sreal.h revision 1.1.1.1.4.2
1/* Definitions for simple data type for positive real numbers. 2 Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free 8Software Foundation; either version 3, or (at your option) any later 9version. 10 11GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12WARRANTY; without even the implied warranty of MERCHANTABILITY or 13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14for more details. 15 16You should have received a copy of the GNU General Public License 17along 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. */ 44typedef 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 55extern void dump_sreal (FILE *, sreal *); 56extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int); 57extern HOST_WIDE_INT sreal_to_int (sreal *); 58extern int sreal_compare (sreal *, sreal *); 59extern sreal *sreal_add (sreal *, sreal *, sreal *); 60extern sreal *sreal_sub (sreal *, sreal *, sreal *); 61extern sreal *sreal_mul (sreal *, sreal *, sreal *); 62extern sreal *sreal_div (sreal *, sreal *, sreal *); 63 64#endif 65