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;; Predicate definitions for XSTORMY16.

;; Copyright (C) 2005, 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

;; .

;; Return 1 if OP is a shift operator.

(define_predicate "shift_operator"

  (match_code "ashift,ashiftrt,lshiftrt")

{

  enum rtx_code code = GET_CODE (op);

  return (code == ASHIFT

          || code == ASHIFTRT

          || code == LSHIFTRT);

})

;; Return 1 if this is an EQ or NE operator.

(define_predicate "equality_operator"

  (match_code "eq,ne")

{

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

          && (GET_CODE (op) == EQ || GET_CODE (op) == NE));

})

;; Return 1 if this is a comparison operator but not an EQ or NE

;; operator.

(define_predicate "inequality_operator"

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

{

  return comparison_operator (op, mode) && ! equality_operator (op, mode);

})

;; Return 1 if this is a LT, GE, LTU, or GEU operator.

(define_predicate "xstormy16_ineqsi_operator"

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

{

  enum rtx_code code = GET_CODE (op);

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

          && (code == LT || code == GE || code == LTU || code == GEU));

})

;; Predicate for MEMs that can use special 8-bit addressing.

(define_predicate "xstormy16_below100_operand"

  (match_code "mem")

{

  if (GET_MODE (op) != mode)

    return 0;

  if (GET_CODE (op) == MEM)

    op = XEXP (op, 0);

  else if (GET_CODE (op) == SUBREG

           && GET_CODE (XEXP (op, 0)) == MEM

           && !MEM_VOLATILE_P (XEXP (op, 0)))

    op = XEXP (XEXP (op, 0), 0);

  else

    return 0;

  if (GET_CODE (op) == CONST_INT)

    {

      HOST_WIDE_INT i = INTVAL (op);

      return (i >= 0x7f00 && i < 0x7fff);

    }

  return xstormy16_below100_symbol (op, HImode);

})

;; TODO: Add a comment here.

(define_predicate "xstormy16_below100_or_register"

  (match_code "mem,reg,subreg")

{

  return (xstormy16_below100_operand (op, mode)

          || register_operand (op, mode));

})

;; TODO: Add a comment here.

(define_predicate "xstormy16_splittable_below100_or_register"

  (match_code "mem,reg,subreg")

{

  if (GET_CODE (op) == MEM && MEM_VOLATILE_P (op))

    return 0;

  return (xstormy16_below100_operand (op, mode)

          || register_operand (op, mode));

})

;; Predicate for constants with exactly one bit not set.

(define_predicate "xstormy16_onebit_clr_operand"

  (match_code "const_int")

{

  HOST_WIDE_INT i;

  if (GET_CODE (op) != CONST_INT)

    return 0;

  i = ~ INTVAL (op);

  if (mode == QImode)

    i &= 0xff;

  if (mode == HImode)

    i &= 0xffff;

  return exact_log2 (i) != -1;

})

;; Predicate for constants with exactly one bit set.

(define_predicate "xstormy16_onebit_set_operand"

  (match_code "const_int")

{

  HOST_WIDE_INT i;

  if (GET_CODE (op) != CONST_INT)

    return 0;

  i = INTVAL (op);

  if (mode == QImode)

    i &= 0xff;

  if (mode == HImode)

    i &= 0xffff;

  return exact_log2 (i) != -1;

})

;; TODO: Add a comment here.

(define_predicate "nonimmediate_nonstack_operand"

  (match_code "reg,mem,subreg")

{

  /* 'Q' is for pushes, 'R' for pops.  */

  return (nonimmediate_operand (op, mode)

          && ! xstormy16_extra_constraint_p (op, 'Q')

          && ! xstormy16_extra_constraint_p (op, 'R'));

})