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;; Predicate definitions for Motorola 68000.

;; 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.

;; Special case of a general operand that's used as a source

;; operand. Use this to permit reads from PC-relative memory when

;; -mpcrel is specified.

(define_predicate "general_src_operand"

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

{

  if (TARGET_PCREL

      && GET_CODE (op) == MEM

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

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

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

    return 1;

  return general_operand (op, mode);

})

;; Special case of a nonimmediate operand that's used as a source. Use

;; this to permit reads from PC-relative memory when -mpcrel is

;; specified.

(define_predicate "nonimmediate_src_operand"

  (match_code "subreg,reg,mem")

{

  if (TARGET_PCREL && GET_CODE (op) == MEM

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

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

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

    return 1;

  return nonimmediate_operand (op, mode);

})

;; Special case of a memory operand that's used as a source. Use this

;; to permit reads from PC-relative memory when -mpcrel is specified.

(define_predicate "memory_src_operand"

  (match_code "subreg,mem")

{

  if (TARGET_PCREL && GET_CODE (op) == MEM

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

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

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

    return 1;

  return memory_operand (op, mode);

})

;; Similar to general_operand, but exclude stack_pointer_rtx.

(define_predicate "not_sp_operand"

  (match_code "subreg,reg,mem")

{

  return op != stack_pointer_rtx && nonimmediate_operand (op, mode);

})

;; Predicate that accepts only a pc-relative address.  This is needed

;; because pc-relative addresses don't satisfy the predicate

;; "general_src_operand".

(define_predicate "pcrel_address"

  (match_code "symbol_ref,label_ref,const")

{

  return (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == LABEL_REF

          || GET_CODE (op) == CONST);

})

;; Accept integer operands in the range 0..0xffffffff.  We have to

;; check the range carefully since this predicate is used in DImode

;; contexts.  Also, we need some extra crud to make it work when

;; hosted on 64-bit machines.

(define_predicate "const_uint32_operand"

  (match_code "const_int,const_double")

{

  /* It doesn't make sense to ask this question with a mode that is

     not larger than 32 bits.  */

  if (GET_MODE_BITSIZE (mode) <= 32)

    abort ();

#if HOST_BITS_PER_WIDE_INT > 32

  /* All allowed constants will fit a CONST_INT.  */

  return (GET_CODE (op) == CONST_INT

          && (INTVAL (op) >= 0 && INTVAL (op) <= 0xffffffffL));

#else

  return (GET_CODE (op) == CONST_INT

          || (GET_CODE (op) == CONST_DOUBLE && CONST_DOUBLE_HIGH (op) == 0));

#endif

})

;; Accept integer operands in the range -0x80000000..0x7fffffff.  We

;; have to check the range carefully since this predicate is used in

;; DImode contexts.

(define_predicate "const_sint32_operand"

  (match_code "const_int")

{

  /* It doesn't make sense to ask this question with a mode that is

     not larger than 32 bits.  */

  if (GET_MODE_BITSIZE (mode) <= 32)

    abort ();

  /* All allowed constants will fit a CONST_INT.  */

  return (GET_CODE (op) == CONST_INT

          && (INTVAL (op) >= (-0x7fffffff - 1) && INTVAL (op) <= 0x7fffffff));

})

;; Return true if X is a valid comparison operator for the dbcc

;; instruction.  Note it rejects floating point comparison

;; operators. (In the future we could use Fdbcc).  It also rejects

;; some comparisons when CC_NO_OVERFLOW is set.

(define_predicate "valid_dbcc_comparison_p"

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

{

  return valid_dbcc_comparison_p_2 (op, mode);

})

;; Check for sign_extend or zero_extend.  Used for bit-count operands.

(define_predicate "extend_operator"

  (match_code "sign_extend,zero_extend")

{

  if (mode != VOIDmode && GET_MODE (op) != mode)

    return 0;

  switch (GET_CODE (op))

    {

    case SIGN_EXTEND:

    case ZERO_EXTEND:

      return 1;

    default:

      return 0;

    }

})

;; Returns true if OP is either a symbol reference or a sum of a

;; symbol reference and a constant.

(define_predicate "symbolic_operand"

  (match_code "symbol_ref,label_ref,const")

{

  switch (GET_CODE (op))

    {

    case SYMBOL_REF:

    case LABEL_REF:

      return true;

    case CONST:

      op = XEXP (op, 0);

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

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

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

#if 0 /* Deleted, with corresponding change in m68k.h,

         so as to fit the specs.  No CONST_DOUBLE is ever symbolic.  */

    case CONST_DOUBLE:

      return GET_MODE (op) == mode;

#endif

    default:

      return false;

    }

})

;; TODO: Add a comment here.

(define_predicate "post_inc_operand"

  (match_code "mem")

{

  return MEM_P (op) && GET_CODE (XEXP (op, 0)) == POST_INC;

})

;; TODO: Add a comment here.

(define_predicate "pre_dec_operand"

  (match_code "mem")

{

  return MEM_P (op) && GET_CODE (XEXP (op, 0)) == PRE_DEC;

})