1/* Decimal 128-bit format module header for the decNumber C Library.
2 Copyright (C) 2005-2017 Free Software Foundation, Inc.
3 Contributed by IBM Corporation. Author Mike Cowlishaw.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17Under Section 7 of GPL version 3, you are granted additional
18permissions described in the GCC Runtime Library Exception, version
193.1, as published by the Free Software Foundation.
20
21You should have received a copy of the GNU General Public License and
22a copy of the GCC Runtime Library Exception along with this program;
23see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24<http://www.gnu.org/licenses/>. */
25
26/* ------------------------------------------------------------------ */
27/* Decimal 128-bit format module header */
28/* ------------------------------------------------------------------ */
29
30#if !defined(DECIMAL128)
31 #define DECIMAL128
32 #define DEC128NAME "decimal128" /* Short name */
33 #define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */
34 #define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */
35
36 /* parameters for decimal128s */
37 #define DECIMAL128_Bytes 16 /* length */
38 #define DECIMAL128_Pmax 34 /* maximum precision (digits) */
39 #define DECIMAL128_Emax 6144 /* maximum adjusted exponent */
40 #define DECIMAL128_Emin -6143 /* minimum adjusted exponent */
41 #define DECIMAL128_Bias 6176 /* bias for the exponent */
42 #define DECIMAL128_String 43 /* maximum string length, +1 */
43 #define DECIMAL128_EconL 12 /* exp. continuation length */
44 /* highest biased exponent (Elimit-1) */
45 #define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1)
46
47 /* check enough digits, if pre-defined */
48 #if defined(DECNUMDIGITS)
49 #if (DECNUMDIGITS<DECIMAL128_Pmax)
50 #error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use
51 #endif
52 #endif
53
54 #ifndef DECNUMDIGITS
55 #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/
56 #endif
57 #ifndef DECNUMBER
58 #include "decNumber.h" /* context and number library */
59 #endif
60
61 /* Decimal 128-bit type, accessible by bytes */
62 typedef struct {
63 uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/
64 } decimal128;
65
66 /* special values [top byte excluding sign bit; last two bits are */
67 /* don't-care for Infinity on input, last bit don't-care for NaN] */
68 #if !defined(DECIMAL_NaN)
69 #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */
70 #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */
71 #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */
72 #endif
73
74#include "decimal128Local.h"
75
76 /* ---------------------------------------------------------------- */
77 /* Routines */
78 /* ---------------------------------------------------------------- */
79
80#include "decimal128Symbols.h"
81
82 #ifdef __cplusplus
83 extern "C" {
84 #endif
85
86 /* String conversions */
87 decimal128 * decimal128FromString(decimal128 *, const char *, decContext *);
88 char * decimal128ToString(const decimal128 *, char *);
89 char * decimal128ToEngString(const decimal128 *, char *);
90
91 /* decNumber conversions */
92 decimal128 * decimal128FromNumber(decimal128 *, const decNumber *,
93 decContext *);
94 decNumber * decimal128ToNumber(const decimal128 *, decNumber *);
95
96 /* Format-dependent utilities */
97 uint32_t decimal128IsCanonical(const decimal128 *);
98 decimal128 * decimal128Canonical(decimal128 *, const decimal128 *);
99
100 #ifdef __cplusplus
101 }
102 #endif
103
104#endif
105