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;; Predicate definitions for Renesas RX.

;; Copyright (C) 2008, 2009 Free Software Foundation, Inc.

;; Contributed by Red Hat.

;;

;; 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

;; .

;; Check that the operand is suitable for a call insn.

;; Only registers and symbol refs are allowed.

(define_predicate "rx_call_operand"

  (match_code "symbol_ref,reg")

)

;; For sibcall operations we can only use a symbolic address.

(define_predicate "rx_symbolic_call_operand"

  (match_code "symbol_ref")

)

;; Check that the operand is suitable for a shift insn

;; Only small integers or a value in a register are permitted.

(define_predicate "rx_shift_operand"

  (match_code "const_int,reg")

  {

    if (CONST_INT_P (op))

      return IN_RANGE (INTVAL (op), 0, 31);

    return true;

  }

)

;; Check that the operand is suitable as the source operand

;; for a logic or arithmeitc instruction.  Registers, integers

;; and a restricted subset of memory addresses are allowed.

(define_predicate "rx_source_operand"

  (match_code "const_int,const_double,const,symbol_ref,label_ref,reg,mem")

  {

    if (CONSTANT_P (op))

      return rx_is_legitimate_constant (op);

    if (! MEM_P (op))

      return true;

    /* Do not allow size conversions whilst accessing memory.  */

    if (GET_MODE (op) != mode)

      return false;

    return rx_is_restricted_memory_address (XEXP (op, 0), mode);

  }

)

;; Check that the operand is suitable as the source operand

;; for a comparison instruction.  This is the same as

;; rx_source_operand except that SUBREGs are allowed but

;; CONST_INTs are not.

(define_predicate "rx_compare_operand"

  (match_code "subreg,reg,mem")

  {

    if (GET_CODE (op) == SUBREG)

      return REG_P (XEXP (op, 0));

    if (! MEM_P (op))

      return true;

    return rx_is_restricted_memory_address (XEXP (op, 0), mode);

  }

)

;; Return true if OP is a store multiple operation.  This looks like:

;;

;;   [(set (SP) (MINUS (SP) (INT)))

;;    (set (MEM (SP)) (REG))

;;    (set (MEM (MINUS (SP) (INT))) (REG)) {optionally repeated}

;;   ]

(define_special_predicate "rx_store_multiple_vector"

  (match_code "parallel")

{

  int count = XVECLEN (op, 0);

  unsigned int src_regno;

  rtx element;

  int i;

  /* Perform a quick check so we don't blow up below.  */

  if (count <= 2)

    return false;

  /* Check that the first element of the vector is the stack adjust.  */

  element = XVECEXP (op, 0, 0);

  if (   ! SET_P (element)

      || ! REG_P (SET_DEST (element))

      ||   REGNO (SET_DEST (element)) != SP_REG

      ||   GET_CODE (SET_SRC (element)) != MINUS

      || ! REG_P (XEXP (SET_SRC (element), 0))

      ||   REGNO (XEXP (SET_SRC (element), 0)) != SP_REG

      || ! CONST_INT_P (XEXP (SET_SRC (element), 1)))

    return false;

  /* Check that the next element is the first push.  */

  element = XVECEXP (op, 0, 1);

  if (   ! SET_P (element)

      || ! REG_P (SET_SRC (element))

      || GET_MODE (SET_SRC (element)) != SImode

      || ! MEM_P (SET_DEST (element))

      || GET_MODE (SET_DEST (element)) != SImode

      || GET_CODE (XEXP (SET_DEST (element), 0)) != MINUS

      || ! REG_P (XEXP (XEXP (SET_DEST (element), 0), 0))

      ||   REGNO (XEXP (XEXP (SET_DEST (element), 0), 0)) != SP_REG

      || ! CONST_INT_P (XEXP (XEXP (SET_DEST (element), 0), 1))

      || INTVAL (XEXP (XEXP (SET_DEST (element), 0), 1))

        != GET_MODE_SIZE (SImode))

    return false;

  src_regno = REGNO (SET_SRC (element));

  /* Check that the remaining elements use SP-

     addressing and decreasing register numbers.  */

  for (i = 2; i < count; i++)

    {

      element = XVECEXP (op, 0, i);

      if (   ! SET_P (element)

          || ! REG_P (SET_SRC (element))

          || GET_MODE (SET_SRC (element)) != SImode

          || REGNO (SET_SRC (element)) != src_regno - (i - 1)

          || ! MEM_P (SET_DEST (element))

          || GET_MODE (SET_DEST (element)) != SImode

          || GET_CODE (XEXP (SET_DEST (element), 0)) != MINUS

          || ! REG_P (XEXP (XEXP (SET_DEST (element), 0), 0))

          ||   REGNO (XEXP (XEXP (SET_DEST (element), 0), 0)) != SP_REG

          || ! CONST_INT_P (XEXP (XEXP (SET_DEST (element), 0), 1))

          || INTVAL (XEXP (XEXP (SET_DEST (element), 0), 1))

             != i * GET_MODE_SIZE (SImode))

        return false;

    }

  return true;

})

;; Return true if OP is a load multiple operation.

