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985b6196 | 1 | /* real.c - implementation of REAL_ARITHMETIC, REAL_VALUE_ATOF, |
29e11dab | 2 | and support for XFmode IEEE extended real floating point arithmetic. |
f5963e61 | 3 | Copyright (C) 1993, 94, 95, 96, 97, 1998 Free Software Foundation, Inc. |
c764eafd | 4 | Contributed by Stephen L. Moshier (moshier@world.std.com). |
985b6196 RS |
5 | |
6 | This file is part of GNU CC. | |
7 | ||
8 | GNU CC is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GNU CC is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GNU CC; see the file COPYING. If not, write to | |
e99215a3 RK |
20 | the Free Software Foundation, 59 Temple Place - Suite 330, |
21 | Boston, MA 02111-1307, USA. */ | |
985b6196 | 22 | |
e9a25f70 | 23 | #include "config.h" |
670ee920 | 24 | #include "system.h" |
985b6196 | 25 | #include "tree.h" |
10f0ad3d | 26 | #include "toplev.h" |
985b6196 RS |
27 | |
28 | /* To enable support of XFmode extended real floating point, define | |
29 | LONG_DOUBLE_TYPE_SIZE 96 in the tm.h file (m68k.h or i386.h). | |
30 | ||
842fbaaa | 31 | To support cross compilation between IEEE, VAX and IBM floating |
985b6196 RS |
32 | point formats, define REAL_ARITHMETIC in the tm.h file. |
33 | ||
34 | In either case the machine files (tm.h) must not contain any code | |
35 | that tries to use host floating point arithmetic to convert | |
36 | REAL_VALUE_TYPEs from `double' to `float', pass them to fprintf, | |
37 | etc. In cross-compile situations a REAL_VALUE_TYPE may not | |
38 | be intelligible to the host computer's native arithmetic. | |
39 | ||
40 | The emulator defaults to the host's floating point format so that | |
41 | its decimal conversion functions can be used if desired (see | |
42 | real.h). | |
43 | ||
8c35bbc5 RK |
44 | The first part of this file interfaces gcc to a floating point |
45 | arithmetic suite that was not written with gcc in mind. Avoid | |
46 | changing the low-level arithmetic routines unless you have suitable | |
47 | test programs available. A special version of the PARANOIA floating | |
48 | point arithmetic tester, modified for this purpose, can be found on | |
49 | usc.edu: /pub/C-numanal/ieeetest.zoo. Other tests, and libraries of | |
50 | XFmode and TFmode transcendental functions, can be obtained by ftp from | |
51 | netlib.att.com: netlib/cephes. */ | |
775ba35d | 52 | \f |
985b6196 | 53 | /* Type of computer arithmetic. |
f76b9db2 ILT |
54 | Only one of DEC, IBM, IEEE, or UNK should get defined. |
55 | ||
8c35bbc5 | 56 | `IEEE', when REAL_WORDS_BIG_ENDIAN is non-zero, refers generically |
f76b9db2 ILT |
57 | to big-endian IEEE floating-point data structure. This definition |
58 | should work in SFmode `float' type and DFmode `double' type on | |
59 | virtually all big-endian IEEE machines. If LONG_DOUBLE_TYPE_SIZE | |
60 | has been defined to be 96, then IEEE also invokes the particular | |
61 | XFmode (`long double' type) data structure used by the Motorola | |
62 | 680x0 series processors. | |
63 | ||
8c35bbc5 | 64 | `IEEE', when REAL_WORDS_BIG_ENDIAN is zero, refers generally to |
f76b9db2 ILT |
65 | little-endian IEEE machines. In this case, if LONG_DOUBLE_TYPE_SIZE |
66 | has been defined to be 96, then IEEE also invokes the particular | |
67 | XFmode `long double' data structure used by the Intel 80x86 series | |
68 | processors. | |
66b6d60b RS |
69 | |
70 | `DEC' refers specifically to the Digital Equipment Corp PDP-11 | |
71 | and VAX floating point data structure. This model currently | |
72 | supports no type wider than DFmode. | |
73 | ||
842fbaaa JW |
74 | `IBM' refers specifically to the IBM System/370 and compatible |
75 | floating point data structure. This model currently supports | |
76 | no type wider than DFmode. The IBM conversions were contributed by | |
77 | frank@atom.ansto.gov.au (Frank Crawford). | |
78 | ||
66b6d60b RS |
79 | If LONG_DOUBLE_TYPE_SIZE = 64 (the default, unless tm.h defines it) |
80 | then `long double' and `double' are both implemented, but they | |
81 | both mean DFmode. In this case, the software floating-point | |
82 | support available here is activated by writing | |
83 | #define REAL_ARITHMETIC | |
84 | in tm.h. | |
85 | ||
86 | The case LONG_DOUBLE_TYPE_SIZE = 128 activates TFmode support | |
842fbaaa | 87 | and may deactivate XFmode since `long double' is used to refer |
b51ab098 RK |
88 | to both modes. |
89 | ||
90 | The macros FLOAT_WORDS_BIG_ENDIAN, HOST_FLOAT_WORDS_BIG_ENDIAN, | |
91 | contributed by Richard Earnshaw <Richard.Earnshaw@cl.cam.ac.uk>, | |
92 | separate the floating point unit's endian-ness from that of | |
93 | the integer addressing. This permits one to define a big-endian | |
94 | FPU on a little-endian machine (e.g., ARM). An extension to | |
95 | BYTES_BIG_ENDIAN may be required for some machines in the future. | |
96 | These optional macros may be defined in tm.h. In real.h, they | |
97 | default to WORDS_BIG_ENDIAN, etc., so there is no need to define | |
98 | them for any normal host or target machine on which the floats | |
99 | and the integers have the same endian-ness. */ | |
100 | ||
66b6d60b RS |
101 | |
102 | /* The following converts gcc macros into the ones used by this file. */ | |
103 | ||
985b6196 RS |
104 | /* REAL_ARITHMETIC defined means that macros in real.h are |
105 | defined to call emulator functions. */ | |
106 | #ifdef REAL_ARITHMETIC | |
107 | ||
108 | #if TARGET_FLOAT_FORMAT == VAX_FLOAT_FORMAT | |
109 | /* PDP-11, Pro350, VAX: */ | |
110 | #define DEC 1 | |
111 | #else /* it's not VAX */ | |
842fbaaa JW |
112 | #if TARGET_FLOAT_FORMAT == IBM_FLOAT_FORMAT |
113 | /* IBM System/370 style */ | |
114 | #define IBM 1 | |
115 | #else /* it's also not an IBM */ | |
f5963e61 JL |
116 | #if TARGET_FLOAT_FORMAT == C4X_FLOAT_FORMAT |
117 | /* TMS320C3x/C4x style */ | |
118 | #define C4X 1 | |
119 | #else /* it's also not a C4X */ | |
985b6196 | 120 | #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT |
f76b9db2 | 121 | #define IEEE |
985b6196 | 122 | #else /* it's not IEEE either */ |
0f41302f | 123 | /* UNKnown arithmetic. We don't support this and can't go on. */ |
985b6196 RS |
124 | unknown arithmetic type |
125 | #define UNK 1 | |
126 | #endif /* not IEEE */ | |
f5963e61 | 127 | #endif /* not C4X */ |
842fbaaa | 128 | #endif /* not IBM */ |
985b6196 RS |
129 | #endif /* not VAX */ |
130 | ||
8c35bbc5 RK |
131 | #define REAL_WORDS_BIG_ENDIAN FLOAT_WORDS_BIG_ENDIAN |
132 | ||
985b6196 RS |
133 | #else |
134 | /* REAL_ARITHMETIC not defined means that the *host's* data | |
135 | structure will be used. It may differ by endian-ness from the | |
136 | target machine's structure and will get its ends swapped | |
137 | accordingly (but not here). Probably only the decimal <-> binary | |
138 | functions in this file will actually be used in this case. */ | |
defb5dab | 139 | |
985b6196 RS |
140 | #if HOST_FLOAT_FORMAT == VAX_FLOAT_FORMAT |
141 | #define DEC 1 | |
142 | #else /* it's not VAX */ | |
842fbaaa JW |
143 | #if HOST_FLOAT_FORMAT == IBM_FLOAT_FORMAT |
144 | /* IBM System/370 style */ | |
145 | #define IBM 1 | |
146 | #else /* it's also not an IBM */ | |
985b6196 | 147 | #if HOST_FLOAT_FORMAT == IEEE_FLOAT_FORMAT |
f76b9db2 | 148 | #define IEEE |
985b6196 RS |
149 | #else /* it's not IEEE either */ |
150 | unknown arithmetic type | |
151 | #define UNK 1 | |
152 | #endif /* not IEEE */ | |
842fbaaa | 153 | #endif /* not IBM */ |
985b6196 RS |
154 | #endif /* not VAX */ |
155 | ||
8c35bbc5 RK |
156 | #define REAL_WORDS_BIG_ENDIAN HOST_FLOAT_WORDS_BIG_ENDIAN |
157 | ||
985b6196 RS |
158 | #endif /* REAL_ARITHMETIC not defined */ |
159 | ||
66b6d60b RS |
160 | /* Define INFINITY for support of infinity. |
161 | Define NANS for support of Not-a-Number's (NaN's). */ | |
f5963e61 | 162 | #if !defined(DEC) && !defined(IBM) && !defined(C4X) |
985b6196 | 163 | #define INFINITY |
66b6d60b | 164 | #define NANS |
985b6196 RS |
165 | #endif |
166 | ||
0f41302f | 167 | /* Support of NaNs requires support of infinity. */ |
66b6d60b RS |
168 | #ifdef NANS |
169 | #ifndef INFINITY | |
170 | #define INFINITY | |
171 | #endif | |
172 | #endif | |
775ba35d | 173 | \f |
985b6196 | 174 | /* Find a host integer type that is at least 16 bits wide, |
0f41302f | 175 | and another type at least twice whatever that size is. */ |
985b6196 RS |
176 | |
177 | #if HOST_BITS_PER_CHAR >= 16 | |
178 | #define EMUSHORT char | |
179 | #define EMUSHORT_SIZE HOST_BITS_PER_CHAR | |
180 | #define EMULONG_SIZE (2 * HOST_BITS_PER_CHAR) | |
181 | #else | |
182 | #if HOST_BITS_PER_SHORT >= 16 | |
183 | #define EMUSHORT short | |
184 | #define EMUSHORT_SIZE HOST_BITS_PER_SHORT | |
185 | #define EMULONG_SIZE (2 * HOST_BITS_PER_SHORT) | |
186 | #else | |
187 | #if HOST_BITS_PER_INT >= 16 | |
188 | #define EMUSHORT int | |
189 | #define EMUSHORT_SIZE HOST_BITS_PER_INT | |
190 | #define EMULONG_SIZE (2 * HOST_BITS_PER_INT) | |
191 | #else | |
192 | #if HOST_BITS_PER_LONG >= 16 | |
193 | #define EMUSHORT long | |
194 | #define EMUSHORT_SIZE HOST_BITS_PER_LONG | |
195 | #define EMULONG_SIZE (2 * HOST_BITS_PER_LONG) | |
196 | #else | |
0f41302f | 197 | /* You will have to modify this program to have a smaller unit size. */ |
985b6196 RS |
198 | #define EMU_NON_COMPILE |
199 | #endif | |
200 | #endif | |
201 | #endif | |
202 | #endif | |
203 | ||
204 | #if HOST_BITS_PER_SHORT >= EMULONG_SIZE | |
205 | #define EMULONG short | |
206 | #else | |
207 | #if HOST_BITS_PER_INT >= EMULONG_SIZE | |
208 | #define EMULONG int | |
209 | #else | |
210 | #if HOST_BITS_PER_LONG >= EMULONG_SIZE | |
211 | #define EMULONG long | |
212 | #else | |
e9a25f70 | 213 | #if HOST_BITS_PER_LONGLONG >= EMULONG_SIZE |
985b6196 RS |
214 | #define EMULONG long long int |
215 | #else | |
0f41302f | 216 | /* You will have to modify this program to have a smaller unit size. */ |
985b6196 RS |
217 | #define EMU_NON_COMPILE |
218 | #endif | |
219 | #endif | |
220 | #endif | |
221 | #endif | |
222 | ||
223 | ||
0f41302f | 224 | /* The host interface doesn't work if no 16-bit size exists. */ |
985b6196 RS |
225 | #if EMUSHORT_SIZE != 16 |
226 | #define EMU_NON_COMPILE | |
227 | #endif | |
228 | ||
0f41302f | 229 | /* OK to continue compilation. */ |
985b6196 RS |
230 | #ifndef EMU_NON_COMPILE |
231 | ||
232 | /* Construct macros to translate between REAL_VALUE_TYPE and e type. | |
233 | In GET_REAL and PUT_REAL, r and e are pointers. | |
234 | A REAL_VALUE_TYPE is guaranteed to occupy contiguous locations | |
235 | in memory, with no holes. */ | |
236 | ||
237 | #if LONG_DOUBLE_TYPE_SIZE == 96 | |
842fbaaa JW |
238 | /* Number of 16 bit words in external e type format */ |
239 | #define NE 6 | |
240 | #define MAXDECEXP 4932 | |
241 | #define MINDECEXP -4956 | |
4ba46f43 RK |
242 | #define GET_REAL(r,e) bcopy ((char *) r, (char *) e, 2*NE) |
243 | #define PUT_REAL(e,r) bcopy ((char *) e, (char *) r, 2*NE) | |
985b6196 | 244 | #else /* no XFmode */ |
842fbaaa JW |
245 | #if LONG_DOUBLE_TYPE_SIZE == 128 |
246 | #define NE 10 | |
247 | #define MAXDECEXP 4932 | |
248 | #define MINDECEXP -4977 | |
4ba46f43 RK |
249 | #define GET_REAL(r,e) bcopy ((char *) r, (char *) e, 2*NE) |
250 | #define PUT_REAL(e,r) bcopy ((char *) e, (char *) r, 2*NE) | |
842fbaaa JW |
251 | #else |
252 | #define NE 6 | |
253 | #define MAXDECEXP 4932 | |
254 | #define MINDECEXP -4956 | |
985b6196 RS |
255 | #ifdef REAL_ARITHMETIC |
256 | /* Emulator uses target format internally | |
0f41302f | 257 | but host stores it in host endian-ness. */ |
985b6196 | 258 | |
f76b9db2 ILT |
259 | #define GET_REAL(r,e) \ |
260 | do { \ | |
8c35bbc5 | 261 | if (HOST_FLOAT_WORDS_BIG_ENDIAN == REAL_WORDS_BIG_ENDIAN) \ |
0f41302f | 262 | e53toe ((unsigned EMUSHORT *) (r), (e)); \ |
f76b9db2 ILT |
263 | else \ |
264 | { \ | |
265 | unsigned EMUSHORT w[4]; \ | |
266 | w[3] = ((EMUSHORT *) r)[0]; \ | |
267 | w[2] = ((EMUSHORT *) r)[1]; \ | |
268 | w[1] = ((EMUSHORT *) r)[2]; \ | |
269 | w[0] = ((EMUSHORT *) r)[3]; \ | |
270 | e53toe (w, (e)); \ | |
271 | } \ | |
272 | } while (0) | |
273 | ||
274 | #define PUT_REAL(e,r) \ | |
275 | do { \ | |
8c35bbc5 | 276 | if (HOST_FLOAT_WORDS_BIG_ENDIAN == REAL_WORDS_BIG_ENDIAN) \ |
f76b9db2 ILT |
277 | etoe53 ((e), (unsigned EMUSHORT *) (r)); \ |
278 | else \ | |
279 | { \ | |
280 | unsigned EMUSHORT w[4]; \ | |
281 | etoe53 ((e), w); \ | |
282 | *((EMUSHORT *) r) = w[3]; \ | |
283 | *((EMUSHORT *) r + 1) = w[2]; \ | |
284 | *((EMUSHORT *) r + 2) = w[1]; \ | |
285 | *((EMUSHORT *) r + 3) = w[0]; \ | |
286 | } \ | |
287 | } while (0) | |
985b6196 RS |
288 | |
289 | #else /* not REAL_ARITHMETIC */ | |
290 | ||
291 | /* emulator uses host format */ | |
a0353055 RK |
292 | #define GET_REAL(r,e) e53toe ((unsigned EMUSHORT *) (r), (e)) |
293 | #define PUT_REAL(e,r) etoe53 ((e), (unsigned EMUSHORT *) (r)) | |
985b6196 RS |
294 | |
295 | #endif /* not REAL_ARITHMETIC */ | |
842fbaaa | 296 | #endif /* not TFmode */ |
f5963e61 | 297 | #endif /* not XFmode */ |
985b6196 | 298 | |
842fbaaa JW |
299 | |
300 | /* Number of 16 bit words in internal format */ | |
301 | #define NI (NE+3) | |
302 | ||
303 | /* Array offset to exponent */ | |
304 | #define E 1 | |
305 | ||
