diff options
Diffstat (limited to 'include/libdecnumber/dpd/decimal128.h')
| -rw-r--r-- | include/libdecnumber/dpd/decimal128.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/include/libdecnumber/dpd/decimal128.h b/include/libdecnumber/dpd/decimal128.h new file mode 100644 index 000000000..aff261e55 --- /dev/null +++ b/include/libdecnumber/dpd/decimal128.h @@ -0,0 +1,99 @@ +/* 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 |