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1 | /* This is a software decimal floating point library. |
2 | Copyright (C) 2005, 2006, 2007, 2008, 2009, 2011 | |
3 | Free Software Foundation, Inc. | |
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 | /* This implements IEEE 754 decimal floating point arithmetic, but | |
27 | does not provide a mechanism for setting the rounding mode, or for | |
28 | generating or handling exceptions. Conversions between decimal | |
29 | floating point types and other types depend on C library functions. | |
30 | ||
31 | Contributed by Ben Elliston <bje@au.ibm.com>. */ | |
32 | ||
33 | #include <stdio.h> | |
34 | #include <stdlib.h> | |
35 | /* FIXME: compile with -std=gnu99 to get these from stdlib.h */ | |
36 | extern float strtof (const char *, char **); | |
37 | extern long double strtold (const char *, char **); | |
38 | #include <string.h> | |
39 | #include <limits.h> | |
40 | ||
41 | #include "dfp-bit.h" | |
42 | ||
43 | /* Forward declarations. */ | |
44 | #if WIDTH == 32 || WIDTH_TO == 32 | |
45 | void __host_to_ieee_32 (_Decimal32 in, decimal32 *out); | |
46 | void __ieee_to_host_32 (decimal32 in, _Decimal32 *out); | |
47 | #endif | |
48 | #if WIDTH == 64 || WIDTH_TO == 64 | |
49 | void __host_to_ieee_64 (_Decimal64 in, decimal64 *out); | |
50 | void __ieee_to_host_64 (decimal64 in, _Decimal64 *out); | |
51 | #endif | |
52 | #if WIDTH == 128 || WIDTH_TO == 128 | |
53 | void __host_to_ieee_128 (_Decimal128 in, decimal128 *out); | |
54 | void __ieee_to_host_128 (decimal128 in, _Decimal128 *out); | |
55 | #endif | |
56 | ||
57 | /* A pointer to a binary decFloat operation. */ | |
58 | typedef decFloat* (*dfp_binary_func) | |
59 | (decFloat *, const decFloat *, const decFloat *, decContext *); | |
60 | \f | |
61 | /* Binary operations. */ | |
62 | ||
63 | /* Use a decFloat (decDouble or decQuad) function to perform a DFP | |
64 | binary operation. */ | |
65 | static inline decFloat | |
66 | dfp_binary_op (dfp_binary_func op, decFloat arg_a, decFloat arg_b) | |
67 | { | |
68 | decFloat result; | |
69 | decContext context; | |
70 | ||
71 | decContextDefault (&context, CONTEXT_INIT); | |
72 | DFP_INIT_ROUNDMODE (context.round); | |
73 | ||
74 | /* Perform the operation. */ | |
75 | op (&result, &arg_a, &arg_b, &context); | |
76 | ||
77 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
78 | { | |
79 | /* decNumber exception flags we care about here. */ | |
80 | int ieee_flags; | |
81 | int dec_flags = DEC_IEEE_854_Division_by_zero | DEC_IEEE_854_Inexact | |
82 | | DEC_IEEE_854_Invalid_operation | DEC_IEEE_854_Overflow | |
83 | | DEC_IEEE_854_Underflow; | |
84 | dec_flags &= context.status; | |
85 | ieee_flags = DFP_IEEE_FLAGS (dec_flags); | |
86 | if (ieee_flags != 0) | |
87 | DFP_HANDLE_EXCEPTIONS (ieee_flags); | |
88 | } | |
89 | ||
90 | return result; | |
91 | } | |
92 | ||
93 | #if WIDTH == 32 | |
94 | /* The decNumber package doesn't provide arithmetic for decSingle (32 bits); | |
95 | convert to decDouble, use the operation for that, and convert back. */ | |
96 | static inline _Decimal32 | |
97 | d32_binary_op (dfp_binary_func op, _Decimal32 arg_a, _Decimal32 arg_b) | |
98 | { | |
99 | union { _Decimal32 c; decSingle f; } a32, b32, res32; | |
100 | decDouble a, b, res; | |
101 | decContext context; | |
102 | ||
103 | /* Widen the operands and perform the operation. */ | |
104 | a32.c = arg_a; | |
105 | b32.c = arg_b; | |
106 | decSingleToWider (&a32.f, &a); | |
