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1 | /* Decimal context header module for the decNumber C Library. |
2 | Copyright (C) 2005, 2007 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 | 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 | ||
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 | |
28 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA | |
29 | 02110-1301, USA. */ | |
30 | ||
31 | /* ------------------------------------------------------------------ */ | |
32 | /* Decimal Context module header */ | |
33 | /* ------------------------------------------------------------------ */ | |
34 | /* */ | |
35 | /* Context variables must always have valid values: */ | |
36 | /* */ | |
37 | /* status -- [any bits may be cleared, but not set, by user] */ | |
38 | /* round -- must be one of the enumerated rounding modes */ | |
39 | /* */ | |
40 | /* The following variables are implied for fixed size formats (i.e., */ | |
41 | /* they are ignored) but should still be set correctly in case used */ | |
42 | /* with decNumber functions: */ | |
43 | /* */ | |
44 | /* clamp -- must be either 0 or 1 */ | |
45 | /* digits -- must be in the range 1 through 999999999 */ | |
46 | /* emax -- must be in the range 0 through 999999999 */ | |
47 | /* emin -- must be in the range 0 through -999999999 */ | |
48 | /* extended -- must be either 0 or 1 [present only if DECSUBSET] */ | |
49 | /* traps -- only defined bits may be set */ | |
50 | /* */ | |
51 | /* ------------------------------------------------------------------ */ | |
52 | ||
53 | #if !defined(DECCONTEXT) | |
54 | #define DECCONTEXT | |
55 | #define DECCNAME "decContext" /* Short name */ | |
56 | #define DECCFULLNAME "Decimal Context Descriptor" /* Verbose name */ | |
57 | #define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */ | |
58 | ||
59 | #include "gstdint.h" /* C99 standard integers */ | |
60 | #include <stdio.h> /* for printf, etc. */ | |
61 | #include <signal.h> /* for traps */ | |
62 | ||
63 | /* Extended flags setting -- set this to 0 to use only IEEE flags */ | |
64 | #define DECEXTFLAG 1 /* 1=enable extended flags */ | |
65 | ||
66 | /* Conditional code flag -- set this to 0 for best performance */ | |
67 | #define DECSUBSET 0 /* 1=enable subset arithmetic */ | |
68 | ||
69 | /* Context for operations, with associated constants */ | |
70 | enum rounding { | |
71 | DEC_ROUND_CEILING, /* round towards +infinity */ | |
72 | DEC_ROUND_UP, /* round away from 0 */ | |
73 | DEC_ROUND_HALF_UP, /* 0.5 rounds up */ | |
74 | DEC_ROUND_HALF_EVEN, /* 0.5 rounds to nearest even */ | |
75 | DEC_ROUND_HALF_DOWN, /* 0.5 rounds down */ | |
76 | DEC_ROUND_DOWN, /* round towards 0 (truncate) */ | |
77 | DEC_ROUND_FLOOR, /* round towards -infinity */ | |
78 | DEC_ROUND_05UP, /* round for reround */ | |
79 | DEC_ROUND_MAX /* enum must be less than this */ | |
80 | }; | |
81 | #define DEC_ROUND_DEFAULT DEC_ROUND_HALF_EVEN; | |
82 | ||
83 | typedef struct { | |
84 | int32_t digits; /* working precision */ | |
85 | int32_t emax; /* maximum positive exponent */ | |
86 | int32_t emin; /* minimum negative exponent */ | |
87 | enum rounding round; /* rounding mode */ | |
88 | uint32_t traps; /* trap-enabler flags */ | |
89 | uint32_t status; /* status flags */ | |
90 | uint8_t clamp; /* flag: apply IEEE exponent clamp */ | |
91 | #if DECSUBSET | |
92 | uint8_t extended; /* flag: special-values allowed */ | |
93 | #endif | |
94 | } decContext; | |
95 | ||
96 | /* Maxima and Minima for context settings */ | |
97 | #define DEC_MAX_DIGITS 999999999 | |
98 | #define DEC_MIN_DIGITS 1 | |
