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1 | /* Decimal 64-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(DECIMAL64) | |
32 | #define DECIMAL64 | |
33 | #define DEC64NAME "decimal64" /* Short name */ | |
34 | #define DEC64FULLNAME "Decimal 64-bit Number" /* Verbose name */ | |
35 | #define DEC64AUTHOR "Mike Cowlishaw" /* Who to blame */ | |
36 | ||
37 | #if defined(DECIMAL32) | |
38 | #error decimal64.h must precede decimal32.h for correct DECNUMDIGITS | |
39 | #endif | |
40 | ||
41 | /* parameters for decimal64s */ | |
42 | #define DECIMAL64_Bytes 8 /* length */ | |
43 | #define DECIMAL64_Pmax 16 /* maximum precision (digits) */ | |
44 | #define DECIMAL64_Emax 384 /* maximum adjusted exponent */ | |
45 | #define DECIMAL64_Emin -383 /* minimum adjusted exponent */ | |
46 | #define DECIMAL64_Bias 398 /* bias for the exponent */ | |
47 | #define DECIMAL64_String 24 /* maximum string length, +1 */ | |
48 | /* highest biased exponent (Elimit-1) */ | |
49 | #define DECIMAL64_Ehigh (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_Pmax+1) | |
50 | ||
51 | #ifndef DECNUMDIGITS | |
52 | #define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined */ | |
53 | #endif | |
54 | #ifndef DECNUMBER | |
55 | #include "decNumber.h" /* context and number library */ | |
56 | #endif | |
57 | ||
58 | /* Decimal 64-bit type, accessible by bytes */ | |
59 | typedef struct | |
60 | { | |
61 | uint8_t bytes[DECIMAL64_Bytes]; /* decimal64: 1, 5, 8, 50 bits */ | |
62 | } decimal64; | |
63 | ||
64 | /* special values [top byte excluding sign bit; last two bits are | |
65 | don't-care for Infinity on input, last bit don't-care for NaN] */ | |
66 | #if !defined(DECIMAL_NaN) | |
67 | #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ | |
68 | #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ | |
69 | #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ | |
70 | #endif | |
71 | ||
72 | /* Macros for accessing decimal64 fields. These assume the argument | |
73 | is a reference (pointer) to the decimal64 structure */ | |
74 | /* Get sign */ | |
75 | #define decimal64Sign(d) ((unsigned)(d)->bytes[0]>>7) | |
76 | ||
77 | /* Get combination field */ | |
78 | #define decimal64Comb(d) (((d)->bytes[0] & 0x7c)>>2) | |
79 | ||
80 | /* Get exponent continuation [does not remove bias] */ | |
81 | #define decimal64ExpCon(d) ((((d)->bytes[0] & 0x03)<<6) \ | |
82 | | ((unsigned)(d)->bytes[1]>>2)) | |
83 | ||
84 | /* Set sign [this assumes sign previously 0] */ | |
85 | #define decimal64SetSign(d, b) { \ | |
86 | (d)->bytes[0]|=((unsigned)(b)<<7);} | |
87 | ||
79b87c74 MM |
88 | /* Clear sign */ |
89 | #define decimal64ClearSign(d) {(d)->bytes[0]&=~0x80;} | |
90 | ||
91 | /* Flip sign */ | |
92 | #define decimal64FlipSign(d) {(d)->bytes[0]^=0x80;} | |
93 | ||
473a74b9 BE |
94 | /* Set exponent continuation [does not apply bias] */ |
95 | /* This assumes range has been checked and exponent previously 0; type */ | |
96 | /* of exponent must be unsigned */ | |
97 | #define decimal64SetExpCon(d, e) { \ | |
98 | (d)->bytes[0]|=(uint8_t)((e)>>6); \ | |
99 | (d)->bytes[1]|=(uint8_t)(((e)&0x3F)<<2);} | |
100 | ||
101 | /* ------------------------------------------------------------------ */ | |
102 | /* Routines */ | |
103 | /* ------------------------------------------------------------------ */ | |
104 | ||
105 | #ifdef IN_LIBGCC2 | |
79b87c74 | 106 | #ifndef decimal64FromString |
473a74b9 BE |
107 | #define decimal64FromString __decimal64FromString |
108 | #define decimal64ToString __decimal64ToString | |
109 | #define decimal64ToEngString __decimal64ToEngString | |
110 | #define decimal64FromNumber __decimal64FromNumber | |
111 | #define decimal64ToNumber __decimal64ToNumber | |
79b87c74 | 112 | #endif |
473a74b9 BE |
113 | #endif |
114 | ||
115 | /* String conversions */ | |
c5d43417 | 116 | decimal64 *decimal64FromString (decimal64 *, const char *, decContext *); |
aa4f41c1 KG |
117 | char *decimal64ToString (const decimal64 *, char *); |
118 | char *decimal64ToEngString (const decimal64 *, char *); | |
473a74b9 BE |
119 | |
120 | /* decNumber conversions */ | |
aa4f41c1 KG |
121 | decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *); |
122 | decNumber *decimal64ToNumber (const decimal64 *, decNumber *); | |
473a74b9 BE |
123 | |
124 | #endif |