Mercurial > hg > CbC > CbC_gcc
annotate libdecnumber/decContext.c @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
children |
rev | line source |
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0 | 1 /* Decimal context module for the decNumber C Library. |
145 | 2 Copyright (C) 2005-2020 Free Software Foundation, Inc. |
0 | 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 | |
17 Under Section 7 of GPL version 3, you are granted additional | |
18 permissions described in the GCC Runtime Library Exception, version | |
19 3.1, as published by the Free Software Foundation. | |
20 | |
21 You should have received a copy of the GNU General Public License and | |
22 a copy of the GCC Runtime Library Exception along with this program; | |
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 <http://www.gnu.org/licenses/>. */ | |
25 | |
26 /* ------------------------------------------------------------------ */ | |
27 /* Decimal Context module */ | |
28 /* ------------------------------------------------------------------ */ | |
29 /* This module comprises the routines for handling arithmetic */ | |
30 /* context structures. */ | |
31 /* ------------------------------------------------------------------ */ | |
32 | |
33 #include <string.h> /* for strcmp */ | |
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34 #ifdef DECCHECK |
0 | 35 #include <stdio.h> /* for printf if DECCHECK */ |
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36 #endif |
0 | 37 #include "dconfig.h" /* for GCC definitions */ |
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38 #include "decContext.h" /* context and base types */ |
0 | 39 #include "decNumberLocal.h" /* decNumber local types, etc. */ |
40 | |
41 /* compile-time endian tester [assumes sizeof(Int)>1] */ | |
42 static const Int mfcone=1; /* constant 1 */ | |
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43 static const Flag *mfctop=(const Flag *)&mfcone; /* -> top byte */ |
0 | 44 #define LITEND *mfctop /* named flag; 1=little-endian */ |
45 | |
46 /* ------------------------------------------------------------------ */ | |
47 /* round-for-reround digits */ | |
48 /* ------------------------------------------------------------------ */ | |
49 const uByte DECSTICKYTAB[10]={1,1,2,3,4,6,6,7,8,9}; /* used if sticky */ | |
50 | |
51 /* ------------------------------------------------------------------ */ | |
52 /* Powers of ten (powers[n]==10**n, 0<=n<=9) */ | |
53 /* ------------------------------------------------------------------ */ | |
54 const uInt DECPOWERS[10]={1, 10, 100, 1000, 10000, 100000, 1000000, | |
55 10000000, 100000000, 1000000000}; | |
56 | |
57 /* ------------------------------------------------------------------ */ | |
58 /* decContextClearStatus -- clear bits in current status */ | |
59 /* */ | |
60 /* context is the context structure to be queried */ | |
61 /* mask indicates the bits to be cleared (the status bit that */ | |
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62 /* corresponds to each 1 bit in the mask is cleared) */ |
0 | 63 /* returns context */ |
64 /* */ | |
65 /* No error is possible. */ | |
66 /* ------------------------------------------------------------------ */ | |
67 decContext *decContextClearStatus(decContext *context, uInt mask) { | |
68 context->status&=~mask; | |
69 return context; | |
70 } /* decContextClearStatus */ | |
71 | |
72 /* ------------------------------------------------------------------ */ | |
73 /* decContextDefault -- initialize a context structure */ | |
74 /* */ | |
75 /* context is the structure to be initialized */ | |
76 /* kind selects the required set of default values, one of: */ | |
77 /* DEC_INIT_BASE -- select ANSI X3-274 defaults */ | |
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78 /* DEC_INIT_DECIMAL32 -- select IEEE 754 defaults, 32-bit */ |
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79 /* DEC_INIT_DECIMAL64 -- select IEEE 754 defaults, 64-bit */ |
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80 /* DEC_INIT_DECIMAL128 -- select IEEE 754 defaults, 128-bit */ |
0 | 81 /* For any other value a valid context is returned, but with */ |
82 /* Invalid_operation set in the status field. */ | |
83 /* returns a context structure with the appropriate initial values. */ | |
84 /* ------------------------------------------------------------------ */ | |
85 decContext * decContextDefault(decContext *context, Int kind) { | |
86 /* set defaults... */ | |
87 context->digits=9; /* 9 digits */ | |
88 context->emax=DEC_MAX_EMAX; /* 9-digit exponents */ | |
89 context->emin=DEC_MIN_EMIN; /* .. balanced */ | |
90 context->round=DEC_ROUND_HALF_UP; /* 0.5 rises */ | |
91 context->traps=DEC_Errors; /* all but informational */ | |
92 context->status=0; /* cleared */ | |
