Commit | Line | Data |
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252b5132 | 1 | /* IEEE floating point support routines, for GDB, the GNU Debugger. |
3f2aacaf | 2 | Copyright (C) 1991, 1994, 1999, 2000, 2003 Free Software Foundation, Inc. |
252b5132 RH |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
b52927b7 DD |
20 | /* This is needed to pick up the NAN macro on some systems. */ |
21 | #define _GNU_SOURCE | |
22 | ||
23 | #ifdef HAVE_CONFIG_H | |
24 | #include "config.h" | |
25 | #endif | |
26 | ||
27 | #include <math.h> | |
28 | ||
29 | #ifdef HAVE_STRING_H | |
30 | #include <string.h> | |
31 | #endif | |
32 | ||
1ea16ec5 | 33 | #include "ansidecl.h" |
b52927b7 | 34 | #include "libiberty.h" |
252b5132 | 35 | #include "floatformat.h" |
b52927b7 DD |
36 | |
37 | #ifndef INFINITY | |
38 | #ifdef HUGE_VAL | |
39 | #define INFINITY HUGE_VAL | |
252b5132 | 40 | #else |
b52927b7 DD |
41 | #define INFINITY (1.0 / 0.0) |
42 | #endif | |
43 | #endif | |
44 | ||
45 | #ifndef NAN | |
46 | #define NAN (0.0 / 0.0) | |
252b5132 RH |
47 | #endif |
48 | ||
5324d185 AC |
49 | static unsigned long get_field PARAMS ((const unsigned char *, |
50 | enum floatformat_byteorders, | |
51 | unsigned int, | |
52 | unsigned int, | |
53 | unsigned int)); | |
54 | static int floatformat_always_valid PARAMS ((const struct floatformat *fmt, | |
55 | const char *from)); | |
56 | ||
57 | static int | |
58 | floatformat_always_valid (fmt, from) | |
e7e6980b DD |
59 | const struct floatformat *fmt ATTRIBUTE_UNUSED; |
60 | const char *from ATTRIBUTE_UNUSED; | |
5324d185 AC |
61 | { |
62 | return 1; | |
63 | } | |
64 | ||
252b5132 RH |
65 | /* The odds that CHAR_BIT will be anything but 8 are low enough that I'm not |
66 | going to bother with trying to muck around with whether it is defined in | |
67 | a system header, what we do if not, etc. */ | |
68 | #define FLOATFORMAT_CHAR_BIT 8 | |
69 | ||
70 | /* floatformats for IEEE single and double, big and little endian. */ | |
71 | const struct floatformat floatformat_ieee_single_big = | |
72 | { | |
f03aa80d AC |
73 | floatformat_big, 32, 0, 1, 8, 127, 255, 9, 23, |
74 | floatformat_intbit_no, | |
5324d185 AC |
75 | "floatformat_ieee_single_big", |
76 | floatformat_always_valid | |
252b5132 RH |
77 | }; |
78 | const struct floatformat floatformat_ieee_single_little = | |
79 | { | |
f03aa80d AC |
80 | floatformat_little, 32, 0, 1, 8, 127, 255, 9, 23, |
81 | floatformat_intbit_no, | |
5324d185 AC |
82 | "floatformat_ieee_single_little", |
83 | floatformat_always_valid | |
252b5132 RH |
84 | }; |
85 | const struct floatformat floatformat_ieee_double_big = | |
86 | { | |
f03aa80d AC |
87 | floatformat_big, 64, 0, 1, 11, 1023, 2047, 12, 52, |
88 | floatformat_intbit_no, | |
5324d185 AC |
89 | "floatformat_ieee_double_big", |
90 | floatformat_always_valid | |
252b5132 RH |
91 | }; |
92 | const struct floatformat floatformat_ieee_double_little = | |
93 | { | |
f03aa80d AC |
94 | floatformat_little, 64, 0, 1, 11, 1023, 2047, 12, 52, |
95 | floatformat_intbit_no, | |
5324d185 AC |
96 | "floatformat_ieee_double_little", |
97 | floatformat_always_valid | |
252b5132 RH |
98 | }; |
99 | ||
