use rtx_insn * more in reorg.c

[official-gcc.git] / gcc / config / sh / predicates.md

;; Predicate definitions for Renesas / SuperH SH.
;; Copyright (C) 2005-2015 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
;; <http://www.gnu.org/licenses/>.

;; 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);
})

;; A logical operand that can be used in an shmedia and insn.
(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 && regno != FPSCR_REG
              && 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;
})

;; Likewise arith_operand but always permits const_int.
(define_predicate "arith_or_int_operand"
  (match_code "subreg,reg,const_int,const_vector")
{
  if (arith_operand (op, mode))
    return 1;

  if (CONST_INT_P (op))
    return 1;

  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;
})

;; Returns true if OP is either a register or constant 0 or constant 1.
(define_predicate "arith_reg_or_0_or_1_operand"
  (match_code "subreg,reg,const_int,const_vector")
{
  return arith_reg_or_0_operand (op, mode) || satisfies_constraint_M (op);
})

;; Returns true if OP is a suitable constant for the minimum value of a
;; clips.b or clips.w insn.
(define_predicate "clips_min_const_int"
  (and (match_code "const_int")
       (ior (match_test "INTVAL (op) == -128")
            (match_test "INTVAL (op) == -32768"))))

;; Returns true if OP is a suitable constant for the maximum value of a
;; clips.b or clips.w insn.
(define_predicate "clips_max_const_int"
  (and (match_code "const_int")
       (ior (match_test "INTVAL (op) == 127")
            (match_test "INTVAL (op) == 32767"))))

;; Returns true if OP is a suitable constant for the maximum value of a
;; clipu.b or clipu.w insn.
(define_predicate "clipu_max_const_int"
  (and (match_code "const_int")
       (ior (match_test "INTVAL (op) == 255")
            (match_test "INTVAL (op) == 65535"))))

;; Returns 1 if OP is a floating point operator with two operands.
(define_predicate "binary_float_operator"
  (and (match_code "plus,minus,mult,div")
       (match_test "GET_MODE (op) == mode")))

;; Returns 1 if OP is a logical operator with two operands.
(define_predicate "binary_logical_operator"
  (and (match_code "and,ior,xor")
       (match_test "GET_MODE (op) == mode")))

;; Return 1 if 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);
})

;; Returns 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);
})

;; Returns true if OP is an operand that can be used as the first operand in
;; the cstoresi4 expander pattern.
(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);
})

;; Returns true if OP is a comutative float operator.
;; This predicate is currently unused.
;;(define_predicate "commutative_float_operator"
;;  (and (match_code "plus,mult")
;;       (match_test "GET_MODE (op) == mode")))

;; Returns true if OP is a equal or not equal operator.
(define_predicate "equality_comparison_operator"
  (match_code "eq,ne"))

;; Returns true if OP is an arithmetic operand that is zero extended during
;; an operation.
(define_predicate "extend_reg_operand"
  (match_code "subreg,reg,truncate")
{
  return (GET_CODE (op) == TRUNCATE
          ? arith_operand
          : arith_reg_operand) (op, mode);
})

;; Like extend_reg_operand, but also allow a constant 0.
(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);
})

;; Returns true if OP can be used as a destination register for shmedia floating
;; point to integer conversions.
(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);
})

;; Returns true if OP is a floating point register that can be used in floating
;; point arithmetic operations.
(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;
})

;; Returns true if OP is the FPSCR.
(define_predicate "fpscr_operand"
  (and (match_code "reg")
       (match_test "REGNO (op) == FPSCR_REG")))

;; Returns true if OP is a valid source operand for a FPSCR move insn.
(define_predicate "fpscr_movsrc_operand"
  (match_code "reg,subreg,mem")
{
  if (arith_reg_operand (op, mode))
    return true;

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

;; Returns true if OP is a valid destination operand for a FPSCR move insn.
(define_predicate "fpscr_movdst_operand"
  (match_code "reg,subreg,mem")
{
  if (arith_reg_dest (op, mode))
    return true;

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

;; Returns true if OP is an operand that is either the fpul hard reg or
;; a pseudo.  This prevents combine from propagating function arguments
;; in hard regs into insns that need the operand in fpul.  If it's a pseudo
;; reload can fix it up.
(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);
})

