sreal.h revision 132718
1/* Definitions for simple data type for positive real numbers. 2 Copyright (C) 2002, 2003 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 2, 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 COPYING. If not, write to the Free 18Software Foundation, 59 Temple Place - Suite 330, Boston, MA 1902111-1307, 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. */ 45typedef 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 56extern void dump_sreal (FILE *, sreal *); 57extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int); 58extern HOST_WIDE_INT sreal_to_int (sreal *); 59extern int sreal_compare (sreal *, sreal *); 60extern sreal *sreal_add (sreal *, sreal *, sreal *); 61extern sreal *sreal_sub (sreal *, sreal *, sreal *); 62extern sreal *sreal_mul (sreal *, sreal *, sreal *); 63extern sreal *sreal_div (sreal *, sreal *, sreal *); 64 65#endif 66