99 | #define DEC_MAX_EMAX 999999999 | |
100 | #define DEC_MIN_EMAX 0 | |
101 | #define DEC_MAX_EMIN 0 | |
102 | #define DEC_MIN_EMIN -999999999 | |
103 | #define DEC_MAX_MATH 999999 /* max emax, etc., for math funcs. */ | |
104 | ||
105 | /* Classifications for decimal numbers, aligned with 754r (note */ | |
106 | /* that 'normal' and 'subnormal' are meaningful only with a */ | |
107 | /* decContext or a fixed size format). */ | |
108 | enum decClass { | |
109 | DEC_CLASS_SNAN, | |
110 | DEC_CLASS_QNAN, | |
111 | DEC_CLASS_NEG_INF, | |
112 | DEC_CLASS_NEG_NORMAL, | |
113 | DEC_CLASS_NEG_SUBNORMAL, | |
114 | DEC_CLASS_NEG_ZERO, | |
115 | DEC_CLASS_POS_ZERO, | |
116 | DEC_CLASS_POS_SUBNORMAL, | |
117 | DEC_CLASS_POS_NORMAL, | |
118 | DEC_CLASS_POS_INF | |
119 | }; | |
120 | /* Strings for the decClasses */ | |
121 | #define DEC_ClassString_SN "sNaN" | |
122 | #define DEC_ClassString_QN "NaN" | |
123 | #define DEC_ClassString_NI "-Infinity" | |
124 | #define DEC_ClassString_NN "-Normal" | |
125 | #define DEC_ClassString_NS "-Subnormal" | |
126 | #define DEC_ClassString_NZ "-Zero" | |
127 | #define DEC_ClassString_PZ "+Zero" | |
128 | #define DEC_ClassString_PS "+Subnormal" | |
129 | #define DEC_ClassString_PN "+Normal" | |
130 | #define DEC_ClassString_PI "+Infinity" | |
131 | #define DEC_ClassString_UN "Invalid" | |
132 | ||
133 | /* Trap-enabler and Status flags (exceptional conditions), and */ | |
134 | /* their names. The top byte is reserved for internal use */ | |
135 | #if DECEXTFLAG | |
136 | /* Extended flags */ | |
137 | #define DEC_Conversion_syntax 0x00000001 | |
138 | #define DEC_Division_by_zero 0x00000002 | |
139 | #define DEC_Division_impossible 0x00000004 | |
140 | #define DEC_Division_undefined 0x00000008 | |
141 | #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ | |
142 | #define DEC_Inexact 0x00000020 | |
143 | #define DEC_Invalid_context 0x00000040 | |
144 | #define DEC_Invalid_operation 0x00000080 | |
145 | #if DECSUBSET | |
146 | #define DEC_Lost_digits 0x00000100 | |
147 | #endif | |
148 | #define DEC_Overflow 0x00000200 | |
149 | #define DEC_Clamped 0x00000400 | |
150 | #define DEC_Rounded 0x00000800 | |
151 | #define DEC_Subnormal 0x00001000 | |
152 | #define DEC_Underflow 0x00002000 | |
153 | #else | |
154 | /* IEEE flags only */ | |
155 | #define DEC_Conversion_syntax 0x00000010 | |
156 | #define DEC_Division_by_zero 0x00000002 | |
157 | #define DEC_Division_impossible 0x00000010 | |
158 | #define DEC_Division_undefined 0x00000010 | |
159 | #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ | |
160 | #define DEC_Inexact 0x00000001 | |
161 | #define DEC_Invalid_context 0x00000010 | |
162 | #define DEC_Invalid_operation 0x00000010 | |
163 | #if DECSUBSET | |
164 | #define DEC_Lost_digits 0x00000000 | |
165 | #endif | |
166 | #define DEC_Overflow 0x00000008 | |
167 | #define DEC_Clamped 0x00000000 | |
168 | #define DEC_Rounded 0x00000000 | |
169 | #define DEC_Subnormal 0x00000000 | |
170 | #define DEC_Underflow 0x00000004 | |
171 | #endif | |
172 | ||
173 | /* IEEE 854 groupings for the flags */ | |
174 | /* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal */ | |
175 | /* are not in IEEE 854] */ | |
176 | #define DEC_IEEE_854_Division_by_zero (DEC_Division_by_zero) | |
177 | #if DECSUBSET | |
178 | #define DEC_IEEE_854_Inexact (DEC_Inexact | DEC_Lost_digits) | |
179 | #else | |
180 | #define DEC_IEEE_854_Inexact (DEC_Inexact) | |
181 | #endif | |
182 | #define DEC_IEEE_854_Invalid_operation (DEC_Conversion_syntax | \ | |
183 | DEC_Division_impossible | \ | |
184 | DEC_Division_undefined | \ | |
185 | DEC_Insufficient_storage | \ | |