93 context->clamp=0; /* no clamping */ | |
94 #if DECSUBSET | |
95 context->extended=0; /* cleared */ | |
96 #endif | |
97 switch (kind) { | |
98 case DEC_INIT_BASE: | |
99 /* [use defaults] */ | |
100 break; | |
101 case DEC_INIT_DECIMAL32: | |
102 context->digits=7; /* digits */ | |
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103 context->emax=96; /* Emax */ |
0 | 104 context->emin=-95; /* Emin */ |
105 context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */ | |
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106 context->traps=0; /* no traps set */ |
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107 context->clamp=1; /* clamp exponents */ |
0 | 108 #if DECSUBSET |
109 context->extended=1; /* set */ | |
110 #endif | |
111 break; | |
112 case DEC_INIT_DECIMAL64: | |
113 context->digits=16; /* digits */ | |
114 context->emax=384; /* Emax */ | |
115 context->emin=-383; /* Emin */ | |
116 context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */ | |
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117 context->traps=0; /* no traps set */ |
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118 context->clamp=1; /* clamp exponents */ |
0 | 119 #if DECSUBSET |
120 context->extended=1; /* set */ | |
121 #endif | |
122 break; | |
123 case DEC_INIT_DECIMAL128: | |
124 context->digits=34; /* digits */ | |
125 context->emax=6144; /* Emax */ | |
126 context->emin=-6143; /* Emin */ | |
127 context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */ | |
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128 context->traps=0; /* no traps set */ |
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129 context->clamp=1; /* clamp exponents */ |
0 | 130 #if DECSUBSET |
131 context->extended=1; /* set */ | |
132 #endif | |
133 break; | |
134 | |
135 default: /* invalid Kind */ | |
136 /* use defaults, and .. */ | |
137 decContextSetStatus(context, DEC_Invalid_operation); /* trap */ | |
138 } | |
139 | |
140 return context;} /* decContextDefault */ | |
141 | |
142 /* ------------------------------------------------------------------ */ | |
143 /* decContextGetRounding -- return current rounding mode */ | |
144 /* */ | |
145 /* context is the context structure to be queried */ | |
146 /* returns the rounding mode */ | |
147 /* */ | |
148 /* No error is possible. */ | |
149 /* ------------------------------------------------------------------ */ | |
150 enum rounding decContextGetRounding(decContext *context) { | |
151 return context->round; | |
152 } /* decContextGetRounding */ | |
153 | |
154 /* ------------------------------------------------------------------ */ | |
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155 /* decContextGetStatus -- return current status */ |
0 | 156 /* */ |
157 /* context is the context structure to be queried */ | |
158 /* returns status */ | |
159 /* */ | |
160 /* No error is possible. */ | |
161 /* ------------------------------------------------------------------ */ | |
162 uInt decContextGetStatus(decContext *context) { | |
163 return context->status; | |
164 } /* decContextGetStatus */ | |
165 | |
166 /* ------------------------------------------------------------------ */ | |
167 /* decContextRestoreStatus -- restore bits in current status */ | |
168 /* */ | |
169 /* context is the context structure to be updated */ | |
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170 /* newstatus is the source for the bits to be restored */ |
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171 /* mask indicates the bits to be restored (the status bit that */ |
0 | 172 /* corresponds to each 1 bit in the mask is set to the value of */ |
173 /* the correspnding bit in newstatus) */ | |
174 /* returns context */ | |
175 /* */ | |
176 /* No error is possible. */ | |
177 /* ------------------------------------------------------------------ */ | |
178 decContext *decContextRestoreStatus(decContext *context, | |
179 uInt newstatus, uInt mask) { | |
180 context->status&=~mask; /* clear the selected bits */ | |
181 context->status|=(mask&newstatus); /* or in the new bits */ | |
182 return context; | |
183 } /* decContextRestoreStatus */ | |
184 | |
185 /* ------------------------------------------------------------------ */ | |
186 /* decContextSaveStatus -- save bits in current status */ | |
187 /* */ | |
188 /* context is the context structure to be queried */ | |
189 /* mask indicates the bits to be saved (the status bits that */ | |
190 /* correspond to each 1 bit in the mask are saved) */ | |
191 /* returns the AND of the mask and the current status */ | |
192 /* */ | |
193 /* No error is possible. */ | |
194 /* ------------------------------------------------------------------ */ | |
195 uInt decContextSaveStatus(decContext *context, uInt mask) { | |