100 | /* floatformat for IEEE double, little endian byte order, with big endian word | |
101 | ordering, as on the ARM. */ | |
102 | ||
103 | const struct floatformat floatformat_ieee_double_littlebyte_bigword = | |
104 | { | |
f03aa80d AC |
105 | floatformat_littlebyte_bigword, 64, 0, 1, 11, 1023, 2047, 12, 52, |
106 | floatformat_intbit_no, | |
5324d185 AC |
107 | "floatformat_ieee_double_littlebyte_bigword", |
108 | floatformat_always_valid | |
252b5132 RH |
109 | }; |
110 | ||
5324d185 AC |
111 | static int floatformat_i387_ext_is_valid PARAMS ((const struct floatformat *fmt, const char *from)); |
112 | ||
113 | static int | |
114 | floatformat_i387_ext_is_valid (fmt, from) | |
115 | const struct floatformat *fmt; | |
116 | const char *from; | |
117 | { | |
118 | /* In the i387 double-extended format, if the exponent is all ones, | |
119 | then the integer bit must be set. If the exponent is neither 0 | |
120 | nor ~0, the intbit must also be set. Only if the exponent is | |
121 | zero can it be zero, and then it must be zero. */ | |
122 | unsigned long exponent, int_bit; | |
123 | const unsigned char *ufrom = (const unsigned char *) from; | |
124 | ||
125 | exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize, | |
126 | fmt->exp_start, fmt->exp_len); | |
127 | int_bit = get_field (ufrom, fmt->byteorder, fmt->totalsize, | |
128 | fmt->man_start, 1); | |
129 | ||
130 | if ((exponent == 0) != (int_bit == 0)) | |
131 | return 0; | |
132 | else | |
133 | return 1; | |
134 | } | |
135 | ||
252b5132 RH |
136 | const struct floatformat floatformat_i387_ext = |
137 | { | |
138 | floatformat_little, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64, | |
f03aa80d | 139 | floatformat_intbit_yes, |
5324d185 AC |
140 | "floatformat_i387_ext", |
141 | floatformat_i387_ext_is_valid | |
252b5132 RH |
142 | }; |
143 | const struct floatformat floatformat_m68881_ext = | |
144 | { | |
145 | /* Note that the bits from 16 to 31 are unused. */ | |
f03aa80d AC |
146 | floatformat_big, 96, 0, 1, 15, 0x3fff, 0x7fff, 32, 64, |
147 | floatformat_intbit_yes, | |
5324d185 AC |
148 | "floatformat_m68881_ext", |
149 | floatformat_always_valid | |
252b5132 RH |
150 | }; |
151 | const struct floatformat floatformat_i960_ext = | |
152 | { | |
153 | /* Note that the bits from 0 to 15 are unused. */ | |
154 | floatformat_little, 96, 16, 17, 15, 0x3fff, 0x7fff, 32, 64, | |
f03aa80d | 155 | floatformat_intbit_yes, |
5324d185 AC |
156 | "floatformat_i960_ext", |
157 | floatformat_always_valid | |
252b5132 RH |
158 | }; |
159 | const struct floatformat floatformat_m88110_ext = | |
160 | { | |
eb828599 AC |
161 | floatformat_big, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64, |
162 | floatformat_intbit_yes, | |
5324d185 AC |
163 | "floatformat_m88110_ext", |
164 | floatformat_always_valid | |
eb828599 AC |
165 | }; |
166 | const struct floatformat floatformat_m88110_harris_ext = | |
167 | { | |
252b5132 RH |
168 | /* Harris uses raw format 128 bytes long, but the number is just an ieee |
169 | double, and the last 64 bits are wasted. */ | |
170 | floatformat_big,128, 0, 1, 11, 0x3ff, 0x7ff, 12, 52, | |
f03aa80d | 171 | floatformat_intbit_no, |
5324d185 AC |
172 | "floatformat_m88110_ext_harris", |
