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;; Predicate definitions for Renesas / SuperH SH.

;; Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010

;; 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

;; .

;; TODO: Add a comment here.

(define_predicate "trapping_target_operand"

  (match_code "if_then_else")

{

  rtx cond, mem, res, tar, and_expr;

  if (GET_MODE (op) != PDImode)

    return 0;

  cond = XEXP (op, 0);

  mem = XEXP (op, 1);

  res = XEXP (op, 2);

  if (!MEM_P (mem)

      || (GET_CODE (res) != SIGN_EXTEND && GET_CODE (res) != TRUNCATE))

    return 0;

  tar = XEXP (res, 0);

  if (!rtx_equal_p (XEXP (mem, 0), tar)

      || GET_MODE (tar) != Pmode)

    return 0;

  if (GET_CODE (cond) == CONST)

    {

      cond = XEXP (cond, 0);

      if (!satisfies_constraint_Csy (tar))

        return 0;

      if (GET_CODE (tar) == CONST)

        tar = XEXP (tar, 0);

    }

  else if (!arith_reg_operand (tar, VOIDmode)

           && ! satisfies_constraint_Csy (tar))

    return 0;

  if (GET_CODE (cond) != EQ)

    return 0;

  and_expr = XEXP (cond, 0);

  return (GET_CODE (and_expr) == AND

          && rtx_equal_p (XEXP (and_expr, 0), tar)

          && CONST_INT_P (XEXP (and_expr, 1))

          && CONST_INT_P (XEXP (cond, 1))

          && INTVAL (XEXP (and_expr, 1)) == 3

          && INTVAL (XEXP (cond, 1)) == 3);

})

;; TODO: Add a comment here.

(define_predicate "and_operand"

  (match_code "subreg,reg,const_int")

{

  if (logical_operand (op, mode))

    return 1;

  /* Check mshflo.l / mshflhi.l opportunities.  */

  if (TARGET_SHMEDIA

      && mode == DImode

      && satisfies_constraint_J16 (op))

    return 1;

  return 0;

})

;; Like arith_reg_dest, but this predicate is defined with

;; define_special_predicate, not define_predicate.

(define_special_predicate "any_arith_reg_dest"

  (match_code "subreg,reg")

{

  return arith_reg_dest (op, mode);

})

;; Like register_operand, but this predicate is defined with

;; define_special_predicate, not define_predicate.

(define_special_predicate "any_register_operand"

  (match_code "subreg,reg")

{

  return register_operand (op, mode);

})

;; Returns 1 if OP is a valid source operand for an arithmetic insn.

(define_predicate "arith_operand"

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

{

  if (arith_reg_operand (op, mode))

    return 1;

  if (TARGET_SHMEDIA)

    {

      /* FIXME: We should be checking whether the CONST_INT fits in a

         signed 16-bit here, but this causes reload_cse to crash when

         attempting to transform a sequence of two 64-bit sets of the

         same register from literal constants into a set and an add,

         when the difference is too wide for an add.  */

      if (CONST_INT_P (op)

          || satisfies_constraint_Css (op))

        return 1;

      else if (GET_CODE (op) == TRUNCATE

               && REG_P (XEXP (op, 0))

               && ! system_reg_operand (XEXP (op, 0), VOIDmode)

               && (mode == VOIDmode || mode == GET_MODE (op))

               && (GET_MODE_SIZE (GET_MODE (op))

                   < GET_MODE_SIZE (GET_MODE (XEXP (op, 0))))

               && (! FP_REGISTER_P (REGNO (XEXP (op, 0)))

                   || GET_MODE_SIZE (GET_MODE (op)) == 4))

        return register_operand (XEXP (op, 0), VOIDmode);

      else

        return 0;

    }

  else if (satisfies_constraint_I08 (op))

    return 1;

  return 0;

})

;; Like above, but for DImode destinations: forbid paradoxical DImode

;; subregs, because this would lead to missing sign extensions when

;; truncating from DImode to SImode.

(define_predicate "arith_reg_dest"

  (match_code "subreg,reg")

{

  if (mode == DImode && GET_CODE (op) == SUBREG

      && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) < 8

      && TARGET_SHMEDIA)

    return 0;

  return arith_reg_operand (op, mode);

})

;; Returns 1 if OP is a normal arithmetic register.