196 return context->status&mask; | |
197 } /* decContextSaveStatus */ | |
198 | |
199 /* ------------------------------------------------------------------ */ | |
200 /* decContextSetRounding -- set current rounding mode */ | |
201 /* */ | |
202 /* context is the context structure to be updated */ | |
203 /* newround is the value which will replace the current mode */ | |
204 /* returns context */ | |
205 /* */ | |
206 /* No error is possible. */ | |
207 /* ------------------------------------------------------------------ */ | |
208 decContext *decContextSetRounding(decContext *context, | |
209 enum rounding newround) { | |
210 context->round=newround; | |
211 return context; | |
212 } /* decContextSetRounding */ | |
213 | |
214 /* ------------------------------------------------------------------ */ | |
215 /* decContextSetStatus -- set status and raise trap if appropriate */ | |
216 /* */ | |
217 /* context is the context structure to be updated */ | |
218 /* status is the DEC_ exception code */ | |
219 /* returns the context structure */ | |
220 /* */ | |
221 /* Control may never return from this routine, if there is a signal */ | |
222 /* handler and it takes a long jump. */ | |
223 /* ------------------------------------------------------------------ */ | |
224 decContext * decContextSetStatus(decContext *context, uInt status) { | |
225 context->status|=status; | |
226 if (status & context->traps) raise(SIGFPE); | |
227 return context;} /* decContextSetStatus */ | |
228 | |
229 /* ------------------------------------------------------------------ */ | |
230 /* decContextSetStatusFromString -- set status from a string + trap */ | |
231 /* */ | |
232 /* context is the context structure to be updated */ | |
233 /* string is a string exactly equal to one that might be returned */ | |
234 /* by decContextStatusToString */ | |
235 /* */ | |
236 /* The status bit corresponding to the string is set, and a trap */ | |
237 /* is raised if appropriate. */ | |
238 /* */ | |
239 /* returns the context structure, unless the string is equal to */ | |
240 /* DEC_Condition_MU or is not recognized. In these cases NULL is */ | |
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241 /* returned. */ |
0 | 242 /* ------------------------------------------------------------------ */ |
243 decContext * decContextSetStatusFromString(decContext *context, | |
244 const char *string) { | |
245 if (strcmp(string, DEC_Condition_CS)==0) | |
246 return decContextSetStatus(context, DEC_Conversion_syntax); | |
247 if (strcmp(string, DEC_Condition_DZ)==0) | |
248 return decContextSetStatus(context, DEC_Division_by_zero); | |
249 if (strcmp(string, DEC_Condition_DI)==0) | |
250 return decContextSetStatus(context, DEC_Division_impossible); | |
251 if (strcmp(string, DEC_Condition_DU)==0) | |
252 return decContextSetStatus(context, DEC_Division_undefined); | |
253 if (strcmp(string, DEC_Condition_IE)==0) | |
254 return decContextSetStatus(context, DEC_Inexact); | |
255 if (strcmp(string, DEC_Condition_IS)==0) | |
256 return decContextSetStatus(context, DEC_Insufficient_storage); | |
257 if (strcmp(string, DEC_Condition_IC)==0) | |
258 return decContextSetStatus(context, DEC_Invalid_context); | |
259 if (strcmp(string, DEC_Condition_IO)==0) | |
260 return decContextSetStatus(context, DEC_Invalid_operation); | |
261 #if DECSUBSET | |
262 if (strcmp(string, DEC_Condition_LD)==0) | |
263 return decContextSetStatus(context, DEC_Lost_digits); | |
264 #endif | |
265 if (strcmp(string, DEC_Condition_OV)==0) | |
266 return decContextSetStatus(context, DEC_Overflow); | |
267 if (strcmp(string, DEC_Condition_PA)==0) | |
268 return decContextSetStatus(context, DEC_Clamped); | |
269 if (strcmp(string, DEC_Condition_RO)==0) | |
270 return decContextSetStatus(context, DEC_Rounded); | |
271 if (strcmp(string, DEC_Condition_SU)==0) | |
272 return decContextSetStatus(context, DEC_Subnormal); | |
273 if (strcmp(string, DEC_Condition_UN)==0) | |
274 return decContextSetStatus(context, DEC_Underflow); | |
275 if (strcmp(string, DEC_Condition_ZE)==0) | |
276 return context; | |
277 return NULL; /* Multiple status, or unknown */ | |
278 } /* decContextSetStatusFromString */ | |
279 | |
280 /* ------------------------------------------------------------------ */ | |
281 /* decContextSetStatusFromStringQuiet -- set status from a string */ | |
282 /* */ | |
283 /* context is the context structure to be updated */ | |
284 /* string is a string exactly equal to one that might be returned */ | |
285 /* by decContextStatusToString */ | |
286 /* */ | |
287 /* The status bit corresponding to the string is set; no trap is */ | |
288 /* raised. */ | |
289 /* */ | |
290 /* returns the context structure, unless the string is equal to */ | |
