;; Predicate definitions for Xilinx MicroBlaze
;; Copyright (C) 2009-2013 Free Software Foundation, Inc.
;;
;; Contributed by Michael Eager <eager@eagercon.com>.
;;
;; 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
;; <http://www.gnu.org/licenses/>.  


;; Return whether OP can be used as an operands in arithmetic.
(define_predicate "arith_operand"
  (ior (match_code "const_int,const_double")
       (match_operand 0 "register_operand")))

(define_predicate "arith_operand32"
  (ior (match_operand 0 "register_operand")
       (and (match_code "const_int,const_double")
	    (match_test "LARGE_INT (op)"))))

(define_predicate "arith_plus_operand"
 (match_operand 0 "general_operand")
{
  switch (GET_CODE (op))
    {
      default:
        return 0;
      case CONST_INT:
      case REG:
        return 1;
      case SYMBOL_REF:
      case LABEL_REF:
        if (flag_pic || microblaze_tls_referenced_p(op))
          return 0;
        return 1;
      case CONST:
        {
          rtx const0;
          const0 = XEXP (op, 0);

          switch (GET_CODE(const0))
            {
              default:
                return 0;
              case UNSPEC :
                return 1;

              case PLUS :
                {
                  rtx p0, p1;
                  p0 = XEXP (const0, 0);
                  p1 = XEXP (const0, 1);

                  if ((GET_CODE(p0) == SYMBOL_REF
                       || GET_CODE (p0) == LABEL_REF)
                      && GET_CODE(p1) == CONST_INT)
                    {
                      return arith_plus_operand (p0, GET_MODE(p0));
                    }
                }
            }
        }
    }
  return 0;
})

(define_predicate "const_0_operand"
  (and (match_code "const_int,const_double")
       (match_test "op == CONST0_RTX (GET_MODE (op))")))

;; Return whether OP is a register or the constant 0.
(define_predicate "reg_or_0_operand"
  (ior (match_operand 0 "const_0_operand")
       (match_operand 0 "register_operand")))

;;  Return if the operand is either the PC or a label_ref.  
(define_special_predicate "pc_or_label_operand"
  (ior (match_code "pc,label_ref")
       (and (match_code "symbol_ref")
            (match_test "!(strcmp ((XSTR (op, 0)), \"_stack_overflow_exit\"))"))))

;; Test for valid call operand
(define_predicate "call_insn_operand"
  (match_test "CALL_INSN_OP (op)"))

(define_predicate "call_insn_simple_operand"
  (and (match_test "CALL_INSN_OP (op)")
       (match_test "GET_CODE (op) == REG || GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == CONST_INT")))

;; Return if OPERAND is valid as a source operand for a move instruction.
(define_predicate "move_src_operand"
  (and (
     not (
       and (match_code "plus")
           (not (match_test "(GET_CODE (XEXP (op, 0)) == REG) ^ (GET_CODE (XEXP (op,1)) == REG)"))
	 )
       )
       (match_operand 0 "general_operand"))
{
  if (microblaze_tls_referenced_p(op)
      || (flag_pic && (symbol_mentioned_p(op) || label_mentioned_p(op))))
    return false;

  return true;
})

;; Test for valid PIC call operand
(define_predicate "call_insn_plt_operand"
  (match_test "PLT_ADDR_P (op)"))

;; Return if the code of this rtx pattern is a comparison.
(define_predicate "cmp_op"
  (match_code "gt,ge,gtu,geu,lt,le,ltu,leu"))
