLE for DImode).

;; We could narrow the value down with a couple of predicates, but that

;; doesn't seem to be worth it at the moment.

(define_predicate "mmix_reg_or_constant_operand"

  (ior (match_operand 0 "register_operand")

       (ior (match_code "const_int")

            (and (match_code "const_double")

                 (match_test "GET_MODE (op) == VOIDmode")))))

;; True if this is a register or 0 (int or float).

(define_predicate "mmix_reg_or_0_operand"

  (ior

   (match_operand 0 "register_operand")

   (ior

    (and (match_code "const_int")

         (match_test "op == const0_rtx"))

    (and

     (match_code "const_double")

     ;; FIXME: Is mode calculation necessary and correct?

     (match_test

      "op == CONST0_RTX (mode == VOIDmode ? GET_MODE (op) : mode)")))))

;; True if this is a register or an int 0..255.

(define_predicate "mmix_reg_or_8bit_operand"

  (ior

   (match_operand 0 "register_operand")

   (and (match_code "const_int")

        (match_test "CONST_OK_FOR_LETTER_P (INTVAL (op), 'I')"))))