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/* Definitions for simple data type for positive real numbers.

   Copyright (C) 2002, 2003, 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

<http://www.gnu.org/licenses/>.  */

#ifndef GCC_SREAL_H

#define GCC_SREAL_H

/* SREAL_PART_BITS has to be an even number.  */

#if (HOST_BITS_PER_WIDE_INT / 2) % 2 == 1

#define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2 - 1)

#else

#define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2)

#endif

#define uhwi unsigned HOST_WIDE_INT

#define MAX_HOST_WIDE_INT (((uhwi) 1 << (HOST_BITS_PER_WIDE_INT - 1)) - 1)

#define SREAL_MIN_SIG ((uhwi) 1 << (SREAL_PART_BITS - 1))

#define SREAL_MAX_SIG (((uhwi) 1 << SREAL_PART_BITS) - 1)

#define SREAL_MAX_EXP (INT_MAX / 4)

#if SREAL_PART_BITS < 32

#define SREAL_BITS (SREAL_PART_BITS * 2)

#else

#define SREAL_BITS SREAL_PART_BITS

#endif

/* Structure for holding a simple real number.  */

typedef struct sreal

{

#if SREAL_PART_BITS < 32

  unsigned HOST_WIDE_INT sig_lo;        /* Significant (lower part).  */

  unsigned HOST_WIDE_INT sig_hi;        /* Significant (higher part).  */

#else

  unsigned HOST_WIDE_INT sig;           /* Significant.  */

#endif

  signed int exp;                       /* Exponent.  */

} sreal;

extern void dump_sreal (FILE *, sreal *);

extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int);

extern HOST_WIDE_INT sreal_to_int (sreal *);

extern int sreal_compare (sreal *, sreal *);

extern sreal *sreal_add (sreal *, sreal *, sreal *);

extern sreal *sreal_sub (sreal *, sreal *, sreal *);

extern sreal *sreal_mul (sreal *, sreal *, sreal *);

extern sreal *sreal_div (sreal *, sreal *, sreal *);

#endif