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 65