decimal128.h (4201B)
1 /* Decimal 128-bit format module header for the decNumber C Library. 2 Copyright (C) 2005, 2007 Free Software Foundation, Inc. 3 Contributed by IBM Corporation. Author Mike Cowlishaw. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 2, or (at your option) any later 10 version. 11 12 In addition to the permissions in the GNU General Public License, 13 the Free Software Foundation gives you unlimited permission to link 14 the compiled version of this file into combinations with other 15 programs, and to distribute those combinations without any 16 restriction coming from the use of this file. (The General Public 17 License restrictions do apply in other respects; for example, they 18 cover modification of the file, and distribution when not linked 19 into a combine executable.) 20 21 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 22 WARRANTY; without even the implied warranty of MERCHANTABILITY or 23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 24 for more details. 25 26 You should have received a copy of the GNU General Public License 27 along with GCC; see the file COPYING. If not, write to the Free 28 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 29 02110-1301, USA. */ 30 31 /* ------------------------------------------------------------------ */ 32 /* Decimal 128-bit format module header */ 33 /* ------------------------------------------------------------------ */ 34 35 #ifndef DECIMAL128_H 36 #define DECIMAL128_H 37 38 #define DEC128NAME "decimal128" /* Short name */ 39 #define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */ 40 #define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */ 41 42 /* parameters for decimal128s */ 43 #define DECIMAL128_Bytes 16 /* length */ 44 #define DECIMAL128_Pmax 34 /* maximum precision (digits) */ 45 #define DECIMAL128_Emax 6144 /* maximum adjusted exponent */ 46 #define DECIMAL128_Emin -6143 /* minimum adjusted exponent */ 47 #define DECIMAL128_Bias 6176 /* bias for the exponent */ 48 #define DECIMAL128_String 43 /* maximum string length, +1 */ 49 #define DECIMAL128_EconL 12 /* exp. continuation length */ 50 /* highest biased exponent (Elimit-1) */ 51 #define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1) 52 53 /* check enough digits, if pre-defined */ 54 #if defined(DECNUMDIGITS) 55 #if (DECNUMDIGITS<DECIMAL128_Pmax) 56 #error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use 57 #endif 58 #endif 59 60 #ifndef DECNUMDIGITS 61 #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/ 62 #endif 63 #include "libdecnumber/decNumber.h" 64 65 /* Decimal 128-bit type, accessible by bytes */ 66 typedef struct { 67 uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/ 68 } decimal128; 69 70 /* special values [top byte excluding sign bit; last two bits are */ 71 /* don't-care for Infinity on input, last bit don't-care for NaN] */ 72 #if !defined(DECIMAL_NaN) 73 #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ 74 #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ 75 #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ 76 #endif 77 78 #include "decimal128Local.h" 79 80 /* ---------------------------------------------------------------- */ 81 /* Routines */ 82 /* ---------------------------------------------------------------- */ 83 84 85 /* String conversions */ 86 decimal128 * decimal128FromString(decimal128 *, const char *, decContext *); 87 char * decimal128ToString(const decimal128 *, char *); 88 char * decimal128ToEngString(const decimal128 *, char *); 89 90 /* decNumber conversions */ 91 decimal128 * decimal128FromNumber(decimal128 *, const decNumber *, 92 decContext *); 93 decNumber * decimal128ToNumber(const decimal128 *, decNumber *); 94 95 /* Format-dependent utilities */ 96 uint32_t decimal128IsCanonical(const decimal128 *); 97 decimal128 * decimal128Canonical(decimal128 *, const decimal128 *); 98 99 #endif