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;; Predicate definitions for MIPS.

;; Copyright (C) 2004, 2007 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 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

;; .

(define_predicate "const_uns_arith_operand"

  (and (match_code "const_int")

       (match_test "SMALL_OPERAND_UNSIGNED (INTVAL (op))")))

(define_predicate "uns_arith_operand"

  (ior (match_operand 0 "const_uns_arith_operand")

       (match_operand 0 "register_operand")))

(define_predicate "const_arith_operand"

  (and (match_code "const_int")

       (match_test "SMALL_OPERAND (INTVAL (op))")))

(define_predicate "arith_operand"

  (ior (match_operand 0 "const_arith_operand")

       (match_operand 0 "register_operand")))

(define_predicate "const_uimm6_operand"

  (and (match_code "const_int")

       (match_test "UIMM6_OPERAND (INTVAL (op))")))

(define_predicate "const_imm10_operand"

  (and (match_code "const_int")

       (match_test "IMM10_OPERAND (INTVAL (op))")))

(define_predicate "reg_imm10_operand"

  (ior (match_operand 0 "const_imm10_operand")

       (match_operand 0 "register_operand")))

(define_predicate "sle_operand"

  (and (match_code "const_int")

       (match_test "SMALL_OPERAND (INTVAL (op) + 1)")))

(define_predicate "sleu_operand"

  (and (match_operand 0 "sle_operand")

       (match_test "INTVAL (op) + 1 != 0")))

(define_predicate "const_0_operand"

  (and (match_code "const_int,const_double,const_vector")

       (match_test "op == CONST0_RTX (GET_MODE (op))")))

(define_predicate "reg_or_0_operand"

  (ior (and (match_operand 0 "const_0_operand")

            (match_test "!TARGET_MIPS16"))

       (match_operand 0 "register_operand")))

(define_predicate "const_1_operand"

  (and (match_code "const_int,const_double,const_vector")

       (match_test "op == CONST1_RTX (GET_MODE (op))")))

(define_predicate "reg_or_1_operand"

  (ior (match_operand 0 "const_1_operand")

       (match_operand 0 "register_operand")))

;; This is used for indexing into vectors, and hence only accepts const_int.

(define_predicate "const_0_or_1_operand"

  (and (match_code "const_int")

       (ior (match_test "op == CONST0_RTX (GET_MODE (op))")

            (match_test "op == CONST1_RTX (GET_MODE (op))"))))

(define_predicate "fpr_operand"

  (and (match_code "reg")

       (match_test "FP_REG_P (REGNO (op))")))

(define_predicate "lo_operand"

  (and (match_code "reg")

       (match_test "REGNO (op) == LO_REGNUM")))

(define_predicate "fcc_reload_operand"

  (and (match_code "reg,subreg")

       (match_test "ST_REG_P (true_regnum (op))")))

(define_special_predicate "pc_or_label_operand"

  (match_code "pc,label_ref"))

(define_predicate "const_call_insn_operand"

  (match_code "const,symbol_ref,label_ref")

{

  enum mips_symbol_type symbol_type;

  if (!mips_symbolic_constant_p (op, &symbol_type))

    return false;

  switch (symbol_type)

    {

    case SYMBOL_GENERAL:

      /* We can only use direct calls for TARGET_ABSOLUTE_ABICALLS if we

         are sure that the target function does not need $25 to be live

         on entry.  This is true for any locally-defined function because

         any such function will use %hi/%lo accesses to set up $gp.  */

      if (TARGET_ABSOLUTE_ABICALLS

          && !(GET_CODE (op) == SYMBOL_REF

               && SYMBOL_REF_DECL (op)

               && !DECL_EXTERNAL (SYMBOL_REF_DECL (op))))

        return false;

      /* If -mlong-calls, force all calls to use register addressing.  Also,

         if this function has the long_call attribute, we must use register

         addressing.  */

      return (!TARGET_LONG_CALLS

              && !(GET_CODE (op) == SYMBOL_REF

                   && SYMBOL_REF_LONG_CALL_P (op)));

    case SYMBOL_GOT_GLOBAL:

      /* Without explicit relocs, there is no special syntax for

         loading the address of a call destination into a register.

         Using "la $25,foo; jal $25" would prevent the lazy binding

         of "foo", so keep the address of global symbols with the

         jal macro.  */

      return !TARGET_EXPLICIT_RELOCS;

    default:

      return false;

    }

})

(define_predicate "call_insn_operand"

  (ior (match_operand 0 "const_call_insn_operand")

       (match_operand 0 "register_operand")))

;; A legitimate CONST_INT operand that takes more than one instruction

;; to load.