;; Returns true if OP is a valid fpul input operand for the fsca insn.
;; The value in fpul is a fixed-point value and its scaling is described
;; in the fsca insn by a mult:SF.  To allow pre-scaled fixed-point inputs
;; in fpul we have to permit things like
;;   (reg:SI)
;;   (fix:SF (float:SF (reg:SI)))
(define_predicate "fpul_fsca_operand"
  (match_code "fix,reg")
{
  if (fpul_operand (op, SImode))
    return true;
  if (GET_CODE (op) == FIX && GET_MODE (op) == SImode
      && GET_CODE (XEXP (op, 0)) == FLOAT && GET_MODE (XEXP (op, 0)) == SFmode)
    return fpul_fsca_operand (XEXP (XEXP (op, 0), 0),
                              GET_MODE (XEXP (XEXP (op, 0), 0)));
  return false;
})

;; Returns true if OP is a valid constant scale factor for the fsca insn.
(define_predicate "fsca_scale_factor"
  (and (match_code "const_double")
       (match_test "op == sh_fsca_int2sf ()")))

;; Returns true if OP is an operand that is zero extended during an operation.
(define_predicate "general_extend_operand"
  (match_code "subreg,reg,mem,truncate")
{
  if (reload_completed && GET_CODE (op) == TRUNCATE)
    return arith_operand (op, mode);

  if (MEM_P (op) || (GET_CODE (op) == SUBREG && MEM_P (SUBREG_REG (op))))
    return general_movsrc_operand (op, mode);

  return nonimmediate_operand (op, mode);
})

;; Returns 1 if OP is a simple register address.
(define_predicate "simple_mem_operand"
  (and (match_code "mem")
       (match_code "reg" "0")
       (match_test "arith_reg_operand (XEXP (op, 0), SImode)")))

;; Returns 1 if OP is a valid displacement address.
(define_predicate "displacement_mem_operand"
  (and (match_code "mem")
       (match_code "plus" "0")
       (match_code "reg" "00")
       (match_test "arith_reg_operand (XEXP (XEXP (op, 0), 0), SImode)")
       (match_test "sh_legitimate_index_p (GET_MODE (op),
                                           XEXP (XEXP (op, 0), 1),
                                           TARGET_SH2A, true)")))

;; Returns true if OP is a displacement address that can fit into a
;; 16 bit (non-SH2A) memory load / store insn.
(define_predicate "short_displacement_mem_operand"
  (and (match_code "mem")
       (match_operand 0 "displacement_mem_operand")
       (match_test "sh_disp_addr_displacement (op)
                    <= sh_max_mov_insn_displacement (GET_MODE (op), false)")))

;; Returns 1 if the operand can be used in an SH2A movu.{b|w} insn.
(define_predicate "zero_extend_movu_operand"
  (and (ior (match_operand 0 "displacement_mem_operand")
            (match_operand 0 "simple_mem_operand"))
       (ior (match_test "GET_MODE (op) == QImode")
            (match_test "GET_MODE (op) == HImode"))))

;; Returns 1 if the operand can be used in a zero_extend.
(define_predicate "zero_extend_operand"
  (ior (and (match_test "TARGET_SHMEDIA")
            (match_operand 0 "general_extend_operand"))
       (and (match_test "! TARGET_SHMEDIA")
            (match_operand 0 "arith_reg_operand"))))

;; 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 (t_reg_operand (op, mode))
    return 0;

  if (fpscr_operand (op, mode))
    return false;

  /* Disallow PC relative QImode loads, since these is no insn to do that
     and an imm8 load should be used instead.  */
  if (IS_PC_RELATIVE_LOAD_ADDR_P (op) && GET_MODE (op) == QImode)
    return false;

  if (MEM_P (op))
    {
      rtx inside = XEXP (op, 0);

      /* Disallow mems with GBR address here.  They have to go through
         separate special patterns.  */
      if ((REG_P (inside) && REGNO (inside) == GBR_REG)
          || (GET_CODE (inside) == PLUS && REG_P (XEXP (inside, 0))
              && REGNO (XEXP (inside, 0)) == GBR_REG))
        return 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 == GET_MODE (op)
      && (MEM_P (op) || (GET_CODE (op) == SUBREG && MEM_P (SUBREG_REG (op)))))
    {
      rtx mem_rtx = MEM_P (op) ? op : SUBREG_REG (op);
      rtx x = XEXP (mem_rtx, 0);

      if (! ALLOW_INDEXED_ADDRESS
          && GET_CODE (x) == PLUS && REG_P (XEXP (x, 0)) && REG_P (XEXP (x, 1)))
        return false;

      if (GET_CODE (x) == PLUS)
        {
          rtx y = XEXP (x, 0);

          if (! REG_P (y)
              && ! (GET_CODE (y) == SUBREG && REG_P (SUBREG_REG (y))))
            return false;
          y = XEXP (x, 1);
          if (! REG_P (y)
              && ! (GET_CODE (y) == SUBREG && REG_P (SUBREG_REG (y)))
              && ! CONST_INT_P (y))
            return false;
        }

