decimal128.h revision 1.1
1 1.1 mrg /* Decimal 128-bit format module header for the decNumber C Library. 2 1.1 mrg Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc. 3 1.1 mrg Contributed by IBM Corporation. Author Mike Cowlishaw. 4 1.1 mrg 5 1.1 mrg This file is part of GCC. 6 1.1 mrg 7 1.1 mrg GCC is free software; you can redistribute it and/or modify it under 8 1.1 mrg the terms of the GNU General Public License as published by the Free 9 1.1 mrg Software Foundation; either version 3, or (at your option) any later 10 1.1 mrg version. 11 1.1 mrg 12 1.1 mrg GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 1.1 mrg WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 1.1 mrg FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 1.1 mrg for more details. 16 1.1 mrg 17 1.1 mrg Under Section 7 of GPL version 3, you are granted additional 18 1.1 mrg permissions described in the GCC Runtime Library Exception, version 19 1.1 mrg 3.1, as published by the Free Software Foundation. 20 1.1 mrg 21 1.1 mrg You should have received a copy of the GNU General Public License and 22 1.1 mrg a copy of the GCC Runtime Library Exception along with this program; 23 1.1 mrg see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 1.1 mrg <http://www.gnu.org/licenses/>. */ 25 1.1 mrg 26 1.1 mrg /* ------------------------------------------------------------------ */ 27 1.1 mrg /* Decimal 128-bit format module header */ 28 1.1 mrg /* ------------------------------------------------------------------ */ 29 1.1 mrg 30 1.1 mrg #if !defined(DECIMAL128) 31 1.1 mrg #define DECIMAL128 32 1.1 mrg #define DEC128NAME "decimal128" /* Short name */ 33 1.1 mrg #define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */ 34 1.1 mrg #define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */ 35 1.1 mrg 36 1.1 mrg /* parameters for decimal128s */ 37 1.1 mrg #define DECIMAL128_Bytes 16 /* length */ 38 1.1 mrg #define DECIMAL128_Pmax 34 /* maximum precision (digits) */ 39 1.1 mrg #define DECIMAL128_Emax 6144 /* maximum adjusted exponent */ 40 1.1 mrg #define DECIMAL128_Emin -6143 /* minimum adjusted exponent */ 41 1.1 mrg #define DECIMAL128_Bias 6176 /* bias for the exponent */ 42 1.1 mrg #define DECIMAL128_String 43 /* maximum string length, +1 */ 43 1.1 mrg #define DECIMAL128_EconL 12 /* exp. continuation length */ 44 1.1 mrg /* highest biased exponent (Elimit-1) */ 45 1.1 mrg #define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1) 46 1.1 mrg 47 1.1 mrg /* check enough digits, if pre-defined */ 48 1.1 mrg #if defined(DECNUMDIGITS) 49 1.1 mrg #if (DECNUMDIGITS<DECIMAL128_Pmax) 50 1.1 mrg #error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use 51 1.1 mrg #endif 52 1.1 mrg #endif 53 1.1 mrg 54 1.1 mrg #ifndef DECNUMDIGITS 55 1.1 mrg #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/ 56 1.1 mrg #endif 57 1.1 mrg #ifndef DECNUMBER 58 1.1 mrg #include "decNumber.h" /* context and number library */ 59 1.1 mrg #endif 60 1.1 mrg 61 1.1 mrg /* Decimal 128-bit type, accessible by bytes */ 62 1.1 mrg typedef struct { 63 1.1 mrg uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/ 64 1.1 mrg } decimal128; 65 1.1 mrg 66 1.1 mrg /* special values [top byte excluding sign bit; last two bits are */ 67 1.1 mrg /* don't-care for Infinity on input, last bit don't-care for NaN] */ 68 1.1 mrg #if !defined(DECIMAL_NaN) 69 1.1 mrg #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ 70 1.1 mrg #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ 71 1.1 mrg #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ 72 1.1 mrg #endif 73 1.1 mrg 74 1.1 mrg #include "decimal128Local.h" 75 1.1 mrg 76 1.1 mrg /* ---------------------------------------------------------------- */ 77 1.1 mrg /* Routines */ 78 1.1 mrg /* ---------------------------------------------------------------- */ 79 1.1 mrg 80 1.1 mrg #include "decimal128Symbols.h" 81 1.1 mrg 82 1.1 mrg #ifdef __cplusplus 83 1.1 mrg extern "C" { 84 1.1 mrg #endif 85 1.1 mrg 86 1.1 mrg /* String conversions */ 87 1.1 mrg decimal128 * decimal128FromString(decimal128 *, const char *, decContext *); 88 1.1 mrg char * decimal128ToString(const decimal128 *, char *); 89 1.1 mrg char * decimal128ToEngString(const decimal128 *, char *); 90 1.1 mrg 91 1.1 mrg /* decNumber conversions */ 92 1.1 mrg decimal128 * decimal128FromNumber(decimal128 *, const decNumber *, 93 1.1 mrg decContext *); 94 1.1 mrg decNumber * decimal128ToNumber(const decimal128 *, decNumber *); 95 1.1 mrg 96 1.1 mrg /* Format-dependent utilities */ 97 1.1 mrg uint32_t decimal128IsCanonical(const decimal128 *); 98 1.1 mrg decimal128 * decimal128Canonical(decimal128 *, const decimal128 *); 99 1.1 mrg 100 1.1 mrg #ifdef __cplusplus 101 1.1 mrg } 102 1.1 mrg #endif 103 1.1 mrg 104 1.1 mrg #endif 105
Indexes created Thu May 14 00:25:00 UTC 2026