107 | decSingleToWider (&b32.f, &b); | |
108 | res = dfp_binary_op (op, a, b); | |
109 | ||
110 | /* Narrow the result, which might result in an underflow or overflow. */ | |
111 | decContextDefault (&context, CONTEXT_INIT); | |
112 | DFP_INIT_ROUNDMODE (context.round); | |
113 | decSingleFromWider (&res32.f, &res, &context); | |
114 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
115 | { | |
116 | /* decNumber exception flags we care about here. */ | |
117 | int ieee_flags; | |
118 | int dec_flags = DEC_IEEE_854_Inexact | DEC_IEEE_854_Overflow | |
119 | | DEC_IEEE_854_Underflow; | |
120 | dec_flags &= context.status; | |
121 | ieee_flags = DFP_IEEE_FLAGS (dec_flags); | |
122 | if (ieee_flags != 0) | |
123 | DFP_HANDLE_EXCEPTIONS (ieee_flags); | |
124 | } | |
125 | ||
126 | return res32.c; | |
127 | } | |
128 | #else | |
129 | /* decFloat operations are supported for decDouble (64 bits) and | |
130 | decQuad (128 bits). The bit patterns for the types are the same. */ | |
131 | static inline DFP_C_TYPE | |
132 | dnn_binary_op (dfp_binary_func op, DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
133 | { | |
134 | union { DFP_C_TYPE c; decFloat f; } a, b, result; | |
135 | ||
136 | a.c = arg_a; | |
137 | b.c = arg_b; | |
138 | result.f = dfp_binary_op (op, a.f, b.f); | |
139 | return result.c; | |
140 | } | |
141 | #endif | |
142 | ||
143 | /* Comparison operations. */ | |
144 | ||
145 | /* Use a decFloat (decDouble or decQuad) function to perform a DFP | |
146 | comparison. */ | |
147 | static inline CMPtype | |
148 | dfp_compare_op (dfp_binary_func op, decFloat arg_a, decFloat arg_b) | |
149 | { | |
150 | decContext context; | |
151 | decFloat res; | |
152 | int result; | |
153 | ||
154 | decContextDefault (&context, CONTEXT_INIT); | |
155 | DFP_INIT_ROUNDMODE (context.round); | |
156 | ||
157 | /* Perform the comparison. */ | |
158 | op (&res, &arg_a, &arg_b, &context); | |
159 | ||
160 | if (DEC_FLOAT_IS_SIGNED (&res)) | |
161 | result = -1; | |
162 | else if (DEC_FLOAT_IS_ZERO (&res)) | |
163 | result = 0; | |
164 | else if (DEC_FLOAT_IS_NAN (&res)) | |
165 | result = -2; | |
166 | else | |
167 | result = 1; | |
168 | ||
169 | return (CMPtype) result; | |
170 | } | |
171 | ||
172 | #if WIDTH == 32 | |
173 | /* The decNumber package doesn't provide comparisons for decSingle (32 bits); | |
174 | convert to decDouble, use the operation for that, and convert back. */ | |
175 | static inline CMPtype | |
176 | d32_compare_op (dfp_binary_func op, _Decimal32 arg_a, _Decimal32 arg_b) | |
177 | { | |
178 | union { _Decimal32 c; decSingle f; } a32, b32; | |
179 | decDouble a, b; | |
180 | ||
181 | a32.c = arg_a; | |
182 | b32.c = arg_b; | |
183 | decSingleToWider (&a32.f, &a); | |
184 | decSingleToWider (&b32.f, &b); | |
185 | return dfp_compare_op (op, a, b); | |
186 | } | |
187 | #else | |
188 | /* decFloat comparisons are supported for decDouble (64 bits) and | |
189 | decQuad (128 bits). The bit patterns for the types are the same. */ | |
190 | static inline CMPtype | |
191 | dnn_compare_op (dfp_binary_func op, DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
192 | { | |
193 | union { DFP_C_TYPE c; decFloat f; } a, b; | |
194 | ||
195 | a.c = arg_a; | |
196 | b.c = arg_b; | |
197 | return dfp_compare_op (op, a.f, b.f); | |
198 | } | |
199 | #endif | |
200 | \f | |
201 | #if defined(L_conv_sd) | |
202 | void | |
203 | __host_to_ieee_32 (_Decimal32 in, decimal32 *out) | |
204 | { | |
