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, 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301, 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 66