gcc/sreal.h

   1 /* Definitions for simple data type for positive real numbers.
   2    Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 #ifndef GCC_SREAL_H
  22 #define GCC_SREAL_H
  23
  24 /* SREAL_PART_BITS has to be an even number.  */
  25 #if (HOST_BITS_PER_WIDE_INT / 2) % 2 == 1
  26 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2 - 1)
  27 #else
  28 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2)
  29 #endif
  30
  31 #define uhwi unsigned HOST_WIDE_INT
  32 #define MAX_HOST_WIDE_INT (((uhwi) 1 << (HOST_BITS_PER_WIDE_INT - 1)) - 1)
  33
  34 #define SREAL_MIN_SIG ((uhwi) 1 << (SREAL_PART_BITS - 1))
  35 #define SREAL_MAX_SIG (((uhwi) 1 << SREAL_PART_BITS) - 1)
  36 #define SREAL_MAX_EXP (INT_MAX / 4)
  37
  38 #if SREAL_PART_BITS < 32
  39 #define SREAL_BITS (SREAL_PART_BITS * 2)
  40 #else
  41 #define SREAL_BITS SREAL_PART_BITS
  42 #endif
  43
  44 /* Structure for holding a simple real number.  */
  45 typedef struct sreal
  46 {
  47 #if SREAL_PART_BITS < 32
  48   unsigned HOST_WIDE_INT sig_lo;        /* Significant (lower part).  */
  49   unsigned HOST_WIDE_INT sig_hi;        /* Significant (higher part).  */
  50 #else
  51   unsigned HOST_WIDE_INT sig;           /* Significant.  */
  52 #endif
  53   signed int exp;                       /* Exponent.  */
  54 } sreal;
  55
  56 extern void dump_sreal (FILE *, sreal *);
  57 extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int);
  58 extern HOST_WIDE_INT sreal_to_int (sreal *);
  59 extern int sreal_compare (sreal *, sreal *);
  60 extern sreal *sreal_add (sreal *, sreal *, sreal *);
  61 extern sreal *sreal_sub (sreal *, sreal *, sreal *);
  62 extern sreal *sreal_mul (sreal *, sreal *, sreal *);
  63 extern sreal *sreal_div (sreal *, sreal *, sreal *);
  64
  65 #endif