205 | memcpy (out, &in, 4); | |
206 | } | |
207 | ||
208 | void | |
209 | __ieee_to_host_32 (decimal32 in, _Decimal32 *out) | |
210 | { | |
211 | memcpy (out, &in, 4); | |
212 | } | |
213 | #endif /* L_conv_sd */ | |
214 | ||
215 | #if defined(L_conv_dd) | |
216 | void | |
217 | __host_to_ieee_64 (_Decimal64 in, decimal64 *out) | |
218 | { | |
219 | memcpy (out, &in, 8); | |
220 | } | |
221 | ||
222 | void | |
223 | __ieee_to_host_64 (decimal64 in, _Decimal64 *out) | |
224 | { | |
225 | memcpy (out, &in, 8); | |
226 | } | |
227 | #endif /* L_conv_dd */ | |
228 | ||
229 | #if defined(L_conv_td) | |
230 | void | |
231 | __host_to_ieee_128 (_Decimal128 in, decimal128 *out) | |
232 | { | |
233 | memcpy (out, &in, 16); | |
234 | } | |
235 | ||
236 | void | |
237 | __ieee_to_host_128 (decimal128 in, _Decimal128 *out) | |
238 | { | |
239 | memcpy (out, &in, 16); | |
240 | } | |
241 | #endif /* L_conv_td */ | |
242 | ||
243 | #if defined(L_addsub_sd) || defined(L_addsub_dd) || defined(L_addsub_td) | |
244 | DFP_C_TYPE | |
245 | DFP_ADD (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
246 | { | |
247 | return DFP_BINARY_OP (DEC_FLOAT_ADD, arg_a, arg_b); | |
248 | } | |
249 | ||
250 | DFP_C_TYPE | |
251 | DFP_SUB (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
252 | { | |
253 | return DFP_BINARY_OP (DEC_FLOAT_SUBTRACT, arg_a, arg_b); | |
254 | } | |
255 | #endif /* L_addsub */ | |
256 | ||
257 | #if defined(L_mul_sd) || defined(L_mul_dd) || defined(L_mul_td) | |
258 | DFP_C_TYPE | |
259 | DFP_MULTIPLY (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
260 | { | |
261 | return DFP_BINARY_OP (DEC_FLOAT_MULTIPLY, arg_a, arg_b); | |
262 | } | |
263 | #endif /* L_mul */ | |
264 | ||
265 | #if defined(L_div_sd) || defined(L_div_dd) || defined(L_div_td) | |
266 | DFP_C_TYPE | |
267 | DFP_DIVIDE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
268 | { | |
269 | return DFP_BINARY_OP (DEC_FLOAT_DIVIDE, arg_a, arg_b); | |
270 | } | |
271 | #endif /* L_div */ | |
272 | ||
273 | #if defined (L_eq_sd) || defined (L_eq_dd) || defined (L_eq_td) | |
274 | CMPtype | |
275 | DFP_EQ (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
276 | { | |
277 | CMPtype stat; | |
278 | stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b); | |
279 | /* For EQ return zero for true, nonzero for false. */ | |
280 | return stat != 0; | |
281 | } | |
282 | #endif /* L_eq */ | |
283 | ||
284 | #if defined (L_ne_sd) || defined (L_ne_dd) || defined (L_ne_td) | |
285 | CMPtype | |
286 | DFP_NE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
287 | { | |
288 | int stat; | |
289 | stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b); | |
290 | /* For NE return zero for true, nonzero for false. */ | |
291 | if (__builtin_expect (stat == -2, 0)) /* An operand is NaN. */ | |
292 | return 1; | |
293 | return stat != 0; | |
294 | } | |
295 | #endif /* L_ne */ | |
296 | ||
297 | #if defined (L_lt_sd) || defined (L_lt_dd) || defined (L_lt_td) | |
298 | CMPtype | |
299 | DFP_LT (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
300 | { | |
301 | int stat; | |
302 | stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b); | |
303 | /* For LT return -1 (<0) for true, 1 for false. */ | |
304 | return (stat == -1) ? -1 : 1; | |
305 | } | |
306 | #endif /* L_lt */ | |
307 | ||
308 | #if defined (L_gt_sd) || defined (L_gt_dd) || defined (L_gt_td) | |
309 | CMPtype | |
310 | DFP_GT (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