(define_predicate "arith_reg_operand"

  (match_code "subreg,reg,sign_extend")

{

  if (register_operand (op, mode))

    {

      int regno;

      if (REG_P (op))

        regno = REGNO (op);

      else if (GET_CODE (op) == SUBREG && REG_P (SUBREG_REG (op)))

        regno = REGNO (SUBREG_REG (op));

      else

        return 1;

      return (regno != T_REG && regno != PR_REG

              && ! TARGET_REGISTER_P (regno)

              && (regno != FPUL_REG || TARGET_SH4)

              && regno != MACH_REG && regno != MACL_REG);

    }

  /* Allow a no-op sign extension - compare LOAD_EXTEND_OP.

     We allow SImode here, as not using an FP register is just a matter of

     proper register allocation.  */

  if (TARGET_SHMEDIA

      && GET_MODE (op) == DImode && GET_CODE (op) == SIGN_EXTEND

      && GET_MODE (XEXP (op, 0)) == SImode

      && GET_CODE (XEXP (op, 0)) != SUBREG)

    return register_operand (XEXP (op, 0), VOIDmode);

#if 0 /* Can't do this because of PROMOTE_MODE for unsigned vars.  */

  if (GET_MODE (op) == SImode && GET_CODE (op) == SIGN_EXTEND

      && GET_MODE (XEXP (op, 0)) == HImode

      && REG_P (XEXP (op, 0))

      && REGNO (XEXP (op, 0)) <= LAST_GENERAL_REG)

    return register_operand (XEXP (op, 0), VOIDmode);

#endif

  if (GET_MODE_CLASS (GET_MODE (op)) == MODE_VECTOR_INT

      && GET_CODE (op) == SUBREG

      && GET_MODE (SUBREG_REG (op)) == DImode

      && GET_CODE (SUBREG_REG (op)) == SIGN_EXTEND

      && GET_MODE (XEXP (SUBREG_REG (op), 0)) == SImode

      && GET_CODE (XEXP (SUBREG_REG (op), 0)) != SUBREG)

    return register_operand (XEXP (SUBREG_REG (op), 0), VOIDmode);

  return 0;

})

;; Returns 1 if OP is a valid source operand for a compare insn.

(define_predicate "arith_reg_or_0_operand"

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

{

  if (arith_reg_operand (op, mode))

    return 1;

  if (satisfies_constraint_Z (op))

    return 1;

  return 0;

})

;; TODO: Add a comment here.

(define_predicate "binary_float_operator"

  (and (match_code "plus,minus,mult,div")

       (match_test "GET_MODE (op) == mode")))

;; TODO: Add a comment here.

(define_predicate "binary_logical_operator"

  (and (match_code "and,ior,xor")

       (match_test "GET_MODE (op) == mode")))

;; Return 1 of OP is an address suitable for a cache manipulation operation.

;; MODE has the meaning as in address_operand.

(define_special_predicate "cache_address_operand"

  (match_code "plus,reg")

{

  if (GET_CODE (op) == PLUS)

    {

      if (!REG_P (XEXP (op, 0)))

        return 0;

      if (!CONST_INT_P (XEXP (op, 1))

          || (INTVAL (XEXP (op, 1)) & 31))

        return 0;

    }

  else if (!REG_P (op))

    return 0;

  return address_operand (op, mode);

})

;; Return 1 if OP is a valid source operand for shmedia cmpgt / cmpgtu.

(define_predicate "cmp_operand"

  (match_code "subreg,reg,const_int")

{

  if (satisfies_constraint_N (op))

    return 1;

  if (TARGET_SHMEDIA

      && mode != DImode && GET_CODE (op) == SUBREG

      && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) > 4)

    return 0;

  return arith_reg_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "cmpsi_operand"

  (match_code "subreg,reg,const_int")

{

  if (REG_P (op) && REGNO (op) == T_REG

      && GET_MODE (op) == SImode

      && TARGET_SH1)

    return 1;

  return arith_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "commutative_float_operator"

  (and (match_code "plus,mult")

       (match_test "GET_MODE (op) == mode")))

;; TODO: Add a comment here.

(define_predicate "equality_comparison_operator"

  (match_code "eq,ne"))

;; TODO: Add a comment here.