      /* LRA will try to satisfy the constraints for the memory displacements
         and thus we must not reject invalid displacements in the predicate,
         or else LRA will bail out.
         FIXME: maybe remove this check completely?  */
      if (!lra_in_progress && (mode == QImode || mode == HImode)
          && GET_CODE (x) == PLUS
          && REG_P (XEXP (x, 0))
          && CONST_INT_P (XEXP (x, 1)))
        return sh_legitimate_index_p (mode, XEXP (x, 1), TARGET_SH2A, false);

      /* Allow reg+reg addressing here without validating the register
         numbers.  Usually one of the regs must be R0 or a pseudo reg.
         In some cases it can happen that arguments from hard regs are
         propagated directly into address expressions.  In this cases reload
         will have to fix it up later.  However, allow this only for native
         1, 2 or 4 byte addresses.  */
      if (can_create_pseudo_p () && GET_CODE (x) == PLUS
          && GET_MODE_SIZE (mode) <= 4
          && REG_P (XEXP (x, 0)) && REG_P (XEXP (x, 1)))
        return true;

      /* 'general_operand' does not allow volatile mems during RTL expansion to
         avoid matching arithmetic that operates on mems, it seems.
         On SH this leads to redundant sign extensions for QImode or HImode
         loads.  Thus we mimic the behavior but allow volatile mems.  */
        if (memory_address_addr_space_p (GET_MODE (mem_rtx), x,
                                         MEM_ADDR_SPACE (mem_rtx)))
          return true;
    }

  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 is a MEM that does not use displacement addressing.
(define_predicate "movsrc_no_disp_mem_operand"
  (match_code "mem")
{
  return general_movsrc_operand (op, mode) && satisfies_constraint_Snd (op);
})

;; 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")
{
  if (t_reg_operand (op, mode))
    return 0;

  if (fpscr_operand (op, mode))
    return false;

  if (MEM_P (op))
    {
      rtx inside = XEXP (op, 0);
      /* Disallow mems with GBR address here.  They have to go through
         separate special patterns.  */
      if ((REG_P (inside) && REGNO (inside) == GBR_REG)
          || (GET_CODE (inside) == PLUS && REG_P (XEXP (inside, 0))
              && REGNO (XEXP (inside, 0)) == GBR_REG))
        return 0;
    }

  /* 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
      && ! (reload_in_progress || reload_completed))
    return 0;

  if (mode == GET_MODE (op)
      && (MEM_P (op) || (GET_CODE (op) == SUBREG && MEM_P (SUBREG_REG (op)))))
    {
      rtx mem_rtx = MEM_P (op) ? op : SUBREG_REG (op);
      rtx x = XEXP (mem_rtx, 0);

      if (! ALLOW_INDEXED_ADDRESS
          && GET_CODE (x) == PLUS && REG_P (XEXP (x, 0)) && REG_P (XEXP (x, 1)))
        return false;

      if (GET_CODE (x) == PLUS)
        {
          rtx y = XEXP (x, 0);

          if (! REG_P (y)
              && ! (GET_CODE (y) == SUBREG && REG_P (SUBREG_REG (y))))
            return false;
          y = XEXP (x, 1);
          if (! REG_P (y)
              && ! (GET_CODE (y) == SUBREG && REG_P (SUBREG_REG (y)))
              && ! CONST_INT_P (y))
            return false;
        }

      /* LRA will try to satisfy the constraints for the memory displacements
         and thus we must not reject invalid displacements in the predicate,
         or else LRA will bail out.
         FIXME: maybe remove this check completely?  */
      if (!lra_in_progress && (mode == QImode || mode == HImode)
          && GET_CODE (x) == PLUS
          && REG_P (XEXP (x, 0))
          && CONST_INT_P (XEXP (x, 1)))
        return sh_legitimate_index_p (mode, XEXP (x, 1), TARGET_SH2A, false);