311 | { | |
312 | int stat; | |
313 | stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b); | |
314 | /* For GT return 1 (>0) for true, -1 for false. */ | |
315 | return (stat == 1) ? 1 : -1; | |
316 | } | |
317 | #endif | |
318 | ||
319 | #if defined (L_le_sd) || defined (L_le_dd) || defined (L_le_td) | |
320 | CMPtype | |
321 | DFP_LE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
322 | { | |
323 | int stat; | |
324 | stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b); | |
325 | /* For LE return 0 (<= 0) for true, 1 for false. */ | |
326 | if (__builtin_expect (stat == -2, 0)) /* An operand is NaN. */ | |
327 | return 1; | |
328 | return stat == 1; | |
329 | } | |
330 | #endif /* L_le */ | |
331 | ||
332 | #if defined (L_ge_sd) || defined (L_ge_dd) || defined (L_ge_td) | |
333 | CMPtype | |
334 | DFP_GE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
335 | { | |
336 | int stat; | |
337 | stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b); | |
338 | /* For GE return 1 (>=0) for true, -1 for false. */ | |
339 | if (__builtin_expect (stat == -2, 0)) /* An operand is NaN. */ | |
340 | return -1; | |
341 | return (stat != -1) ? 1 : -1; | |
342 | } | |
343 | #endif /* L_ge */ | |
344 | ||
345 | #define BUFMAX 128 | |
346 | ||
347 | /* Check for floating point exceptions that are relevant for conversions | |
348 | between decimal float values and handle them. */ | |
349 | static inline void | |
350 | dfp_conversion_exceptions (const int status) | |
351 | { | |
352 | /* decNumber exception flags we care about here. */ | |
353 | int ieee_flags; | |
354 | int dec_flags = DEC_IEEE_854_Inexact | DEC_IEEE_854_Invalid_operation | |
355 | | DEC_IEEE_854_Overflow; | |
356 | dec_flags &= status; | |
357 | ieee_flags = DFP_IEEE_FLAGS (dec_flags); | |
358 | if (ieee_flags != 0) | |
359 | DFP_HANDLE_EXCEPTIONS (ieee_flags); | |
360 | } | |
361 | ||
362 | #if defined (L_sd_to_dd) | |
363 | /* Use decNumber to convert directly from _Decimal32 to _Decimal64. */ | |
364 | _Decimal64 | |
365 | DFP_TO_DFP (_Decimal32 f_from) | |
366 | { | |
367 | union { _Decimal32 c; decSingle f; } from; | |
368 | union { _Decimal64 c; decDouble f; } to; | |
369 | ||
370 | from.c = f_from; | |
371 | to.f = *decSingleToWider (&from.f, &to.f); | |
372 | return to.c; | |
373 | } | |
374 | #endif | |
375 | ||
376 | #if defined (L_sd_to_td) | |
377 | /* Use decNumber to convert directly from _Decimal32 to _Decimal128. */ | |
378 | _Decimal128 | |
379 | DFP_TO_DFP (_Decimal32 f_from) | |
380 | { | |
381 | union { _Decimal32 c; decSingle f; } from; | |
382 | union { _Decimal128 c; decQuad f; } to; | |
383 | decDouble temp; | |
384 | ||
385 | from.c = f_from; | |
386 | temp = *decSingleToWider (&from.f, &temp); | |
387 | to.f = *decDoubleToWider (&temp, &to.f); | |
388 | return to.c; | |
389 | } | |
390 | #endif | |
391 | ||
392 | #if defined (L_dd_to_td) | |
393 | /* Use decNumber to convert directly from _Decimal64 to _Decimal128. */ | |
394 | _Decimal128 | |
395 | DFP_TO_DFP (_Decimal64 f_from) | |
396 | { | |
397 | union { _Decimal64 c; decDouble f; } from; | |
398 | union { _Decimal128 c; decQuad f; } to; | |
399 | ||
400 | from.c = f_from; | |
401 | to.f = *decDoubleToWider (&from.f, &to.f); | |
402 | return to.c; | |
403 | } | |
404 | #endif | |
405 | ||
406 | #if defined (L_dd_to_sd) | |
407 | /* Use decNumber to convert directly from _Decimal64 to _Decimal32. */ | |
408 | _Decimal32 | |
409 | DFP_TO_DFP (_Decimal64 f_from) | |
