100 lines
4.1 KiB
C
100 lines
4.1 KiB
C
|
/* Decimal 128-bit format module header for the decNumber C Library.
|
||
|
|
Copyright (C) 2005, 2007 Free Software Foundation, Inc.
|
||
|
|
Contributed by IBM Corporation. Author Mike Cowlishaw.
|
||
|
|
|
||
|
|
This file is part of GCC.
|
||
|
|
|
||
|
|
GCC is free software; you can redistribute it and/or modify it under
|
||
|
|
the terms of the GNU General Public License as published by the Free
|
||
|
|
Software Foundation; either version 2, or (at your option) any later
|
||
|
|
version.
|
||
|
|
|
||
|
|
In addition to the permissions in the GNU General Public License,
|
||
|
|
the Free Software Foundation gives you unlimited permission to link
|
||
|
|
the compiled version of this file into combinations with other
|
||
|
|
programs, and to distribute those combinations without any
|
||
|
|
restriction coming from the use of this file. (The General Public
|
||
|
|
License restrictions do apply in other respects; for example, they
|
||
|
|
cover modification of the file, and distribution when not linked
|
||
|
|
into a combine executable.)
|
||
|
|
|
||
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
|
|
for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with GCC; see the file COPYING. If not, write to the Free
|
||
|
|
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
|
||
|
|
02110-1301, USA. */
|
||
|
|
|
||
|
|
/* ------------------------------------------------------------------ */
|
||
|
|
/* Decimal 128-bit format module header */
|
||
|
|
/* ------------------------------------------------------------------ */
|
||
|
|
|
||
|
|
#ifndef DECIMAL128_H
|
||
|
|
#define DECIMAL128_H
|
||
|
|
|
||
|
|
#define DEC128NAME "decimal128" /* Short name */
|
||
|
|
#define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */
|
||
|
|
#define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */
|
||
|
|
|
||
|
|
/* parameters for decimal128s */
|
||
|
|
#define DECIMAL128_Bytes 16 /* length */
|
||
|
|
#define DECIMAL128_Pmax 34 /* maximum precision (digits) */
|
||
|
|
#define DECIMAL128_Emax 6144 /* maximum adjusted exponent */
|
||
|
|
#define DECIMAL128_Emin -6143 /* minimum adjusted exponent */
|
||
|
|
#define DECIMAL128_Bias 6176 /* bias for the exponent */
|
||
|
|
#define DECIMAL128_String 43 /* maximum string length, +1 */
|
||
|
|
#define DECIMAL128_EconL 12 /* exp. continuation length */
|
||
|
|
/* highest biased exponent (Elimit-1) */
|
||
|
|
#define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1)
|
||
|
|
|
||
|
|
/* check enough digits, if pre-defined */
|
||
|
|
#if defined(DECNUMDIGITS)
|
||
|
|
#if (DECNUMDIGITS<DECIMAL128_Pmax)
|
||
|
|
#error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef DECNUMDIGITS
|
||
|
|
#define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/
|
||
|
|
#endif
|
||
|
|
#include "libdecnumber/decNumber.h"
|
||
|
|
|
||
|
|
/* Decimal 128-bit type, accessible by bytes */
|
||
|
|
typedef struct {
|
||
|
|
uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/
|
||
|
|
} decimal128;
|
||
|
|
|
||
|
|
/* special values [top byte excluding sign bit; last two bits are */
|
||
|
|
/* don't-care for Infinity on input, last bit don't-care for NaN] */
|
||
|
|
#if !defined(DECIMAL_NaN)
|
||
|
|
#define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */
|
||
|
|
#define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */
|
||
|
|
#define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "decimal128Local.h"
|
||
|
|
|
||
|
|
/* ---------------------------------------------------------------- */
|
||
|
|
/* Routines */
|
||
|
|
/* ---------------------------------------------------------------- */
|
||
|
|
|
||
|
|
|
||
|
|
/* String conversions */
|
||
|
|
decimal128 * decimal128FromString(decimal128 *, const char *, decContext *);
|
||
|
|
char * decimal128ToString(const decimal128 *, char *);
|
||
|
|
char * decimal128ToEngString(const decimal128 *, char *);
|
||
|
|
|
||
|
|
/* decNumber conversions */
|
||
|
|
decimal128 * decimal128FromNumber(decimal128 *, const decNumber *,
|
||
|
|
decContext *);
|
||
|
|
decNumber * decimal128ToNumber(const decimal128 *, decNumber *);
|
||
|
|
|
||
|
|
/* Format-dependent utilities */
|
||
|
|
uint32_t decimal128IsCanonical(const decimal128 *);
|
||
|
|
decimal128 * decimal128Canonical(decimal128 *, const decimal128 *);
|
||
|
|
|
||
|
|
#endif
|