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/* Fixed-point arithmetic support.

   Copyright (C) 2006, 2007, 2009 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/>.  */

#ifndef GCC_FIXED_VALUE_H

#define GCC_FIXED_VALUE_H

#include "machmode.h"

#include "real.h"

#include "double-int.h"

struct GTY(()) fixed_value

{

  double_int data;              /* Store data up to 2 wide integers.  */

  enum machine_mode mode;       /* Use machine mode to know IBIT and FBIT.  */

};

#define FIXED_VALUE_TYPE struct fixed_value

#define MAX_FCONST0     18      /* For storing 18 fixed-point zeros per

                                   fract, ufract, accum, and uaccum modes .  */

#define MAX_FCONST1     8       /* For storing 8 fixed-point ones per accum

                                   and uaccum modes.  */

/* Constant fixed-point values 0 and 1.  */

extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0];

extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1];

/* Macros to access fconst0 and fconst1 via machine modes.  */

#define FCONST0(mode)   fconst0[mode - QQmode]

#define FCONST1(mode)   fconst1[mode - HAmode]

/* Return a CONST_FIXED with value R and mode M.  */

#define CONST_FIXED_FROM_FIXED_VALUE(r, m) \

  const_fixed_from_fixed_value (r, m)

extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, enum machine_mode);

/* Initialize from a decimal or hexadecimal string.  */

extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *,

                               enum machine_mode);

/* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node.  */

extern tree build_fixed (tree, FIXED_VALUE_TYPE);

/* Extend or truncate to a new mode.  */

extern bool fixed_convert (FIXED_VALUE_TYPE *, enum machine_mode,

                           const FIXED_VALUE_TYPE *, bool);

/* Convert to a fixed-point mode from an integer.  */

extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, enum machine_mode,

                                    double_int, bool, bool);

/* Convert to a fixed-point mode from a real.  */

extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, enum machine_mode,

                                     const REAL_VALUE_TYPE *, bool);

/* Convert to a real mode from a fixed-point.  */

extern void real_convert_from_fixed (REAL_VALUE_TYPE *, enum machine_mode,

                                     const FIXED_VALUE_TYPE *);

/* Compare two fixed-point objects for bitwise identity.  */

extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *);

/* Calculate a hash value.  */

extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *);

#define FIXED_VALUES_IDENTICAL(x, y)    fixed_identical (&(x), &(y))

/* Determine whether a fixed-point value X is negative.  */

#define FIXED_VALUE_NEGATIVE(x)         fixed_isneg (&(x))

/* Render F as a decimal floating point constant.  */

extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t);

/* Binary or unary arithmetic on tree_code.  */

extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *,

                              const FIXED_VALUE_TYPE *, bool);

/* Compare fixed-point values by tree_code.  */

extern bool fixed_compare (int, const FIXED_VALUE_TYPE *,

                           const FIXED_VALUE_TYPE *);

/* Determine whether a fixed-point value X is negative.  */

extern bool fixed_isneg (const FIXED_VALUE_TYPE *);

#endif /* GCC_FIXED_VALUE_H */