410 | { | |
411 | union { _Decimal32 c; decSingle f; } to; | |
412 | union { _Decimal64 c; decDouble f; } from; | |
413 | decContext context; | |
414 | ||
415 | decContextDefault (&context, CONTEXT_INIT); | |
416 | DFP_INIT_ROUNDMODE (context.round); | |
417 | from.c = f_from; | |
418 | to.f = *decSingleFromWider (&to.f, &from.f, &context); | |
419 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
420 | dfp_conversion_exceptions (context.status); | |
421 | return to.c; | |
422 | } | |
423 | #endif | |
424 | ||
425 | #if defined (L_td_to_sd) | |
426 | /* Use decNumber to convert directly from _Decimal128 to _Decimal32. */ | |
427 | _Decimal32 | |
428 | DFP_TO_DFP (_Decimal128 f_from) | |
429 | { | |
430 | union { _Decimal32 c; decSingle f; } to; | |
431 | union { _Decimal128 c; decQuad f; } from; | |
432 | decDouble temp; | |
433 | decContext context; | |
434 | ||
435 | decContextDefault (&context, CONTEXT_INIT); | |
436 | DFP_INIT_ROUNDMODE (context.round); | |
437 | from.c = f_from; | |
438 | temp = *decDoubleFromWider (&temp, &from.f, &context); | |
439 | to.f = *decSingleFromWider (&to.f, &temp, &context); | |
440 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
441 | dfp_conversion_exceptions (context.status); | |
442 | return to.c; | |
443 | } | |
444 | #endif | |
445 | ||
446 | #if defined (L_td_to_dd) | |
447 | /* Use decNumber to convert directly from _Decimal128 to _Decimal64. */ | |
448 | _Decimal64 | |
449 | DFP_TO_DFP (_Decimal128 f_from) | |
450 | { | |
451 | union { _Decimal64 c; decDouble f; } to; | |
452 | union { _Decimal128 c; decQuad f; } from; | |
453 | decContext context; | |
454 | ||
455 | decContextDefault (&context, CONTEXT_INIT); | |
456 | DFP_INIT_ROUNDMODE (context.round); | |
457 | from.c = f_from; | |
458 | to.f = *decDoubleFromWider (&to.f, &from.f, &context); | |
459 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
460 | dfp_conversion_exceptions (context.status); | |
461 | return to.c; | |
462 | } | |
463 | #endif | |
464 | ||
465 | #if defined (L_dd_to_si) || defined (L_td_to_si) \ | |
466 | || defined (L_dd_to_usi) || defined (L_td_to_usi) | |
467 | /* Use decNumber to convert directly from decimal float to integer types. */ | |
468 | INT_TYPE | |
469 | DFP_TO_INT (DFP_C_TYPE x) | |
470 | { | |
471 | union { DFP_C_TYPE c; decFloat f; } u; | |
472 | decContext context; | |
473 | INT_TYPE i; | |
474 | ||
475 | decContextDefault (&context, DEC_INIT_DECIMAL128); | |
476 | context.round = DEC_ROUND_DOWN; | |
477 | u.c = x; | |
478 | i = DEC_FLOAT_TO_INT (&u.f, &context, context.round); | |
479 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
480 | dfp_conversion_exceptions (context.status); | |
481 | return i; | |
482 | } | |
483 | #endif | |
484 | ||
485 | #if defined (L_sd_to_si) || (L_sd_to_usi) | |
486 | /* Use decNumber to convert directly from decimal float to integer types. */ | |
487 | INT_TYPE | |
488 | DFP_TO_INT (_Decimal32 x) | |
489 | { | |
490 | union { _Decimal32 c; decSingle f; } u32; | |
491 | decDouble f64; | |
492 | decContext context; | |
493 | INT_TYPE i; | |
494 | ||
495 | decContextDefault (&context, DEC_INIT_DECIMAL128); | |
496 | context.round = DEC_ROUND_DOWN; | |
497 | u32.c = x; | |
498 | f64 = *decSingleToWider (&u32.f, &f64); | |
499 | i = DEC_FLOAT_TO_INT (&f64, &context, context.round); | |
500 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
501 | dfp_conversion_exceptions (context.status); | |
502 | return i; | |
503 | } | |
