123 lines
5.0 KiB
C
123 lines
5.0 KiB
C
/* Decimal 128-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(DECIMAL128)
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#define DECIMAL128
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#define DEC128NAME "decimal128" /* Short name */
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#define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */
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#define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */
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#if defined(DECIMAL32)
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#error decimal128.h must precede decimal32.h for correct DECNUMDIGITS
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#else
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#if defined(DECIMAL64)
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#error decimal128.h must precede decimal64.h for correct DECNUMDIGITS
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#endif
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#endif
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/* parameters for decimal128s */
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#define DECIMAL128_Bytes 16 /* length */
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#define DECIMAL128_Pmax 34 /* maximum precision (digits) */
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#define DECIMAL128_Emax 6144 /* maximum adjusted exponent */
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#define DECIMAL128_Emin -6143 /* minimum adjusted exponent */
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#define DECIMAL128_Bias 6176 /* bias for the exponent */
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#define DECIMAL128_String 43 /* maximum string length, +1 */
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/* highest biased exponent (Elimit-1) */
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#define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1)
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#ifndef DECNUMDIGITS
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#define DECNUMDIGITS DECIMAL128_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 128-bit type, accessible by bytes */
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typedef struct
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{
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uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits */
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} decimal128;
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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 decimal128 fields. These assume the argument
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is a reference (pointer) to the decimal128 structure */
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/* Get sign */
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#define decimal128Sign(d) ((unsigned)(d)->bytes[0]>>7)
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/* Get combination field */
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#define decimal128Comb(d) (((d)->bytes[0] & 0x7c)>>2)
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/* Get exponent continuation [does not remove bias] */
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#define decimal128ExpCon(d) ((((d)->bytes[0] & 0x03)<<10) \
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| ((unsigned)(d)->bytes[1]<<2) \
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| ((unsigned)(d)->bytes[2]>>6))
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/* Set sign [this assumes sign previously 0] */
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#define decimal128SetSign(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; */
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/* type of exponent must be unsigned */
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#define decimal128SetExpCon(d, e) { \
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(d)->bytes[0]|=(uint8_t)((e)>>10); \
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(d)->bytes[1] =(uint8_t)(((e)&0x3fc)>>2); \
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(d)->bytes[2]|=(uint8_t)(((e)&0x03)<<6);}
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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 decimal128FromString __decimal128FromString
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#define decimal128ToString __decimal128ToString
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#define decimal128ToEngString __decimal128ToEngString
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#define decimal128FromNumber __decimal128FromNumber
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#define decimal128ToNumber __decimal128ToNumber
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#endif
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/* String conversions */
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decimal128 *decimal128FromString (decimal128 *, const char *, decContext *);
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char *decimal128ToString (const decimal128 *, char *);
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char *decimal128ToEngString (const decimal128 *, char *);
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/* decNumber conversions */
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decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *);
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decNumber *decimal128ToNumber (const decimal128 *, decNumber *);
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#endif
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