291 /* DEC_Condition_MU or is not recognized. In these cases NULL is */ | |
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292 /* returned. */ |
0 | 293 /* ------------------------------------------------------------------ */ |
294 decContext * decContextSetStatusFromStringQuiet(decContext *context, | |
295 const char *string) { | |
296 if (strcmp(string, DEC_Condition_CS)==0) | |
297 return decContextSetStatusQuiet(context, DEC_Conversion_syntax); | |
298 if (strcmp(string, DEC_Condition_DZ)==0) | |
299 return decContextSetStatusQuiet(context, DEC_Division_by_zero); | |
300 if (strcmp(string, DEC_Condition_DI)==0) | |
301 return decContextSetStatusQuiet(context, DEC_Division_impossible); | |
302 if (strcmp(string, DEC_Condition_DU)==0) | |
303 return decContextSetStatusQuiet(context, DEC_Division_undefined); | |
304 if (strcmp(string, DEC_Condition_IE)==0) | |
305 return decContextSetStatusQuiet(context, DEC_Inexact); | |
306 if (strcmp(string, DEC_Condition_IS)==0) | |
307 return decContextSetStatusQuiet(context, DEC_Insufficient_storage); | |
308 if (strcmp(string, DEC_Condition_IC)==0) | |
309 return decContextSetStatusQuiet(context, DEC_Invalid_context); | |
310 if (strcmp(string, DEC_Condition_IO)==0) | |
311 return decContextSetStatusQuiet(context, DEC_Invalid_operation); | |
312 #if DECSUBSET | |
313 if (strcmp(string, DEC_Condition_LD)==0) | |
314 return decContextSetStatusQuiet(context, DEC_Lost_digits); | |
315 #endif | |
316 if (strcmp(string, DEC_Condition_OV)==0) | |
317 return decContextSetStatusQuiet(context, DEC_Overflow); | |
318 if (strcmp(string, DEC_Condition_PA)==0) | |
319 return decContextSetStatusQuiet(context, DEC_Clamped); | |
320 if (strcmp(string, DEC_Condition_RO)==0) | |
321 return decContextSetStatusQuiet(context, DEC_Rounded); | |
322 if (strcmp(string, DEC_Condition_SU)==0) | |
323 return decContextSetStatusQuiet(context, DEC_Subnormal); | |
324 if (strcmp(string, DEC_Condition_UN)==0) | |
325 return decContextSetStatusQuiet(context, DEC_Underflow); | |
326 if (strcmp(string, DEC_Condition_ZE)==0) | |
327 return context; | |
328 return NULL; /* Multiple status, or unknown */ | |
329 } /* decContextSetStatusFromStringQuiet */ | |
330 | |
331 /* ------------------------------------------------------------------ */ | |
332 /* decContextSetStatusQuiet -- set status without trap */ | |
333 /* */ | |
334 /* context is the context structure to be updated */ | |
335 /* status is the DEC_ exception code */ | |
336 /* returns the context structure */ | |
337 /* */ | |
338 /* No error is possible. */ | |
339 /* ------------------------------------------------------------------ */ | |
340 decContext * decContextSetStatusQuiet(decContext *context, uInt status) { | |
341 context->status|=status; | |
342 return context;} /* decContextSetStatusQuiet */ | |
343 | |
344 /* ------------------------------------------------------------------ */ | |
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345 /* decContextStatusToString -- convert status flags to a string */ |
0 | 346 /* */ |
347 /* context is a context with valid status field */ | |
348 /* */ | |
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349 /* returns a constant string describing the condition. If multiple */ |
0 | 350 /* (or no) flags are set, a generic constant message is returned. */ |
351 /* ------------------------------------------------------------------ */ | |
352 const char *decContextStatusToString(const decContext *context) { | |
353 Int status=context->status; | |
354 | |
355 /* test the five IEEE first, as some of the others are ambiguous when */ | |
356 /* DECEXTFLAG=0 */ | |
357 if (status==DEC_Invalid_operation ) return DEC_Condition_IO; | |
358 if (status==DEC_Division_by_zero ) return DEC_Condition_DZ; | |
359 if (status==DEC_Overflow ) return DEC_Condition_OV; | |
360 if (status==DEC_Underflow ) return DEC_Condition_UN; | |
361 if (status==DEC_Inexact ) return DEC_Condition_IE; | |
362 | |
363 if (status==DEC_Division_impossible ) return DEC_Condition_DI; | |
364 if (status==DEC_Division_undefined ) return DEC_Condition_DU; | |
365 if (status==DEC_Rounded ) return DEC_Condition_RO; | |
366 if (status==DEC_Clamped ) return DEC_Condition_PA; | |
367 if (status==DEC_Subnormal ) return DEC_Condition_SU; | |
368 if (status==DEC_Conversion_syntax ) return DEC_Condition_CS; | |
369 if (status==DEC_Insufficient_storage ) return DEC_Condition_IS; | |
370 if (status==DEC_Invalid_context ) return DEC_Condition_IC; | |
371 #if DECSUBSET | |
372 if (status==DEC_Lost_digits ) return DEC_Condition_LD; | |
373 #endif | |
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374 if (status==0 ) return DEC_Condition_ZE; |
0 | 375 return DEC_Condition_MU; /* Multiple errors */ |
376 } /* decContextStatusToString */ | |
377 | |