306 | /* Array offset to high guard word */ | |
307 | #define M 2 | |
308 | ||
309 | /* Number of bits of precision */ | |
310 | #define NBITS ((NI-4)*16) | |
311 | ||
312 | /* Maximum number of decimal digits in ASCII conversion | |
313 | * = NBITS*log10(2) | |
314 | */ | |
315 | #define NDEC (NBITS*8/27) | |
316 | ||
317 | /* The exponent of 1.0 */ | |
318 | #define EXONE (0x3fff) | |
319 | ||
64685ffa | 320 | extern int extra_warnings; |
9d1bd99c MM |
321 | extern unsigned EMUSHORT ezero[], ehalf[], eone[], etwo[]; |
322 | extern unsigned EMUSHORT elog2[], esqrt2[]; | |
a0353055 RK |
323 | |
324 | static void endian PROTO((unsigned EMUSHORT *, long *, | |
325 | enum machine_mode)); | |
326 | static void eclear PROTO((unsigned EMUSHORT *)); | |
327 | static void emov PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
328 | static void eabs PROTO((unsigned EMUSHORT *)); | |
329 | static void eneg PROTO((unsigned EMUSHORT *)); | |
330 | static int eisneg PROTO((unsigned EMUSHORT *)); | |
331 | static int eisinf PROTO((unsigned EMUSHORT *)); | |
332 | static int eisnan PROTO((unsigned EMUSHORT *)); | |
333 | static void einfin PROTO((unsigned EMUSHORT *)); | |
334 | static void enan PROTO((unsigned EMUSHORT *, int)); | |
335 | static void emovi PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
336 | static void emovo PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
337 | static void ecleaz PROTO((unsigned EMUSHORT *)); | |
338 | static void ecleazs PROTO((unsigned EMUSHORT *)); | |
339 | static void emovz PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
340 | static void einan PROTO((unsigned EMUSHORT *)); | |
341 | static int eiisnan PROTO((unsigned EMUSHORT *)); | |
342 | static int eiisneg PROTO((unsigned EMUSHORT *)); | |
343 | static void eiinfin PROTO((unsigned EMUSHORT *)); | |
344 | static int eiisinf PROTO((unsigned EMUSHORT *)); | |
345 | static int ecmpm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
346 | static void eshdn1 PROTO((unsigned EMUSHORT *)); | |
347 | static void eshup1 PROTO((unsigned EMUSHORT *)); | |
348 | static void eshdn8 PROTO((unsigned EMUSHORT *)); | |
349 | static void eshup8 PROTO((unsigned EMUSHORT *)); | |
350 | static void eshup6 PROTO((unsigned EMUSHORT *)); | |
351 | static void eshdn6 PROTO((unsigned EMUSHORT *)); | |
352 | static void eaddm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));\f | |
353 | static void esubm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
c92d992a | 354 | static void m16m PROTO((unsigned int, unsigned short *, |
a0353055 RK |
355 | unsigned short *)); |
356 | static int edivm PROTO((unsigned short *, unsigned short *)); | |
357 | static int emulm PROTO((unsigned short *, unsigned short *)); | |
358 | static void emdnorm PROTO((unsigned EMUSHORT *, int, int, EMULONG, int)); | |
359 | static void esub PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
360 | unsigned EMUSHORT *)); | |
361 | static void eadd PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
362 | unsigned EMUSHORT *)); | |
363 | static void eadd1 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
364 | unsigned EMUSHORT *)); | |
365 | static void ediv PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
366 | unsigned EMUSHORT *)); | |
367 | static void emul PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
368 | unsigned EMUSHORT *)); | |
369 | static void e53toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
370 | static void e64toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
371 | static void e113toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
372 | static void e24toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
373 | static void etoe113 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
374 | static void toe113 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
375 | static void etoe64 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
376 | static void toe64 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
377 | static void etoe53 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
378 | static void toe53 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
379 | static void etoe24 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
380 | static void toe24 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
381 | static int ecmp PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
382 | static void eround PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
383 | static void ltoe PROTO((HOST_WIDE_INT *, unsigned EMUSHORT *)); | |
384 | static void ultoe PROTO((unsigned HOST_WIDE_INT *, unsigned EMUSHORT *)); | |
385 | static void eifrac PROTO((unsigned EMUSHORT *, HOST_WIDE_INT *, | |
386 | unsigned EMUSHORT *)); | |
387 | static void euifrac PROTO((unsigned EMUSHORT *, unsigned HOST_WIDE_INT *, | |
388 | unsigned EMUSHORT *)); | |
389 | static int eshift PROTO((unsigned EMUSHORT *, int)); | |
390 | static int enormlz PROTO((unsigned EMUSHORT *)); | |
391 | static void e24toasc PROTO((unsigned EMUSHORT *, char *, int)); | |
392 | static void e53toasc PROTO((unsigned EMUSHORT *, char *, int)); | |
393 | static void e64toasc PROTO((unsigned EMUSHORT *, char *, int)); | |
394 | static void e113toasc PROTO((unsigned EMUSHORT *, char *, int)); | |
395 | static void etoasc PROTO((unsigned EMUSHORT *, char *, int)); | |
396 | static void asctoe24 PROTO((char *, unsigned EMUSHORT *)); | |
397 | static void asctoe53 PROTO((char *, unsigned EMUSHORT *)); | |
398 | static void asctoe64 PROTO((char *, unsigned EMUSHORT *)); | |
399 | static void asctoe113 PROTO((char *, unsigned EMUSHORT *)); | |
400 | static void asctoe PROTO((char *, unsigned EMUSHORT *)); | |
401 | static void asctoeg PROTO((char *, unsigned EMUSHORT *, int)); | |
402 | static void efloor PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
8468c4a4 | 403 | #if 0 |
a0353055 RK |
404 | static void efrexp PROTO((unsigned EMUSHORT *, int *, |
405 | unsigned EMUSHORT *)); | |
8468c4a4 | 406 | #endif |
a0353055 | 407 | static void eldexp PROTO((unsigned EMUSHORT *, int, unsigned EMUSHORT *)); |
8468c4a4 | 408 | #if 0 |
a0353055 RK |
409 | static void eremain PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, |
410 | unsigned EMUSHORT *)); | |
8468c4a4 | 411 | #endif |
a0353055 RK |
412 | static void eiremain PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); |
413 | static void mtherr PROTO((char *, int)); | |
e9a25f70 | 414 | #ifdef DEC |
a0353055 RK |
415 | static void dectoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); |
416 | static void etodec PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
417 | static void todec PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
e9a25f70 JL |
418 | #endif |
419 | #ifdef IBM | |
a0353055 RK |
420 | static void ibmtoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, |
421 | enum machine_mode)); | |
422 | static void etoibm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
423 | enum machine_mode)); | |
424 | static void toibm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
425 | enum machine_mode)); | |
e9a25f70 | 426 | #endif |
f5963e61 JL |
427 | #ifdef C4X |
428 | static void c4xtoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
429 | enum machine_mode)); | |
430 | static void etoc4x PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
431 | enum machine_mode)); | |
432 | static void toc4x PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *, | |
433 | enum machine_mode)); | |
434 | #endif | |
a0353055 | 435 | static void make_nan PROTO((unsigned EMUSHORT *, int, enum machine_mode)); |
8468c4a4 | 436 | #if 0 |
a0353055 RK |
437 | static void uditoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); |
438 | static void ditoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
439 | static void etoudi PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
440 | static void etodi PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
441 | static void esqrt PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *)); | |
8468c4a4 | 442 | #endif |
775ba35d | 443 | \f |
b51ab098 RK |
444 | /* Copy 32-bit numbers obtained from array containing 16-bit numbers, |
445 | swapping ends if required, into output array of longs. The | |
446 | result is normally passed to fprintf by the ASM_OUTPUT_ macros. */ | |
a0353055 RK |
447 | |
448 | static void | |
985b6196 RS |
449 | endian (e, x, mode) |
450 | unsigned EMUSHORT e[]; | |
451 | long x[]; | |
452 | enum machine_mode mode; | |
453 | { | |
454 | unsigned long th, t; | |
455 | ||
8c35bbc5 | 456 | if (REAL_WORDS_BIG_ENDIAN) |
985b6196 | 457 | { |
f76b9db2 ILT |
458 | switch (mode) |
459 | { | |
f76b9db2 | 460 | case TFmode: |
0f41302f | 461 | /* Swap halfwords in the fourth long. */ |
f76b9db2 ILT |
462 | th = (unsigned long) e[6] & 0xffff; |
463 | t = (unsigned long) e[7] & 0xffff; | |
464 | t |= th << 16; | |
465 | x[3] = (long) t; | |
466 | ||
467 | case XFmode: | |
0f41302f | 468 | /* Swap halfwords in the third long. */ |
f76b9db2 ILT |
469 | th = (unsigned long) e[4] & 0xffff; |
470 | t = (unsigned long) e[5] & 0xffff; | |
471 | t |= th << 16; | |
472 | x[2] = (long) t; | |
473 | /* fall into the double case */ | |
474 | ||
475 | case DFmode: | |
f5963e61 | 476 | /* Swap halfwords in the second word. */ |
f76b9db2 ILT |
477 | th = (unsigned long) e[2] & 0xffff; |
478 | t = (unsigned long) e[3] & 0xffff; | |
479 | t |= th << 16; | |
480 | x[1] = (long) t; | |
481 | /* fall into the float case */ | |
482 | ||
f76b9db2 | 483 | case SFmode: |
f5963e61 JL |
484 | case HFmode: |
485 | /* Swap halfwords in the first word. */ | |
f76b9db2 ILT |
486 | th = (unsigned long) e[0] & 0xffff; |
487 | t = (unsigned long) e[1] & 0xffff; | |
488 | t |= th << 16; | |
f250a0bc | 489 | x[0] = (long) t; |
f76b9db2 | 490 | break; |
985b6196 | 491 | |
f76b9db2 ILT |
492 | default: |
493 | abort (); | |
494 | } | |
985b6196 | 495 | } |
f76b9db2 | 496 | else |
985b6196 | 497 | { |
0f41302f | 498 | /* Pack the output array without swapping. */ |
985b6196 | 499 | |
f76b9db2 ILT |
500 | switch (mode) |
501 | { | |
f76b9db2 | 502 | case TFmode: |
0f41302f | 503 | /* Pack the fourth long. */ |
f76b9db2 ILT |
504 | th = (unsigned long) e[7] & 0xffff; |
505 | t = (unsigned long) e[6] & 0xffff; | |
506 | t |= th << 16; | |
507 | x[3] = (long) t; | |
508 | ||
509 | case XFmode: | |
f76b9db2 ILT |
510 | /* Pack the third long. |
511 | Each element of the input REAL_VALUE_TYPE array has 16 useful bits | |
512 | in it. */ | |
513 | th = (unsigned long) e[5] & 0xffff; | |
514 | t = (unsigned long) e[4] & 0xffff; | |
515 | t |= th << 16; | |
516 | x[2] = (long) t; | |
517 | /* fall into the double case */ | |
518 | ||
519 | case DFmode: | |
f5963e61 | 520 | /* Pack the second long */ |
f76b9db2 ILT |
521 | th = (unsigned long) e[3] & 0xffff; |
522 | t = (unsigned long) e[2] & 0xffff; | |
523 | t |= th << 16; | |
524 | x[1] = (long) t; | |
525 | /* fall into the float case */ | |
526 | ||
f76b9db2 | 527 | case SFmode: |
f5963e61 JL |
528 | case HFmode: |
529 | /* Pack the first long */ | |
f76b9db2 ILT |
530 | th = (unsigned long) e[1] & 0xffff; |
531 | t = (unsigned long) e[0] & 0xffff; | |
532 | t |= th << 16; | |
f250a0bc | 533 | x[0] = (long) t; |
f76b9db2 | 534 | break; |
985b6196 | 535 | |
f76b9db2 ILT |
536 | default: |
537 | abort (); | |
538 | } | |
985b6196 | 539 | } |
985b6196 RS |
540 | } |
541 | ||
542 | ||
defb5dab | 543 | /* This is the implementation of the REAL_ARITHMETIC macro. */ |
a0353055 | 544 | |
985b6196 RS |
545 | void |
546 | earith (value, icode, r1, r2) | |
547 | REAL_VALUE_TYPE *value; | |
548 | int icode; | |
549 | REAL_VALUE_TYPE *r1; | |
550 | REAL_VALUE_TYPE *r2; | |
551 | { | |
552 | unsigned EMUSHORT d1[NE], d2[NE], v[NE]; | |
553 | enum tree_code code; | |
554 | ||
555 | GET_REAL (r1, d1); | |
556 | GET_REAL (r2, d2); | |
66b6d60b | 557 | #ifdef NANS |
0f41302f | 558 | /* Return NaN input back to the caller. */ |
66b6d60b RS |
559 | if (eisnan (d1)) |
560 | { | |
561 | PUT_REAL (d1, value); | |
562 | return; | |
563 | } | |
564 | if (eisnan (d2)) | |
565 | { | |
566 | PUT_REAL (d2, value); | |
567 | return; | |
568 | } | |
569 | #endif | |
985b6196 RS |
570 | code = (enum tree_code) icode; |
571 | switch (code) | |
572 | { | |
573 | case PLUS_EXPR: | |
574 | eadd (d2, d1, v); | |
575 | break; | |
576 | ||
577 | case MINUS_EXPR: | |
578 | esub (d2, d1, v); /* d1 - d2 */ | |
579 | break; | |
580 | ||
581 | case MULT_EXPR: | |
582 | emul (d2, d1, v); | |
583 | break; | |
584 | ||
585 | case RDIV_EXPR: | |
586 | #ifndef REAL_INFINITY | |
587 | if (ecmp (d2, ezero) == 0) | |
66b6d60b RS |
588 | { |
589 | #ifdef NANS | |
29e11dab | 590 | enan (v, eisneg (d1) ^ eisneg (d2)); |
66b6d60b RS |
591 | break; |
592 | #else | |
985b6196 | 593 | abort (); |
66b6d60b RS |
594 | #endif |
595 | } | |
985b6196 RS |
596 | #endif |
597 | ediv (d2, d1, v); /* d1/d2 */ | |
598 | break; | |
599 | ||
600 | case MIN_EXPR: /* min (d1,d2) */ | |
601 | if (ecmp (d1, d2) < 0) | |
602 | emov (d1, v); | |
603 | else | |
604 | emov (d2, v); | |
605 | break; | |
606 | ||
607 | case MAX_EXPR: /* max (d1,d2) */ | |
608 | if (ecmp (d1, d2) > 0) | |
