Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) | |
3 | * | |
4 | * Floating-point emulation code | |
5 | * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2, or (at your option) | |
10 | * any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | /* | |
22 | * BEGIN_DESC | |
23 | * | |
24 | * File: | |
25 | * @(#) pa/spmath/fcnvfu.c $Revision: 1.1 $ | |
26 | * | |
27 | * Purpose: | |
28 | * Floating-point to Unsigned Fixed-point Converts | |
29 | * | |
30 | * External Interfaces: | |
31 | * dbl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status) | |
32 | * dbl_to_sgl_fcnvfu(srcptr,nullptr,dstptr,status) | |
33 | * sgl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status) | |
34 | * sgl_to_sgl_fcnvfu(srcptr,nullptr,dstptr,status) | |
35 | * | |
36 | * Internal Interfaces: | |
37 | * | |
38 | * Theory: | |
39 | * <<please update with a overview of the operation of this file>> | |
40 | * | |
41 | * END_DESC | |
42 | */ | |
43 | ||
44 | ||
45 | #include "float.h" | |
46 | #include "sgl_float.h" | |
47 | #include "dbl_float.h" | |
48 | #include "cnv_float.h" | |
49 | ||
50 | /************************************************************************ | |
51 | * Floating-point to Unsigned Fixed-point Converts * | |
52 | ************************************************************************/ | |
53 | ||
54 | /* | |
55 | * Single Floating-point to Single Unsigned Fixed | |
56 | */ | |
57 | /*ARGSUSED*/ | |
58 | int | |
59 | sgl_to_sgl_fcnvfu( | |
60 | sgl_floating_point *srcptr, | |
61 | unsigned int *nullptr, | |
62 | unsigned int *dstptr, | |
63 | unsigned int *status) | |
64 | { | |
65 | register unsigned int src, result; | |
66 | register int src_exponent; | |
67 | register boolean inexact = FALSE; | |
68 | ||
69 | src = *srcptr; | |
70 | src_exponent = Sgl_exponent(src) - SGL_BIAS; | |
71 | ||
72 | /* | |
73 | * Test for overflow | |
74 | */ | |
75 | if (src_exponent > SGL_FX_MAX_EXP + 1) { | |
76 | if (Sgl_isone_sign(src)) { | |
77 | result = 0; | |
78 | } else { | |
79 | result = 0xffffffff; | |
80 | } | |
81 | if (Is_invalidtrap_enabled()) { | |
82 | return(INVALIDEXCEPTION); | |
83 | } | |
84 | Set_invalidflag(); | |
85 | *dstptr = result; | |
86 | return(NOEXCEPTION); | |
87 | } | |
88 | /* | |
89 | * Generate result | |
90 | */ | |
91 | if (src_exponent >= 0) { | |
92 | /* | |
93 | * Check sign. | |
94 | * If negative, trap unimplemented. | |
95 | */ | |
96 | if (Sgl_isone_sign(src)) { | |
97 | result = 0; | |
98 | if (Is_invalidtrap_enabled()) { | |
99 | return(INVALIDEXCEPTION); | |
100 | } | |
101 | Set_invalidflag(); | |
102 | *dstptr = result; | |
103 | return(NOEXCEPTION); | |
104 | } | |
105 | Sgl_clear_signexponent_set_hidden(src); | |
106 | Suint_from_sgl_mantissa(src,src_exponent,result); | |
107 | ||
108 | /* check for inexact */ | |
109 | if (Sgl_isinexact_to_unsigned(src,src_exponent)) { | |
110 | inexact = TRUE; | |
111 | /* round result */ | |
112 | switch (Rounding_mode()) { | |
113 | case ROUNDPLUS: | |
114 | result++; | |
115 | break; | |
116 | case ROUNDMINUS: /* never negative */ | |
