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Diffstat (limited to 'libdecnumber/dpd/decimal128.h')
| -rw-r--r-- | libdecnumber/dpd/decimal128.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libdecnumber/dpd/decimal128.h b/libdecnumber/dpd/decimal128.h new file mode 100644 index 00000000000..a6bc87bb4a3 --- /dev/null +++ b/libdecnumber/dpd/decimal128.h @@ -0,0 +1,130 @@ +/* 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 |