173 | floatformat_always_valid | |
252b5132 | 174 | }; |
eb828599 AC |
175 | const struct floatformat floatformat_arm_ext_big = |
176 | { | |
177 | /* Bits 1 to 16 are unused. */ | |
178 | floatformat_big, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64, | |
179 | floatformat_intbit_yes, | |
5324d185 AC |
180 | "floatformat_arm_ext_big", |
181 | floatformat_always_valid | |
eb828599 AC |
182 | }; |
183 | const struct floatformat floatformat_arm_ext_littlebyte_bigword = | |
184 | { | |
185 | /* Bits 1 to 16 are unused. */ | |
186 | floatformat_littlebyte_bigword, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64, | |
187 | floatformat_intbit_yes, | |
5324d185 AC |
188 | "floatformat_arm_ext_littlebyte_bigword", |
189 | floatformat_always_valid | |
eb828599 AC |
190 | }; |
191 | const struct floatformat floatformat_ia64_spill_big = | |
192 | { | |
193 | floatformat_big, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64, | |
194 | floatformat_intbit_yes, | |
5324d185 AC |
195 | "floatformat_ia64_spill_big", |
196 | floatformat_always_valid | |
eb828599 AC |
197 | }; |
198 | const struct floatformat floatformat_ia64_spill_little = | |
199 | { | |
200 | floatformat_little, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64, | |
201 | floatformat_intbit_yes, | |
5324d185 AC |
202 | "floatformat_ia64_spill_little", |
203 | floatformat_always_valid | |
eb828599 AC |
204 | }; |
205 | const struct floatformat floatformat_ia64_quad_big = | |
206 | { | |
207 | floatformat_big, 128, 0, 1, 15, 16383, 0x7fff, 16, 112, | |
208 | floatformat_intbit_no, | |
5324d185 AC |
209 | "floatformat_ia64_quad_big", |
210 | floatformat_always_valid | |
eb828599 AC |
211 | }; |
212 | const struct floatformat floatformat_ia64_quad_little = | |
213 | { | |
214 | floatformat_little, 128, 0, 1, 15, 16383, 0x7fff, 16, 112, | |
215 | floatformat_intbit_no, | |
5324d185 AC |
216 | "floatformat_ia64_quad_little", |
217 | floatformat_always_valid | |
eb828599 | 218 | }; |
252b5132 | 219 | \f |
3f2aacaf | 220 | /* Extract a field which starts at START and is LEN bits long. DATA and |
252b5132 RH |
221 | TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */ |
222 | static unsigned long | |
223 | get_field (data, order, total_len, start, len) | |
34f4a113 | 224 | const unsigned char *data; |
252b5132 RH |
225 | enum floatformat_byteorders order; |
226 | unsigned int total_len; | |
227 | unsigned int start; | |
228 | unsigned int len; | |
229 | { | |
230 | unsigned long result; | |
231 | unsigned int cur_byte; | |
232 | int cur_bitshift; | |
233 | ||
234 | /* Start at the least significant part of the field. */ | |
235 | cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT; | |
236 | if (order == floatformat_little) | |
237 | cur_byte = (total_len / FLOATFORMAT_CHAR_BIT) - cur_byte - 1; | |
238 | cur_bitshift = | |
239 | ((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT; | |
240 | result = *(data + cur_byte) >> (-cur_bitshift); | |
241 | cur_bitshift += FLOATFORMAT_CHAR_BIT; | |
242 | if (order == floatformat_little) | |
243 | ++cur_byte; | |
244 | else | |
245 | --cur_byte; | |
246 | ||
247 | /* Move towards the most significant part of the field. */ | |