(define_predicate "extend_reg_operand"

  (match_code "subreg,reg,truncate")

{

  return (GET_CODE (op) == TRUNCATE

          ? arith_operand

          : arith_reg_operand) (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "extend_reg_or_0_operand"

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

{

  return (GET_CODE (op) == TRUNCATE

          ? arith_operand

          : arith_reg_or_0_operand) (op, mode);

})

;; Like arith_reg_operand, but this predicate does not accept SIGN_EXTEND.

(define_predicate "ext_dest_operand"

  (match_code "subreg,reg")

{

  return arith_reg_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "fp_arith_reg_dest"

  (match_code "subreg,reg")

{

  if (mode == DImode && GET_CODE (op) == SUBREG

      && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) < 8)

    return 0;

  return fp_arith_reg_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "fp_arith_reg_operand"

  (match_code "subreg,reg")

{

  if (register_operand (op, mode))

    {

      int regno;

      if (REG_P (op))

        regno = REGNO (op);

      else if (GET_CODE (op) == SUBREG && REG_P (SUBREG_REG (op)))

        regno = REGNO (SUBREG_REG (op));

      else

        return 1;

      return (regno >= FIRST_PSEUDO_REGISTER

              || FP_REGISTER_P (regno));

    }

  return 0;

})

;; TODO: Add a comment here.

(define_predicate "fpscr_operand"

  (match_code "reg")

{

  return (REG_P (op)

          && (REGNO (op) == FPSCR_REG

              || (REGNO (op) >= FIRST_PSEUDO_REGISTER

                  && !(reload_in_progress || reload_completed)))

          && GET_MODE (op) == PSImode);

})

;; TODO: Add a comment here.

(define_predicate "fpul_operand"

  (match_code "reg")

{

  if (TARGET_SHMEDIA)

    return fp_arith_reg_operand (op, mode);

  return (REG_P (op)

          && (REGNO (op) == FPUL_REG || REGNO (op) >= FIRST_PSEUDO_REGISTER)

          && GET_MODE (op) == mode);

})

;; TODO: Add a comment here.

(define_predicate "general_extend_operand"

  (match_code "subreg,reg,mem,truncate")

{

  return (GET_CODE (op) == TRUNCATE

          ? arith_operand

          : nonimmediate_operand) (op, mode);

})

;; Returns 1 if OP can be source of a simple move operation. Same as

;; general_operand, but a LABEL_REF is valid, PRE_DEC is invalid as

;; are subregs of system registers.

(define_predicate "general_movsrc_operand"

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

{

  if (MEM_P (op))

    {

      rtx inside = XEXP (op, 0);

      if (GET_CODE (inside) == CONST)

        inside = XEXP (inside, 0);

      if (GET_CODE (inside) == LABEL_REF)

        return 1;

      if (GET_CODE (inside) == PLUS

          && GET_CODE (XEXP (inside, 0)) == LABEL_REF

          && CONST_INT_P (XEXP (inside, 1)))

        return 1;

      /* Only post inc allowed.  */

      if (GET_CODE (inside) == PRE_DEC)

        return 0;

    }

  if ((mode == QImode || mode == HImode)

      && mode == GET_MODE (op)

      && (MEM_P (op)

          || (GET_CODE (op) == SUBREG && MEM_P (SUBREG_REG (op)))))

    {

      rtx x = XEXP ((MEM_P (op) ? op : SUBREG_REG (op)), 0);

      if (GET_CODE (x) == PLUS

          && REG_P (XEXP (x, 0))

          && CONST_INT_P (XEXP (x, 1)))

        return sh_legitimate_index_p (mode, XEXP (x, 1));

    }

  if (TARGET_SHMEDIA

      && (GET_CODE (op) == PARALLEL || GET_CODE (op) == CONST_VECTOR)

      && sh_rep_vec (op, mode))

    return 1;

  if (TARGET_SHMEDIA && 1

      && GET_CODE (op) == SUBREG && GET_MODE (op) == mode

      && SUBREG_REG (op) == const0_rtx && subreg_lowpart_p (op))

    /* FIXME */ abort (); /* return 1; */

  return general_operand (op, mode);

})

;; Returns 1 if OP can be a destination of a move. Same as

;; general_operand, but no preinc allowed.

