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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