08372f14 | 248 | while ((unsigned int) cur_bitshift < len) |
252b5132 RH |
249 | { |
250 | if (len - cur_bitshift < FLOATFORMAT_CHAR_BIT) | |
251 | /* This is the last byte; zero out the bits which are not part of | |
252 | this field. */ | |
253 | result |= | |
254 | (*(data + cur_byte) & ((1 << (len - cur_bitshift)) - 1)) | |
255 | << cur_bitshift; | |
256 | else | |
257 | result |= *(data + cur_byte) << cur_bitshift; | |
258 | cur_bitshift += FLOATFORMAT_CHAR_BIT; | |
259 | if (order == floatformat_little) | |
260 | ++cur_byte; | |
261 | else | |
262 | --cur_byte; | |
263 | } | |
264 | return result; | |
265 | } | |
266 | ||
267 | #ifndef min | |
268 | #define min(a, b) ((a) < (b) ? (a) : (b)) | |
269 | #endif | |
270 | ||
271 | /* Convert from FMT to a double. | |
272 | FROM is the address of the extended float. | |
273 | Store the double in *TO. */ | |
274 | ||
275 | void | |
276 | floatformat_to_double (fmt, from, to) | |
277 | const struct floatformat *fmt; | |
34f4a113 | 278 | const char *from; |
252b5132 RH |
279 | double *to; |
280 | { | |
34f4a113 | 281 | const unsigned char *ufrom = (const unsigned char *)from; |
252b5132 RH |
282 | double dto; |
283 | long exponent; | |
284 | unsigned long mant; | |
285 | unsigned int mant_bits, mant_off; | |
286 | int mant_bits_left; | |
287 | int special_exponent; /* It's a NaN, denorm or zero */ | |
288 | ||
289 | exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize, | |
290 | fmt->exp_start, fmt->exp_len); | |
b52927b7 DD |
291 | |
292 | /* If the exponent indicates a NaN, we don't have information to | |
293 | decide what to do. So we handle it like IEEE, except that we | |
294 | don't try to preserve the type of NaN. FIXME. */ | |
295 | if ((unsigned long) exponent == fmt->exp_nan) | |
296 | { | |
297 | int nan; | |
298 | ||
299 | mant_off = fmt->man_start; | |
300 | mant_bits_left = fmt->man_len; | |
301 | nan = 0; | |
302 | while (mant_bits_left > 0) | |
303 | { | |
304 | mant_bits = min (mant_bits_left, 32); | |
305 | ||
306 | if (get_field (ufrom, fmt->byteorder, fmt->totalsize, | |
307 | mant_off, mant_bits) != 0) | |
308 | { | |
309 | /* This is a NaN. */ | |
310 | nan = 1; | |
311 | break; | |
312 | } | |
313 | ||
314 | mant_off += mant_bits; | |
315 | mant_bits_left -= mant_bits; | |
316 | } | |
317 | ||
318 | if (nan) | |
319 | dto = NAN; | |
320 | else | |
321 | dto = INFINITY; | |
322 | ||
323 | if (get_field (ufrom, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1)) | |
324 | dto = -dto; | |
325 | ||
326 | *to = dto; | |
327 | ||
328 | return; | |
329 | } | |
252b5132 RH |
330 | |
331 | mant_bits_left = fmt->man_len; | |
332 | mant_off = fmt->man_start; | |
333 | dto = 0.0; | |
334 | ||
08372f14 | 335 | special_exponent = exponent == 0 || (unsigned long) exponent == fmt->exp_nan; |
252b5132 RH |
336 | |
337 | /* Don't bias zero's, denorms or NaNs. */ | |
338 | if (!special_exponent) | |
339 | exponent -= fmt->exp_bias; | |
340 | ||
341 | /* Build the result algebraically. Might go infinite, underflow, etc; | |
342 | who cares. */ | |
343 | ||
344 | /* If this format uses a hidden bit, explicitly add it in now. Otherwise, | |
345 | increment the exponent by one to account for the integer bit. */ | |