609 | emov (d1, v); | |
610 | else | |
611 | emov (d2, v); | |
612 | break; | |
613 | default: | |
614 | emov (ezero, v); | |
615 | break; | |
616 | } | |
617 | PUT_REAL (v, value); | |
618 | } | |
619 | ||
620 | ||
defb5dab RK |
621 | /* Truncate REAL_VALUE_TYPE toward zero to signed HOST_WIDE_INT. |
622 | implements REAL_VALUE_RNDZINT (x) (etrunci (x)). */ | |
623 | ||
985b6196 RS |
624 | REAL_VALUE_TYPE |
625 | etrunci (x) | |
626 | REAL_VALUE_TYPE x; | |
627 | { | |
628 | unsigned EMUSHORT f[NE], g[NE]; | |
629 | REAL_VALUE_TYPE r; | |
b51ab098 | 630 | HOST_WIDE_INT l; |
985b6196 RS |
631 | |
632 | GET_REAL (&x, g); | |
66b6d60b RS |
633 | #ifdef NANS |
634 | if (eisnan (g)) | |
635 | return (x); | |
636 | #endif | |
985b6196 RS |
637 | eifrac (g, &l, f); |
638 | ltoe (&l, g); | |
639 | PUT_REAL (g, &r); | |
640 | return (r); | |
641 | } | |
642 | ||
643 | ||
defb5dab RK |
644 | /* Truncate REAL_VALUE_TYPE toward zero to unsigned HOST_WIDE_INT; |
645 | implements REAL_VALUE_UNSIGNED_RNDZINT (x) (etruncui (x)). */ | |
646 | ||
985b6196 RS |
647 | REAL_VALUE_TYPE |
648 | etruncui (x) | |
649 | REAL_VALUE_TYPE x; | |
650 | { | |
651 | unsigned EMUSHORT f[NE], g[NE]; | |
652 | REAL_VALUE_TYPE r; | |
b51ab098 | 653 | unsigned HOST_WIDE_INT l; |
985b6196 RS |
654 | |
655 | GET_REAL (&x, g); | |
66b6d60b RS |
656 | #ifdef NANS |
657 | if (eisnan (g)) | |
658 | return (x); | |
659 | #endif | |
985b6196 RS |
660 | euifrac (g, &l, f); |
661 | ultoe (&l, g); | |
662 | PUT_REAL (g, &r); | |
663 | return (r); | |
664 | } | |
665 | ||
666 | ||
defb5dab RK |
667 | /* This is the REAL_VALUE_ATOF function. It converts a decimal string to |
668 | binary, rounding off as indicated by the machine_mode argument. Then it | |
669 | promotes the rounded value to REAL_VALUE_TYPE. */ | |
670 | ||
985b6196 RS |
671 | REAL_VALUE_TYPE |
672 | ereal_atof (s, t) | |
673 | char *s; | |
674 | enum machine_mode t; | |
675 | { | |
676 | unsigned EMUSHORT tem[NE], e[NE]; | |
677 | REAL_VALUE_TYPE r; | |
678 | ||
679 | switch (t) | |
680 | { | |
bfbc6416 | 681 | case HFmode: |
985b6196 RS |
682 | case SFmode: |
683 | asctoe24 (s, tem); | |
684 | e24toe (tem, e); | |
685 | break; | |
f5963e61 | 686 | |
985b6196 RS |
687 | case DFmode: |
688 | asctoe53 (s, tem); | |
689 | e53toe (tem, e); | |
690 | break; | |
f5963e61 | 691 | |
985b6196 RS |
692 | case XFmode: |
693 | asctoe64 (s, tem); | |
694 | e64toe (tem, e); | |
695 | break; | |
f5963e61 | 696 | |
842fbaaa JW |
697 | case TFmode: |
698 | asctoe113 (s, tem); | |
699 | e113toe (tem, e); | |
700 | break; | |
f5963e61 | 701 | |
985b6196 RS |
702 | default: |
703 | asctoe (s, e); | |
704 | } | |
705 | PUT_REAL (e, &r); | |
706 | return (r); | |
707 | } | |
708 | ||
709 | ||
defb5dab RK |
710 | /* Expansion of REAL_NEGATE. */ |
711 | ||
985b6196 RS |
712 | REAL_VALUE_TYPE |
713 | ereal_negate (x) | |
714 | REAL_VALUE_TYPE x; | |
715 | { | |
716 | unsigned EMUSHORT e[NE]; | |
717 | REAL_VALUE_TYPE r; | |
718 | ||
719 | GET_REAL (&x, e); | |
720 | eneg (e); | |
721 | PUT_REAL (e, &r); | |
722 | return (r); | |
723 | } | |
724 | ||
725 | ||
defb5dab RK |
726 | /* Round real toward zero to HOST_WIDE_INT; |
727 | implements REAL_VALUE_FIX (x). */ | |
728 | ||
b51ab098 | 729 | HOST_WIDE_INT |
842fbaaa | 730 | efixi (x) |
985b6196 RS |
731 | REAL_VALUE_TYPE x; |
732 | { | |
733 | unsigned EMUSHORT f[NE], g[NE]; | |
b51ab098 | 734 | HOST_WIDE_INT l; |
985b6196 RS |
735 | |
736 | GET_REAL (&x, f); | |
66b6d60b RS |
737 | #ifdef NANS |
738 | if (eisnan (f)) | |
739 | { | |
740 | warning ("conversion from NaN to int"); | |
741 | return (-1); | |
742 | } | |
743 | #endif | |
842fbaaa JW |
744 | eifrac (f, &l, g); |
745 | return l; | |
985b6196 RS |
746 | } |
747 | ||
842fbaaa | 748 | /* Round real toward zero to unsigned HOST_WIDE_INT |
defb5dab RK |
749 | implements REAL_VALUE_UNSIGNED_FIX (x). |
750 | Negative input returns zero. */ | |
751 | ||
b51ab098 | 752 | unsigned HOST_WIDE_INT |
842fbaaa | 753 | efixui (x) |
985b6196 RS |
754 | REAL_VALUE_TYPE x; |
755 | { | |
756 | unsigned EMUSHORT f[NE], g[NE]; | |
b51ab098 | 757 | unsigned HOST_WIDE_INT l; |
985b6196 RS |
758 | |
759 | GET_REAL (&x, f); | |
66b6d60b RS |
760 | #ifdef NANS |
761 | if (eisnan (f)) | |
762 | { | |
763 | warning ("conversion from NaN to unsigned int"); | |
764 | return (-1); | |
765 | } | |
766 | #endif | |
842fbaaa JW |
767 | euifrac (f, &l, g); |
768 | return l; | |
985b6196 RS |
769 | } |
770 | ||
771 | ||
defb5dab RK |
772 | /* REAL_VALUE_FROM_INT macro. */ |
773 | ||
985b6196 | 774 | void |
48e73d63 | 775 | ereal_from_int (d, i, j, mode) |
985b6196 | 776 | REAL_VALUE_TYPE *d; |
b51ab098 | 777 | HOST_WIDE_INT i, j; |
48e73d63 | 778 | enum machine_mode mode; |
985b6196 RS |
779 | { |
780 | unsigned EMUSHORT df[NE], dg[NE]; | |
b51ab098 | 781 | HOST_WIDE_INT low, high; |
985b6196 RS |
782 | int sign; |
783 | ||
48e73d63 RK |
784 | if (GET_MODE_CLASS (mode) != MODE_FLOAT) |
785 | abort (); | |
985b6196 RS |
786 | sign = 0; |
787 | low = i; | |
788 | if ((high = j) < 0) | |
789 | { | |
790 | sign = 1; | |
791 | /* complement and add 1 */ | |
792 | high = ~high; | |
793 | if (low) | |
794 | low = -low; | |
795 | else | |
796 | high += 1; | |
797 | } | |
b51ab098 | 798 | eldexp (eone, HOST_BITS_PER_WIDE_INT, df); |
60e61165 | 799 | ultoe ((unsigned HOST_WIDE_INT *) &high, dg); |
985b6196 | 800 | emul (dg, df, dg); |
60e61165 | 801 | ultoe ((unsigned HOST_WIDE_INT *) &low, df); |
985b6196 RS |
802 | eadd (df, dg, dg); |
803 | if (sign) | |
804 | eneg (dg); | |
48e73d63 RK |
805 | |
806 | /* A REAL_VALUE_TYPE may not be wide enough to hold the two HOST_WIDE_INTS. | |
807 | Avoid double-rounding errors later by rounding off now from the | |
808 | extra-wide internal format to the requested precision. */ | |
809 | switch (GET_MODE_BITSIZE (mode)) | |
810 | { | |
811 | case 32: | |
812 | etoe24 (dg, df); | |
813 | e24toe (df, dg); | |
814 | break; | |
815 | ||
816 | case 64: | |
817 | etoe53 (dg, df); | |
818 | e53toe (df, dg); | |
819 | break; | |
820 | ||
821 | case 96: | |
822 | etoe64 (dg, df); | |
823 | e64toe (df, dg); | |
824 | break; | |
825 | ||
826 | case 128: | |
827 | etoe113 (dg, df); | |
828 | e113toe (df, dg); | |
829 | break; | |
830 | ||
831 | default: | |
832 | abort (); | |
833 | } | |
834 | ||
985b6196 RS |
835 | PUT_REAL (dg, d); |
836 | } | |
837 | ||
838 | ||
defb5dab | 839 | /* REAL_VALUE_FROM_UNSIGNED_INT macro. */ |
a0353055 | 840 | |
985b6196 | 841 | void |
48e73d63 | 842 | ereal_from_uint (d, i, j, mode) |
985b6196 | 843 | REAL_VALUE_TYPE *d; |
b51ab098 | 844 | unsigned HOST_WIDE_INT i, j; |
48e73d63 | 845 | enum machine_mode mode; |
985b6196 RS |
846 | { |
847 | unsigned EMUSHORT df[NE], dg[NE]; | |
b51ab098 | 848 | unsigned HOST_WIDE_INT low, high; |
985b6196 | 849 | |
48e73d63 RK |
850 | if (GET_MODE_CLASS (mode) != MODE_FLOAT) |
851 | abort (); | |
985b6196 RS |
852 | low = i; |
853 | high = j; | |
b51ab098 | 854 | eldexp (eone, HOST_BITS_PER_WIDE_INT, df); |
985b6196 RS |
855 | ultoe (&high, dg); |
856 | emul (dg, df, dg); | |
857 | ultoe (&low, df); | |
858 | eadd (df, dg, dg); | |
48e73d63 RK |
859 | |
860 | /* A REAL_VALUE_TYPE may not be wide enough to hold the two HOST_WIDE_INTS. | |
861 | Avoid double-rounding errors later by rounding off now from the | |
862 | extra-wide internal format to the requested precision. */ | |
863 | switch (GET_MODE_BITSIZE (mode)) | |
864 | { | |
865 | case 32: | |
866 | etoe24 (dg, df); | |
867 | e24toe (df, dg); | |
868 | break; | |
869 | ||
870 | case 64: | |
871 | etoe53 (dg, df); | |
872 | e53toe (df, dg); | |
873 | break; | |
874 | ||
875 | case 96: | |
876 | etoe64 (dg, df); | |
877 | e64toe (df, dg); | |
878 | break; | |
879 | ||
880 | case 128: | |
881 | etoe113 (dg, df); | |
882 | e113toe (df, dg); | |
883 | break; | |
884 | ||
885 | default: | |
886 | abort (); | |
887 | } | |
888 | ||
985b6196 RS |
889 | PUT_REAL (dg, d); |
890 | } | |
891 | ||
892 | ||
defb5dab RK |
893 | /* REAL_VALUE_TO_INT macro. */ |
894 | ||
985b6196 RS |
895 | void |
896 | ereal_to_int (low, high, rr) | |
b51ab098 | 897 | HOST_WIDE_INT *low, *high; |
985b6196 RS |
898 | REAL_VALUE_TYPE rr; |
899 | { | |
900 | unsigned EMUSHORT d[NE], df[NE], dg[NE], dh[NE]; | |
901 | int s; | |
902 | ||
903 | GET_REAL (&rr, d); | |
66b6d60b | 904 | #ifdef NANS |
970491df | 905 | if (eisnan (d)) |
66b6d60b RS |
906 | { |
907 | warning ("conversion from NaN to int"); | |
908 | *low = -1; | |
909 | *high = -1; | |
910 | return; | |
911 | } | |
912 | #endif | |
985b6196 RS |
913 | /* convert positive value */ |
914 | s = 0; | |
915 | if (eisneg (d)) | |
916 | { | |
917 | eneg (d); | |
918 | s = 1; | |
919 | } | |
b51ab098 | 920 | eldexp (eone, HOST_BITS_PER_WIDE_INT, df); |
985b6196 | 921 | ediv (df, d, dg); /* dg = d / 2^32 is the high word */ |
60e61165 | 922 | euifrac (dg, (unsigned HOST_WIDE_INT *) high, dh); |
985b6196 | 923 | emul (df, dh, dg); /* fractional part is the low word */ |
60e61165 | 924 | euifrac (dg, (unsigned HOST_WIDE_INT *)low, dh); |
985b6196 RS |
925 | if (s) |
926 | { | |
927 | /* complement and add 1 */ | |
928 | *high = ~(*high); | |
929 | if (*low) | |
930 | *low = -(*low); | |
931 | else | |
932 | *high += 1; | |
933 | } | |
934 | } | |
935 | ||
936 | ||
defb5dab RK |
937 | /* REAL_VALUE_LDEXP macro. */ |
938 | ||
985b6196 RS |
939 | REAL_VALUE_TYPE |
940 | ereal_ldexp (x, n) | |
941 | REAL_VALUE_TYPE x; | |
942 | int n; | |
943 | { | |
944 | unsigned EMUSHORT e[NE], y[NE]; | |
945 | REAL_VALUE_TYPE r; | |
946 | ||
947 | GET_REAL (&x, e); | |
66b6d60b RS |
948 | #ifdef NANS |
949 | if (eisnan (e)) | |
950 | return (x); | |
951 | #endif | |
985b6196 RS |
952 | eldexp (e, n, y); |
953 | PUT_REAL (y, &r); | |
954 | return (r); | |
955 | } | |
956 | ||
957 | /* These routines are conditionally compiled because functions | |
defb5dab RK |
958 | of the same names may be defined in fold-const.c. */ |
959 | ||
985b6196 RS |
960 | #ifdef REAL_ARITHMETIC |
961 | ||
0f41302f | 962 | /* Check for infinity in a REAL_VALUE_TYPE. */ |
defb5dab | 963 | |
985b6196 RS |
964 | int |
965 | target_isinf (x) | |
966 | REAL_VALUE_TYPE x; | |
967 | { | |
968 | unsigned EMUSHORT e[NE]; | |
969 | ||
970 | #ifdef INFINITY | |
971 | GET_REAL (&x, e); | |
972 | return (eisinf (e)); | |
973 | #else | |
974 | return 0; | |
975 | #endif | |
976 | } | |
977 | ||
0f41302f | 978 | /* Check whether a REAL_VALUE_TYPE item is a NaN. */ |
985b6196 RS |
979 | |
980 | int | |
981 | target_isnan (x) | |
982 | REAL_VALUE_TYPE x; | |
983 | { | |
9d72da33 RS |
984 | unsigned EMUSHORT e[NE]; |
985 | ||
66b6d60b | 986 | #ifdef NANS |
9d72da33 RS |
987 | GET_REAL (&x, e); |
988 | return (eisnan (e)); | |
66b6d60b | 989 | #else |
985b6196 | 990 | return (0); |
66b6d60b | 991 | #endif |
985b6196 RS |
992 | } |
993 | ||
994 | ||
66b6d60b | 995 | /* Check for a negative REAL_VALUE_TYPE number. |
0f41302f | 996 | This just checks the sign bit, so that -0 counts as negative. */ |
985b6196 RS |
997 | |
998 | int | |
999 | target_negative (x) | |
1000 | REAL_VALUE_TYPE x; | |
1001 | { | |
281bb5e4 | 1002 | return ereal_isneg (x); |
985b6196 RS |
1003 | } |
1004 | ||
1005 | /* Expansion of REAL_VALUE_TRUNCATE. | |
defb5dab RK |
1006 | The result is in floating point, rounded to nearest or even. */ |
1007 | ||
985b6196 RS |
1008 | REAL_VALUE_TYPE |
1009 | real_value_truncate (mode, arg) | |
1010 | enum machine_mode mode; | |
1011 | REAL_VALUE_TYPE arg; | |
1012 | { | |
1013 | unsigned EMUSHORT e[NE], t[NE]; | |
1014 | REAL_VALUE_TYPE r; | |
1015 | ||
1016 | GET_REAL (&arg, e); | |
66b6d60b RS |
1017 | #ifdef NANS |
1018 | if (eisnan (e)) | |
1019 | return (arg); | |
1020 | #endif | |
985b6196 RS |
1021 | eclear (t); |
1022 | switch (mode) | |
1023 | { | |
842fbaaa JW |
1024 | case TFmode: |
1025 | etoe113 (e, t); | |
1026 | e113toe (t, t); | |
1027 | break; | |
1028 | ||
985b6196 RS |
1029 | case XFmode: |
1030 | etoe64 (e, t); | |
1031 | e64toe (t, t); | |
1032 | break; | |
1033 | ||
1034 | case DFmode: | |
1035 | etoe53 (e, t); | |
1036 | e53toe (t, t); | |
1037 | break; | |
1038 | ||
1039 | case SFmode: | |
f5963e61 | 1040 | case HFmode: |
985b6196 RS |
1041 | etoe24 (e, t); |
1042 | e24toe (t, t); | |
1043 | break; | |
1044 | ||
1045 | case SImode: | |
f8ece317 | 1046 | r = etrunci (arg); |
985b6196 RS |
1047 | return (r); |
1048 | ||
0de689b7 RK |
1049 | /* If an unsupported type was requested, presume that |
1050 | the machine files know something useful to do with | |
1051 | the unmodified value. */ | |
defb5dab | 1052 | |
985b6196 | 1053 | default: |
0de689b7 | 1054 | return (arg); |
985b6196 RS |
1055 | } |
1056 | PUT_REAL (t, &r); | |
1057 | return (r); | |
1058 | } | |
1059 | ||
cccc8091 RK |
1060 | /* Try to change R into its exact multiplicative inverse in machine mode |
1061 | MODE. Return nonzero function value if successful. */ | |
1062 | ||
1063 | int | |
1064 | exact_real_inverse (mode, r) | |
1065 | enum machine_mode mode; | |
1066 | REAL_VALUE_TYPE *r; | |
1067 | { | |
1068 | unsigned EMUSHORT e[NE], einv[NE]; | |
1069 | REAL_VALUE_TYPE rinv; | |
1070 | int i; | |
1071 | ||
1072 | GET_REAL (r, e); | |
1073 | ||