(define_predicate "general_movdst_operand"

  (match_code "subreg,reg,mem")

{

  /* Only pre dec allowed.  */

  if (MEM_P (op) && GET_CODE (XEXP (op, 0)) == POST_INC)

    return 0;

  if (mode == DImode && TARGET_SHMEDIA && GET_CODE (op) == SUBREG

      && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) < 8

      && ! (high_life_started || reload_completed))

    return 0;

  if ((mode == QImode || mode == HImode)

      && mode == GET_MODE (op)

      && (MEM_P (op)

          || (GET_CODE (op) == SUBREG && MEM_P (SUBREG_REG (op)))))

    {

      rtx x = XEXP ((MEM_P (op) ? op : SUBREG_REG (op)), 0);

      if (GET_CODE (x) == PLUS

          && REG_P (XEXP (x, 0))

          && CONST_INT_P (XEXP (x, 1)))

        return sh_legitimate_index_p (mode, XEXP (x, 1));

    }

  return general_operand (op, mode);

})

;; Returns 1 if OP is a POST_INC on stack pointer register.

(define_predicate "sh_no_delay_pop_operand"

  (match_code "mem")

{

  rtx inside;

  inside = XEXP (op, 0);

  if (GET_CODE (op) == MEM && GET_MODE (op) == SImode

      && GET_CODE (inside) == POST_INC

      && GET_CODE (XEXP (inside, 0)) == REG

      && REGNO (XEXP (inside, 0)) == SP_REG)

    return 1;

  return 0;

})

;; Returns 1 if OP is a MEM that can be source of a simple move operation.

(define_predicate "unaligned_load_operand"

  (match_code "mem")

{

  rtx inside;

  if (!MEM_P (op) || GET_MODE (op) != mode)

    return 0;

  inside = XEXP (op, 0);

  if (GET_CODE (inside) == POST_INC)

    inside = XEXP (inside, 0);

  if (REG_P (inside))

    return 1;

  return 0;

})

;; TODO: Add a comment here.

(define_predicate "greater_comparison_operator"

  (match_code "gt,ge,gtu,geu"))

;; TODO: Add a comment here.

(define_predicate "inqhi_operand"

  (match_code "truncate")

{

  if (GET_CODE (op) != TRUNCATE || mode != GET_MODE (op))

    return 0;

  op = XEXP (op, 0);

  /* Can't use true_regnum here because copy_cost wants to know about

     SECONDARY_INPUT_RELOAD_CLASS.  */

  return REG_P (op) && FP_REGISTER_P (REGNO (op));

})

;; TODO: Add a comment here.

(define_special_predicate "int_gpr_dest"

  (match_code "subreg,reg")

{

  enum machine_mode op_mode = GET_MODE (op);

  if (GET_MODE_CLASS (op_mode) != MODE_INT

      || GET_MODE_SIZE (op_mode) >= UNITS_PER_WORD)

    return 0;

  if (! reload_completed)

    return 0;

  return true_regnum (op) <= LAST_GENERAL_REG;

})

;; TODO: Add a comment here.

(define_predicate "less_comparison_operator"

  (match_code "lt,le,ltu,leu"))

;; Returns 1 if OP is a valid source operand for a logical operation.

(define_predicate "logical_operand"

  (match_code "subreg,reg,const_int")

{

  if (TARGET_SHMEDIA

      && mode != DImode && GET_CODE (op) == SUBREG

      && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) > 4)

    return 0;

  if (arith_reg_operand (op, mode))

    return 1;

  if (TARGET_SHMEDIA)

    {

      if (satisfies_constraint_I10 (op))

        return 1;

      else

        return 0;

    }

  else if (satisfies_constraint_K08 (op))

    return 1;

  return 0;

})

;; TODO: Add a comment here.

(define_predicate "logical_operator"

  (match_code "and,ior,xor"))

;; Like arith_reg_operand, but for register source operands of narrow

;; logical SHMEDIA operations: forbid subregs of DImode / TImode regs.

(define_predicate "logical_reg_operand"

  (match_code "subreg,reg")

{

  if (TARGET_SHMEDIA

      && GET_CODE (op) == SUBREG

      && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) > 4

      && mode != DImode)

    return 0;

  return arith_reg_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "mextr_bit_offset"

  (match_code "const_int")

{

  HOST_WIDE_INT i;

  if (!CONST_INT_P (op))

    return 0;

  i = INTVAL (op);

  return i >= 1 * 8 && i <= 7 * 8 && (i & 7) == 0;

})

;; TODO: Add a comment here.

