gcc/sreal.h

   1 /* Definitions for simple data type for positive real numbers.
   2    Copyright (C) 2002, 2003, 2007 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_SREAL_H
  21 #define GCC_SREAL_H
  22
  23 /* SREAL_PART_BITS has to be an even number.  */
  24 #if (HOST_BITS_PER_WIDE_INT / 2) % 2 == 1
  25 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2 - 1)
  26 #else
  27 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2)
  28 #endif
  29
  30 #define uhwi unsigned HOST_WIDE_INT
  31 #define MAX_HOST_WIDE_INT (((uhwi) 1 << (HOST_BITS_PER_WIDE_INT - 1)) - 1)
  32
  33 #define SREAL_MIN_SIG ((uhwi) 1 << (SREAL_PART_BITS - 1))
  34 #define SREAL_MAX_SIG (((uhwi) 1 << SREAL_PART_BITS) - 1)
  35 #define SREAL_MAX_EXP (INT_MAX / 4)
  36
  37 #if SREAL_PART_BITS < 32
  38 #define SREAL_BITS (SREAL_PART_BITS * 2)
  39 #else
  40 #define SREAL_BITS SREAL_PART_BITS
  41 #endif
  42
  43 /* Structure for holding a simple real number.  */
  44 typedef struct sreal
  45 {
  46 #if SREAL_PART_BITS < 32
  47   unsigned HOST_WIDE_INT sig_lo;        /* Significant (lower part).  */
  48   unsigned HOST_WIDE_INT sig_hi;        /* Significant (higher part).  */
  49 #else
  50   unsigned HOST_WIDE_INT sig;           /* Significant.  */
  51 #endif
  52   signed int exp;                       /* Exponent.  */
  53 } sreal;
  54
  55 extern void dump_sreal (FILE *, sreal *);
  56 extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int);
  57 extern HOST_WIDE_INT sreal_to_int (sreal *);
  58 extern int sreal_compare (sreal *, sreal *);
  59 extern sreal *sreal_add (sreal *, sreal *, sreal *);
  60 extern sreal *sreal_sub (sreal *, sreal *, sreal *);
  61 extern sreal *sreal_mul (sreal *, sreal *, sreal *);
  62 extern sreal *sreal_div (sreal *, sreal *, sreal *);
  63
  64 #endif