      /* Allow reg+reg addressing here without validating the register
         numbers.  Usually one of the regs must be R0 or a pseudo reg.
         In some cases it can happen that arguments from hard regs are
         propagated directly into address expressions.  In this cases reload
         will have to fix it up later.  However, allow this only for native
         1, 2 or 4 byte addresses.  */
      if (can_create_pseudo_p () && GET_CODE (x) == PLUS
          && GET_MODE_SIZE (mode) <= 4
          && REG_P (XEXP (x, 0)) && REG_P (XEXP (x, 1)))
        return true;

      /* 'general_operand' does not allow volatile mems during RTL expansion to
         avoid matching arithmetic that operates on mems, it seems.
         On SH this leads to redundant sign extensions for QImode or HImode
         stores.  Thus we mimic the behavior but allow volatile mems.  */
        if (memory_address_addr_space_p (GET_MODE (mem_rtx), x,
                                         MEM_ADDR_SPACE (mem_rtx)))
          return true;
    }

  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;
})

;; Returns 1 if OP is a MEM that can be used in "index_disp" combiner
;; patterns.
(define_predicate "mem_index_disp_operand"
  (match_code "mem")
{
  rtx plus0_rtx, plus1_rtx, mult_rtx;

  plus0_rtx = XEXP (op, 0);
  if (GET_CODE (plus0_rtx) != PLUS)
    return 0;

  plus1_rtx = XEXP (plus0_rtx, 0);
  if (GET_CODE (plus1_rtx) != PLUS)
    return 0;
  if (! arith_reg_operand (XEXP (plus1_rtx, 1), GET_MODE (XEXP (plus1_rtx, 1))))
    return 0;

  mult_rtx = XEXP (plus1_rtx, 0);
  if (GET_CODE (mult_rtx) != MULT)
    return 0;
  if (! arith_reg_operand (XEXP (mult_rtx, 0), GET_MODE (XEXP (mult_rtx, 0)))
      || ! CONST_INT_P (XEXP (mult_rtx, 1)))
    return 0;

  return exact_log2 (INTVAL (XEXP (mult_rtx, 1))) > 0
         && sh_legitimate_index_p (mode, XEXP (plus0_rtx, 1), TARGET_SH2A, true);
})

;; Returns true if OP is some kind of greater comparision.
(define_predicate "greater_comparison_operator"
  (match_code "gt,ge,gtu,geu"))

;; Returns true if OP is an operand suitable for shmedia reload_inqi and
;; reload_inhi insns.
(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));
})

;; Returns true if OP is a general purpose integer register.
;; This predicate is currently unused.
;;(define_special_predicate "int_gpr_dest"
;;  (match_code "subreg,reg")
;;{
;;  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;
;;})

;; Returns true if OP is some kind of less comparison.
(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;
})

;; Returns true if OP is a valid constant source operand for a logical
;; operations tst/and/or/xor #imm,r0.
(define_predicate "const_logical_operand"
  (and (match_code "const_int")
       (match_test "satisfies_constraint_K08 (op)")))

;; Like logical_operand but allows additional constant values which can be
;; done with zero extensions.  Used for the second operand of and insns.
(define_predicate "logical_and_operand"
  (match_code "subreg,reg,const_int")
{
  if (logical_operand (op, mode))
    return 1;

  if (! TARGET_SHMEDIA
      && (satisfies_constraint_Jmb (op) || satisfies_constraint_Jmw (op)))
    return 1;

  return 0;
})

;; Returns true if OP is a logical operator.
(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);
})

;; Returns true if OP is a valid bit offset value for the shmedia mextr insns.
(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;
})

;; Returns true if OP is a constant -1, 0 or an zero extended register that
;; can be used as an operator in the *subsi3_media insn.
(define_predicate "minuend_operand"
  (match_code "subreg,reg,truncate,const_int")
{
  return op == constm1_rtx || extend_reg_or_0_operand (op, mode);
})

;; Returns true if OP is a noncommutative floating point operator.
;; This predicate is currently unused.
;;(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")))

;; Returns true if OP is a constant vector.
(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);
})

;; Returns true if OP is a vector which is composed of one element that is
;; repeated.
(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;
})

;; Returns true if OP is a valid shift count operand for shift operations.
(define_predicate "shift_count_operand"
  (match_code "const_int,const_double,const,symbol_ref,label_ref,subreg,reg,
               zero_extend,sign_extend")
{
  /* Allow T_REG as shift count for dynamic shifts, although it is not
     really possible.  It will then be copied to a general purpose reg.  */
  if (! TARGET_SHMEDIA)
    return const_int_operand (op, mode) || arith_reg_operand (op, mode)
           || (TARGET_DYNSHIFT && t_reg_operand (op, mode));

