| /* 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);} |
| |
| /* 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 |
| #define decimal128FromString __decimal128FromString |
| #define decimal128ToString __decimal128ToString |
| #define decimal128ToEngString __decimal128ToEngString |
| #define decimal128FromNumber __decimal128FromNumber |
| #define decimal128ToNumber __decimal128ToNumber |
| #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 |