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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;
+})