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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [libdecnumber/] [decimal64.h] - Blame information for rev 853

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/* Decimal 64-bit format module header for the decNumber C Library
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   Copyright (C) 2005 Free Software Foundation, Inc.
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   Contributed by IBM Corporation.  Author Mike Cowlishaw.
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   This file is part of GCC.
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   GCC is free software; you can redistribute it and/or modify it under
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   the terms of the GNU General Public License as published by the Free
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   Software Foundation; either version 2, or (at your option) any later
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   version.
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   In addition to the permissions in the GNU General Public License,
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   the Free Software Foundation gives you unlimited permission to link
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   the compiled version of this file into combinations with other
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   programs, and to distribute those combinations without any
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   restriction coming from the use of this file.  (The General Public
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   License restrictions do apply in other respects; for example, they
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   cover modification of the file, and distribution when not linked
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   into a combine executable.)
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   GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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   WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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   for more details.
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   You should have received a copy of the GNU General Public License
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   along with GCC; see the file COPYING.  If not, write to the Free
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   Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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   02110-1301, USA.  */
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#if !defined(DECIMAL64)
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#define DECIMAL64
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#define DEC64NAME     "decimal64"       /* Short name */
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#define DEC64FULLNAME "Decimal 64-bit Number"   /* Verbose name */
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#define DEC64AUTHOR   "Mike Cowlishaw"  /* Who to blame */
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#if defined(DECIMAL32)
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#error decimal64.h must precede decimal32.h for correct DECNUMDIGITS
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#endif
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  /* parameters for decimal64s */
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#define DECIMAL64_Bytes  8      /* length */
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#define DECIMAL64_Pmax   16     /* maximum precision (digits) */
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#define DECIMAL64_Emax   384    /* maximum adjusted exponent */
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#define DECIMAL64_Emin  -383    /* minimum adjusted exponent */
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#define DECIMAL64_Bias   398    /* bias for the exponent */
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#define DECIMAL64_String 24     /* maximum string length, +1 */
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  /* highest biased exponent (Elimit-1) */
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#define DECIMAL64_Ehigh  (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_Pmax+1)
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#ifndef DECNUMDIGITS
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#define DECNUMDIGITS DECIMAL64_Pmax     /* size if not already defined */
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#endif
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#ifndef DECNUMBER
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#include "decNumber.h"          /* context and number library */
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#endif
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  /* Decimal 64-bit type, accessible by bytes */
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typedef struct
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{
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  uint8_t bytes[DECIMAL64_Bytes];       /* decimal64: 1, 5, 8, 50 bits */
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} decimal64;
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  /* special values [top byte excluding sign bit; last two bits are
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     don't-care for Infinity on input, last bit don't-care for NaN] */
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#if !defined(DECIMAL_NaN)
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#define DECIMAL_NaN     0x7c    /* 0 11111 00 NaN */
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#define DECIMAL_sNaN    0x7e    /* 0 11111 10 sNaN */
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#define DECIMAL_Inf     0x78    /* 0 11110 00 Infinity */
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#endif
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  /* Macros for accessing decimal64 fields.  These assume the argument
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     is a reference (pointer) to the decimal64 structure */
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  /* Get sign */
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#define decimal64Sign(d)       ((unsigned)(d)->bytes[0]>>7)
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  /* Get combination field */
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#define decimal64Comb(d)       (((d)->bytes[0] & 0x7c)>>2)
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  /* Get exponent continuation [does not remove bias] */
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#define decimal64ExpCon(d)     ((((d)->bytes[0] & 0x03)<<6)         \
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                               | ((unsigned)(d)->bytes[1]>>2))
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  /* Set sign [this assumes sign previously 0] */
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#define decimal64SetSign(d, b) {                                    \
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    (d)->bytes[0]|=((unsigned)(b)<<7);}
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  /* Set exponent continuation [does not apply bias] */
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  /* This assumes range has been checked and exponent previously 0; type */
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  /* of exponent must be unsigned */
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#define decimal64SetExpCon(d, e) {                                  \
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    (d)->bytes[0]|=(uint8_t)((e)>>6);                                 \
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    (d)->bytes[1]|=(uint8_t)(((e)&0x3F)<<2);}
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  /* ------------------------------------------------------------------ */
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  /* Routines                                                           */
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  /* ------------------------------------------------------------------ */
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#ifdef IN_LIBGCC2
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#define decimal64FromString __decimal64FromString
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#define decimal64ToString __decimal64ToString
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#define decimal64ToEngString __decimal64ToEngString
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#define decimal64FromNumber __decimal64FromNumber
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#define decimal64ToNumber __decimal64ToNumber
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#endif
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  /* String conversions */
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decimal64 *decimal64FromString (decimal64 *, const char *, decContext *);
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char *decimal64ToString (const decimal64 *, char *);
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char *decimal64ToEngString (const decimal64 *, char *);
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  /* decNumber conversions */
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decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *);
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decNumber *decimal64ToNumber (const decimal64 *, decNumber *);
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#endif

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