346 | ||
347 | if (!special_exponent) | |
348 | { | |
349 | if (fmt->intbit == floatformat_intbit_no) | |
350 | dto = ldexp (1.0, exponent); | |
351 | else | |
352 | exponent++; | |
353 | } | |
354 | ||
355 | while (mant_bits_left > 0) | |
356 | { | |
357 | mant_bits = min (mant_bits_left, 32); | |
358 | ||
359 | mant = get_field (ufrom, fmt->byteorder, fmt->totalsize, | |
360 | mant_off, mant_bits); | |
361 | ||
b52927b7 DD |
362 | /* Handle denormalized numbers. FIXME: What should we do for |
363 | non-IEEE formats? */ | |
364 | if (exponent == 0 && mant != 0) | |
365 | dto += ldexp ((double)mant, | |
366 | (- fmt->exp_bias | |
367 | - mant_bits | |
368 | - (mant_off - fmt->man_start) | |
369 | + 1)); | |
370 | else | |
371 | dto += ldexp ((double)mant, exponent - mant_bits); | |
372 | if (exponent != 0) | |
373 | exponent -= mant_bits; | |
252b5132 RH |
374 | mant_off += mant_bits; |
375 | mant_bits_left -= mant_bits; | |
376 | } | |
377 | ||
378 | /* Negate it if negative. */ | |
379 | if (get_field (ufrom, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1)) | |
380 | dto = -dto; | |
381 | *to = dto; | |
382 | } | |
383 | \f | |
384 | static void put_field PARAMS ((unsigned char *, enum floatformat_byteorders, | |
385 | unsigned int, | |
386 | unsigned int, | |
387 | unsigned int, | |
388 | unsigned long)); | |
389 | ||
3f2aacaf | 390 | /* Set a field which starts at START and is LEN bits long. DATA and |
252b5132 RH |
391 | TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */ |
392 | static void | |
393 | put_field (data, order, total_len, start, len, stuff_to_put) | |
394 | unsigned char *data; | |
395 | enum floatformat_byteorders order; | |
396 | unsigned int total_len; | |
397 | unsigned int start; | |
398 | unsigned int len; | |
399 | unsigned long stuff_to_put; | |
400 | { | |
401 | unsigned int cur_byte; | |
402 | int cur_bitshift; | |
403 | ||
404 | /* Start at the least significant part of the field. */ | |
405 | cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT; | |
406 | if (order == floatformat_little) | |
407 | cur_byte = (total_len / FLOATFORMAT_CHAR_BIT) - cur_byte - 1; | |
408 | cur_bitshift = | |
409 | ((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT; | |
410 | *(data + cur_byte) &= | |
411 | ~(((1 << ((start + len) % FLOATFORMAT_CHAR_BIT)) - 1) << (-cur_bitshift)); | |
412 | *(data + cur_byte) |= | |
413 | (stuff_to_put & ((1 << FLOATFORMAT_CHAR_BIT) - 1)) << (-cur_bitshift); | |
414 | cur_bitshift += FLOATFORMAT_CHAR_BIT; | |
415 | if (order == floatformat_little) | |
416 | ++cur_byte; | |
417 | else | |
418 | --cur_byte; | |
419 | ||
420 | /* Move towards the most significant part of the field. */ | |
08372f14 | 421 | while ((unsigned int) cur_bitshift < len) |
252b5132 RH |
422 | { |
423 | if (len - cur_bitshift < FLOATFORMAT_CHAR_BIT) | |
424 | { | |
425 | /* This is the last byte. */ | |
426 | *(data + cur_byte) &= | |
427 | ~((1 << (len - cur_bitshift)) - 1); | |
428 | *(data + cur_byte) |= (stuff_to_put >> cur_bitshift); | |
429 | } | |
430 | else | |
431 | *(data + cur_byte) = ((stuff_to_put >> cur_bitshift) | |
432 | & ((1 << FLOATFORMAT_CHAR_BIT) - 1)); | |