  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));
})

;; Returns true if OP is a valid shift count operand in a register which can
;; be used by shmedia shift insns.
(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);
})

;; Predicates for matching operands that are constant shift
;; amounts 1, 2, 8, 16.
(define_predicate "p27_shift_count_operand"
  (and (match_code "const_int")
       (match_test "satisfies_constraint_P27 (op)")))

(define_predicate "not_p27_shift_count_operand"
  (and (match_code "const_int")
       (match_test "! satisfies_constraint_P27 (op)")))

;; For right shifts the constant 1 is a special case because the shlr insn
;; clobbers the T_REG and is handled by the T_REG clobbering version of the
;; insn, which is also used for non-P27 shift sequences.
(define_predicate "p27_rshift_count_operand"
  (and (match_code "const_int")
       (match_test "satisfies_constraint_P27 (op)")
       (match_test "! satisfies_constraint_M (op)")))

(define_predicate "not_p27_rshift_count_operand"
  (and (match_code "const_int")
       (ior (match_test "! satisfies_constraint_P27 (op)")
            (match_test "satisfies_constraint_M (op)"))))

;; Returns true if OP is some kind of a shift operator.
(define_predicate "shift_operator"
  (match_code "ashift,ashiftrt,lshiftrt"))

;; Returns true if OP is a symbol reference.
(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);
})

;; A predicate that accepts 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;
})

;; Returns true if OP is a valid operand for the shmedia mperm.w insn.
(define_special_predicate "trunc_hi_operand"
  (match_code "subreg,reg,truncate")
{
  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);
})

;; Returns true if 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);
})

;; Returns true if OP is a valid offset for an unaligned memory address.
(define_predicate "ua_offset"
  (match_code "const_int")
{
  return satisfies_constraint_I06 (op);
})

;; Returns true if OP is a floating point operator with one operand.
(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;
})

;; A predicate that matches any expression for which there is an
;; insn pattern that sets the T bit.
(define_predicate "treg_set_expr"
  (match_test "sh_recog_treg_set_expr (op, mode)"))

;; Same as treg_set_expr but disallow constants 0 and 1 which can be loaded
;; into the T bit.
(define_predicate "treg_set_expr_not_const01"
  (and (match_test "op != const0_rtx")
       (match_test "op != const1_rtx")
       (match_operand 0 "treg_set_expr")))

;; A predicate describing the T bit register in any form.
(define_predicate "t_reg_operand"
  (match_code "reg,subreg,sign_extend,zero_extend")
{
  switch (GET_CODE (op))
    {
      case REG:
        return REGNO (op) == T_REG;

      case SUBREG:
        return REG_P (SUBREG_REG (op)) && REGNO (SUBREG_REG (op)) == T_REG;

      case ZERO_EXTEND:
      case SIGN_EXTEND:
        if (REG_P (XEXP (op, 0)) && REGNO (XEXP (op, 0)) == T_REG)
          return true;
        return GET_CODE (XEXP (op, 0)) == SUBREG
               && REG_P (SUBREG_REG (XEXP (op, 0)))
               && REGNO (SUBREG_REG (XEXP (op, 0))) == T_REG;

      default:
        return 0;
    }
})

;; A predicate describing a negated T bit register.
(define_predicate "negt_reg_operand"
  (match_code "subreg,xor")
{
  switch (GET_CODE (op))
    {
      case XOR:
        return t_reg_operand (XEXP (op, 0), GET_MODE (XEXP (op, 0)))
               && satisfies_constraint_M (XEXP (op, 1));

      case SUBREG:
        return negt_reg_operand (XEXP (op, 0), GET_MODE (XEXP (op, 0)));

      default:
        return 0;
    }
})

;; A predicate that returns true if OP is a valid construct around the T bit
;; that can be used as an operand for conditional branches.
(define_predicate "cbranch_treg_value"
  (and (match_code "eq,ne,reg,subreg,xor,sign_extend,zero_extend")
       (match_test "sh_eval_treg_value (op) >= 0")))

;; Returns true if OP is arith_reg_operand or t_reg_operand.
(define_predicate "arith_reg_or_t_reg_operand"
  (ior (match_operand 0 "arith_reg_operand")
       (match_operand 0 "t_reg_operand")))