(define_predicate "minuend_operand"

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

{

  return op == constm1_rtx || extend_reg_or_0_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "noncommutative_float_operator"

  (and (match_code "minus,div")

       (match_test "GET_MODE (op) == mode")))

;; UNORDERED is only supported on SHMEDIA.

(define_predicate "sh_float_comparison_operator"

  (ior (match_operand 0 "ordered_comparison_operator")

       (and (match_test "TARGET_SHMEDIA")

            (match_code "unordered"))))

(define_predicate "shmedia_cbranch_comparison_operator"

  (ior (match_operand 0 "equality_comparison_operator")

       (match_operand 0 "greater_comparison_operator")))

;; TODO: Add a comment here.

(define_predicate "sh_const_vec"

  (match_code "const_vector")

{

  int i;

  if (GET_CODE (op) != CONST_VECTOR

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

    return 0;

  i = XVECLEN (op, 0) - 1;

  for (; i >= 0; i--)

    if (!CONST_INT_P (XVECEXP (op, 0, i)))

      return 0;

  return 1;

})

;; Determine if OP is a constant vector matching MODE with only one

;; element that is not a sign extension.  Two byte-sized elements

;; count as one.

(define_predicate "sh_1el_vec"

  (match_code "const_vector")

{

  int unit_size;

  int i, last, least, sign_ix;

  rtx sign;

  if (GET_CODE (op) != CONST_VECTOR

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

    return 0;

  /* Determine numbers of last and of least significant elements.  */

  last = XVECLEN (op, 0) - 1;

  least = TARGET_LITTLE_ENDIAN ? 0 : last;

  if (!CONST_INT_P (XVECEXP (op, 0, least)))

    return 0;

  sign_ix = least;

  if (GET_MODE_UNIT_SIZE (mode) == 1)

    sign_ix = TARGET_LITTLE_ENDIAN ? 1 : last - 1;

  if (!CONST_INT_P (XVECEXP (op, 0, sign_ix)))

    return 0;

  unit_size = GET_MODE_UNIT_SIZE (GET_MODE (op));

  sign = (INTVAL (XVECEXP (op, 0, sign_ix)) >> (unit_size * BITS_PER_UNIT - 1)

          ? constm1_rtx : const0_rtx);

  i = XVECLEN (op, 0) - 1;

  do

    if (i != least && i != sign_ix && XVECEXP (op, 0, i) != sign)

      return 0;

  while (--i);

  return 1;

})

;; Like register_operand, but take into account that SHMEDIA can use

;; the constant zero like a general register.

(define_predicate "sh_register_operand"

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

{

  if (op == CONST0_RTX (mode) && TARGET_SHMEDIA)

    return 1;

  return register_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "sh_rep_vec"

  (match_code "const_vector,parallel")

{

  int i;

  rtx x, y;

  if ((GET_CODE (op) != CONST_VECTOR && GET_CODE (op) != PARALLEL)

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

    return 0;

  i = XVECLEN (op, 0) - 2;

  x = XVECEXP (op, 0, i + 1);

  if (GET_MODE_UNIT_SIZE (mode) == 1)

    {

      y = XVECEXP (op, 0, i);

      for (i -= 2; i >= 0; i -= 2)

        if (! rtx_equal_p (XVECEXP (op, 0, i + 1), x)

            || ! rtx_equal_p (XVECEXP (op, 0, i), y))

          return 0;

    }

  else

    for (; i >= 0; i--)

      if (XVECEXP (op, 0, i) != x)

        return 0;

  return 1;

})

;; TODO: Add a comment here.

(define_predicate "shift_count_operand"

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

{

  return (CONSTANT_P (op)

          ? (CONST_INT_P (op)

             ? (unsigned) INTVAL (op) < GET_MODE_BITSIZE (mode)

             : nonmemory_operand (op, mode))

          : shift_count_reg_operand (op, mode));

})

;; TODO: Add a comment here.

