131 lines
5.1 KiB
C
131 lines
5.1 KiB
C
/* Decimal 128-bit format module header for the decNumber C Library
|
|
Copyright (C) 2005 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. */
|
|
|
|
#if !defined(DECIMAL128)
|
|
#define DECIMAL128
|
|
#define DEC128NAME "decimal128" /* Short name */
|
|
#define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */
|
|
#define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */
|
|
|
|
#if defined(DECIMAL32)
|
|
#error decimal128.h must precede decimal32.h for correct DECNUMDIGITS
|
|
#else
|
|
#if defined(DECIMAL64)
|
|
#error decimal128.h must precede decimal64.h for correct DECNUMDIGITS
|
|
#endif
|
|
#endif
|
|
|
|
/* 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 */
|
|
/* highest biased exponent (Elimit-1) */
|
|
#define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1)
|
|
|
|
#ifndef DECNUMDIGITS
|
|
#define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined */
|
|
#endif
|
|
#ifndef DECNUMBER
|
|
#include "decNumber.h" /* context and number library */
|
|
#endif
|
|
|
|
/* 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
|
|
|
|
/* Macros for accessing decimal128 fields. These assume the argument
|
|
is a reference (pointer) to the decimal128 structure */
|
|
/* Get sign */
|
|
#define decimal128Sign(d) ((unsigned)(d)->bytes[0]>>7)
|
|
|
|
/* Get combination field */
|
|
#define decimal128Comb(d) (((d)->bytes[0] & 0x7c)>>2)
|
|
|
|
/* Get exponent continuation [does not remove bias] */
|
|
#define decimal128ExpCon(d) ((((d)->bytes[0] & 0x03)<<10) \
|
|
| ((unsigned)(d)->bytes[1]<<2) \
|
|
| ((unsigned)(d)->bytes[2]>>6))
|
|
|
|
/* Set sign [this assumes sign previously 0] */
|
|
#define decimal128SetSign(d, b) { \
|
|
(d)->bytes[0]|=((unsigned)(b)<<7);}
|
|
|
|
/* Clear sign */
|
|
#define decimal128ClearSign(d) {(d)->bytes[0]&=~0x80;}
|
|
|
|
/* Flip sign */
|
|
#define decimal128FlipSign(d) {(d)->bytes[0]^=0x80;}
|
|
|
|
/* Set exponent continuation [does not apply bias] */
|
|
/* This assumes range has been checked and exponent previously 0; */
|
|
/* type of exponent must be unsigned */
|
|
#define decimal128SetExpCon(d, e) { \
|
|
(d)->bytes[0]|=(uint8_t)((e)>>10); \
|
|
(d)->bytes[1] =(uint8_t)(((e)&0x3fc)>>2); \
|
|
(d)->bytes[2]|=(uint8_t)(((e)&0x03)<<6);}
|
|
|
|
/* ------------------------------------------------------------------ */
|
|
/* Routines */
|
|
/* ------------------------------------------------------------------ */
|
|
|
|
#ifdef IN_LIBGCC2
|
|
#ifndef decimal128FromString
|
|
#define decimal128FromString __decimal128FromString
|
|
#define decimal128ToString __decimal128ToString
|
|
#define decimal128ToEngString __decimal128ToEngString
|
|
#define decimal128FromNumber __decimal128FromNumber
|
|
#define decimal128ToNumber __decimal128ToNumber
|
|
#endif
|
|
#endif
|
|
|
|
/* 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 *);
|
|
|
|
#endif
|