(define_predicate "arith_reg_or_treg_set_expr"
  (ior (match_operand 0 "arith_reg_operand")
       (match_operand 0 "treg_set_expr")))

;; A predicate describing the negated value of the T bit register shifted
;; left by 31.
(define_predicate "negt_reg_shl31_operand"
  (match_code "plus,minus,if_then_else")
{
  /* (minus:SI (const_int -2147483648)  ;; 0xffffffff80000000
               (ashift:SI (match_operand:SI 1 "t_reg_operand")
                          (const_int 31)))
  */
  if (GET_CODE (op) == MINUS && satisfies_constraint_Jhb (XEXP (op, 0))
      && GET_CODE (XEXP (op, 1)) == ASHIFT
      && t_reg_operand (XEXP (XEXP (op, 1), 0), SImode)
      && CONST_INT_P (XEXP (XEXP (op, 1), 1))
      && INTVAL (XEXP (XEXP (op, 1), 1)) == 31)
    return true;

  /* (plus:SI (ashift:SI (match_operand:SI 1 "t_reg_operand")
                         (const_int 31))
              (const_int -2147483648))  ;; 0xffffffff80000000
  */
  if (GET_CODE (op) == PLUS && satisfies_constraint_Jhb (XEXP (op, 1))
      && GET_CODE (XEXP (op, 0)) == ASHIFT
      && t_reg_operand (XEXP (XEXP (op, 0), 0), SImode)
      && CONST_INT_P (XEXP (XEXP (op, 0), 1))
      && INTVAL (XEXP (XEXP (op, 0), 1)) == 31)
    return true;

  /* (plus:SI (mult:SI (match_operand:SI 1 "t_reg_operand")
                       (const_int -2147483648))  ;; 0xffffffff80000000
              (const_int -2147483648))
  */
  if (GET_CODE (op) == PLUS && satisfies_constraint_Jhb (XEXP (op, 1))
      && GET_CODE (XEXP (op, 0)) == MULT
      && t_reg_operand (XEXP (XEXP (op, 0), 0), SImode)
      && satisfies_constraint_Jhb (XEXP (XEXP (op, 0), 1)))
    return true;

  /* (minus:SI (const_int -2147483648)  ;; 0xffffffff80000000
               (mult:SI (match_operand:SI 1 "t_reg_operand")
                        (const_int -2147483648)))
  */
  if (GET_CODE (op) == MINUS
      && satisfies_constraint_Jhb (XEXP (op, 0))
      && GET_CODE (XEXP (op, 1)) == MULT
      && t_reg_operand (XEXP (XEXP (op, 1), 0), SImode)
      && satisfies_constraint_Jhb (XEXP (XEXP (op, 1), 1)))
    return true;

  /*  (if_then_else:SI (match_operand:SI 1 "t_reg_operand")
                       (const_int 0)
                       (const_int -2147483648))  ;; 0xffffffff80000000
  */
  if (GET_CODE (op) == IF_THEN_ELSE && t_reg_operand (XEXP (op, 0), SImode)
      && satisfies_constraint_Z (XEXP (op, 1))
      && satisfies_constraint_Jhb (XEXP (op, 2)))
    return true;

  return false;
})

;; A predicate that determines whether a given constant is a valid
;; displacement for a GBR load/store of the specified mode.
(define_predicate "gbr_displacement"
  (match_code "const_int")
{
  const int mode_sz = GET_MODE_SIZE (mode);
  const int move_sz = mode_sz > GET_MODE_SIZE (SImode)
                                ? GET_MODE_SIZE (SImode)
                                : mode_sz;
  int max_disp = 255 * move_sz;
  if (mode_sz > move_sz)
    max_disp -= mode_sz - move_sz;

  return INTVAL (op) >= 0 && INTVAL (op) <= max_disp;
})

;; A predicate that determines whether OP is a valid GBR addressing mode
;; memory reference.
(define_predicate "gbr_address_mem"
  (match_code "mem")
{
  rtx addr = XEXP (op, 0);

  if (REG_P (addr) && REGNO (addr) == GBR_REG)
    return true;
  if (GET_CODE (addr) == PLUS
      && REG_P (XEXP (addr, 0)) && REGNO (XEXP (addr, 0)) == GBR_REG
      && gbr_displacement (XEXP (addr, 1), mode))
    return true;

  return false;
})