1074 | /* Test for input in range. Don't transform IEEE special values. */ | |
1075 | if (eisinf (e) || eisnan (e) || (ecmp (e, ezero) == 0)) | |
1076 | return 0; | |
1077 | ||
1078 | /* Test for a power of 2: all significand bits zero except the MSB. | |
1079 | We are assuming the target has binary (or hex) arithmetic. */ | |
1080 | if (e[NE - 2] != 0x8000) | |
1081 | return 0; | |
1082 | ||
1083 | for (i = 0; i < NE - 2; i++) | |
1084 | { | |
1085 | if (e[i] != 0) | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | /* Compute the inverse and truncate it to the required mode. */ | |
1090 | ediv (e, eone, einv); | |
1091 | PUT_REAL (einv, &rinv); | |
1092 | rinv = real_value_truncate (mode, rinv); | |
1093 | ||
1094 | #ifdef CHECK_FLOAT_VALUE | |
1095 | /* This check is not redundant. It may, for example, flush | |
1096 | a supposedly IEEE denormal value to zero. */ | |
1097 | i = 0; | |
1098 | if (CHECK_FLOAT_VALUE (mode, rinv, i)) | |
1099 | return 0; | |
1100 | #endif | |
1101 | GET_REAL (&rinv, einv); | |
1102 | ||
1103 | /* Check the bits again, because the truncation might have | |
1104 | generated an arbitrary saturation value on overflow. */ | |
1105 | if (einv[NE - 2] != 0x8000) | |
1106 | return 0; | |
1107 | ||
1108 | for (i = 0; i < NE - 2; i++) | |
1109 | { | |
1110 | if (einv[i] != 0) | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | /* Fail if the computed inverse is out of range. */ | |
1115 | if (eisinf (einv) || eisnan (einv) || (ecmp (einv, ezero) == 0)) | |
1116 | return 0; | |
1117 | ||
1118 | /* Output the reciprocal and return success flag. */ | |
1119 | PUT_REAL (einv, r); | |
1120 | return 1; | |
1121 | } | |
985b6196 RS |
1122 | #endif /* REAL_ARITHMETIC defined */ |
1123 | ||
775ba35d RS |
1124 | /* Used for debugging--print the value of R in human-readable format |
1125 | on stderr. */ | |
1126 | ||
1127 | void | |
1128 | debug_real (r) | |
1129 | REAL_VALUE_TYPE r; | |
1130 | { | |
1131 | char dstr[30]; | |
1132 | ||
1133 | REAL_VALUE_TO_DECIMAL (r, "%.20g", dstr); | |
1134 | fprintf (stderr, "%s", dstr); | |
1135 | } | |
1136 | ||
1137 | \f | |
8c35bbc5 RK |
1138 | /* The following routines convert REAL_VALUE_TYPE to the various floating |
1139 | point formats that are meaningful to supported computers. | |
1140 | ||
1141 | The results are returned in 32-bit pieces, each piece stored in a `long'. | |
1142 | This is so they can be printed by statements like | |
1143 | ||
1144 | fprintf (file, "%lx, %lx", L[0], L[1]); | |
1145 | ||
1146 | that will work on both narrow- and wide-word host computers. */ | |
842fbaaa | 1147 | |
8c35bbc5 RK |
1148 | /* Convert R to a 128-bit long double precision value. The output array L |
1149 | contains four 32-bit pieces of the result, in the order they would appear | |
1150 | in memory. */ | |
defb5dab | 1151 | |
842fbaaa JW |
1152 | void |
1153 | etartdouble (r, l) | |
1154 | REAL_VALUE_TYPE r; | |
1155 | long l[]; | |
1156 | { | |
1157 | unsigned EMUSHORT e[NE]; | |
1158 | ||
1159 | GET_REAL (&r, e); | |
1160 | etoe113 (e, e); | |
1161 | endian (e, l, TFmode); | |
1162 | } | |
1163 | ||
8c35bbc5 RK |
1164 | /* Convert R to a double extended precision value. The output array L |
1165 | contains three 32-bit pieces of the result, in the order they would | |
1166 | appear in memory. */ | |
defb5dab | 1167 | |
985b6196 RS |
1168 | void |
1169 | etarldouble (r, l) | |
1170 | REAL_VALUE_TYPE r; | |
1171 | long l[]; | |
1172 | { | |
1173 | unsigned EMUSHORT e[NE]; | |
1174 | ||
1175 | GET_REAL (&r, e); | |
1176 | etoe64 (e, e); | |
1177 | endian (e, l, XFmode); | |
1178 | } | |
1179 | ||
8c35bbc5 RK |
1180 | /* Convert R to a double precision value. The output array L contains two |
1181 | 32-bit pieces of the result, in the order they would appear in memory. */ | |
1182 | ||
985b6196 RS |
1183 | void |
1184 | etardouble (r, l) | |
1185 | REAL_VALUE_TYPE r; | |
1186 | long l[]; | |
1187 | { | |
1188 | unsigned EMUSHORT e[NE]; | |
1189 | ||
1190 | GET_REAL (&r, e); | |
1191 | etoe53 (e, e); | |
1192 | endian (e, l, DFmode); | |
1193 | } | |
1194 | ||
8c35bbc5 RK |
1195 | /* Convert R to a single precision float value stored in the least-significant |
1196 | bits of a `long'. */ | |
1197 | ||
985b6196 RS |
1198 | long |
1199 | etarsingle (r) | |
1200 | REAL_VALUE_TYPE r; | |
1201 | { | |
1202 | unsigned EMUSHORT e[NE]; | |
60e61165 | 1203 | long l; |
985b6196 RS |
1204 | |
1205 | GET_REAL (&r, e); | |
1206 | etoe24 (e, e); | |
1207 | endian (e, &l, SFmode); | |
1208 | return ((long) l); | |
1209 | } | |
1210 | ||
8c35bbc5 RK |
1211 | /* Convert X to a decimal ASCII string S for output to an assembly |
1212 | language file. Note, there is no standard way to spell infinity or | |
1213 | a NaN, so these values may require special treatment in the tm.h | |
1214 | macros. */ | |
1215 | ||
985b6196 RS |
1216 | void |
1217 | ereal_to_decimal (x, s) | |
1218 | REAL_VALUE_TYPE x; | |
1219 | char *s; | |
1220 | { | |
1221 | unsigned EMUSHORT e[NE]; | |
1222 | ||
1223 | GET_REAL (&x, e); | |
1224 | etoasc (e, s, 20); | |
1225 | } | |
1226 | ||
8c35bbc5 RK |
1227 | /* Compare X and Y. Return 1 if X > Y, 0 if X == Y, -1 if X < Y, |
1228 | or -2 if either is a NaN. */ | |
1229 | ||
985b6196 RS |
1230 | int |
1231 | ereal_cmp (x, y) | |
1232 | REAL_VALUE_TYPE x, y; | |
1233 | { | |
1234 | unsigned EMUSHORT ex[NE], ey[NE]; | |
1235 | ||
1236 | GET_REAL (&x, ex); | |
1237 | GET_REAL (&y, ey); | |
1238 | return (ecmp (ex, ey)); | |
1239 | } | |
1240 | ||
8c35bbc5 RK |
1241 | /* Return 1 if the sign bit of X is set, else return 0. */ |
1242 | ||
985b6196 RS |
1243 | int |
1244 | ereal_isneg (x) | |
1245 | REAL_VALUE_TYPE x; | |
1246 | { | |
1247 | unsigned EMUSHORT ex[NE]; | |
1248 | ||
1249 | GET_REAL (&x, ex); | |
1250 | return (eisneg (ex)); | |
1251 | } | |
1252 | ||
1253 | /* End of REAL_ARITHMETIC interface */ | |
775ba35d | 1254 | \f |
defb5dab RK |
1255 | /* |
1256 | Extended precision IEEE binary floating point arithmetic routines | |
1257 | ||
1258 | Numbers are stored in C language as arrays of 16-bit unsigned | |
1259 | short integers. The arguments of the routines are pointers to | |
1260 | the arrays. | |
1261 | ||
8c35bbc5 | 1262 | External e type data structure, similar to Intel 8087 chip |
defb5dab RK |
1263 | temporary real format but possibly with a larger significand: |
1264 | ||
1265 | NE-1 significand words (least significant word first, | |
1266 | most significant bit is normally set) | |
1267 | exponent (value = EXONE for 1.0, | |
1268 | top bit is the sign) | |
1269 | ||
1270 | ||
8c35bbc5 | 1271 | Internal exploded e-type data structure of a number (a "word" is 16 bits): |
defb5dab RK |
1272 | |
1273 | ei[0] sign word (0 for positive, 0xffff for negative) | |
1274 | ei[1] biased exponent (value = EXONE for the number 1.0) | |
1275 | ei[2] high guard word (always zero after normalization) | |
1276 | ei[3] | |
1277 | to ei[NI-2] significand (NI-4 significand words, | |
1278 | most significant word first, | |
1279 | most significant bit is set) | |
1280 | ei[NI-1] low guard word (0x8000 bit is rounding place) | |
1281 | ||
1282 | ||
1283 | ||
8c35bbc5 | 1284 | Routines for external format e-type numbers |
defb5dab RK |
1285 | |
1286 | asctoe (string, e) ASCII string to extended double e type | |
1287 | asctoe64 (string, &d) ASCII string to long double | |
1288 | asctoe53 (string, &d) ASCII string to double | |
1289 | asctoe24 (string, &f) ASCII string to single | |
1290 | asctoeg (string, e, prec) ASCII string to specified precision | |
1291 | e24toe (&f, e) IEEE single precision to e type | |
1292 | e53toe (&d, e) IEEE double precision to e type | |
1293 | e64toe (&d, e) IEEE long double precision to e type | |
1294 | e113toe (&d, e) 128-bit long double precision to e type | |
1295 | eabs (e) absolute value | |
1296 | eadd (a, b, c) c = b + a | |
1297 | eclear (e) e = 0 | |
1298 | ecmp (a, b) Returns 1 if a > b, 0 if a == b, | |
1299 | -1 if a < b, -2 if either a or b is a NaN. | |
1300 | ediv (a, b, c) c = b / a | |
1301 | efloor (a, b) truncate to integer, toward -infinity | |
1302 | efrexp (a, exp, s) extract exponent and significand | |
1303 | eifrac (e, &l, frac) e to HOST_WIDE_INT and e type fraction | |
1304 | euifrac (e, &l, frac) e to unsigned HOST_WIDE_INT and e type fraction | |
1305 | einfin (e) set e to infinity, leaving its sign alone | |
1306 | eldexp (a, n, b) multiply by 2**n | |
1307 | emov (a, b) b = a | |
1308 | emul (a, b, c) c = b * a | |
1309 | eneg (e) e = -e | |
1310 | eround (a, b) b = nearest integer value to a | |
1311 | esub (a, b, c) c = b - a | |
1312 | e24toasc (&f, str, n) single to ASCII string, n digits after decimal | |
1313 | e53toasc (&d, str, n) double to ASCII string, n digits after decimal | |
1314 | e64toasc (&d, str, n) 80-bit long double to ASCII string | |
1315 | e113toasc (&d, str, n) 128-bit long double to ASCII string | |
1316 | etoasc (e, str, n) e to ASCII string, n digits after decimal | |
1317 | etoe24 (e, &f) convert e type to IEEE single precision | |
1318 | etoe53 (e, &d) convert e type to IEEE double precision | |
1319 | etoe64 (e, &d) convert e type to IEEE long double precision | |
1320 | ltoe (&l, e) HOST_WIDE_INT to e type | |
1321 | ultoe (&l, e) unsigned HOST_WIDE_INT to e type | |
1322 | eisneg (e) 1 if sign bit of e != 0, else 0 | |
1323 | eisinf (e) 1 if e has maximum exponent (non-IEEE) | |
1324 | or is infinite (IEEE) | |
1325 | eisnan (e) 1 if e is a NaN | |
1326 | ||
1327 | ||
8c35bbc5 | 1328 | Routines for internal format exploded e-type numbers |
defb5dab RK |
1329 | |
1330 | eaddm (ai, bi) add significands, bi = bi + ai | |
1331 | ecleaz (ei) ei = 0 | |
1332 | ecleazs (ei) set ei = 0 but leave its sign alone | |
1333 | ecmpm (ai, bi) compare significands, return 1, 0, or -1 | |
1334 | edivm (ai, bi) divide significands, bi = bi / ai | |
1335 | emdnorm (ai,l,s,exp) normalize and round off | |
1336 | emovi (a, ai) convert external a to internal ai | |
1337 | emovo (ai, a) convert internal ai to external a | |
1338 | emovz (ai, bi) bi = ai, low guard word of bi = 0 | |
1339 | emulm (ai, bi) multiply significands, bi = bi * ai | |
1340 | enormlz (ei) left-justify the significand | |
1341 | eshdn1 (ai) shift significand and guards down 1 bit | |
1342 | eshdn8 (ai) shift down 8 bits | |
1343 | eshdn6 (ai) shift down 16 bits | |
1344 | eshift (ai, n) shift ai n bits up (or down if n < 0) | |
1345 | eshup1 (ai) shift significand and guards up 1 bit | |
1346 | eshup8 (ai) shift up 8 bits | |
1347 | eshup6 (ai) shift up 16 bits | |
1348 | esubm (ai, bi) subtract significands, bi = bi - ai | |
1349 | eiisinf (ai) 1 if infinite | |
1350 | eiisnan (ai) 1 if a NaN | |
1351 | eiisneg (ai) 1 if sign bit of ai != 0, else 0 | |
1352 | einan (ai) set ai = NaN | |
1353 | eiinfin (ai) set ai = infinity | |
1354 | ||
1355 | The result is always normalized and rounded to NI-4 word precision | |
1356 | after each arithmetic operation. | |
1357 | ||
1358 | Exception flags are NOT fully supported. | |
1359 | ||
1360 | Signaling NaN's are NOT supported; they are treated the same | |
1361 | as quiet NaN's. | |
1362 | ||
1363 | Define INFINITY for support of infinity; otherwise a | |
1364 | saturation arithmetic is implemented. | |
1365 | ||
1366 | Define NANS for support of Not-a-Number items; otherwise the | |
1367 | arithmetic will never produce a NaN output, and might be confused | |
1368 | by a NaN input. | |
1369 | If NaN's are supported, the output of `ecmp (a,b)' is -2 if | |
1370 | either a or b is a NaN. This means asking `if (ecmp (a,b) < 0)' | |
1371 | may not be legitimate. Use `if (ecmp (a,b) == -1)' for `less than' | |
1372 | if in doubt. | |
1373 | ||
1374 | Denormals are always supported here where appropriate (e.g., not | |
1375 | for conversion to DEC numbers). */ | |
1376 | ||
1377 | /* Definitions for error codes that are passed to the common error handling | |
1378 | routine mtherr. | |
1379 | ||
1380 | For Digital Equipment PDP-11 and VAX computers, certain | |
1381 | IBM systems, and others that use numbers with a 56-bit | |
1382 | significand, the symbol DEC should be defined. In this | |
1383 | mode, most floating point constants are given as arrays | |
1384 | of octal integers to eliminate decimal to binary conversion | |
1385 | errors that might be introduced by the compiler. | |
1386 | ||
1387 | For computers, such as IBM PC, that follow the IEEE | |
1388 | Standard for Binary Floating Point Arithmetic (ANSI/IEEE | |
8c35bbc5 | 1389 | Std 754-1985), the symbol IEEE should be defined. |
defb5dab RK |
1390 | These numbers have 53-bit significands. In this mode, constants |
1391 | are provided as arrays of hexadecimal 16 bit integers. | |
8c35bbc5 RK |
1392 | The endian-ness of generated values is controlled by |
1393 | REAL_WORDS_BIG_ENDIAN. | |
defb5dab RK |
1394 | |
1395 | To accommodate other types of computer arithmetic, all | |
1396 | constants are also provided in a normal decimal radix | |
1397 | which one can hope are correctly converted to a suitable | |
1398 | format by the available C language compiler. To invoke | |
1399 | this mode, the symbol UNK is defined. | |
1400 | ||