433 | cur_bitshift += FLOATFORMAT_CHAR_BIT; | |
434 | if (order == floatformat_little) | |
435 | ++cur_byte; | |
436 | else | |
437 | --cur_byte; | |
438 | } | |
439 | } | |
440 | ||
441 | /* The converse: convert the double *FROM to an extended float | |
442 | and store where TO points. Neither FROM nor TO have any alignment | |
443 | restrictions. */ | |
444 | ||
445 | void | |
446 | floatformat_from_double (fmt, from, to) | |
447 | const struct floatformat *fmt; | |
34f4a113 | 448 | const double *from; |
252b5132 RH |
449 | char *to; |
450 | { | |
451 | double dfrom; | |
452 | int exponent; | |
453 | double mant; | |
454 | unsigned int mant_bits, mant_off; | |
455 | int mant_bits_left; | |
456 | unsigned char *uto = (unsigned char *)to; | |
457 | ||
b52927b7 | 458 | dfrom = *from; |
252b5132 | 459 | memset (uto, 0, fmt->totalsize / FLOATFORMAT_CHAR_BIT); |
b52927b7 DD |
460 | |
461 | /* If negative, set the sign bit. */ | |
462 | if (dfrom < 0) | |
463 | { | |
464 | put_field (uto, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1, 1); | |
465 | dfrom = -dfrom; | |
466 | } | |
467 | ||
252b5132 | 468 | if (dfrom == 0) |
b52927b7 DD |
469 | { |
470 | /* 0.0. */ | |
471 | return; | |
472 | } | |
473 | ||
252b5132 RH |
474 | if (dfrom != dfrom) |
475 | { | |
b52927b7 | 476 | /* NaN. */ |
252b5132 RH |
477 | put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, |
478 | fmt->exp_len, fmt->exp_nan); | |
b52927b7 | 479 | /* Be sure it's not infinity, but NaN value is irrelevant. */ |
252b5132 RH |
480 | put_field (uto, fmt->byteorder, fmt->totalsize, fmt->man_start, |
481 | 32, 1); | |
482 | return; | |
483 | } | |
484 | ||
b52927b7 | 485 | if (dfrom + dfrom == dfrom) |
252b5132 | 486 | { |
b52927b7 DD |
487 | /* This can only happen for an infinite value (or zero, which we |
488 | already handled above). */ | |
489 | put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, | |
490 | fmt->exp_len, fmt->exp_nan); | |
491 | return; | |
252b5132 RH |
492 | } |
493 | ||
252b5132 | 494 | mant = frexp (dfrom, &exponent); |
b52927b7 DD |
495 | if (exponent + fmt->exp_bias - 1 > 0) |
496 | put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, | |
497 | fmt->exp_len, exponent + fmt->exp_bias - 1); | |
498 | else | |
499 | { | |
500 | /* Handle a denormalized number. FIXME: What should we do for | |
501 | non-IEEE formats? */ | |
502 | put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, | |
503 | fmt->exp_len, 0); | |
504 | mant = ldexp (mant, exponent + fmt->exp_bias - 1); | |
505 | } | |
252b5132 RH |
506 | |
507 | mant_bits_left = fmt->man_len; | |
508 | mant_off = fmt->man_start; | |
509 | while (mant_bits_left > 0) | |
510 | { | |
511 | unsigned long mant_long; | |
512 | mant_bits = mant_bits_left < 32 ? mant_bits_left : 32; | |
513 | ||
514 | mant *= 4294967296.0; | |
515 | mant_long = (unsigned long)mant; | |
516 | mant -= mant_long; | |
517 | ||
b52927b7 DD |
518 | /* If the integer bit is implicit, and we are not creating a |
519 | denormalized number, then we need to discard it. */ | |
08372f14 | 520 | if ((unsigned int) mant_bits_left == fmt->man_len |
b52927b7 DD |
521 | && fmt->intbit == floatformat_intbit_no |
522 | && exponent + fmt->exp_bias - 1 > 0) | |