(define_predicate "splittable_const_int_operand"

  (match_code "const_int")

{

  /* When generating mips16 code, LEGITIMATE_CONSTANT_P rejects

     CONST_INTs that can't be loaded using simple insns.  */

  if (TARGET_MIPS16)

    return false;

  /* Don't handle multi-word moves this way; we don't want to introduce

     the individual word-mode moves until after reload.  */

  if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)

    return false;

  /* Otherwise check whether the constant can be loaded in a single

     instruction.  */

  return !LUI_INT (op) && !SMALL_INT (op) && !SMALL_INT_UNSIGNED (op);

})

;; A legitimate symbolic operand that takes more than one instruction

;; to load.

(define_predicate "splittable_symbolic_operand"

  (match_code "const,symbol_ref,label_ref")

{

  enum mips_symbol_type symbol_type;

  return (mips_symbolic_constant_p (op, &symbol_type)

          && mips_split_p[symbol_type]);

})

(define_predicate "move_operand"

  (match_operand 0 "general_operand")

{

  enum mips_symbol_type symbol_type;

  /* The thinking here is as follows:

     (1) The move expanders should split complex load sequences into

         individual instructions.  Those individual instructions can

         then be optimized by all rtl passes.

     (2) The target of pre-reload load sequences should not be used

         to store temporary results.  If the target register is only

         assigned one value, reload can rematerialize that value

         on demand, rather than spill it to the stack.

     (3) If we allowed pre-reload passes like combine and cse to recreate

         complex load sequences, we would want to be able to split the

         sequences before reload as well, so that the pre-reload scheduler

         can see the individual instructions.  This falls foul of (2);

         the splitter would be forced to reuse the target register for

         intermediate results.

     (4) We want to define complex load splitters for combine.  These

         splitters can request a temporary scratch register, which avoids

         the problem in (2).  They allow things like:

              (set (reg T1) (high SYM))

              (set (reg T2) (low (reg T1) SYM))

              (set (reg X) (plus (reg T2) (const_int OFFSET)))

         to be combined into:

              (set (reg T3) (high SYM+OFFSET))

              (set (reg X) (lo_sum (reg T3) SYM+OFFSET))

         if T2 is only used this once.  */

  switch (GET_CODE (op))

    {

    case CONST_INT:

      return !splittable_const_int_operand (op, mode);

    case CONST:

    case SYMBOL_REF:

    case LABEL_REF:

      if (CONST_GP_P (op))

        return true;

      return (mips_symbolic_constant_p (op, &symbol_type)

              && !mips_split_p[symbol_type]);

    default:

      return true;

    }

})

(define_predicate "consttable_operand"

  (match_test "CONSTANT_P (op)"))

(define_predicate "symbolic_operand"

  (match_code "const,symbol_ref,label_ref")

{

  enum mips_symbol_type type;

  return mips_symbolic_constant_p (op, &type);

})

(define_predicate "general_symbolic_operand"

  (match_code "const,symbol_ref,label_ref")

{

  enum mips_symbol_type type;

  return mips_symbolic_constant_p (op, &type) && type == SYMBOL_GENERAL;

})

(define_predicate "global_got_operand"

  (match_code "const,symbol_ref,label_ref")

{

  enum mips_symbol_type type;

  return mips_symbolic_constant_p (op, &type) && type == SYMBOL_GOT_GLOBAL;

})

(define_predicate "local_got_operand"

  (match_code "const,symbol_ref,label_ref")

{

  enum mips_symbol_type type;

  return mips_symbolic_constant_p (op, &type) && type == SYMBOL_GOT_LOCAL;

})

(define_predicate "stack_operand"

  (and (match_code "mem")

       (match_test "mips_stack_address_p (XEXP (op, 0), GET_MODE (op))")))

(define_predicate "macc_msac_operand"

  (ior (and (match_code "plus") (match_test "ISA_HAS_MACC"))

       (and (match_code "minus") (match_test "ISA_HAS_MSAC")))

{

  rtx mult = XEXP (op, GET_CODE (op) == PLUS ? 0 : 1);

  rtx accum = XEXP (op, GET_CODE (op) == PLUS ? 1 : 0);

  return (GET_CODE (mult) == MULT

          && REG_P (XEXP (mult, 0))

          && REG_P (XEXP (mult, 1))

          && REG_P (accum));

})

(define_predicate "equality_operator"

  (match_code "eq,ne"))

(define_predicate "extend_operator"

  (match_code "zero_extend,sign_extend"))

(define_predicate "trap_comparison_operator"

  (match_code "eq,ne,lt,ltu,ge,geu"))

(define_predicate "order_operator"

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

(define_predicate "small_data_pattern"

  (and (match_code "set,parallel,unspec,unspec_volatile,prefetch")

       (match_test "mips_small_data_pattern_p (op)")))