504 | #endif | |
505 | ||
506 | #if defined (L_sd_to_di) || defined (L_dd_to_di) || defined (L_td_to_di) \ | |
507 | || defined (L_sd_to_udi) || defined (L_dd_to_udi) || defined (L_td_to_udi) | |
508 | /* decNumber doesn't provide support for conversions to 64-bit integer | |
509 | types, so do it the hard way. */ | |
510 | INT_TYPE | |
511 | DFP_TO_INT (DFP_C_TYPE x) | |
512 | { | |
513 | /* decNumber's decimal* types have the same format as C's _Decimal* | |
514 | types, but they have different calling conventions. */ | |
515 | ||
516 | /* TODO: Decimal float to integer conversions should raise FE_INVALID | |
517 | if the result value does not fit into the result type. */ | |
518 | ||
519 | IEEE_TYPE s; | |
520 | char buf[BUFMAX]; | |
521 | char *pos; | |
522 | decNumber qval, n1, n2; | |
523 | decContext context; | |
524 | ||
525 | /* Use a large context to avoid losing precision. */ | |
526 | decContextDefault (&context, DEC_INIT_DECIMAL128); | |
527 | /* Need non-default rounding mode here. */ | |
528 | context.round = DEC_ROUND_DOWN; | |
529 | ||
530 | HOST_TO_IEEE (x, &s); | |
531 | TO_INTERNAL (&s, &n1); | |
532 | /* Rescale if the exponent is less than zero. */ | |
533 | decNumberToIntegralValue (&n2, &n1, &context); | |
534 | /* Get a value to use for the quantize call. */ | |
535 | decNumberFromString (&qval, "1.", &context); | |
536 | /* Force the exponent to zero. */ | |
537 | decNumberQuantize (&n1, &n2, &qval, &context); | |
538 | /* Get a string, which at this point will not include an exponent. */ | |
539 | decNumberToString (&n1, buf); | |
540 | /* Ignore the fractional part. */ | |
541 | pos = strchr (buf, '.'); | |
542 | if (pos) | |
543 | *pos = 0; | |
544 | /* Use a C library function to convert to the integral type. */ | |
545 | return STR_TO_INT (buf, NULL, 10); | |
546 | } | |
547 | #endif | |
548 | ||
549 | #if defined (L_si_to_dd) || defined (L_si_to_td) \ | |
550 | || defined (L_usi_to_dd) || defined (L_usi_to_td) | |
551 | /* Use decNumber to convert directly from integer to decimal float types. */ | |
552 | DFP_C_TYPE | |
553 | INT_TO_DFP (INT_TYPE i) | |
554 | { | |
555 | union { DFP_C_TYPE c; decFloat f; } u; | |
556 | ||
557 | u.f = *DEC_FLOAT_FROM_INT (&u.f, i); | |
558 | return u.c; | |
559 | } | |
560 | #endif | |
561 | ||
562 | #if defined (L_si_to_sd) || defined (L_usi_to_sd) | |
563 | _Decimal32 | |
564 | /* Use decNumber to convert directly from integer to decimal float types. */ | |
565 | INT_TO_DFP (INT_TYPE i) | |
566 | { | |
567 | union { _Decimal32 c; decSingle f; } u32; | |
568 | decDouble f64; | |
569 | decContext context; | |
570 | ||
571 | decContextDefault (&context, DEC_INIT_DECIMAL128); | |
572 | f64 = *DEC_FLOAT_FROM_INT (&f64, i); | |
573 | u32.f = *decSingleFromWider (&u32.f, &f64, &context); | |
574 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
575 | dfp_conversion_exceptions (context.status); | |
576 | return u32.c; | |
577 | } | |
578 | #endif | |
579 | ||
580 | #if defined (L_di_to_sd) || defined (L_di_to_dd) || defined (L_di_to_td) \ | |
581 | || defined (L_udi_to_sd) || defined (L_udi_to_dd) || defined (L_udi_to_td) | |
582 | /* decNumber doesn't provide support for conversions from 64-bit integer | |
583 | types, so do it the hard way. */ | |
584 | DFP_C_TYPE | |
585 | INT_TO_DFP (INT_TYPE i) | |
586 | { | |
587 | DFP_C_TYPE f; | |
588 | IEEE_TYPE s; | |
589 | char buf[BUFMAX]; | |
590 | decContext context; | |
591 | ||