(define_predicate "shift_count_reg_operand"

  (match_code "subreg,reg,zero_extend,sign_extend")

{

  if ((GET_CODE (op) == ZERO_EXTEND || GET_CODE (op) == SIGN_EXTEND

       || (GET_CODE (op) == SUBREG && SUBREG_BYTE (op) == 0))

      && (mode == VOIDmode || mode == GET_MODE (op))

      && GET_MODE_BITSIZE (GET_MODE (XEXP (op, 0))) >= 6

      && GET_MODE_CLASS (GET_MODE (XEXP (op, 0))) == MODE_INT)

    {

      mode = VOIDmode;

      do

        op = XEXP (op, 0);

      while ((GET_CODE (op) == ZERO_EXTEND || GET_CODE (op) == SIGN_EXTEND

              || GET_CODE (op) == TRUNCATE)

             && GET_MODE_BITSIZE (GET_MODE (XEXP (op, 0))) >= 6

             && GET_MODE_CLASS (GET_MODE (XEXP (op, 0))) == MODE_INT);

    }

  return arith_reg_operand (op, mode);

})

;; TODO: Add a comment here.

(define_predicate "shift_operator"

  (match_code "ashift,ashiftrt,lshiftrt"))

;; TODO: Add a comment here.

(define_predicate "symbol_ref_operand"

  (match_code "symbol_ref"))

;; Same as target_reg_operand, except that label_refs and symbol_refs

;; are accepted before reload.

(define_special_predicate "target_operand"

  (match_code "subreg,reg,label_ref,symbol_ref,const,unspec")

{

  if (mode != VOIDmode && mode != Pmode)

    return 0;

  if ((GET_MODE (op) == Pmode || GET_MODE (op) == VOIDmode)

      && satisfies_constraint_Csy (op))

    return ! reload_completed;

  return target_reg_operand (op, mode);

})

;; Accept pseudos and branch target registers.

(define_special_predicate "target_reg_operand"

  (match_code "subreg,reg")

{

  if (mode == VOIDmode

     ? GET_MODE (op) != Pmode && GET_MODE (op) != PDImode

     : mode != GET_MODE (op))

    return 0;

  if (GET_CODE (op) == SUBREG)

    op = XEXP (op, 0);

  if (!REG_P (op))

    return 0;

  /* We must protect ourselves from matching pseudos that are virtual

     register, because they will eventually be replaced with hardware

     registers that aren't branch-target registers.  */

  if (REGNO (op) > LAST_VIRTUAL_REGISTER

      || TARGET_REGISTER_P (REGNO (op)))

    return 1;

  return 0;

})

;; TODO: Add a comment here.

(define_special_predicate "trunc_hi_operand"

  (match_code "subreg,reg,truncate")

{

  enum machine_mode op_mode = GET_MODE (op);

  if (op_mode != SImode && op_mode != DImode

      && op_mode != V4HImode && op_mode != V2SImode)

    return 0;

  return extend_reg_operand (op, mode);

})

;; Return 1 of OP is an address suitable for an unaligned access instruction.

(define_special_predicate "ua_address_operand"

  (match_code "subreg,reg,plus")

{

  if (GET_CODE (op) == PLUS

      && (! satisfies_constraint_I06 (XEXP (op, 1))))

    return 0;

  return address_operand (op, QImode);

})

;; TODO: Add a comment here.

(define_predicate "ua_offset"

  (match_code "const_int")

{

  return satisfies_constraint_I06 (op);

})

;; TODO: Add a comment here.

(define_predicate "unary_float_operator"

  (and (match_code "abs,neg,sqrt")

       (match_test "GET_MODE (op) == mode")))

;; Return 1 if OP is a valid source operand for xor.

(define_predicate "xor_operand"

  (match_code "subreg,reg,const_int")

{

  if (CONST_INT_P (op))

    return (TARGET_SHMEDIA

            ? (satisfies_constraint_I06 (op)

               || (!can_create_pseudo_p () && INTVAL (op) == 0xff))

            : satisfies_constraint_K08 (op));

  if (TARGET_SHMEDIA

      && mode != DImode && GET_CODE (op) == SUBREG

      && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) > 4)

    return 0;

  return arith_reg_operand (op, mode);

})

(define_predicate "bitwise_memory_operand"

  (match_code "mem")

{

  if (MEM_P (op))

    {

      if (REG_P (XEXP (op, 0)))

        return 1;

      if (GET_CODE (XEXP (op, 0)) == PLUS

          && REG_P (XEXP (XEXP (op, 0), 0))

          && satisfies_constraint_K12 (XEXP (XEXP (op, 0), 1)))

        return 1;

    }

  return 0;

})