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1 | /* Decimal 128-bit format module header for the decNumber C Library |
2 | Copyright (C) 2005 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 2, or (at your option) any later | |
10 | version. | |
11 | ||
9d1d1cd4 BE |
12 | In addition to the permissions in the GNU General Public License, |
13 | the Free Software Foundation gives you unlimited permission to link | |
14 | the compiled version of this file into combinations with other | |
15 | programs, and to distribute those combinations without any | |
16 | restriction coming from the use of this file. (The General Public | |
17 | License restrictions do apply in other respects; for example, they | |
18 | cover modification of the file, and distribution when not linked | |
19 | into a combine executable.) | |
20 | ||
473a74b9 BE |
21 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
22 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
23 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
24 | for more details. | |
25 | ||
26 | You should have received a copy of the GNU General Public License | |
27 | along with GCC; see the file COPYING. If not, write to the Free | |
c0173136 BE |
28 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
29 | 02110-1301, USA. */ | |
473a74b9 BE |
30 | |
31 | #if !defined(DECIMAL128) | |
32 | #define DECIMAL128 | |
33 | #define DEC128NAME "decimal128" /* Short name */ | |
34 | #define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */ | |
35 | #define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */ | |
36 | ||
37 | #if defined(DECIMAL32) | |
38 | #error decimal128.h must precede decimal32.h for correct DECNUMDIGITS | |
39 | #else | |
40 | #if defined(DECIMAL64) | |
41 | #error decimal128.h must precede decimal64.h for correct DECNUMDIGITS | |
42 | #endif | |
43 | #endif | |
44 | ||
45 | /* parameters for decimal128s */ | |
46 | #define DECIMAL128_Bytes 16 /* length */ | |
47 | #define DECIMAL128_Pmax 34 /* maximum precision (digits) */ | |
48 | #define DECIMAL128_Emax 6144 /* maximum adjusted exponent */ | |
49 | #define DECIMAL128_Emin -6143 /* minimum adjusted exponent */ | |
50 | #define DECIMAL128_Bias 6176 /* bias for the exponent */ | |
51 | #define DECIMAL128_String 43 /* maximum string length, +1 */ | |
52 | /* highest biased exponent (Elimit-1) */ | |
53 | #define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1) | |
54 | ||
55 | #ifndef DECNUMDIGITS | |
56 | #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined */ | |
57 | #endif | |
58 | #ifndef DECNUMBER | |
59 | #include "decNumber.h" /* context and number library */ | |
60 | #endif | |
61 | ||
62 | /* Decimal 128-bit type, accessible by bytes */ | |
63 | typedef struct | |
64 | { | |
65 | uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits */ | |
66 | } decimal128; | |
67 | ||
68 | /* special values [top byte excluding sign bit; last two bits are | |
69 | don't-care for Infinity on input, last bit don't-care for NaN] */ | |
70 | #if !defined(DECIMAL_NaN) | |
71 | #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ | |
72 | #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ | |
73 | #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ | |
74 | #endif | |
75 | ||
76 | /* Macros for accessing decimal128 fields. These assume the argument | |
77 | is a reference (pointer) to the decimal128 structure */ | |
78 | /* Get sign */ | |
79 | #define decimal128Sign(d) ((unsigned)(d)->bytes[0]>>7) | |
80 | ||
81 | /* Get combination field */ | |
82 | #define decimal128Comb(d) (((d)->bytes[0] & 0x7c)>>2) | |
83 | ||
84 | /* Get exponent continuation [does not remove bias] */ | |
85 | #define decimal128ExpCon(d) ((((d)->bytes[0] & 0x03)<<10) \ | |
86 | | ((unsigned)(d)->bytes[1]<<2) \ | |
87 | | ((unsigned)(d)->bytes[2]>>6)) | |
88 | ||
89 | /* Set sign [this assumes sign previously 0] */ | |
90 | #define decimal128SetSign(d, b) { \ | |
91 | (d)->bytes[0]|=((unsigned)(b)<<7);} | |
92 | ||
79b87c74 MM |
93 | /* Clear sign */ |
94 | #define decimal128ClearSign(d) {(d)->bytes[0]&=~0x80;} | |
95 | ||
96 | /* Flip sign */ | |
97 | #define decimal128FlipSign(d) {(d)->bytes[0]^=0x80;} | |
98 | ||
473a74b9 BE |
99 | /* Set exponent continuation [does not apply bias] */ |
100 | /* This assumes range has been checked and exponent previously 0; */ | |
101 | /* type of exponent must be unsigned */ | |
102 | #define decimal128SetExpCon(d, e) { \ | |
103 | (d)->bytes[0]|=(uint8_t)((e)>>10); \ | |
104 | (d)->bytes[1] =(uint8_t)(((e)&0x3fc)>>2); \ | |
105 | (d)->bytes[2]|=(uint8_t)(((e)&0x03)<<6);} | |
106 | ||
107 | /* ------------------------------------------------------------------ */ | |
108 | /* Routines */ | |
109 | /* ------------------------------------------------------------------ */ | |
110 | ||
111 | #ifdef IN_LIBGCC2 | |
79b87c74 | 112 | #ifndef decimal128FromString |
473a74b9 BE |
113 | #define decimal128FromString __decimal128FromString |
114 | #define decimal128ToString __decimal128ToString | |
115 | #define decimal128ToEngString __decimal128ToEngString | |
116 | #define decimal128FromNumber __decimal128FromNumber | |
117 | #define decimal128ToNumber __decimal128ToNumber | |
79b87c74 | 118 | #endif |
473a74b9 BE |
119 | #endif |
120 | ||
121 | /* String conversions */ | |
c5d43417 | 122 | decimal128 *decimal128FromString (decimal128 *, const char *, decContext *); |
aa4f41c1 KG |
123 | char *decimal128ToString (const decimal128 *, char *); |
124 | char *decimal128ToEngString (const decimal128 *, char *); | |
473a74b9 BE |
125 | |
126 | /* decNumber conversions */ | |
aa4f41c1 KG |
127 | decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *); |
128 | decNumber *decimal128ToNumber (const decimal128 *, decNumber *); | |
473a74b9 BE |
129 | |
130 | #endif |