186 | DEC_Invalid_context | \ | |
187 | DEC_Invalid_operation) | |
188 | #define DEC_IEEE_854_Overflow (DEC_Overflow) | |
189 | #define DEC_IEEE_854_Underflow (DEC_Underflow) | |
190 | ||
191 | /* flags which are normally errors (result is qNaN, infinite, or 0) */ | |
192 | #define DEC_Errors (DEC_IEEE_854_Division_by_zero | \ | |
193 | DEC_IEEE_854_Invalid_operation | \ | |
194 | DEC_IEEE_854_Overflow | DEC_IEEE_854_Underflow) | |
195 | /* flags which cause a result to become qNaN */ | |
196 | #define DEC_NaNs DEC_IEEE_854_Invalid_operation | |
197 | ||
198 | /* flags which are normally for information only (finite results) */ | |
199 | #if DECSUBSET | |
200 | #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact \ | |
201 | | DEC_Lost_digits) | |
202 | #else | |
203 | #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact) | |
204 | #endif | |
205 | ||
206 | /* Name strings for the exceptional conditions */ | |
207 | #define DEC_Condition_CS "Conversion syntax" | |
208 | #define DEC_Condition_DZ "Division by zero" | |
209 | #define DEC_Condition_DI "Division impossible" | |
210 | #define DEC_Condition_DU "Division undefined" | |
211 | #define DEC_Condition_IE "Inexact" | |
212 | #define DEC_Condition_IS "Insufficient storage" | |
213 | #define DEC_Condition_IC "Invalid context" | |
214 | #define DEC_Condition_IO "Invalid operation" | |
215 | #if DECSUBSET | |
216 | #define DEC_Condition_LD "Lost digits" | |
217 | #endif | |
218 | #define DEC_Condition_OV "Overflow" | |
219 | #define DEC_Condition_PA "Clamped" | |
220 | #define DEC_Condition_RO "Rounded" | |
221 | #define DEC_Condition_SU "Subnormal" | |
222 | #define DEC_Condition_UN "Underflow" | |
223 | #define DEC_Condition_ZE "No status" | |
224 | #define DEC_Condition_MU "Multiple status" | |
225 | #define DEC_Condition_Length 21 /* length of the longest string, */ | |
226 | /* including terminator */ | |
227 | ||
228 | /* Initialization descriptors, used by decContextDefault */ | |
229 | #define DEC_INIT_BASE 0 | |
230 | #define DEC_INIT_DECIMAL32 32 | |
231 | #define DEC_INIT_DECIMAL64 64 | |
232 | #define DEC_INIT_DECIMAL128 128 | |
233 | /* Synonyms */ | |
234 | #define DEC_INIT_DECSINGLE DEC_INIT_DECIMAL32 | |
235 | #define DEC_INIT_DECDOUBLE DEC_INIT_DECIMAL64 | |
236 | #define DEC_INIT_DECQUAD DEC_INIT_DECIMAL128 | |
237 | ||
238 | /* decContext routines */ | |
239 | ||
240 | #include "decContextSymbols.h" | |
241 | ||
242 | extern decContext * decContextClearStatus(decContext *, uint32_t); | |
243 | extern decContext * decContextDefault(decContext *, int32_t); | |
244 | extern enum rounding decContextGetRounding(decContext *); | |
245 | extern uint32_t decContextGetStatus(decContext *); | |
246 | extern decContext * decContextRestoreStatus(decContext *, uint32_t, uint32_t); | |
247 | extern uint32_t decContextSaveStatus(decContext *, uint32_t); | |
248 | extern decContext * decContextSetRounding(decContext *, enum rounding); | |
249 | extern decContext * decContextSetStatus(decContext *, uint32_t); | |
250 | extern decContext * decContextSetStatusFromString(decContext *, const char *); | |
251 | extern decContext * decContextSetStatusFromStringQuiet(decContext *, const char *); | |
252 | extern decContext * decContextSetStatusQuiet(decContext *, uint32_t); | |
253 | extern const char * decContextStatusToString(const decContext *); | |
254 | extern uint32_t decContextTestSavedStatus(uint32_t, uint32_t); | |
255 | extern uint32_t decContextTestStatus(decContext *, uint32_t); | |
256 | extern decContext * decContextZeroStatus(decContext *); | |
257 | ||
258 | #endif |