;; This looks like:

;;  [(set (SP) (PLUS (SP) (INT)))

;;   (set (REG) (MEM (SP)))

;;   (set (REG) (MEM (PLUS (SP) (INT)))) {optionally repeated}

;;  ]

(define_special_predicate "rx_load_multiple_vector"

  (match_code "parallel")

{

  int count = XVECLEN (op, 0);

  unsigned int dest_regno;

  rtx element;

  int i;

  /* Perform a quick check so we don't blow up below.  */

  if (count <= 2)

    return false;

  /* Check that the first element of the vector is the stack adjust.  */

  element = XVECEXP (op, 0, 0);

  if (   ! SET_P (element)

      || ! REG_P (SET_DEST (element))

      ||   REGNO (SET_DEST (element)) != SP_REG

      ||   GET_CODE (SET_SRC (element)) != PLUS

      || ! REG_P (XEXP (SET_SRC (element), 0))

      ||   REGNO (XEXP (SET_SRC (element), 0)) != SP_REG

      || ! CONST_INT_P (XEXP (SET_SRC (element), 1)))

    return false;

  /* Check that the next element is the first push.  */

  element = XVECEXP (op, 0, 1);

  if (   ! SET_P (element)

      || ! REG_P (SET_DEST (element))

      || ! MEM_P (SET_SRC (element))

      || ! REG_P (XEXP (SET_SRC (element), 0))

      ||   REGNO (XEXP (SET_SRC (element), 0)) != SP_REG)

    return false;

  dest_regno = REGNO (SET_DEST (element));

  /* Check that the remaining elements use SP+

     addressing and incremental register numbers.  */

  for (i = 2; i < count; i++)

    {

      element = XVECEXP (op, 0, i);

      if (   ! SET_P (element)

          || ! REG_P (SET_DEST (element))

          || GET_MODE (SET_DEST (element)) != SImode

          || REGNO (SET_DEST (element)) != dest_regno + (i - 1)

          || ! MEM_P (SET_SRC (element))

          || GET_MODE (SET_SRC (element)) != SImode

          || GET_CODE (XEXP (SET_SRC (element), 0)) != PLUS

          || ! REG_P (XEXP (XEXP (SET_SRC (element), 0), 0))

          ||   REGNO (XEXP (XEXP (SET_SRC (element), 0), 0)) != SP_REG

          || ! CONST_INT_P (XEXP (XEXP (SET_SRC (element), 0), 1))

          || INTVAL (XEXP (XEXP (SET_SRC (element), 0), 1))

             != (i - 1) * GET_MODE_SIZE (SImode))

        return false;

    }

  return true;

})

;; Return true if OP is a pop-and-return load multiple operation.

;; This looks like:

;;  [(set (SP) (PLUS (SP) (INT)))

;;   (set (REG) (MEM (SP)))

;;   (set (REG) (MEM (PLUS (SP) (INT)))) {optional and possibly repeated}

;;   (return)

;;  ]

(define_special_predicate "rx_rtsd_vector"

  (match_code "parallel")

{

  int count = XVECLEN (op, 0);

  unsigned int dest_regno;

  rtx element;

  int i;

  /* Perform a quick check so we don't blow up below.  */

  if (count <= 2)

    return false;

  /* Check that the first element of the vector is the stack adjust.  */

  element = XVECEXP (op, 0, 0);

  if (   ! SET_P (element)

      || ! REG_P (SET_DEST (element))

      ||   REGNO (SET_DEST (element)) != SP_REG

      ||   GET_CODE (SET_SRC (element)) != PLUS

      || ! REG_P (XEXP (SET_SRC (element), 0))

      ||   REGNO (XEXP (SET_SRC (element), 0)) != SP_REG

      || ! CONST_INT_P (XEXP (SET_SRC (element), 1)))

    return false;

  /* Check that the next element is the first push.  */

  element = XVECEXP (op, 0, 1);

  if (   ! SET_P (element)

      || ! REG_P (SET_DEST (element))

      || ! MEM_P (SET_SRC (element))

      || ! REG_P (XEXP (SET_SRC (element), 0))

      ||   REGNO (XEXP (SET_SRC (element), 0)) != SP_REG)

    return false;

  dest_regno = REGNO (SET_DEST (element));

  /* Check that the remaining elements, if any, and except

     for the last one, use SP+ addressing and incremental

     register numbers.  */

  for (i = 2; i < count - 1; i++)

    {

      element = XVECEXP (op, 0, i);

      if (   ! SET_P (element)

          || ! REG_P (SET_DEST (element))

          || GET_MODE (SET_DEST (element)) != SImode

          || REGNO (SET_DEST (element)) != dest_regno + (i - 1)

          || ! MEM_P (SET_SRC (element))

          || GET_MODE (SET_SRC (element)) != SImode

          || GET_CODE (XEXP (SET_SRC (element), 0)) != PLUS

          || ! REG_P (XEXP (XEXP (SET_SRC (element), 0), 0))

          ||   REGNO (XEXP (XEXP (SET_SRC (element), 0), 0)) != SP_REG

          || ! CONST_INT_P (XEXP (XEXP (SET_SRC (element), 0), 1))

          || INTVAL (XEXP (XEXP (SET_SRC (element), 0), 1))

             != (i - 1) * GET_MODE_SIZE (SImode))

        return false;

    }

  /* The last element must be a RETURN.  */

  element = XVECEXP (op, 0, count - 1);

  return GET_CODE (element) == RETURN;

})