378 /* ------------------------------------------------------------------ */ | |
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379 /* decContextTestEndian -- test whether DECLITEND is set correctly */ |
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380 /* */ |
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381 /* quiet is 1 to suppress message; 0 otherwise */ |
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382 /* returns 0 if DECLITEND is correct */ |
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383 /* 1 if DECLITEND is incorrect and should be 1 */ |
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384 /* -1 if DECLITEND is incorrect and should be 0 */ |
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385 /* */ |
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386 /* A message is displayed if the return value is not 0 and quiet==0. */ |
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387 /* */ |
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388 /* No error is possible. */ |
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389 /* ------------------------------------------------------------------ */ |
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390 Int decContextTestEndian(Flag quiet) { |
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391 Int res=0; /* optimist */ |
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392 uInt dle=(uInt)DECLITEND; /* unsign */ |
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393 if (dle>1) dle=1; /* ensure 0 or 1 */ |
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394 |
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395 if (LITEND!=DECLITEND) { |
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396 if (!quiet) { |
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397 #if DECCHECK |
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398 const char *adj; |
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399 if (LITEND) adj="little"; |
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400 else adj="big"; |
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401 printf("Warning: DECLITEND is set to %d, but this computer appears to be %s-endian\n", |
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402 DECLITEND, adj); |
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403 #endif |
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404 } |
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405 res=(Int)LITEND-dle; |
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406 } |
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407 return res; |
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408 } /* decContextTestEndian */ |
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409 |
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410 /* ------------------------------------------------------------------ */ |
0 | 411 /* decContextTestSavedStatus -- test bits in saved status */ |
412 /* */ | |
413 /* oldstatus is the status word to be tested */ | |
414 /* mask indicates the bits to be tested (the oldstatus bits that */ | |
415 /* correspond to each 1 bit in the mask are tested) */ | |
416 /* returns 1 if any of the tested bits are 1, or 0 otherwise */ | |
417 /* */ | |
418 /* No error is possible. */ | |
419 /* ------------------------------------------------------------------ */ | |
420 uInt decContextTestSavedStatus(uInt oldstatus, uInt mask) { | |
421 return (oldstatus&mask)!=0; | |
422 } /* decContextTestSavedStatus */ | |
423 | |
424 /* ------------------------------------------------------------------ */ | |
425 /* decContextTestStatus -- test bits in current status */ | |
426 /* */ | |
427 /* context is the context structure to be updated */ | |
428 /* mask indicates the bits to be tested (the status bits that */ | |
429 /* correspond to each 1 bit in the mask are tested) */ | |
430 /* returns 1 if any of the tested bits are 1, or 0 otherwise */ | |
431 /* */ | |
432 /* No error is possible. */ | |
433 /* ------------------------------------------------------------------ */ | |
434 uInt decContextTestStatus(decContext *context, uInt mask) { | |
435 return (context->status&mask)!=0; | |
436 } /* decContextTestStatus */ | |
437 | |
438 /* ------------------------------------------------------------------ */ | |
439 /* decContextZeroStatus -- clear all status bits */ | |
440 /* */ | |
441 /* context is the context structure to be updated */ | |
442 /* returns context */ | |
443 /* */ | |
444 /* No error is possible. */ | |
445 /* ------------------------------------------------------------------ */ | |
446 decContext *decContextZeroStatus(decContext *context) { | |
447 context->status=0; | |
448 return context; | |
449 } /* decContextZeroStatus */ | |
450 |