decimal128.h revision 169696
1/* Decimal 128-bit format module header for the decNumber C Library 2 Copyright (C) 2005 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#if !defined(DECIMAL128) 32#define DECIMAL128 33#define DEC128NAME "decimal128" /* Short name */ 34#define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */ 35#define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */ 36 37#if defined(DECIMAL32) 38#error decimal128.h must precede decimal32.h for correct DECNUMDIGITS 39#else 40#if defined(DECIMAL64) 41#error decimal128.h must precede decimal64.h for correct DECNUMDIGITS 42#endif 43#endif 44 45 /* parameters for decimal128s */ 46#define DECIMAL128_Bytes 16 /* length */ 47#define DECIMAL128_Pmax 34 /* maximum precision (digits) */ 48#define DECIMAL128_Emax 6144 /* maximum adjusted exponent */ 49#define DECIMAL128_Emin -6143 /* minimum adjusted exponent */ 50#define DECIMAL128_Bias 6176 /* bias for the exponent */ 51#define DECIMAL128_String 43 /* maximum string length, +1 */ 52 /* highest biased exponent (Elimit-1) */ 53#define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1) 54 55#ifndef DECNUMDIGITS 56#define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined */ 57#endif 58#ifndef DECNUMBER 59#include "decNumber.h" /* context and number library */ 60#endif 61 62 /* Decimal 128-bit type, accessible by bytes */ 63typedef struct 64{ 65 uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits */ 66} decimal128; 67 68 /* special values [top byte excluding sign bit; last two bits are 69 don't-care for Infinity on input, last bit don't-care for NaN] */ 70#if !defined(DECIMAL_NaN) 71#define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ 72#define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ 73#define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ 74#endif 75 76 /* Macros for accessing decimal128 fields. These assume the argument 77 is a reference (pointer) to the decimal128 structure */ 78 /* Get sign */ 79#define decimal128Sign(d) ((unsigned)(d)->bytes[0]>>7) 80 81 /* Get combination field */ 82#define decimal128Comb(d) (((d)->bytes[0] & 0x7c)>>2) 83 84 /* Get exponent continuation [does not remove bias] */ 85#define decimal128ExpCon(d) ((((d)->bytes[0] & 0x03)<<10) \ 86 | ((unsigned)(d)->bytes[1]<<2) \ 87 | ((unsigned)(d)->bytes[2]>>6)) 88 89 /* Set sign [this assumes sign previously 0] */ 90#define decimal128SetSign(d, b) { \ 91 (d)->bytes[0]|=((unsigned)(b)<<7);} 92 93 /* Set exponent continuation [does not apply bias] */ 94 /* This assumes range has been checked and exponent previously 0; */ 95 /* type of exponent must be unsigned */ 96#define decimal128SetExpCon(d, e) { \ 97 (d)->bytes[0]|=(uint8_t)((e)>>10); \ 98 (d)->bytes[1] =(uint8_t)(((e)&0x3fc)>>2); \ 99 (d)->bytes[2]|=(uint8_t)(((e)&0x03)<<6);} 100 101 /* ------------------------------------------------------------------ */ 102 /* Routines */ 103 /* ------------------------------------------------------------------ */ 104 105#ifdef IN_LIBGCC2 106#define decimal128FromString __decimal128FromString 107#define decimal128ToString __decimal128ToString 108#define decimal128ToEngString __decimal128ToEngString 109#define decimal128FromNumber __decimal128FromNumber 110#define decimal128ToNumber __decimal128ToNumber 111#endif 112 113 /* String conversions */ 114decimal128 *decimal128FromString (decimal128 *, const char *, decContext *); 115char *decimal128ToString (const decimal128 *, char *); 116char *decimal128ToEngString (const decimal128 *, char *); 117 118 /* decNumber conversions */ 119decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *); 120decNumber *decimal128ToNumber (const decimal128 *, decNumber *); 121 122#endif 123