108 lines
4.2 KiB
C
108 lines
4.2 KiB
C
/* Decimal 64-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.
|
|
|
|
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(DECIMAL64)
|
|
#define DECIMAL64
|
|
#define DEC64NAME "decimal64" /* Short name */
|
|
#define DEC64FULLNAME "Decimal 64-bit Number" /* Verbose name */
|
|
#define DEC64AUTHOR "Mike Cowlishaw" /* Who to blame */
|
|
|
|
#if defined(DECIMAL32)
|
|
#error decimal64.h must precede decimal32.h for correct DECNUMDIGITS
|
|
#endif
|
|
|
|
/* parameters for decimal64s */
|
|
#define DECIMAL64_Bytes 8 /* length */
|
|
#define DECIMAL64_Pmax 16 /* maximum precision (digits) */
|
|
#define DECIMAL64_Emax 384 /* maximum adjusted exponent */
|
|
#define DECIMAL64_Emin -383 /* minimum adjusted exponent */
|
|
#define DECIMAL64_Bias 398 /* bias for the exponent */
|
|
#define DECIMAL64_String 24 /* maximum string length, +1 */
|
|
/* highest biased exponent (Elimit-1) */
|
|
#define DECIMAL64_Ehigh (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_Pmax+1)
|
|
|
|
#ifndef DECNUMDIGITS
|
|
#define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined */
|
|
#endif
|
|
#ifndef DECNUMBER
|
|
#include "decNumber.h" /* context and number library */
|
|
#endif
|
|
|
|
/* Decimal 64-bit type, accessible by bytes */
|
|
typedef struct
|
|
{
|
|
uint8_t bytes[DECIMAL64_Bytes]; /* decimal64: 1, 5, 8, 50 bits */
|
|
} decimal64;
|
|
|
|
/* 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 decimal64 fields. These assume the argument
|
|
is a reference (pointer) to the decimal64 structure */
|
|
/* Get sign */
|
|
#define decimal64Sign(d) ((unsigned)(d)->bytes[0]>>7)
|
|
|
|
/* Get combination field */
|
|
#define decimal64Comb(d) (((d)->bytes[0] & 0x7c)>>2)
|
|
|
|
/* Get exponent continuation [does not remove bias] */
|
|
#define decimal64ExpCon(d) ((((d)->bytes[0] & 0x03)<<6) \
|
|
| ((unsigned)(d)->bytes[1]>>2))
|
|
|
|
/* Set sign [this assumes sign previously 0] */
|
|
#define decimal64SetSign(d, b) { \
|
|
(d)->bytes[0]|=((unsigned)(b)<<7);}
|
|
|
|
/* Set exponent continuation [does not apply bias] */
|
|
/* This assumes range has been checked and exponent previously 0; type */
|
|
/* of exponent must be unsigned */
|
|
#define decimal64SetExpCon(d, e) { \
|
|
(d)->bytes[0]|=(uint8_t)((e)>>6); \
|
|
(d)->bytes[1]|=(uint8_t)(((e)&0x3F)<<2);}
|
|
|
|
/* ------------------------------------------------------------------ */
|
|
/* Routines */
|
|
/* ------------------------------------------------------------------ */
|
|
|
|
#ifdef IN_LIBGCC2
|
|
#define decimal64FromString __decimal64FromString
|
|
#define decimal64ToString __decimal64ToString
|
|
#define decimal64ToEngString __decimal64ToEngString
|
|
#define decimal64FromNumber __decimal64FromNumber
|
|
#define decimal64ToNumber __decimal64ToNumber
|
|
#endif
|
|
|
|
/* String conversions */
|
|
decimal64 *decimal64FromString (decimal64 *, const char *, decContext *);
|
|
char *decimal64ToString (const decimal64 *, char *);
|
|
char *decimal64ToEngString (const decimal64 *, char *);
|
|
|
|
/* decNumber conversions */
|
|
decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *);
|
|
decNumber *decimal64ToNumber (const decimal64 *, decNumber *);
|
|
|
|
#endif
|