1401 | An important difference among these modes is a predefined | |
1402 | set of machine arithmetic constants for each. The numbers | |
1403 | MACHEP (the machine roundoff error), MAXNUM (largest number | |
1404 | represented), and several other parameters are preset by | |
1405 | the configuration symbol. Check the file const.c to | |
1406 | ensure that these values are correct for your computer. | |
1407 | ||
1408 | For ANSI C compatibility, define ANSIC equal to 1. Currently | |
0f41302f | 1409 | this affects only the atan2 function and others that use it. */ |
985b6196 | 1410 | |
e8650b8f | 1411 | /* Constant definitions for math error conditions. */ |
985b6196 RS |
1412 | |
1413 | #define DOMAIN 1 /* argument domain error */ | |
1414 | #define SING 2 /* argument singularity */ | |
1415 | #define OVERFLOW 3 /* overflow range error */ | |
1416 | #define UNDERFLOW 4 /* underflow range error */ | |
1417 | #define TLOSS 5 /* total loss of precision */ | |
1418 | #define PLOSS 6 /* partial loss of precision */ | |
66b6d60b | 1419 | #define INVALID 7 /* NaN-producing operation */ |
985b6196 | 1420 | |
985b6196 RS |
1421 | /* e type constants used by high precision check routines */ |
1422 | ||
842fbaaa | 1423 | #if LONG_DOUBLE_TYPE_SIZE == 128 |
985b6196 RS |
1424 | /* 0.0 */ |
1425 | unsigned EMUSHORT ezero[NE] = | |
842fbaaa JW |
1426 | {0x0000, 0x0000, 0x0000, 0x0000, |
1427 | 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,}; | |
985b6196 RS |
1428 | extern unsigned EMUSHORT ezero[]; |
1429 | ||
1430 | /* 5.0E-1 */ | |
1431 | unsigned EMUSHORT ehalf[NE] = | |
842fbaaa JW |
1432 | {0x0000, 0x0000, 0x0000, 0x0000, |
1433 | 0x0000, 0x0000, 0x0000, 0x0000, 0x8000, 0x3ffe,}; | |
985b6196 RS |
1434 | extern unsigned EMUSHORT ehalf[]; |
1435 | ||
1436 | /* 1.0E0 */ | |
1437 | unsigned EMUSHORT eone[NE] = | |
842fbaaa JW |
1438 | {0x0000, 0x0000, 0x0000, 0x0000, |
1439 | 0x0000, 0x0000, 0x0000, 0x0000, 0x8000, 0x3fff,}; | |
985b6196 RS |
1440 | extern unsigned EMUSHORT eone[]; |
1441 | ||
1442 | /* 2.0E0 */ | |
1443 | unsigned EMUSHORT etwo[NE] = | |
842fbaaa JW |
1444 | {0x0000, 0x0000, 0x0000, 0x0000, |
1445 | 0x0000, 0x0000, 0x0000, 0x0000, 0x8000, 0x4000,}; | |
985b6196 RS |
1446 | extern unsigned EMUSHORT etwo[]; |
1447 | ||
1448 | /* 3.2E1 */ | |
1449 | unsigned EMUSHORT e32[NE] = | |
842fbaaa JW |
1450 | {0x0000, 0x0000, 0x0000, 0x0000, |
1451 | 0x0000, 0x0000, 0x0000, 0x0000, 0x8000, 0x4004,}; | |
985b6196 RS |
1452 | extern unsigned EMUSHORT e32[]; |
1453 | ||
1454 | /* 6.93147180559945309417232121458176568075500134360255E-1 */ | |
1455 | unsigned EMUSHORT elog2[NE] = | |
842fbaaa JW |
1456 | {0x40f3, 0xf6af, 0x03f2, 0xb398, |
1457 | 0xc9e3, 0x79ab, 0150717, 0013767, 0130562, 0x3ffe,}; | |
985b6196 RS |
1458 | extern unsigned EMUSHORT elog2[]; |
1459 | ||
1460 | /* 1.41421356237309504880168872420969807856967187537695E0 */ | |
1461 | unsigned EMUSHORT esqrt2[NE] = | |
842fbaaa JW |
1462 | {0x1d6f, 0xbe9f, 0x754a, 0x89b3, |
1463 | 0x597d, 0x6484, 0174736, 0171463, 0132404, 0x3fff,}; | |
985b6196 RS |
1464 | extern unsigned EMUSHORT esqrt2[]; |
1465 | ||
985b6196 RS |
1466 | /* 3.14159265358979323846264338327950288419716939937511E0 */ |
1467 | unsigned EMUSHORT epi[NE] = | |
842fbaaa | 1468 | {0x2902, 0x1cd1, 0x80dc, 0x628b, |
985b6196 RS |
1469 | 0xc4c6, 0xc234, 0020550, 0155242, 0144417, 0040000,}; |
1470 | extern unsigned EMUSHORT epi[]; | |
1471 | ||
842fbaaa JW |
1472 | #else |
1473 | /* LONG_DOUBLE_TYPE_SIZE is other than 128 */ | |
1474 | unsigned EMUSHORT ezero[NE] = | |
1475 | {0, 0000000, 0000000, 0000000, 0000000, 0000000,}; | |
1476 | unsigned EMUSHORT ehalf[NE] = | |
1477 | {0, 0000000, 0000000, 0000000, 0100000, 0x3ffe,}; | |
1478 | unsigned EMUSHORT eone[NE] = | |
1479 | {0, 0000000, 0000000, 0000000, 0100000, 0x3fff,}; | |
1480 | unsigned EMUSHORT etwo[NE] = | |
1481 | {0, 0000000, 0000000, 0000000, 0100000, 0040000,}; | |
1482 | unsigned EMUSHORT e32[NE] = | |
1483 | {0, 0000000, 0000000, 0000000, 0100000, 0040004,}; | |
1484 | unsigned EMUSHORT elog2[NE] = | |
1485 | {0xc9e4, 0x79ab, 0150717, 0013767, 0130562, 0x3ffe,}; | |
1486 | unsigned EMUSHORT esqrt2[NE] = | |
1487 | {0x597e, 0x6484, 0174736, 0171463, 0132404, 0x3fff,}; | |
1488 | unsigned EMUSHORT epi[NE] = | |
1489 | {0xc4c6, 0xc234, 0020550, 0155242, 0144417, 0040000,}; | |
1490 | #endif | |
985b6196 | 1491 | |
985b6196 | 1492 | /* Control register for rounding precision. |
defb5dab RK |
1493 | This can be set to 113 (if NE=10), 80 (if NE=6), 64, 56, 53, or 24 bits. */ |
1494 | ||
985b6196 RS |
1495 | int rndprc = NBITS; |
1496 | extern int rndprc; | |
1497 | ||
8c35bbc5 | 1498 | /* Clear out entire e-type number X. */ |
985b6196 | 1499 | |
a0353055 | 1500 | static void |
985b6196 RS |
1501 | eclear (x) |
1502 | register unsigned EMUSHORT *x; | |
1503 | { | |
1504 | register int i; | |
1505 | ||
1506 | for (i = 0; i < NE; i++) | |
1507 | *x++ = 0; | |
1508 | } | |
1509 | ||
8c35bbc5 | 1510 | /* Move e-type number from A to B. */ |
985b6196 | 1511 | |
a0353055 | 1512 | static void |
985b6196 RS |
1513 | emov (a, b) |
1514 | register unsigned EMUSHORT *a, *b; | |
1515 | { | |
1516 | register int i; | |
1517 | ||
1518 | for (i = 0; i < NE; i++) | |
1519 | *b++ = *a++; | |
1520 | } | |
1521 | ||
1522 | ||
8c35bbc5 | 1523 | /* Absolute value of e-type X. */ |
985b6196 | 1524 | |
a0353055 | 1525 | static void |
985b6196 | 1526 | eabs (x) |
a0353055 | 1527 | unsigned EMUSHORT x[]; |
985b6196 | 1528 | { |
a0353055 RK |
1529 | /* sign is top bit of last word of external format */ |
1530 | x[NE - 1] &= 0x7fff; | |
985b6196 RS |
1531 | } |
1532 | ||
8c35bbc5 | 1533 | /* Negate the e-type number X. */ |
985b6196 | 1534 | |
a0353055 | 1535 | static void |
985b6196 RS |
1536 | eneg (x) |
1537 | unsigned EMUSHORT x[]; | |
1538 | { | |
1539 | ||
1540 | x[NE - 1] ^= 0x8000; /* Toggle the sign bit */ | |
1541 | } | |
1542 | ||
8c35bbc5 | 1543 | /* Return 1 if sign bit of e-type number X is nonzero, else zero. */ |
defb5dab | 1544 | |
a0353055 | 1545 | static int |
985b6196 RS |
1546 | eisneg (x) |
1547 | unsigned EMUSHORT x[]; | |
1548 | { | |
1549 | ||
1550 | if (x[NE - 1] & 0x8000) | |
1551 | return (1); | |
1552 | else | |
1553 | return (0); | |
1554 | } | |
1555 | ||
8c35bbc5 | 1556 | /* Return 1 if e-type number X is infinity, else return zero. */ |
a0353055 RK |
1557 | |
1558 | static int | |
985b6196 RS |
1559 | eisinf (x) |
1560 | unsigned EMUSHORT x[]; | |
1561 | { | |
1562 | ||
66b6d60b RS |
1563 | #ifdef NANS |
1564 | if (eisnan (x)) | |
1565 | return (0); | |
1566 | #endif | |
985b6196 RS |
1567 | if ((x[NE - 1] & 0x7fff) == 0x7fff) |
1568 | return (1); | |
1569 | else | |
1570 | return (0); | |
1571 | } | |
1572 | ||
defb5dab RK |
1573 | /* Check if e-type number is not a number. The bit pattern is one that we |
1574 | defined, so we know for sure how to detect it. */ | |
66b6d60b | 1575 | |
a0353055 | 1576 | static int |
66b6d60b RS |
1577 | eisnan (x) |
1578 | unsigned EMUSHORT x[]; | |
1579 | { | |
66b6d60b RS |
1580 | #ifdef NANS |
1581 | int i; | |
defb5dab RK |
1582 | |
1583 | /* NaN has maximum exponent */ | |
66b6d60b RS |
1584 | if ((x[NE - 1] & 0x7fff) != 0x7fff) |
1585 | return (0); | |
0f41302f | 1586 | /* ... and non-zero significand field. */ |
66b6d60b RS |
1587 | for (i = 0; i < NE - 1; i++) |
1588 | { | |
1589 | if (*x++ != 0) | |
1590 | return (1); | |
1591 | } | |
1592 | #endif | |
defb5dab | 1593 | |
66b6d60b RS |
1594 | return (0); |
1595 | } | |
1596 | ||
8c35bbc5 | 1597 | /* Fill e-type number X with infinity pattern (IEEE) |
0f41302f | 1598 | or largest possible number (non-IEEE). */ |
985b6196 | 1599 | |
a0353055 | 1600 | static void |
985b6196 RS |
1601 | einfin (x) |
1602 | register unsigned EMUSHORT *x; | |
1603 | { | |
1604 | register int i; | |
1605 | ||
1606 | #ifdef INFINITY | |
1607 | for (i = 0; i < NE - 1; i++) | |
1608 | *x++ = 0; | |
1609 | *x |= 32767; | |
1610 | #else | |
1611 | for (i = 0; i < NE - 1; i++) | |
1612 | *x++ = 0xffff; | |
1613 | *x |= 32766; | |
1614 | if (rndprc < NBITS) | |
1615 | { | |
842fbaaa JW |
1616 | if (rndprc == 113) |
1617 | { | |
1618 | *(x - 9) = 0; | |
1619 | *(x - 8) = 0; | |
1620 | } | |
985b6196 RS |
1621 | if (rndprc == 64) |
1622 | { | |
1623 | *(x - 5) = 0; | |
1624 | } | |
1625 | if (rndprc == 53) | |
1626 | { | |
1627 | *(x - 4) = 0xf800; | |
1628 | } | |
1629 | else | |
1630 | { | |
1631 | *(x - 4) = 0; | |
1632 | *(x - 3) = 0; | |
1633 | *(x - 2) = 0xff00; | |
1634 | } | |
1635 | } | |
1636 | #endif | |
1637 | } | |
1638 | ||
66b6d60b RS |
1639 | /* Output an e-type NaN. |
1640 | This generates Intel's quiet NaN pattern for extended real. | |
1641 | The exponent is 7fff, the leading mantissa word is c000. */ | |
1642 | ||
a0353055 | 1643 | static void |
29e11dab | 1644 | enan (x, sign) |
66b6d60b | 1645 | register unsigned EMUSHORT *x; |
29e11dab | 1646 | int sign; |
66b6d60b RS |
1647 | { |
1648 | register int i; | |
1649 | ||
1650 | for (i = 0; i < NE - 2; i++) | |
1651 | *x++ = 0; | |
1652 | *x++ = 0xc000; | |
29e11dab | 1653 | *x = (sign << 15) | 0x7fff; |
66b6d60b RS |
1654 | } |
1655 | ||
8c35bbc5 | 1656 | /* Move in an e-type number A, converting it to exploded e-type B. */ |
defb5dab | 1657 | |
a0353055 | 1658 | static void |
985b6196 RS |
1659 | emovi (a, b) |
1660 | unsigned EMUSHORT *a, *b; | |
1661 | { | |
1662 | register unsigned EMUSHORT *p, *q; | |
1663 | int i; | |
1664 | ||
1665 | q = b; | |
1666 | p = a + (NE - 1); /* point to last word of external number */ | |
1667 | /* get the sign bit */ | |
1668 | if (*p & 0x8000) | |
1669 | *q++ = 0xffff; | |
1670 | else | |
1671 | *q++ = 0; | |
1672 | /* get the exponent */ | |
1673 | *q = *p--; | |
1674 | *q++ &= 0x7fff; /* delete the sign bit */ | |
1675 | #ifdef INFINITY | |
1676 | if ((*(q - 1) & 0x7fff) == 0x7fff) | |
1677 | { | |
66b6d60b RS |
1678 | #ifdef NANS |
1679 | if (eisnan (a)) | |
1680 | { | |
1681 | *q++ = 0; | |
1682 | for (i = 3; i < NI; i++) | |
1683 | *q++ = *p--; | |
1684 | return; | |
1685 | } | |
1686 | #endif | |
defb5dab | 1687 | |
985b6196 RS |
1688 | for (i = 2; i < NI; i++) |
1689 | *q++ = 0; | |
1690 | return; | |
1691 | } | |
1692 | #endif | |
defb5dab | 1693 | |
985b6196 RS |
1694 | /* clear high guard word */ |
1695 | *q++ = 0; | |
1696 | /* move in the significand */ | |
1697 | for (i = 0; i < NE - 1; i++) | |
1698 | *q++ = *p--; | |
1699 | /* clear low guard word */ | |
1700 | *q = 0; | |
1701 | } | |
1702 | ||
8c35bbc5 | 1703 | /* Move out exploded e-type number A, converting it to e type B. */ |
defb5dab | 1704 | |
a0353055 | 1705 | static void |
985b6196 RS |
1706 | emovo (a, b) |
1707 | unsigned EMUSHORT *a, *b; | |
1708 | { | |
1709 | register unsigned EMUSHORT *p, *q; | |
1710 | unsigned EMUSHORT i; | |
239b043b | 1711 | int j; |
985b6196 RS |
1712 | |
1713 | p = a; | |
1714 | q = b + (NE - 1); /* point to output exponent */ | |
1715 | /* combine sign and exponent */ | |
1716 | i = *p++; | |
1717 | if (i) | |
1718 | *q-- = *p++ | 0x8000; | |
1719 | else | |
1720 | *q-- = *p++; | |
1721 | #ifdef INFINITY | |
1722 | if (*(p - 1) == 0x7fff) | |
1723 | { | |
66b6d60b RS |
1724 | #ifdef NANS |
1725 | if (eiisnan (a)) | |
1726 | { | |
29e11dab | 1727 | enan (b, eiisneg (a)); |
66b6d60b RS |
1728 | return; |
1729 | } | |
1730 | #endif | |
985b6196 | 1731 | einfin (b); |
842fbaaa | 1732 | return; |
985b6196 RS |
1733 | } |
1734 | #endif | |
1735 | /* skip over guard word */ | |
1736 | ++p; | |
1737 | /* move the significand */ | |
239b043b | 1738 | for (j = 0; j < NE - 1; j++) |
985b6196 RS |
1739 | *q-- = *p++; |
1740 | } | |
1741 | ||
8c35bbc5 | 1742 | /* Clear out exploded e-type number XI. */ |
985b6196 | 1743 | |
a0353055 | 1744 | static void |
985b6196 RS |
1745 | ecleaz (xi) |
1746 | register unsigned EMUSHORT *xi; | |
1747 | { | |
1748 | register int i; | |
1749 | ||
1750 | for (i = 0; i < NI; i++) | |
1751 | *xi++ = 0; | |
1752 | } | |
1753 | ||
0f41302f | 1754 | /* Clear out exploded e-type XI, but don't touch the sign. */ |
985b6196 | 1755 | |
a0353055 | 1756 | static void |
985b6196 RS |
1757 | ecleazs (xi) |
1758 | register unsigned EMUSHORT *xi; | |
1759 | { | |
1760 | register int i; | |
1761 | ||
1762 | ++xi; | |
1763 | for (i = 0; i < NI - 1; i++) | |
1764 | *xi++ = 0; | |
1765 | } | |
1766 | ||
8c35bbc5 | 1767 | /* Move exploded e-type number from A to B. */ |
a0353055 RK |
1768 | |
1769 | static void | |
985b6196 RS |
1770 | emovz (a, b) |
1771 | register unsigned EMUSHORT *a, *b; | |
1772 | { | |
1773 | register int i; | |
1774 | ||
1775 | for (i = 0; i < NI - 1; i++) | |
1776 | *b++ = *a++; | |
1777 | /* clear low guard word */ | |
1778 | *b = 0; | |
1779 | } | |
1780 | ||
8c35bbc5 | 1781 | /* Generate exploded e-type NaN. |
66b6d60b | 1782 | The explicit pattern for this is maximum exponent and |
defb5dab | 1783 | top two significant bits set. */ |
66b6d60b | 1784 | |
a0353055 | 1785 | static void |
66b6d60b RS |
1786 | einan (x) |
1787 | unsigned EMUSHORT x[]; | |
1788 | { | |
1789 | ||
1790 | ecleaz (x); | |
1791 | x[E] = 0x7fff; | |
1792 | x[M + 1] = 0xc000; | |
1793 | } | |
1794 | ||
0f41302f | 1795 | /* Return nonzero if exploded e-type X is a NaN. */ |
66b6d60b | 1796 | |
a0353055 | 1797 | static int |