117 | break; | |
118 | case ROUNDNEAREST: | |
119 | if (Sgl_isone_roundbit(src,src_exponent) && | |
120 | (Sgl_isone_stickybit(src,src_exponent) || | |
121 | (result & 1))) { | |
122 | result++; | |
123 | } | |
124 | break; | |
125 | } | |
126 | } | |
127 | } else { | |
128 | result = 0; | |
129 | ||
130 | /* check for inexact */ | |
131 | if (Sgl_isnotzero_exponentmantissa(src)) { | |
132 | inexact = TRUE; | |
133 | /* round result */ | |
134 | switch (Rounding_mode()) { | |
135 | case ROUNDPLUS: | |
136 | if (Sgl_iszero_sign(src)) { | |
137 | result++; | |
138 | } | |
139 | break; | |
140 | case ROUNDMINUS: | |
141 | if (Sgl_isone_sign(src)) { | |
142 | result = 0; | |
143 | if (Is_invalidtrap_enabled()) { | |
144 | return(INVALIDEXCEPTION); | |
145 | } | |
146 | Set_invalidflag(); | |
147 | inexact = FALSE; | |
148 | } | |
149 | break; | |
150 | case ROUNDNEAREST: | |
151 | if (src_exponent == -1 && | |
152 | Sgl_isnotzero_mantissa(src)) { | |
153 | if (Sgl_isone_sign(src)) { | |
154 | result = 0; | |
155 | if (Is_invalidtrap_enabled()) { | |
156 | return(INVALIDEXCEPTION); | |
157 | } | |
158 | Set_invalidflag(); | |
159 | inexact = FALSE; | |
160 | } | |
161 | else result++; | |
162 | } | |
163 | break; | |
164 | } | |
165 | } | |
166 | } | |
167 | *dstptr = result; | |
168 | if (inexact) { | |
169 | if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); | |
170 | else Set_inexactflag(); | |
171 | } | |
172 | return(NOEXCEPTION); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Single Floating-point to Double Unsigned Fixed | |
177 | */ | |
178 | /*ARGSUSED*/ | |
179 | int | |
180 | sgl_to_dbl_fcnvfu( | |
181 | sgl_floating_point *srcptr, | |
182 | unsigned int *nullptr, | |
183 | dbl_unsigned *dstptr, | |
184 | unsigned int *status) | |
185 | { | |
186 | register int src_exponent; | |
187 | register unsigned int src, resultp1, resultp2; | |
188 | register boolean inexact = FALSE; | |
189 | ||
190 | src = *srcptr; | |
191 | src_exponent = Sgl_exponent(src) - SGL_BIAS; | |
192 | ||
193 | /* | |
194 | * Test for overflow | |
195 | */ | |
196 | if (src_exponent > DBL_FX_MAX_EXP + 1) { | |
197 | if (Sgl_isone_sign(src)) { | |
198 | resultp1 = resultp2 = 0; | |
199 | } else { | |
200 | resultp1 = resultp2 = 0xffffffff; | |
201 | } | |
202 | if (Is_invalidtrap_enabled()) { | |
203 | return(INVALIDEXCEPTION); | |
204 | } | |
205 | Set_invalidflag(); | |
206 | Duint_copytoptr(resultp1,resultp2,dstptr); | |
207 | return(NOEXCEPTION); | |
208 | } | |
209 | /* | |
210 | * Generate result | |
211 | */ | |
212 | if (src_exponent >= 0) { | |
213 | /* | |
214 | * Check sign. | |
215 | * If negative, trap unimplemented. | |
216 | */ | |
217 | if (Sgl_isone_sign(src)) { | |
218 | resultp1 = resultp2 = 0; | |
219 | if (Is_invalidtrap_enabled()) { | |
220 | return(INVALIDEXCEPTION); | |
221 | } | |
222 | Set_invalidflag(); | |
223 | Duint_copytoptr(resultp1,resultp2,dstptr); | |
224 | return(NOEXCEPTION); | |
225 | } | |
226 | Sgl_clear_signexponent_set_hidden(src); | |
227 | Duint_from_sgl_mantissa(src,src_exponent,resultp1,resultp2); | |
