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;; Predicate definitions for Vitesse IQ2000.

;; Copyright (C) 2005 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 2, 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 COPYING.  If not, write to

;; the Free Software Foundation, 51 Franklin Street, Fifth Floor,

;; Boston, MA 02110-1301, USA.

;; Return 1 if OP can be used as an operand where a register or 16 bit

;; unsigned integer is needed.

(define_predicate "uns_arith_operand"

  (match_code "reg,const_int,subreg")

{

  if (GET_CODE (op) == CONST_INT && SMALL_INT_UNSIGNED (op))

    return 1;

  return register_operand (op, mode);

})

;; Return 1 if OP can be used as an operand where a 16 bit integer is

;; needed.

(define_predicate "arith_operand"

  (match_code "reg,const_int,subreg")

{

  if (GET_CODE (op) == CONST_INT && SMALL_INT (op))

    return 1;

  return register_operand (op, mode);

})

;; Return 1 if OP is a integer which fits in 16 bits.

(define_predicate "small_int"

  (match_code "const_int")

{

  return (GET_CODE (op) == CONST_INT && SMALL_INT (op));

})

;; Return 1 if OP is a 32 bit integer which is too big to be loaded

;; with one instruction.

(define_predicate "large_int"

  (match_code "const_int")

{

  HOST_WIDE_INT value;

  if (GET_CODE (op) != CONST_INT)

    return 0;

  value = INTVAL (op);

  /* IOR reg,$r0,value.  */

  if ((value & ~ ((HOST_WIDE_INT) 0x0000ffff)) == 0)

    return 0;

  /* SUBU reg,$r0,value.  */

  if (((unsigned HOST_WIDE_INT) (value + 32768)) <= 32767)

    return 0;

  /* LUI reg,value >> 16.  */

  if ((value & 0x0000ffff) == 0)

    return 0;

  return 1;

})

;; Return 1 if OP is a register or the constant 0.

(define_predicate "reg_or_0_operand"

  (match_code "reg,const_int,const_double,subreg")

{

  switch (GET_CODE (op))

    {

    case CONST_INT:

      return INTVAL (op) == 0;

    case CONST_DOUBLE:

      return op == CONST0_RTX (mode);

    case REG:

    case SUBREG:

      return register_operand (op, mode);

    default:

      break;

    }

  return 0;

})

;; Return 1 if OP is a memory operand that fits in a single

;; instruction (i.e., register + small offset).

(define_predicate "simple_memory_operand"

  (match_code "mem,subreg")

{

  rtx addr, plus0, plus1;

  /* Eliminate non-memory operations.  */

  if (GET_CODE (op) != MEM)

    return 0;

  /* Dword operations really put out 2 instructions, so eliminate them.  */

  if (GET_MODE_SIZE (GET_MODE (op)) > (unsigned) UNITS_PER_WORD)

    return 0;

  /* Decode the address now.  */

  addr = XEXP (op, 0);

  switch (GET_CODE (addr))

    {

    case REG:

    case LO_SUM:

      return 1;

    case CONST_INT:

      return SMALL_INT (addr);

    case PLUS:

      plus0 = XEXP (addr, 0);

      plus1 = XEXP (addr, 1);

      if (GET_CODE (plus0) == REG

          && GET_CODE (plus1) == CONST_INT && SMALL_INT (plus1)

          && SMALL_INT_UNSIGNED (plus1) /* No negative offsets.  */)

        return 1;

      else if (GET_CODE (plus1) == REG

               && GET_CODE (plus0) == CONST_INT && SMALL_INT (plus0)

               && SMALL_INT_UNSIGNED (plus1) /* No negative offsets.  */)

        return 1;

      else

        return 0;

    case SYMBOL_REF:

      return 0;

    default:

      break;

    }

  return 0;

})

;; Return nonzero if the code of this rtx pattern is EQ or NE.

(define_predicate "equality_op"

  (match_code "eq,ne")

{

  if (mode != GET_MODE (op))

    return 0;

  return GET_CODE (op) == EQ || GET_CODE (op) == NE;

})

;; Return nonzero if the code is a relational operations (EQ, LE,

;; etc).

(define_predicate "cmp_op"

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

{

  if (mode != GET_MODE (op))

    return 0;

  return COMPARISON_P (op);

})

;; Return nonzero if the operand is either the PC or a label_ref.

(define_special_predicate "pc_or_label_operand"

  (match_code "pc,label_ref")

{

  if (op == pc_rtx)

    return 1;

  if (GET_CODE (op) == LABEL_REF)

    return 1;

  return 0;

})

;; Return nonzero if OP is a valid operand for a call instruction.

(define_predicate "call_insn_operand"

  (match_code "const_int,const,symbol_ref,reg")

{

  return (CONSTANT_ADDRESS_P (op)

          || (GET_CODE (op) == REG && op != arg_pointer_rtx

              && ! (REGNO (op) >= FIRST_PSEUDO_REGISTER

                    && REGNO (op) <= LAST_VIRTUAL_REGISTER)));

})

;; Return nonzero if OP is valid as a source operand for a move

;; instruction.

(define_predicate "move_operand"

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

{

  /* Accept any general operand after reload has started; doing so

     avoids losing if reload does an in-place replacement of a register

     with a SYMBOL_REF or CONST.  */

  return (general_operand (op, mode)

          && (! (iq2000_check_split (op, mode))

              || reload_in_progress || reload_completed));

})

;; Return nonzero if OP is a constant power of 2.

(define_predicate "power_of_2_operand"

  (match_code "const_int")

{

  int intval;

  if (GET_CODE (op) != CONST_INT)

    return 0;

  else

    intval = INTVAL (op);

  return ((intval & ((unsigned)(intval) - 1)) == 0);

})