66b6d60b RS |
1798 | eiisnan (x) |
1799 | unsigned EMUSHORT x[]; | |
1800 | { | |
1801 | int i; | |
1802 | ||
1803 | if ((x[E] & 0x7fff) == 0x7fff) | |
1804 | { | |
1805 | for (i = M + 1; i < NI; i++) | |
1806 | { | |
1807 | if (x[i] != 0) | |
1808 | return (1); | |
1809 | } | |
1810 | } | |
1811 | return (0); | |
1812 | } | |
1813 | ||
8c35bbc5 | 1814 | /* Return nonzero if sign of exploded e-type X is nonzero. */ |
29e11dab | 1815 | |
a0353055 | 1816 | static int |
29e11dab RK |
1817 | eiisneg (x) |
1818 | unsigned EMUSHORT x[]; | |
1819 | { | |
1820 | ||
1821 | return x[0] != 0; | |
1822 | } | |
1823 | ||
8c35bbc5 | 1824 | /* Fill exploded e-type X with infinity pattern. |
66b6d60b RS |
1825 | This has maximum exponent and significand all zeros. */ |
1826 | ||
a0353055 | 1827 | static void |
66b6d60b RS |
1828 | eiinfin (x) |
1829 | unsigned EMUSHORT x[]; | |
1830 | { | |
1831 | ||
1832 | ecleaz (x); | |
1833 | x[E] = 0x7fff; | |
1834 | } | |
1835 | ||
0f41302f | 1836 | /* Return nonzero if exploded e-type X is infinite. */ |
66b6d60b | 1837 | |
a0353055 | 1838 | static int |
66b6d60b RS |
1839 | eiisinf (x) |
1840 | unsigned EMUSHORT x[]; | |
1841 | { | |
1842 | ||
1843 | #ifdef NANS | |
1844 | if (eiisnan (x)) | |
1845 | return (0); | |
1846 | #endif | |
1847 | if ((x[E] & 0x7fff) == 0x7fff) | |
1848 | return (1); | |
1849 | return (0); | |
1850 | } | |
1851 | ||
985b6196 | 1852 | |
8c35bbc5 | 1853 | /* Compare significands of numbers in internal exploded e-type format. |
defb5dab RK |
1854 | Guard words are included in the comparison. |
1855 | ||
1856 | Returns +1 if a > b | |
1857 | 0 if a == b | |
1858 | -1 if a < b */ | |
a0353055 RK |
1859 | |
1860 | static int | |
985b6196 RS |
1861 | ecmpm (a, b) |
1862 | register unsigned EMUSHORT *a, *b; | |
1863 | { | |
1864 | int i; | |
1865 | ||
1866 | a += M; /* skip up to significand area */ | |
1867 | b += M; | |
1868 | for (i = M; i < NI; i++) | |
1869 | { | |
1870 | if (*a++ != *b++) | |
1871 | goto difrnt; | |
1872 | } | |
1873 | return (0); | |
1874 | ||
1875 | difrnt: | |
1876 | if (*(--a) > *(--b)) | |
1877 | return (1); | |
1878 | else | |
1879 | return (-1); | |
1880 | } | |
1881 | ||
8c35bbc5 | 1882 | /* Shift significand of exploded e-type X down by 1 bit. */ |
985b6196 | 1883 | |
a0353055 | 1884 | static void |
985b6196 RS |
1885 | eshdn1 (x) |
1886 | register unsigned EMUSHORT *x; | |
1887 | { | |
1888 | register unsigned EMUSHORT bits; | |
1889 | int i; | |
1890 | ||
1891 | x += M; /* point to significand area */ | |
1892 | ||
1893 | bits = 0; | |
1894 | for (i = M; i < NI; i++) | |
1895 | { | |
1896 | if (*x & 1) | |
1897 | bits |= 1; | |
1898 | *x >>= 1; | |
1899 | if (bits & 2) | |
1900 | *x |= 0x8000; | |
1901 | bits <<= 1; | |
1902 | ++x; | |
1903 | } | |
1904 | } | |
1905 | ||
8c35bbc5 | 1906 | /* Shift significand of exploded e-type X up by 1 bit. */ |
985b6196 | 1907 | |
a0353055 | 1908 | static void |
985b6196 RS |
1909 | eshup1 (x) |
1910 | register unsigned EMUSHORT *x; | |
1911 | { | |
1912 | register unsigned EMUSHORT bits; | |
1913 | int i; | |
1914 | ||
1915 | x += NI - 1; | |
1916 | bits = 0; | |
1917 | ||
1918 | for (i = M; i < NI; i++) | |
1919 | { | |
1920 | if (*x & 0x8000) | |
1921 | bits |= 1; | |
1922 | *x <<= 1; | |
1923 | if (bits & 2) | |
1924 | *x |= 1; | |
1925 | bits <<= 1; | |
1926 | --x; | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | ||
8c35bbc5 | 1931 | /* Shift significand of exploded e-type X down by 8 bits. */ |
985b6196 | 1932 | |
a0353055 | 1933 | static void |
985b6196 RS |
1934 | eshdn8 (x) |
1935 | register unsigned EMUSHORT *x; | |
1936 | { | |
1937 | register unsigned EMUSHORT newbyt, oldbyt; | |
1938 | int i; | |
1939 | ||
1940 | x += M; | |
1941 | oldbyt = 0; | |
1942 | for (i = M; i < NI; i++) | |
1943 | { | |
1944 | newbyt = *x << 8; | |
1945 | *x >>= 8; | |
1946 | *x |= oldbyt; | |
1947 | oldbyt = newbyt; | |
1948 | ++x; | |
1949 | } | |
1950 | } | |
1951 | ||
8c35bbc5 | 1952 | /* Shift significand of exploded e-type X up by 8 bits. */ |
985b6196 | 1953 | |
a0353055 | 1954 | static void |
985b6196 RS |
1955 | eshup8 (x) |
1956 | register unsigned EMUSHORT *x; | |
1957 | { | |
1958 | int i; | |
1959 | register unsigned EMUSHORT newbyt, oldbyt; | |
1960 | ||
1961 | x += NI - 1; | |
1962 | oldbyt = 0; | |
1963 | ||
1964 | for (i = M; i < NI; i++) | |
1965 | { | |
1966 | newbyt = *x >> 8; | |
1967 | *x <<= 8; | |
1968 | *x |= oldbyt; | |
1969 | oldbyt = newbyt; | |
1970 | --x; | |
1971 | } | |
1972 | } | |
1973 | ||
8c35bbc5 | 1974 | /* Shift significand of exploded e-type X up by 16 bits. */ |
985b6196 | 1975 | |
a0353055 | 1976 | static void |
985b6196 RS |
1977 | eshup6 (x) |
1978 | register unsigned EMUSHORT *x; | |
1979 | { | |
1980 | int i; | |
1981 | register unsigned EMUSHORT *p; | |
1982 | ||
1983 | p = x + M; | |
1984 | x += M + 1; | |
1985 | ||
1986 | for (i = M; i < NI - 1; i++) | |
1987 | *p++ = *x++; | |
1988 | ||
1989 | *p = 0; | |
1990 | } | |
1991 | ||
8c35bbc5 | 1992 | /* Shift significand of exploded e-type X down by 16 bits. */ |
985b6196 | 1993 | |
a0353055 | 1994 | static void |
985b6196 RS |
1995 | eshdn6 (x) |
1996 | register unsigned EMUSHORT *x; | |
1997 | { | |
1998 | int i; | |
1999 | register unsigned EMUSHORT *p; | |
2000 | ||
2001 | x += NI - 1; | |
2002 | p = x + 1; | |
2003 | ||
2004 | for (i = M; i < NI - 1; i++) | |
2005 | *(--p) = *(--x); | |
2006 | ||
2007 | *(--p) = 0; | |
2008 | } | |
8c35bbc5 RK |
2009 | |
2010 | /* Add significands of exploded e-type X and Y. X + Y replaces Y. */ | |
985b6196 | 2011 | |
a0353055 | 2012 | static void |
985b6196 RS |
2013 | eaddm (x, y) |
2014 | unsigned EMUSHORT *x, *y; | |
2015 | { | |
2016 | register unsigned EMULONG a; | |
2017 | int i; | |
2018 | unsigned int carry; | |
2019 | ||
2020 | x += NI - 1; | |
2021 | y += NI - 1; | |
2022 | carry = 0; | |
2023 | for (i = M; i < NI; i++) | |
2024 | { | |
2025 | a = (unsigned EMULONG) (*x) + (unsigned EMULONG) (*y) + carry; | |
2026 | if (a & 0x10000) | |
2027 | carry = 1; | |
2028 | else | |
2029 | carry = 0; | |
2030 | *y = (unsigned EMUSHORT) a; | |
2031 | --x; | |
2032 | --y; | |
2033 | } | |
2034 | } | |
2035 | ||
8c35bbc5 | 2036 | /* Subtract significands of exploded e-type X and Y. Y - X replaces Y. */ |
985b6196 | 2037 | |
a0353055 | 2038 | static void |
985b6196 RS |
2039 | esubm (x, y) |
2040 | unsigned EMUSHORT *x, *y; | |
2041 | { | |
2042 | unsigned EMULONG a; | |
2043 | int i; | |
2044 | unsigned int carry; | |
2045 | ||
2046 | x += NI - 1; | |
2047 | y += NI - 1; | |
2048 | carry = 0; | |
2049 | for (i = M; i < NI; i++) | |
2050 | { | |
2051 | a = (unsigned EMULONG) (*y) - (unsigned EMULONG) (*x) - carry; | |
2052 | if (a & 0x10000) | |
2053 | carry = 1; | |
2054 | else | |
2055 | carry = 0; | |
2056 | *y = (unsigned EMUSHORT) a; | |
2057 | --x; | |
2058 | --y; | |
2059 | } | |
2060 | } | |
2061 | ||
2062 | ||
985b6196 RS |
2063 | static unsigned EMUSHORT equot[NI]; |
2064 | ||
842fbaaa JW |
2065 | |
2066 | #if 0 | |
2067 | /* Radix 2 shift-and-add versions of multiply and divide */ | |
2068 | ||
2069 | ||
2070 | /* Divide significands */ | |
2071 | ||
985b6196 RS |
2072 | int |
2073 | edivm (den, num) | |
2074 | unsigned EMUSHORT den[], num[]; | |
2075 | { | |
2076 | int i; | |
2077 | register unsigned EMUSHORT *p, *q; | |
2078 | unsigned EMUSHORT j; | |
2079 | ||
2080 | p = &equot[0]; | |
2081 | *p++ = num[0]; | |
2082 | *p++ = num[1]; | |
2083 | ||
2084 | for (i = M; i < NI; i++) | |
2085 | { | |
2086 | *p++ = 0; | |
2087 | } | |
2088 | ||
defb5dab RK |
2089 | /* Use faster compare and subtraction if denominator has only 15 bits of |
2090 | significance. */ | |
2091 | ||
985b6196 RS |
2092 | p = &den[M + 2]; |
2093 | if (*p++ == 0) | |
2094 | { | |
2095 | for (i = M + 3; i < NI; i++) | |
2096 | { | |
2097 | if (*p++ != 0) | |
2098 | goto fulldiv; | |
2099 | } | |
2100 | if ((den[M + 1] & 1) != 0) | |
2101 | goto fulldiv; | |
2102 | eshdn1 (num); | |
2103 | eshdn1 (den); | |
2104 | ||
2105 | p = &den[M + 1]; | |
2106 | q = &num[M + 1]; | |
2107 | ||
2108 | for (i = 0; i < NBITS + 2; i++) | |
2109 | { | |
2110 | if (*p <= *q) | |
2111 | { | |
2112 | *q -= *p; | |
2113 | j = 1; | |
2114 | } | |
2115 | else | |
2116 | { | |
2117 | j = 0; | |
2118 | } | |
2119 | eshup1 (equot); | |
2120 | equot[NI - 2] |= j; | |
2121 | eshup1 (num); | |
2122 | } | |
2123 | goto divdon; | |
2124 | } | |
2125 | ||
defb5dab RK |
2126 | /* The number of quotient bits to calculate is NBITS + 1 scaling guard |
2127 | bit + 1 roundoff bit. */ | |
2128 | ||
985b6196 RS |
2129 | fulldiv: |
2130 | ||
2131 | p = &equot[NI - 2]; | |
2132 | for (i = 0; i < NBITS + 2; i++) | |
2133 | { | |
2134 | if (ecmpm (den, num) <= 0) | |
2135 | { | |
2136 | esubm (den, num); | |
2137 | j = 1; /* quotient bit = 1 */ | |
2138 | } | |
2139 | else | |
2140 | j = 0; | |
2141 | eshup1 (equot); | |
2142 | *p |= j; | |
2143 | eshup1 (num); | |
2144 | } | |
2145 | ||
2146 | divdon: | |
2147 | ||
2148 | eshdn1 (equot); | |
2149 | eshdn1 (equot); | |
2150 | ||
2151 | /* test for nonzero remainder after roundoff bit */ | |
2152 | p = &num[M]; | |
2153 | j = 0; | |
2154 | for (i = M; i < NI; i++) | |
2155 | { | |
2156 | j |= *p++; | |
2157 | } | |
2158 | if (j) | |
2159 | j = 1; | |
2160 | ||
2161 | ||
2162 | for (i = 0; i < NI; i++) | |
2163 | num[i] = equot[i]; | |
2164 | return ((int) j); | |
2165 | } | |
2166 | ||
2167 | ||
2168 | /* Multiply significands */ | |
0f41302f | 2169 | |
985b6196 RS |
2170 | int |
2171 | emulm (a, b) | |
2172 | unsigned EMUSHORT a[], b[]; | |
2173 | { | |
2174 | unsigned EMUSHORT *p, *q; | |
2175 | int i, j, k; | |
2176 | ||
2177 | equot[0] = b[0]; | |
2178 | equot[1] = b[1]; | |
2179 | for (i = M; i < NI; i++) | |
2180 | equot[i] = 0; | |
2181 | ||
2182 | p = &a[NI - 2]; | |
2183 | k = NBITS; | |
defb5dab | 2184 | while (*p == 0) /* significand is not supposed to be zero */ |
985b6196 RS |
2185 | { |
2186 | eshdn6 (a); | |
2187 | k -= 16; | |
2188 | } | |
2189 | if ((*p & 0xff) == 0) | |
2190 | { | |
2191 | eshdn8 (a); | |
2192 | k -= 8; | |
2193 | } | |
2194 | ||
2195 | q = &equot[NI - 1]; | |
2196 | j = 0; | |
2197 | for (i = 0; i < k; i++) | |
2198 | { | |
2199 | if (*p & 1) | |
2200 | eaddm (b, equot); | |
2201 | /* remember if there were any nonzero bits shifted out */ | |
2202 | if (*q & 1) | |
2203 | j |= 1; | |
2204 | eshdn1 (a); | |
2205 | eshdn1 (equot); | |
2206 | } | |
2207 | ||
2208 | for (i = 0; i < NI; i++) | |
2209 | b[i] = equot[i]; | |
2210 | ||
2211 | /* return flag for lost nonzero bits */ | |
2212 | return (j); | |
2213 | } | |
2214 | ||
842fbaaa JW |
2215 | #else |
2216 | ||
8c35bbc5 | 2217 | /* Radix 65536 versions of multiply and divide. */ |
842fbaaa | 2218 | |
8c35bbc5 | 2219 | /* Multiply significand of e-type number B |
0f41302f | 2220 | by 16-bit quantity A, return e-type result to C. */ |
842fbaaa | 2221 | |
a0353055 | 2222 | static void |
242cef1e | 2223 | m16m (a, b, c) |
c92d992a | 2224 | unsigned int a; |
8c35bbc5 | 2225 | unsigned EMUSHORT b[], c[]; |
842fbaaa | 2226 | { |
8c35bbc5 RK |
2227 | register unsigned EMUSHORT *pp; |
2228 | register unsigned EMULONG carry; | |
2229 | unsigned EMUSHORT *ps; | |
2230 | unsigned EMUSHORT p[NI]; | |
2231 | unsigned EMULONG aa, m; | |
242cef1e RS |
2232 | int i; |
2233 | ||
2234 | aa = a; | |
2235 | pp = &p[NI-2]; | |
2236 | *pp++ = 0; | |
2237 | *pp = 0; | |
2238 | ps = &b[NI-1]; | |
2239 | ||
2240 | for (i=M+1; i<NI; i++) | |
2241 | { | |
2242 | if (*ps == 0) | |
842fbaaa | 2243 | { |
242cef1e RS |
2244 | --ps; |
2245 | --pp; | |
2246 | *(pp-1) = 0; | |
842fbaaa | 2247 | } |
242cef1e RS |
2248 | else |
2249 | { | |
8c35bbc5 | 2250 | m = (unsigned EMULONG) aa * *ps--; |
242cef1e | 2251 | carry = (m & 0xffff) + *pp; |
8c35bbc5 | 2252 | *pp-- = (unsigned EMUSHORT)carry; |
242cef1e | 2253 | carry = (carry >> 16) + (m >> 16) + *pp; |
8c35bbc5 | 2254 | *pp = (unsigned EMUSHORT)carry; |
242cef1e RS |
2255 | *(pp-1) = carry >> 16; |
2256 | } | |
2257 | } | |
2258 | for (i=M; i<NI; i++) | |
2259 | c[i] = p[i]; | |
842fbaaa JW |
2260 | } |
2261 | ||
8c35bbc5 RK |
2262 | /* Divide significands of exploded e-types NUM / DEN. Neither the |
2263 | numerator NUM nor the denominator DEN is permitted to have its high guard | |
2264 | word nonzero. */ | |
842fbaaa | 2265 | |
a0353055 | 2266 | static int |
242cef1e | 2267 | edivm (den, num) |
8c35bbc5 | 2268 | unsigned EMUSHORT den[], num[]; |
842fbaaa | 2269 | { |
242cef1e | 2270 | int i; |
8c35bbc5 RK |
2271 | register unsigned EMUSHORT *p; |
2272 | unsigned EMULONG tnum; | |
2273 | unsigned EMUSHORT j, tdenm, tquot; | |
2274 | unsigned EMUSHORT tprod[NI+1]; | |
842fbaaa | 2275 | |
242cef1e RS |
2276 | p = &equot[0]; |
2277 | *p++ = num[0]; | |
2278 | *p++ = num[1]; | |
842fbaaa | 2279 | |
242cef1e RS |
2280 | for (i=M; i<NI; i++) |
2281 | { | |
2282 | *p++ = 0; | |
2283 | } | |
2284 | eshdn1 (num); | |
2285 | tdenm = den[M+1]; | |
2286 | for (i=M; i<NI; i++) | |
2287 | { | |
0f41302f | 2288 | /* Find trial quotient digit (the radix is 65536). */ |
8c35bbc5 | 2289 | tnum = (((unsigned EMULONG) num[M]) << 16) + num[M+1]; |
242cef1e | 2290 | |
0f41302f | 2291 | /* Do not execute the divide instruction if it will overflow. */ |