228 | ||
229 | /* check for inexact */ | |
230 | if (Sgl_isinexact_to_unsigned(src,src_exponent)) { | |
231 | inexact = TRUE; | |
232 | /* round result */ | |
233 | switch (Rounding_mode()) { | |
234 | case ROUNDPLUS: | |
235 | Duint_increment(resultp1,resultp2); | |
236 | break; | |
237 | case ROUNDMINUS: /* never negative */ | |
238 | break; | |
239 | case ROUNDNEAREST: | |
240 | if (Sgl_isone_roundbit(src,src_exponent) && | |
241 | (Sgl_isone_stickybit(src,src_exponent) || | |
242 | Duint_isone_lowp2(resultp2))) { | |
243 | Duint_increment(resultp1,resultp2); | |
244 | } | |
245 | break; | |
246 | } | |
247 | } | |
248 | } else { | |
249 | Duint_setzero(resultp1,resultp2); | |
250 | ||
251 | /* check for inexact */ | |
252 | if (Sgl_isnotzero_exponentmantissa(src)) { | |
253 | inexact = TRUE; | |
254 | /* round result */ | |
255 | switch (Rounding_mode()) { | |
256 | case ROUNDPLUS: | |
257 | if (Sgl_iszero_sign(src)) { | |
258 | Duint_increment(resultp1,resultp2); | |
259 | } | |
260 | break; | |
261 | case ROUNDMINUS: | |
262 | if (Sgl_isone_sign(src)) { | |
263 | resultp1 = resultp2 = 0; | |
264 | if (Is_invalidtrap_enabled()) { | |
265 | return(INVALIDEXCEPTION); | |
266 | } | |
267 | Set_invalidflag(); | |
268 | inexact = FALSE; | |
269 | } | |
270 | break; | |
271 | case ROUNDNEAREST: | |
272 | if (src_exponent == -1 && | |
273 | Sgl_isnotzero_mantissa(src)) { | |
274 | if (Sgl_isone_sign(src)) { | |
275 | resultp1 = 0; | |
276 | resultp2 = 0; | |
277 | if (Is_invalidtrap_enabled()) { | |
278 | return(INVALIDEXCEPTION); | |
279 | } | |
280 | Set_invalidflag(); | |
281 | inexact = FALSE; | |
282 | } | |
283 | else Duint_increment(resultp1,resultp2); | |
284 | } | |
285 | } | |
286 | } | |
287 | } | |
288 | Duint_copytoptr(resultp1,resultp2,dstptr); | |
289 | if (inexact) { | |
290 | if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); | |
291 | else Set_inexactflag(); | |
292 | } | |
293 | return(NOEXCEPTION); | |
294 | } | |
295 | ||
296 | /* | |
297 | * Double Floating-point to Single Unsigned Fixed | |
298 | */ | |
299 | /*ARGSUSED*/ | |
300 | int | |
301 | dbl_to_sgl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr, | |
302 | unsigned int *dstptr, unsigned int *status) | |
303 | { | |
304 | register unsigned int srcp1, srcp2, result; | |
305 | register int src_exponent; | |
306 | register boolean inexact = FALSE; | |
307 | ||
308 | Dbl_copyfromptr(srcptr,srcp1,srcp2); | |
309 | src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; | |
310 | ||
311 | /* | |
312 | * Test for overflow | |
313 | */ | |
314 | if (src_exponent > SGL_FX_MAX_EXP + 1) { | |
315 | if (Dbl_isone_sign(srcp1)) { | |
316 | result = 0; | |
317 | } else { | |
318 | result = 0xffffffff; | |
319 | } | |
320 | if (Is_invalidtrap_enabled()) { | |
321 | return(INVALIDEXCEPTION); | |
322 | } | |
323 | Set_invalidflag(); | |
324 | *dstptr = result; | |
325 | return(NOEXCEPTION); | |
326 | } | |
327 | /* | |
328 | * Generate result | |
329 | */ | |
330 | if (src_exponent >= 0) { | |
331 | /* | |