592 | decContextDefault (&context, CONTEXT_INIT); | |
593 | DFP_INIT_ROUNDMODE (context.round); | |
594 | ||
595 | /* Use a C library function to get a floating point string. */ | |
596 | sprintf (buf, INT_FMT ".", CAST_FOR_FMT(i)); | |
597 | /* Convert from the floating point string to a decimal* type. */ | |
598 | FROM_STRING (&s, buf, &context); | |
599 | IEEE_TO_HOST (s, &f); | |
600 | ||
601 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
602 | dfp_conversion_exceptions (context.status); | |
603 | ||
604 | return f; | |
605 | } | |
606 | #endif | |
607 | ||
608 | #if defined (L_sd_to_sf) || defined (L_dd_to_sf) || defined (L_td_to_sf) \ | |
609 | || defined (L_sd_to_df) || defined (L_dd_to_df) || defined (L_td_to_df) \ | |
610 | || ((defined (L_sd_to_xf) || defined (L_dd_to_xf) || defined (L_td_to_xf)) \ | |
611 | && LONG_DOUBLE_HAS_XF_MODE) \ | |
612 | || ((defined (L_sd_to_tf) || defined (L_dd_to_tf) || defined (L_td_to_tf)) \ | |
613 | && LONG_DOUBLE_HAS_TF_MODE) | |
614 | BFP_TYPE | |
615 | DFP_TO_BFP (DFP_C_TYPE f) | |
616 | { | |
617 | IEEE_TYPE s; | |
618 | char buf[BUFMAX]; | |
619 | ||
620 | HOST_TO_IEEE (f, &s); | |
621 | /* Write the value to a string. */ | |
622 | TO_STRING (&s, buf); | |
623 | /* Read it as the binary floating point type and return that. */ | |
624 | return STR_TO_BFP (buf, NULL); | |
625 | } | |
626 | #endif | |
627 | ||
628 | #if defined (L_sf_to_sd) || defined (L_sf_to_dd) || defined (L_sf_to_td) \ | |
629 | || defined (L_df_to_sd) || defined (L_df_to_dd) || defined (L_df_to_td) \ | |
630 | || ((defined (L_xf_to_sd) || defined (L_xf_to_dd) || defined (L_xf_to_td)) \ | |
631 | && LONG_DOUBLE_HAS_XF_MODE) \ | |
632 | || ((defined (L_tf_to_sd) || defined (L_tf_to_dd) || defined (L_tf_to_td)) \ | |
633 | && LONG_DOUBLE_HAS_TF_MODE) | |
634 | DFP_C_TYPE | |
635 | BFP_TO_DFP (BFP_TYPE x) | |
636 | { | |
637 | DFP_C_TYPE f; | |
638 | IEEE_TYPE s; | |
639 | char buf[BUFMAX]; | |
640 | decContext context; | |
641 | ||
642 | decContextDefault (&context, CONTEXT_INIT); | |
643 | DFP_INIT_ROUNDMODE (context.round); | |
644 | ||
645 | /* Use a C library function to write the floating point value to a string. */ | |
646 | sprintf (buf, BFP_FMT, (BFP_VIA_TYPE) x); | |
647 | ||
648 | /* Convert from the floating point string to a decimal* type. */ | |
649 | FROM_STRING (&s, buf, &context); | |
650 | IEEE_TO_HOST (s, &f); | |
651 | ||
652 | if (DFP_EXCEPTIONS_ENABLED && context.status != 0) | |
653 | { | |
654 | /* decNumber exception flags we care about here. */ | |
655 | int ieee_flags; | |
656 | int dec_flags = DEC_IEEE_854_Inexact | DEC_IEEE_854_Invalid_operation | |
657 | | DEC_IEEE_854_Overflow | DEC_IEEE_854_Underflow; | |
658 | dec_flags &= context.status; | |
659 | ieee_flags = DFP_IEEE_FLAGS (dec_flags); | |
660 | if (ieee_flags != 0) | |
661 | DFP_HANDLE_EXCEPTIONS (ieee_flags); | |
662 | } | |
663 | ||
664 | return f; | |
665 | } | |
666 | #endif | |
667 | ||
668 | #if defined (L_unord_sd) || defined (L_unord_dd) || defined (L_unord_td) | |
669 | CMPtype | |
670 | DFP_UNORD (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b) | |
671 | { | |
672 | decNumber arg1, arg2; | |
673 | IEEE_TYPE a, b; | |
674 | ||
675 | HOST_TO_IEEE (arg_a, &a); | |
676 | HOST_TO_IEEE (arg_b, &b); | |
677 | TO_INTERNAL (&a, &arg1); | |
678 | TO_INTERNAL (&b, &arg2); | |
679 | return (decNumberIsNaN (&arg1) || decNumberIsNaN (&arg2)); | |
680 | } | |
681 | #endif /* L_unord_sd || L_unord_dd || L_unord_td */ |