242cef1e RS |
2292 | if ((tdenm * 0xffffL) < tnum) |
2293 | tquot = 0xffff; | |
2294 | else | |
2295 | tquot = tnum / tdenm; | |
0f41302f | 2296 | /* Multiply denominator by trial quotient digit. */ |
c92d992a | 2297 | m16m ((unsigned int)tquot, den, tprod); |
0f41302f | 2298 | /* The quotient digit may have been overestimated. */ |
242cef1e | 2299 | if (ecmpm (tprod, num) > 0) |
842fbaaa | 2300 | { |
242cef1e RS |
2301 | tquot -= 1; |
2302 | esubm (den, tprod); | |
2303 | if (ecmpm (tprod, num) > 0) | |
2304 | { | |
2305 | tquot -= 1; | |
2306 | esubm (den, tprod); | |
2307 | } | |
842fbaaa | 2308 | } |
242cef1e RS |
2309 | esubm (tprod, num); |
2310 | equot[i] = tquot; | |
2311 | eshup6(num); | |
2312 | } | |
2313 | /* test for nonzero remainder after roundoff bit */ | |
2314 | p = &num[M]; | |
2315 | j = 0; | |
2316 | for (i=M; i<NI; i++) | |
2317 | { | |
2318 | j |= *p++; | |
2319 | } | |
2320 | if (j) | |
2321 | j = 1; | |
842fbaaa | 2322 | |
242cef1e RS |
2323 | for (i=0; i<NI; i++) |
2324 | num[i] = equot[i]; | |
842fbaaa | 2325 | |
242cef1e | 2326 | return ((int)j); |
842fbaaa JW |
2327 | } |
2328 | ||
8c35bbc5 | 2329 | /* Multiply significands of exploded e-type A and B, result in B. */ |
842fbaaa | 2330 | |
a0353055 | 2331 | static int |
242cef1e | 2332 | emulm (a, b) |
8c35bbc5 | 2333 | unsigned EMUSHORT a[], b[]; |
842fbaaa | 2334 | { |
8c35bbc5 RK |
2335 | unsigned EMUSHORT *p, *q; |
2336 | unsigned EMUSHORT pprod[NI]; | |
2337 | unsigned EMUSHORT j; | |
242cef1e RS |
2338 | int i; |
2339 | ||
2340 | equot[0] = b[0]; | |
2341 | equot[1] = b[1]; | |
2342 | for (i=M; i<NI; i++) | |
2343 | equot[i] = 0; | |
2344 | ||
2345 | j = 0; | |
2346 | p = &a[NI-1]; | |
2347 | q = &equot[NI-1]; | |
2348 | for (i=M+1; i<NI; i++) | |
2349 | { | |
2350 | if (*p == 0) | |
842fbaaa | 2351 | { |
242cef1e RS |
2352 | --p; |
2353 | } | |
2354 | else | |
2355 | { | |
c92d992a | 2356 | m16m ((unsigned int) *p--, b, pprod); |
242cef1e | 2357 | eaddm(pprod, equot); |
842fbaaa | 2358 | } |
242cef1e RS |
2359 | j |= *q; |
2360 | eshdn6(equot); | |
2361 | } | |
842fbaaa | 2362 | |
242cef1e RS |
2363 | for (i=0; i<NI; i++) |
2364 | b[i] = equot[i]; | |
842fbaaa | 2365 | |
242cef1e RS |
2366 | /* return flag for lost nonzero bits */ |
2367 | return ((int)j); | |
842fbaaa JW |
2368 | } |
2369 | #endif | |
985b6196 RS |
2370 | |
2371 | ||
defb5dab | 2372 | /* Normalize and round off. |
985b6196 | 2373 | |
8c35bbc5 RK |
2374 | The internal format number to be rounded is S. |
2375 | Input LOST is 0 if the value is exact. This is the so-called sticky bit. | |
defb5dab | 2376 | |
8c35bbc5 RK |
2377 | Input SUBFLG indicates whether the number was obtained |
2378 | by a subtraction operation. In that case if LOST is nonzero | |
defb5dab RK |
2379 | then the number is slightly smaller than indicated. |
2380 | ||
8c35bbc5 RK |
2381 | Input EXP is the biased exponent, which may be negative. |
2382 | the exponent field of S is ignored but is replaced by | |
2383 | EXP as adjusted by normalization and rounding. | |
defb5dab | 2384 | |
8c35bbc5 RK |
2385 | Input RCNTRL is the rounding control. If it is nonzero, the |
2386 | returned value will be rounded to RNDPRC bits. | |
defb5dab RK |
2387 | |
2388 | For future reference: In order for emdnorm to round off denormal | |
842fbaaa JW |
2389 | significands at the right point, the input exponent must be |
2390 | adjusted to be the actual value it would have after conversion to | |
2391 | the final floating point type. This adjustment has been | |
2392 | implemented for all type conversions (etoe53, etc.) and decimal | |
2393 | conversions, but not for the arithmetic functions (eadd, etc.). | |
2394 | Data types having standard 15-bit exponents are not affected by | |
2395 | this, but SFmode and DFmode are affected. For example, ediv with | |
2396 | rndprc = 24 will not round correctly to 24-bit precision if the | |
2397 | result is denormal. */ | |
2398 | ||
985b6196 RS |
2399 | static int rlast = -1; |
2400 | static int rw = 0; | |
2401 | static unsigned EMUSHORT rmsk = 0; | |
2402 | static unsigned EMUSHORT rmbit = 0; | |
2403 | static unsigned EMUSHORT rebit = 0; | |
2404 | static int re = 0; | |
2405 | static unsigned EMUSHORT rbit[NI]; | |
2406 | ||
a0353055 | 2407 | static void |
985b6196 RS |
2408 | emdnorm (s, lost, subflg, exp, rcntrl) |
2409 | unsigned EMUSHORT s[]; | |
2410 | int lost; | |
2411 | int subflg; | |
2412 | EMULONG exp; | |
2413 | int rcntrl; | |
2414 | { | |
2415 | int i, j; | |
2416 | unsigned EMUSHORT r; | |
2417 | ||
2418 | /* Normalize */ | |
2419 | j = enormlz (s); | |
2420 | ||
0f41302f | 2421 | /* a blank significand could mean either zero or infinity. */ |
985b6196 RS |
2422 | #ifndef INFINITY |
2423 | if (j > NBITS) | |
2424 | { | |
2425 | ecleazs (s); | |
2426 | return; | |
2427 | } | |
2428 | #endif | |
2429 | exp -= j; | |
2430 | #ifndef INFINITY | |
2431 | if (exp >= 32767L) | |
2432 | goto overf; | |
2433 | #else | |
2434 | if ((j > NBITS) && (exp < 32767)) | |
2435 | { | |
2436 | ecleazs (s); | |
2437 | return; | |
2438 | } | |
2439 | #endif | |
2440 | if (exp < 0L) | |
2441 | { | |
2442 | if (exp > (EMULONG) (-NBITS - 1)) | |
2443 | { | |
2444 | j = (int) exp; | |
2445 | i = eshift (s, j); | |
2446 | if (i) | |
2447 | lost = 1; | |
2448 | } | |
2449 | else | |
2450 | { | |
2451 | ecleazs (s); | |
2452 | return; | |
2453 | } | |
2454 | } | |
0f41302f | 2455 | /* Round off, unless told not to by rcntrl. */ |
985b6196 RS |
2456 | if (rcntrl == 0) |
2457 | goto mdfin; | |
0f41302f | 2458 | /* Set up rounding parameters if the control register changed. */ |
985b6196 RS |
2459 | if (rndprc != rlast) |
2460 | { | |
2461 | ecleaz (rbit); | |
2462 | switch (rndprc) | |
2463 | { | |
2464 | default: | |
2465 | case NBITS: | |
2466 | rw = NI - 1; /* low guard word */ | |
2467 | rmsk = 0xffff; | |
2468 | rmbit = 0x8000; | |
842fbaaa | 2469 | re = rw - 1; |
985b6196 RS |
2470 | rebit = 1; |
2471 | break; | |
f5963e61 | 2472 | |
842fbaaa JW |
2473 | case 113: |
2474 | rw = 10; | |
2475 | rmsk = 0x7fff; | |
2476 | rmbit = 0x4000; | |
2477 | rebit = 0x8000; | |
2478 | re = rw; | |
2479 | break; | |
f5963e61 | 2480 | |
985b6196 RS |
2481 | case 64: |
2482 | rw = 7; | |
2483 | rmsk = 0xffff; | |
2484 | rmbit = 0x8000; | |
985b6196 RS |
2485 | re = rw - 1; |
2486 | rebit = 1; | |
2487 | break; | |
f5963e61 | 2488 | |
842fbaaa | 2489 | /* For DEC or IBM arithmetic */ |
985b6196 RS |
2490 | case 56: |
2491 | rw = 6; | |
2492 | rmsk = 0xff; | |
2493 | rmbit = 0x80; | |
985b6196 | 2494 | rebit = 0x100; |
842fbaaa | 2495 | re = rw; |
985b6196 | 2496 | break; |
f5963e61 | 2497 | |
985b6196 RS |
2498 | case 53: |
2499 | rw = 6; | |
2500 | rmsk = 0x7ff; | |
2501 | rmbit = 0x0400; | |
985b6196 | 2502 | rebit = 0x800; |
842fbaaa | 2503 | re = rw; |
985b6196 | 2504 | break; |
f5963e61 JL |
2505 | |
2506 | /* For C4x arithmetic */ | |
2507 | case 32: | |
2508 | rw = 5; | |
2509 | rmsk = 0xffff; | |
2510 | rmbit = 0x8000; | |
2511 | rebit = 1; | |
2512 | re = rw - 1; | |
2513 | break; | |
2514 | ||
985b6196 RS |
2515 | case 24: |
2516 | rw = 4; | |
2517 | rmsk = 0xff; | |
2518 | rmbit = 0x80; | |
985b6196 | 2519 | rebit = 0x100; |
842fbaaa | 2520 | re = rw; |
985b6196 RS |
2521 | break; |
2522 | } | |
842fbaaa | 2523 | rbit[re] = rebit; |
985b6196 RS |
2524 | rlast = rndprc; |
2525 | } | |
2526 | ||
842fbaaa | 2527 | /* Shift down 1 temporarily if the data structure has an implied |
d730ef29 RK |
2528 | most significant bit and the number is denormal. |
2529 | Intel long double denormals also lose one bit of precision. */ | |
2530 | if ((exp <= 0) && (rndprc != NBITS) | |
2531 | && ((rndprc != 64) || ((rndprc == 64) && ! REAL_WORDS_BIG_ENDIAN))) | |
985b6196 | 2532 | { |
842fbaaa JW |
2533 | lost |= s[NI - 1] & 1; |
2534 | eshdn1 (s); | |
985b6196 | 2535 | } |
842fbaaa JW |
2536 | /* Clear out all bits below the rounding bit, |
2537 | remembering in r if any were nonzero. */ | |
2538 | r = s[rw] & rmsk; | |
2539 | if (rndprc < NBITS) | |
985b6196 | 2540 | { |
985b6196 RS |
2541 | i = rw + 1; |
2542 | while (i < NI) | |
2543 | { | |
2544 | if (s[i]) | |
2545 | r |= 1; | |
2546 | s[i] = 0; | |
2547 | ++i; | |
2548 | } | |
985b6196 | 2549 | } |
afb817fd | 2550 | s[rw] &= ~rmsk; |
985b6196 RS |
2551 | if ((r & rmbit) != 0) |
2552 | { | |
2553 | if (r == rmbit) | |
2554 | { | |
2555 | if (lost == 0) | |
2556 | { /* round to even */ | |
2557 | if ((s[re] & rebit) == 0) | |
2558 | goto mddone; | |
2559 | } | |
2560 | else | |
2561 | { | |
2562 | if (subflg != 0) | |
2563 | goto mddone; | |
2564 | } | |
2565 | } | |
2566 | eaddm (rbit, s); | |
2567 | } | |
2568 | mddone: | |
0f41302f | 2569 | /* Undo the temporary shift for denormal values. */ |
d730ef29 RK |
2570 | if ((exp <= 0) && (rndprc != NBITS) |
2571 | && ((rndprc != 64) || ((rndprc == 64) && ! REAL_WORDS_BIG_ENDIAN))) | |
985b6196 RS |
2572 | { |
2573 | eshup1 (s); | |
2574 | } | |
2575 | if (s[2] != 0) | |
2576 | { /* overflow on roundoff */ | |
2577 | eshdn1 (s); | |
2578 | exp += 1; | |
2579 | } | |
2580 | mdfin: | |
2581 | s[NI - 1] = 0; | |
2582 | if (exp >= 32767L) | |
2583 | { | |
2584 | #ifndef INFINITY | |
2585 | overf: | |
2586 | #endif | |
2587 | #ifdef INFINITY | |
2588 | s[1] = 32767; | |
2589 | for (i = 2; i < NI - 1; i++) | |
2590 | s[i] = 0; | |
64685ffa RS |
2591 | if (extra_warnings) |
2592 | warning ("floating point overflow"); | |
985b6196 RS |
2593 | #else |
2594 | s[1] = 32766; | |
2595 | s[2] = 0; | |
2596 | for (i = M + 1; i < NI - 1; i++) | |
2597 | s[i] = 0xffff; | |
2598 | s[NI - 1] = 0; | |
842fbaaa | 2599 | if ((rndprc < 64) || (rndprc == 113)) |
985b6196 RS |
2600 | { |
2601 | s[rw] &= ~rmsk; | |
2602 | if (rndprc == 24) | |
2603 | { | |
2604 | s[5] = 0; | |
2605 | s[6] = 0; | |
2606 | } | |
2607 | } | |
2608 | #endif | |
2609 | return; | |
2610 | } | |
2611 | if (exp < 0) | |
2612 | s[1] = 0; | |
2613 | else | |
2614 | s[1] = (unsigned EMUSHORT) exp; | |
2615 | } | |
2616 | ||
8c35bbc5 | 2617 | /* Subtract. C = B - A, all e type numbers. */ |
985b6196 RS |
2618 | |
2619 | static int subflg = 0; | |
2620 | ||
a0353055 | 2621 | static void |
985b6196 RS |
2622 | esub (a, b, c) |
2623 | unsigned EMUSHORT *a, *b, *c; | |
2624 | { | |
2625 | ||
66b6d60b RS |
2626 | #ifdef NANS |
2627 | if (eisnan (a)) | |
2628 | { | |
2629 | emov (a, c); | |
2630 | return; | |
2631 | } | |
2632 | if (eisnan (b)) | |
2633 | { | |
2634 | emov (b, c); | |
2635 | return; | |
2636 | } | |
2637 | /* Infinity minus infinity is a NaN. | |
0f41302f | 2638 | Test for subtracting infinities of the same sign. */ |
66b6d60b RS |
2639 | if (eisinf (a) && eisinf (b) |
2640 | && ((eisneg (a) ^ eisneg (b)) == 0)) | |
2641 | { | |
2642 | mtherr ("esub", INVALID); | |
29e11dab | 2643 | enan (c, 0); |
66b6d60b RS |
2644 | return; |
2645 | } | |
2646 | #endif | |
985b6196 RS |
2647 | subflg = 1; |
2648 | eadd1 (a, b, c); | |
2649 | } | |
2650 | ||
0f41302f | 2651 | /* Add. C = A + B, all e type. */ |
a0353055 RK |
2652 | |
2653 | static void | |
985b6196 RS |
2654 | eadd (a, b, c) |
2655 | unsigned EMUSHORT *a, *b, *c; | |
2656 | { | |
2657 | ||
66b6d60b | 2658 | #ifdef NANS |
0f41302f | 2659 | /* NaN plus anything is a NaN. */ |
66b6d60b RS |
2660 | if (eisnan (a)) |
2661 | { | |
2662 | emov (a, c); | |
2663 | return; | |
2664 | } | |
2665 | if (eisnan (b)) | |
2666 | { | |
2667 | emov (b, c); | |
2668 | return; | |
2669 | } | |
2670 | /* Infinity minus infinity is a NaN. | |
0f41302f | 2671 | Test for adding infinities of opposite signs. */ |
66b6d60b RS |
2672 | if (eisinf (a) && eisinf (b) |
2673 | && ((eisneg (a) ^ eisneg (b)) != 0)) | |
2674 | { | |
2675 | mtherr ("esub", INVALID); | |
29e11dab | 2676 | enan (c, 0); |
66b6d60b RS |
2677 | return; |
2678 | } | |
2679 | #endif | |
985b6196 RS |
2680 | subflg = 0; |
2681 | eadd1 (a, b, c); | |
2682 | } | |
2683 | ||
8c35bbc5 RK |
2684 | /* Arithmetic common to both addition and subtraction. */ |
2685 | ||
a0353055 | 2686 | static void |
985b6196 RS |
2687 | eadd1 (a, b, c) |
2688 | unsigned EMUSHORT *a, *b, *c; | |
2689 | { | |
2690 | unsigned EMUSHORT ai[NI], bi[NI], ci[NI]; | |
2691 | int i, lost, j, k; | |
2692 | EMULONG lt, lta, ltb; | |
2693 | ||
2694 | #ifdef INFINITY | |
2695 | if (eisinf (a)) | |
2696 | { | |
2697 | emov (a, c); | |
2698 | if (subflg) | |
2699 | eneg (c); | |
2700 | return; | |
2701 | } | |
2702 | if (eisinf (b)) | |
2703 | { | |
2704 | emov (b, c); | |
2705 | return; | |
2706 | } | |
2707 | #endif | |
2708 | emovi (a, ai); | |
2709 | emovi (b, bi); | |
2710 | if (subflg) | |
2711 | ai[0] = ~ai[0]; | |
2712 | ||
2713 | /* compare exponents */ | |
2714 | lta = ai[E]; | |
2715 | ltb = bi[E]; | |
2716 | lt = lta - ltb; | |
2717 | if (lt > 0L) | |
2718 | { /* put the larger number in bi */ | |
2719 | emovz (bi, ci); | |
2720 | emovz (ai, bi); | |
2721 | emovz (ci, ai); | |
2722 | ltb = bi[E]; | |
2723 | lt = -lt; | |
2724 | } | |
2725 | lost = 0; | |
2726 | if (lt != 0L) | |
2727 | { | |
2728 | if (lt < (EMULONG) (-NBITS - 1)) | |
2729 | goto done; /* answer same as larger addend */ | |
2730 | k = (int) lt; | |
2731 | lost = eshift (ai, k); /* shift the smaller number down */ | |
