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e3f15eef | 1 | /* Decimal 32-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 | ||
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 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING. If not, write to the Free | |
84d7eab9 | 19 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
e3f15eef | 21 | |
22 | #if !defined(DECIMAL32) | |
23 | #define DECIMAL32 | |
24 | #define DEC32NAME "decimal32" /* Short name */ | |
25 | #define DEC32FULLNAME "Decimal 32-bit Number" /* Verbose name */ | |
26 | #define DEC32AUTHOR "Mike Cowlishaw" /* Who to blame */ | |
27 | ||
28 | /* parameters for decimal32s */ | |
29 | #define DECIMAL32_Bytes 4 /* length */ | |
30 | #define DECIMAL32_Pmax 7 /* maximum precision (digits) */ | |
31 | #define DECIMAL32_Emax 96 /* maximum adjusted exponent */ | |
32 | #define DECIMAL32_Emin -95 /* minimum adjusted exponent */ | |
33 | #define DECIMAL32_Bias 101 /* bias for the exponent */ | |
34 | #define DECIMAL32_String 15 /* maximum string length, +1 */ | |
35 | /* highest biased exponent (Elimit-1) */ | |
36 | #define DECIMAL32_Ehigh (DECIMAL32_Emax+DECIMAL32_Bias-DECIMAL32_Pmax+1) | |
37 | ||
38 | #ifndef DECNUMDIGITS | |
39 | #define DECNUMDIGITS DECIMAL32_Pmax /* size if not already defined */ | |
40 | #endif | |
41 | #ifndef DECNUMBER | |
42 | #include "decNumber.h" /* context and number library */ | |
43 | #endif | |
44 | ||
45 | /* Decimal 32-bit type, accessible by bytes */ | |
46 | typedef struct | |
47 | { | |
48 | uint8_t bytes[DECIMAL32_Bytes]; /* decimal32: 1, 5, 6, 20 bits */ | |
49 | } decimal32; | |
50 | ||
51 | /* special values [top byte excluding sign bit; last two bits are | |
52 | don't-care for Infinity on input, last bit don't-care for NaN] */ | |
53 | #if !defined(DECIMAL_NaN) | |
54 | #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ | |
55 | #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ | |
56 | #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ | |
57 | #endif | |
58 | ||
59 | /* Macros for accessing decimal32 fields. These assume the argument | |
60 | is a reference (pointer) to the decimal32 structure */ | |
61 | /* Get sign */ | |
62 | #define decimal32Sign(d) ((unsigned)(d)->bytes[0]>>7) | |
63 | ||
64 | /* Get combination field */ | |
65 | #define decimal32Comb(d) (((d)->bytes[0] & 0x7c)>>2) | |
66 | ||
67 | /* Get exponent continuation [does not remove bias] */ | |
68 | #define decimal32ExpCon(d) ((((d)->bytes[0] & 0x03)<<4) \ | |
69 | | ((unsigned)(d)->bytes[1]>>4)) | |
70 | ||
71 | /* Set sign [this assumes sign previously 0] */ | |
72 | #define decimal32SetSign(d, b) { \ | |
73 | (d)->bytes[0]|=((unsigned)(b)<<7);} | |
74 | ||
75 | /* Set exponent continuation [does not apply bias] */ | |
76 | /* This assumes range has been checked and exponent previously 0; */ | |
77 | /* type of exponent must be unsigned */ | |
78 | #define decimal32SetExpCon(d, e) { \ | |
79 | (d)->bytes[0]|=(uint8_t)((e)>>4); \ | |
80 | (d)->bytes[1]|=(uint8_t)(((e)&0x0F)<<4);} | |
81 | ||
82 | /* ------------------------------------------------------------------ */ | |
83 | /* Routines */ | |
84 | /* ------------------------------------------------------------------ */ | |
85 | ||
86 | #ifdef IN_LIBGCC2 | |
87 | #define decimal32FromString __decimal32FromString | |
88 | #define decimal32ToString __decimal32ToString | |
89 | #define decimal32ToEngString __decimal32ToEngString | |
90 | #define decimal32FromNumber __decimal32FromNumber | |
91 | #define decimal32ToNumber __decimal32ToNumber | |
92 | #endif | |
93 | ||
94 | /* String conversions. */ | |
95 | decimal32 *decimal32FromString (decimal32 *, char *, decContext *); | |
96 | char *decimal32ToString (decimal32 *, char *); | |
97 | char *decimal32ToEngString (decimal32 *, char *); | |
98 | ||
99 | /* decNumber conversions. */ | |
100 | decimal32 *decimal32FromNumber (decimal32 *, decNumber *, decContext *); | |
101 | decNumber *decimal32ToNumber (decimal32 *, decNumber *); | |
102 | ||
103 | #endif |