252b5132 RH |
523 | { |
524 | mant_long &= 0x7fffffff; | |
525 | mant_bits -= 1; | |
526 | } | |
527 | else if (mant_bits < 32) | |
528 | { | |
529 | /* The bits we want are in the most significant MANT_BITS bits of | |
530 | mant_long. Move them to the least significant. */ | |
531 | mant_long >>= 32 - mant_bits; | |
532 | } | |
533 | ||
534 | put_field (uto, fmt->byteorder, fmt->totalsize, | |
535 | mant_off, mant_bits, mant_long); | |
536 | mant_off += mant_bits; | |
537 | mant_bits_left -= mant_bits; | |
538 | } | |
539 | } | |
540 | ||
3f2aacaf DJ |
541 | /* Return non-zero iff the data at FROM is a valid number in format FMT. */ |
542 | ||
543 | int | |
544 | floatformat_is_valid (fmt, from) | |
545 | const struct floatformat *fmt; | |
34f4a113 | 546 | const char *from; |
3f2aacaf | 547 | { |
5324d185 | 548 | return fmt->is_valid (fmt, from); |
3f2aacaf DJ |
549 | } |
550 | ||
252b5132 RH |
551 | |
552 | #ifdef IEEE_DEBUG | |
553 | ||
b52927b7 DD |
554 | #include <stdio.h> |
555 | ||
252b5132 RH |
556 | /* This is to be run on a host which uses IEEE floating point. */ |
557 | ||
558 | void | |
559 | ieee_test (n) | |
560 | double n; | |
561 | { | |
562 | double result; | |
252b5132 | 563 | |
b52927b7 DD |
564 | floatformat_to_double (&floatformat_ieee_double_little, (char *) &n, |
565 | &result); | |
566 | if ((n != result && (! isnan (n) || ! isnan (result))) | |
567 | || (n < 0 && result >= 0) | |
568 | || (n >= 0 && result < 0)) | |
252b5132 | 569 | printf ("Differ(to): %.20g -> %.20g\n", n, result); |
b52927b7 DD |
570 | |
571 | floatformat_from_double (&floatformat_ieee_double_little, &n, | |
572 | (char *) &result); | |
573 | if ((n != result && (! isnan (n) || ! isnan (result))) | |
574 | || (n < 0 && result >= 0) | |
575 | || (n >= 0 && result < 0)) | |
252b5132 RH |
576 | printf ("Differ(from): %.20g -> %.20g\n", n, result); |
577 | ||
b52927b7 DD |
578 | #if 0 |
579 | { | |
580 | char exten[16]; | |
581 | ||
582 | floatformat_from_double (&floatformat_m68881_ext, &n, exten); | |
583 | floatformat_to_double (&floatformat_m68881_ext, exten, &result); | |
584 | if (n != result) | |
585 | printf ("Differ(to+from): %.20g -> %.20g\n", n, result); | |
586 | } | |
587 | #endif | |
252b5132 RH |
588 | |
589 | #if IEEE_DEBUG > 1 | |
590 | /* This is to be run on a host which uses 68881 format. */ | |
591 | { | |
592 | long double ex = *(long double *)exten; | |
593 | if (ex != n) | |
594 | printf ("Differ(from vs. extended): %.20g\n", n); | |
595 | } | |
596 | #endif | |
597 | } | |
598 | ||
599 | int | |
600 | main () | |
601 | { | |
b52927b7 | 602 | ieee_test (0.0); |
252b5132 RH |
603 | ieee_test (0.5); |
604 | ieee_test (256.0); | |
605 | ieee_test (0.12345); | |
606 | ieee_test (234235.78907234); | |
607 | ieee_test (-512.0); | |
608 | ieee_test (-0.004321); | |
b52927b7 DD |
609 | ieee_test (1.2E-70); |
610 | ieee_test (1.2E-316); | |
611 | ieee_test (4.9406564584124654E-324); | |
612 | ieee_test (- 4.9406564584124654E-324); | |
613 | ieee_test (- 0.0); | |
614 | ieee_test (- INFINITY); | |
615 | ieee_test (- NAN); | |
616 | ieee_test (INFINITY); | |
617 | ieee_test (NAN); | |
252b5132 RH |
618 | return 0; |
619 | } | |
620 | #endif |