332 | * Check sign. | |
333 | * If negative, trap unimplemented. | |
334 | */ | |
335 | if (Dbl_isone_sign(srcp1)) { | |
336 | result = 0; | |
337 | if (Is_invalidtrap_enabled()) { | |
338 | return(INVALIDEXCEPTION); | |
339 | } | |
340 | Set_invalidflag(); | |
341 | *dstptr = result; | |
342 | return(NOEXCEPTION); | |
343 | } | |
344 | Dbl_clear_signexponent_set_hidden(srcp1); | |
345 | Suint_from_dbl_mantissa(srcp1,srcp2,src_exponent,result); | |
346 | ||
347 | /* check for inexact */ | |
348 | if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) { | |
349 | inexact = TRUE; | |
350 | /* round result */ | |
351 | switch (Rounding_mode()) { | |
352 | case ROUNDPLUS: | |
353 | result++; | |
354 | break; | |
355 | case ROUNDMINUS: /* never negative */ | |
356 | break; | |
357 | case ROUNDNEAREST: | |
358 | if(Dbl_isone_roundbit(srcp1,srcp2,src_exponent) && | |
359 | (Dbl_isone_stickybit(srcp1,srcp2,src_exponent)|| | |
360 | result&1)) | |
361 | result++; | |
362 | break; | |
363 | } | |
364 | /* check for overflow */ | |
365 | if (result == 0) { | |
366 | result = 0xffffffff; | |
367 | if (Is_invalidtrap_enabled()) { | |
368 | return(INVALIDEXCEPTION); | |
369 | } | |
370 | Set_invalidflag(); | |
371 | *dstptr = result; | |
372 | return(NOEXCEPTION); | |
373 | } | |
374 | } | |
375 | } else { | |
376 | result = 0; | |
377 | ||
378 | /* check for inexact */ | |
379 | if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { | |
380 | inexact = TRUE; | |
381 | /* round result */ | |
382 | switch (Rounding_mode()) { | |
383 | case ROUNDPLUS: | |
384 | if (Dbl_iszero_sign(srcp1)) result++; | |
385 | break; | |
386 | case ROUNDMINUS: | |
387 | if (Dbl_isone_sign(srcp1)) { | |
388 | result = 0; | |
389 | if (Is_invalidtrap_enabled()) { | |
390 | return(INVALIDEXCEPTION); | |
391 | } | |
392 | Set_invalidflag(); | |
393 | inexact = FALSE; | |
394 | } | |
395 | break; | |
396 | case ROUNDNEAREST: | |
397 | if (src_exponent == -1 && | |
398 | Dbl_isnotzero_mantissa(srcp1,srcp2)) | |
399 | if (Dbl_isone_sign(srcp1)) { | |
400 | result = 0; | |
401 | if (Is_invalidtrap_enabled()) { | |
402 | return(INVALIDEXCEPTION); | |
403 | } | |
404 | Set_invalidflag(); | |
405 | inexact = FALSE; | |
406 | } | |
407 | else result++; | |
408 | } | |
409 | } | |
410 | } | |
411 | *dstptr = result; | |
412 | if (inexact) { | |
413 | if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); | |
414 | else Set_inexactflag(); | |
415 | } | |
416 | return(NOEXCEPTION); | |
417 | } | |
418 | ||
419 | /* | |
420 | * Double Floating-point to Double Unsigned Fixed | |
421 | */ | |
422 | /*ARGSUSED*/ | |
423 | int | |
424 | dbl_to_dbl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr, | |
425 | dbl_unsigned * dstptr, unsigned int *status) | |
426 | { | |
427 | register int src_exponent; | |
428 | register unsigned int srcp1, srcp2, resultp1, resultp2; | |
429 | register boolean inexact = FALSE; | |
430 | ||
431 | Dbl_copyfromptr(srcptr,srcp1,srcp2); | |
432 | src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; | |
433 | ||
434 | /* | |
435 | * Test for overflow | |
436 | */ | |
437 | if (src_exponent > DBL_FX_MAX_EXP + 1) { | |
438 | if (Dbl_isone_sign(srcp1)) { | |
439 | resultp1 = resultp2 = 0; | |
440 | } else { | |
441 | resultp1 = resultp2 = 0xffffffff; | |
442 | } | |
443 | if (Is_invalidtrap_enabled()) { | |
444 | return(INVALIDEXCEPTION); | |
445 | } | |
446 | Set_invalidflag(); | |
447 | Duint_copytoptr(resultp1,resultp2,dstptr); | |
448 | return(NOEXCEPTION); | |
449 | } | |
450 | ||
451 | /* | |
452 | * Generate result | |
453 | */ | |
454 | if (src_exponent >= 0) { | |
455 | /* | |
456 | * Check sign. | |
457 | * If negative, trap unimplemented. | |
458 | */ | |
459 | if (Dbl_isone_sign(srcp1)) { | |
460 | resultp1 = resultp2 = 0; | |
461 | if (Is_invalidtrap_enabled()) { | |
462 | return(INVALIDEXCEPTION); | |
463 | } | |
464 | Set_invalidflag(); | |
465 | Duint_copytoptr(resultp1,resultp2,dstptr); | |
466 | return(NOEXCEPTION); | |
467 | } | |
468 | Dbl_clear_signexponent_set_hidden(srcp1); | |
469 | Duint_from_dbl_mantissa(srcp1,srcp2,src_exponent,resultp1, | |
470 | resultp2); | |
471 | ||
472 | /* check for inexact */ | |
473 | if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) { | |
474 | inexact = TRUE; | |
475 | /* round result */ | |
476 | switch (Rounding_mode()) { | |
477 | case ROUNDPLUS: | |
478 | Duint_increment(resultp1,resultp2); | |
479 | break; | |
480 | case ROUNDMINUS: /* never negative */ | |
481 | break; | |
482 | case ROUNDNEAREST: | |
483 | if(Dbl_isone_roundbit(srcp1,srcp2,src_exponent)) | |
484 | if(Dbl_isone_stickybit(srcp1,srcp2,src_exponent) || | |
485 | Duint_isone_lowp2(resultp2)) | |
486 | Duint_increment(resultp1,resultp2); | |
487 | } | |
488 | } | |
489 | } else { | |
490 | Duint_setzero(resultp1,resultp2); | |
491 | ||
492 | /* check for inexact */ | |
493 | if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { | |
494 | inexact = TRUE; | |
495 | /* round result */ | |
496 | switch (Rounding_mode()) { | |
497 | case ROUNDPLUS: | |
498 | if (Dbl_iszero_sign(srcp1)) { | |
499 | Duint_increment(resultp1,resultp2); | |
500 | } | |
501 | break; | |
502 | case ROUNDMINUS: | |
503 | if (Dbl_isone_sign(srcp1)) { | |
504 | resultp1 = resultp2 = 0; | |
505 | if (Is_invalidtrap_enabled()) { | |
506 | return(INVALIDEXCEPTION); | |
507 | } | |
508 | Set_invalidflag(); | |
509 | inexact = FALSE; | |
510 | } | |
511 | break; | |
512 | case ROUNDNEAREST: | |
513 | if (src_exponent == -1 && | |
514 | Dbl_isnotzero_mantissa(srcp1,srcp2)) | |
515 | if (Dbl_iszero_sign(srcp1)) { | |
516 | Duint_increment(resultp1,resultp2); | |
517 | } else { | |
518 | resultp1 = 0; | |
519 | resultp2 = 0; | |
520 | if (Is_invalidtrap_enabled()) { | |
521 | return(INVALIDEXCEPTION); | |
522 | } | |
523 | Set_invalidflag(); | |
524 | inexact = FALSE; | |
525 | } | |
526 | } | |
527 | } | |
528 | } | |
529 | Duint_copytoptr(resultp1,resultp2,dstptr); | |
530 | if (inexact) { | |
531 | if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); | |
532 | else Set_inexactflag(); | |
533 | } | |
534 | return(NOEXCEPTION); | |
535 | } | |
536 |