2732 | } | |
2733 | else | |
2734 | { | |
2735 | /* exponents were the same, so must compare significands */ | |
2736 | i = ecmpm (ai, bi); | |
2737 | if (i == 0) | |
2738 | { /* the numbers are identical in magnitude */ | |
2739 | /* if different signs, result is zero */ | |
2740 | if (ai[0] != bi[0]) | |
2741 | { | |
2742 | eclear (c); | |
2743 | return; | |
2744 | } | |
2745 | /* if same sign, result is double */ | |
9faa82d8 | 2746 | /* double denormalized tiny number */ |
985b6196 RS |
2747 | if ((bi[E] == 0) && ((bi[3] & 0x8000) == 0)) |
2748 | { | |
2749 | eshup1 (bi); | |
2750 | goto done; | |
2751 | } | |
2752 | /* add 1 to exponent unless both are zero! */ | |
2753 | for (j = 1; j < NI - 1; j++) | |
2754 | { | |
2755 | if (bi[j] != 0) | |
2756 | { | |
985b6196 | 2757 | ltb += 1; |
2dedbe1f RK |
2758 | if (ltb >= 0x7fff) |
2759 | { | |
2760 | eclear (c); | |
2761 | if (ai[0] != 0) | |
2762 | eneg (c); | |
2763 | einfin (c); | |
2764 | return; | |
2765 | } | |
985b6196 RS |
2766 | break; |
2767 | } | |
2768 | } | |
2769 | bi[E] = (unsigned EMUSHORT) ltb; | |
2770 | goto done; | |
2771 | } | |
2772 | if (i > 0) | |
2773 | { /* put the larger number in bi */ | |
2774 | emovz (bi, ci); | |
2775 | emovz (ai, bi); | |
2776 | emovz (ci, ai); | |
2777 | } | |
2778 | } | |
2779 | if (ai[0] == bi[0]) | |
2780 | { | |
2781 | eaddm (ai, bi); | |
2782 | subflg = 0; | |
2783 | } | |
2784 | else | |
2785 | { | |
2786 | esubm (ai, bi); | |
2787 | subflg = 1; | |
2788 | } | |
2789 | emdnorm (bi, lost, subflg, ltb, 64); | |
2790 | ||
2791 | done: | |
2792 | emovo (bi, c); | |
2793 | } | |
2794 | ||
8c35bbc5 | 2795 | /* Divide: C = B/A, all e type. */ |
a0353055 RK |
2796 | |
2797 | static void | |
985b6196 RS |
2798 | ediv (a, b, c) |
2799 | unsigned EMUSHORT *a, *b, *c; | |
2800 | { | |
2801 | unsigned EMUSHORT ai[NI], bi[NI]; | |
d56390c4 | 2802 | int i, sign; |
985b6196 RS |
2803 | EMULONG lt, lta, ltb; |
2804 | ||
d56390c4 RK |
2805 | /* IEEE says if result is not a NaN, the sign is "-" if and only if |
2806 | operands have opposite signs -- but flush -0 to 0 later if not IEEE. */ | |
2807 | sign = eisneg(a) ^ eisneg(b); | |
2808 | ||
66b6d60b | 2809 | #ifdef NANS |
0f41302f | 2810 | /* Return any NaN input. */ |
66b6d60b RS |
2811 | if (eisnan (a)) |
2812 | { | |
2813 | emov (a, c); | |
2814 | return; | |
2815 | } | |
2816 | if (eisnan (b)) | |
2817 | { | |
2818 | emov (b, c); | |
2819 | return; | |
2820 | } | |
0f41302f | 2821 | /* Zero over zero, or infinity over infinity, is a NaN. */ |
66b6d60b RS |
2822 | if (((ecmp (a, ezero) == 0) && (ecmp (b, ezero) == 0)) |
2823 | || (eisinf (a) && eisinf (b))) | |
2824 | { | |
2825 | mtherr ("ediv", INVALID); | |
d56390c4 | 2826 | enan (c, sign); |
66b6d60b RS |
2827 | return; |
2828 | } | |
2829 | #endif | |
0f41302f | 2830 | /* Infinity over anything else is infinity. */ |
985b6196 RS |
2831 | #ifdef INFINITY |
2832 | if (eisinf (b)) | |
2833 | { | |
985b6196 | 2834 | einfin (c); |
d56390c4 | 2835 | goto divsign; |
985b6196 | 2836 | } |
0f41302f | 2837 | /* Anything else over infinity is zero. */ |
985b6196 RS |
2838 | if (eisinf (a)) |
2839 | { | |
2840 | eclear (c); | |
d56390c4 | 2841 | goto divsign; |
985b6196 RS |
2842 | } |
2843 | #endif | |
2844 | emovi (a, ai); | |
2845 | emovi (b, bi); | |
2846 | lta = ai[E]; | |
2847 | ltb = bi[E]; | |
2848 | if (bi[E] == 0) | |
0f41302f | 2849 | { /* See if numerator is zero. */ |
985b6196 RS |
2850 | for (i = 1; i < NI - 1; i++) |
2851 | { | |
2852 | if (bi[i] != 0) | |
2853 | { | |
2854 | ltb -= enormlz (bi); | |
2855 | goto dnzro1; | |
2856 | } | |
2857 | } | |
2858 | eclear (c); | |
d56390c4 | 2859 | goto divsign; |
985b6196 RS |
2860 | } |
2861 | dnzro1: | |
2862 | ||
2863 | if (ai[E] == 0) | |
2864 | { /* possible divide by zero */ | |
2865 | for (i = 1; i < NI - 1; i++) | |
2866 | { | |
2867 | if (ai[i] != 0) | |
2868 | { | |
2869 | lta -= enormlz (ai); | |
2870 | goto dnzro2; | |
2871 | } | |
2872 | } | |
66b6d60b RS |
2873 | /* Divide by zero is not an invalid operation. |
2874 | It is a divide-by-zero operation! */ | |
985b6196 RS |
2875 | einfin (c); |
2876 | mtherr ("ediv", SING); | |
d56390c4 | 2877 | goto divsign; |
985b6196 RS |
2878 | } |
2879 | dnzro2: | |
2880 | ||
2881 | i = edivm (ai, bi); | |
2882 | /* calculate exponent */ | |
2883 | lt = ltb - lta + EXONE; | |
2884 | emdnorm (bi, i, 0, lt, 64); | |
985b6196 | 2885 | emovo (bi, c); |
d56390c4 RK |
2886 | |
2887 | divsign: | |
2888 | ||
2889 | if (sign | |
2890 | #ifndef IEEE | |
2891 | && (ecmp (c, ezero) != 0) | |
2892 | #endif | |
2893 | ) | |
2894 | *(c+(NE-1)) |= 0x8000; | |
2895 | else | |
2896 | *(c+(NE-1)) &= ~0x8000; | |
985b6196 RS |
2897 | } |
2898 | ||
8c35bbc5 | 2899 | /* Multiply e-types A and B, return e-type product C. */ |
a0353055 RK |
2900 | |
2901 | static void | |
985b6196 RS |
2902 | emul (a, b, c) |
2903 | unsigned EMUSHORT *a, *b, *c; | |
2904 | { | |
2905 | unsigned EMUSHORT ai[NI], bi[NI]; | |
d56390c4 | 2906 | int i, j, sign; |
985b6196 RS |
2907 | EMULONG lt, lta, ltb; |
2908 | ||
d56390c4 RK |
2909 | /* IEEE says if result is not a NaN, the sign is "-" if and only if |
2910 | operands have opposite signs -- but flush -0 to 0 later if not IEEE. */ | |
2911 | sign = eisneg(a) ^ eisneg(b); | |
2912 | ||
66b6d60b | 2913 | #ifdef NANS |
0f41302f | 2914 | /* NaN times anything is the same NaN. */ |
66b6d60b RS |
2915 | if (eisnan (a)) |
2916 | { | |
2917 | emov (a, c); | |
2918 | return; | |
2919 | } | |
2920 | if (eisnan (b)) | |
2921 | { | |
2922 | emov (b, c); | |
2923 | return; | |
2924 | } | |
0f41302f | 2925 | /* Zero times infinity is a NaN. */ |
66b6d60b RS |
2926 | if ((eisinf (a) && (ecmp (b, ezero) == 0)) |
2927 | || (eisinf (b) && (ecmp (a, ezero) == 0))) | |
2928 | { | |
2929 | mtherr ("emul", INVALID); | |
d56390c4 | 2930 | enan (c, sign); |
66b6d60b RS |
2931 | return; |
2932 | } | |
2933 | #endif | |
0f41302f | 2934 | /* Infinity times anything else is infinity. */ |
985b6196 RS |
2935 | #ifdef INFINITY |
2936 | if (eisinf (a) || eisinf (b)) | |
2937 | { | |
985b6196 | 2938 | einfin (c); |
d56390c4 | 2939 | goto mulsign; |
985b6196 RS |
2940 | } |
2941 | #endif | |
2942 | emovi (a, ai); | |
2943 | emovi (b, bi); | |
2944 | lta = ai[E]; | |
2945 | ltb = bi[E]; | |
2946 | if (ai[E] == 0) | |
2947 | { | |
2948 | for (i = 1; i < NI - 1; i++) | |
2949 | { | |
2950 | if (ai[i] != 0) | |
2951 | { | |
2952 | lta -= enormlz (ai); | |
2953 | goto mnzer1; | |
2954 | } | |
2955 | } | |
2956 | eclear (c); | |
d56390c4 | 2957 | goto mulsign; |
985b6196 RS |
2958 | } |
2959 | mnzer1: | |
2960 | ||
2961 | if (bi[E] == 0) | |
2962 | { | |
2963 | for (i = 1; i < NI - 1; i++) | |
2964 | { | |
2965 | if (bi[i] != 0) | |
2966 | { | |
2967 | ltb -= enormlz (bi); | |
2968 | goto mnzer2; | |
2969 | } | |
2970 | } | |
2971 | eclear (c); | |
d56390c4 | 2972 | goto mulsign; |
985b6196 RS |
2973 | } |
2974 | mnzer2: | |
2975 | ||
2976 | /* Multiply significands */ | |
2977 | j = emulm (ai, bi); | |
2978 | /* calculate exponent */ | |
2979 | lt = lta + ltb - (EXONE - 1); | |
2980 | emdnorm (bi, j, 0, lt, 64); | |
985b6196 | 2981 | emovo (bi, c); |
d56390c4 RK |
2982 | |
2983 | mulsign: | |
2984 | ||
2985 | if (sign | |
2986 | #ifndef IEEE | |
2987 | && (ecmp (c, ezero) != 0) | |
2988 | #endif | |
2989 | ) | |
2990 | *(c+(NE-1)) |= 0x8000; | |
2991 | else | |
2992 | *(c+(NE-1)) &= ~0x8000; | |
985b6196 RS |
2993 | } |
2994 | ||
8c35bbc5 | 2995 | /* Convert double precision PE to e-type Y. */ |
a0353055 RK |
2996 | |
2997 | static void | |
66b6d60b RS |
2998 | e53toe (pe, y) |
2999 | unsigned EMUSHORT *pe, *y; | |
985b6196 RS |
3000 | { |
3001 | #ifdef DEC | |
3002 | ||
8c35bbc5 | 3003 | dectoe (pe, y); |
985b6196 RS |
3004 | |
3005 | #else | |
842fbaaa JW |
3006 | #ifdef IBM |
3007 | ||
3008 | ibmtoe (pe, y, DFmode); | |
985b6196 | 3009 | |
f5963e61 JL |
3010 | #else |
3011 | #ifdef C4X | |
3012 | ||
3013 | c4xtoe (pe, y, HFmode); | |
3014 | ||
842fbaaa | 3015 | #else |
985b6196 | 3016 | register unsigned EMUSHORT r; |
66b6d60b | 3017 | register unsigned EMUSHORT *e, *p; |
985b6196 RS |
3018 | unsigned EMUSHORT yy[NI]; |
3019 | int denorm, k; | |
3020 | ||
66b6d60b | 3021 | e = pe; |
985b6196 RS |
3022 | denorm = 0; /* flag if denormalized number */ |
3023 | ecleaz (yy); | |
8c35bbc5 | 3024 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 3025 | e += 3; |
985b6196 RS |
3026 | r = *e; |
3027 | yy[0] = 0; | |
3028 | if (r & 0x8000) | |
3029 | yy[0] = 0xffff; | |
3030 | yy[M] = (r & 0x0f) | 0x10; | |
3031 | r &= ~0x800f; /* strip sign and 4 significand bits */ | |
3032 | #ifdef INFINITY | |
3033 | if (r == 0x7ff0) | |
3034 | { | |
66b6d60b | 3035 | #ifdef NANS |
8c35bbc5 | 3036 | if (! REAL_WORDS_BIG_ENDIAN) |
66b6d60b | 3037 | { |
f76b9db2 ILT |
3038 | if (((pe[3] & 0xf) != 0) || (pe[2] != 0) |
3039 | || (pe[1] != 0) || (pe[0] != 0)) | |
3040 | { | |
3041 | enan (y, yy[0] != 0); | |
3042 | return; | |
3043 | } | |
66b6d60b | 3044 | } |
f76b9db2 | 3045 | else |
66b6d60b | 3046 | { |
f76b9db2 ILT |
3047 | if (((pe[0] & 0xf) != 0) || (pe[1] != 0) |
3048 | || (pe[2] != 0) || (pe[3] != 0)) | |
3049 | { | |
3050 | enan (y, yy[0] != 0); | |
3051 | return; | |
3052 | } | |
66b6d60b | 3053 | } |
66b6d60b | 3054 | #endif /* NANS */ |
dca821e1 | 3055 | eclear (y); |
985b6196 | 3056 | einfin (y); |
dca821e1 | 3057 | if (yy[0]) |
985b6196 RS |
3058 | eneg (y); |
3059 | return; | |
3060 | } | |
66b6d60b | 3061 | #endif /* INFINITY */ |
985b6196 RS |
3062 | r >>= 4; |
3063 | /* If zero exponent, then the significand is denormalized. | |
0f41302f | 3064 | So take back the understood high significand bit. */ |
defb5dab | 3065 | |
985b6196 RS |
3066 | if (r == 0) |
3067 | { | |
3068 | denorm = 1; | |
3069 | yy[M] &= ~0x10; | |
3070 | } | |
3071 | r += EXONE - 01777; | |
3072 | yy[E] = r; | |
3073 | p = &yy[M + 1]; | |
f76b9db2 | 3074 | #ifdef IEEE |
8c35bbc5 | 3075 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3076 | { |
3077 | *p++ = *(--e); | |
3078 | *p++ = *(--e); | |
3079 | *p++ = *(--e); | |
3080 | } | |
3081 | else | |
3082 | { | |
3083 | ++e; | |
3084 | *p++ = *e++; | |
3085 | *p++ = *e++; | |
3086 | *p++ = *e++; | |
3087 | } | |
985b6196 | 3088 | #endif |
64685ffa | 3089 | eshift (yy, -5); |
985b6196 | 3090 | if (denorm) |
f5963e61 JL |
3091 | { |
3092 | /* If zero exponent, then normalize the significand. */ | |
985b6196 RS |
3093 | if ((k = enormlz (yy)) > NBITS) |
3094 | ecleazs (yy); | |
3095 | else | |
3096 | yy[E] -= (unsigned EMUSHORT) (k - 1); | |
3097 | } | |
3098 | emovo (yy, y); | |
f5963e61 | 3099 | #endif /* not C4X */ |
842fbaaa | 3100 | #endif /* not IBM */ |
985b6196 RS |
3101 | #endif /* not DEC */ |
3102 | } | |
3103 | ||
8c35bbc5 RK |
3104 | /* Convert double extended precision float PE to e type Y. */ |
3105 | ||
a0353055 | 3106 | static void |
66b6d60b RS |
3107 | e64toe (pe, y) |
3108 | unsigned EMUSHORT *pe, *y; | |
985b6196 RS |
3109 | { |
3110 | unsigned EMUSHORT yy[NI]; | |
66b6d60b | 3111 | unsigned EMUSHORT *e, *p, *q; |
985b6196 RS |
3112 | int i; |
3113 | ||
66b6d60b | 3114 | e = pe; |
985b6196 RS |
3115 | p = yy; |
3116 | for (i = 0; i < NE - 5; i++) | |
3117 | *p++ = 0; | |
0f41302f | 3118 | /* This precision is not ordinarily supported on DEC or IBM. */ |
985b6196 RS |
3119 | #ifdef DEC |
3120 | for (i = 0; i < 5; i++) | |
3121 | *p++ = *e++; | |
3122 | #endif | |
842fbaaa JW |
3123 | #ifdef IBM |
3124 | p = &yy[0] + (NE - 1); | |
3125 | *p-- = *e++; | |
3126 | ++e; | |
3127 | for (i = 0; i < 5; i++) | |
3128 | *p-- = *e++; | |
3129 | #endif | |
f76b9db2 | 3130 | #ifdef IEEE |
8c35bbc5 | 3131 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3132 | { |
3133 | for (i = 0; i < 5; i++) | |
3134 | *p++ = *e++; | |
d730ef29 RK |
3135 | |
3136 | /* For denormal long double Intel format, shift significand up one | |
3137 | -- but only if the top significand bit is zero. A top bit of 1 | |
3138 | is "pseudodenormal" when the exponent is zero. */ | |
3139 | if((yy[NE-1] & 0x7fff) == 0 && (yy[NE-2] & 0x8000) == 0) | |
3140 | { | |
3141 | unsigned EMUSHORT temp[NI]; | |
3142 | ||
3143 | emovi(yy, temp); | |
3144 | eshup1(temp); | |
3145 | emovo(temp,y); | |
3146 | return; | |
3147 | } | |
f76b9db2 ILT |
3148 | } |
3149 | else | |
3150 | { | |
3151 | p = &yy[0] + (NE - 1); | |
f250a0bc RK |
3152 | #ifdef ARM_EXTENDED_IEEE_FORMAT |
3153 | /* For ARMs, the exponent is in the lowest 15 bits of the word. */ | |
3154 | *p-- = (e[0] & 0x8000) | (e[1] & 0x7ffff); | |
3155 | e += 2; | |
3156 | #else | |
f76b9db2 ILT |
3157 | *p-- = *e++; |
3158 | ++e; | |
f250a0bc | 3159 | #endif |
f76b9db2 ILT |
3160 | for (i = 0; i < 4; i++) |
3161 | *p-- = *e++; | |
3162 | } | |
985b6196 | 3163 | #endif |
985b6196 | 3164 | #ifdef INFINITY |
82e974d4 RK |
3165 | /* Point to the exponent field and check max exponent cases. */ |
3166 | p = &yy[NE - 1]; | |
f250a0bc | 3167 | if ((*p & 0x7fff) == 0x7fff) |
985b6196 | 3168 | { |
66b6d60b | 3169 | #ifdef NANS |
8c35bbc5 | 3170 | if (! REAL_WORDS_BIG_ENDIAN) |
66b6d60b | 3171 | { |
f76b9db2 | 3172 | for (i = 0; i < 4; i++) |
66b6d60b | 3173 | { |
82e974d4 RK |
3174 | if ((i != 3 && pe[i] != 0) |
3175 | /* Anything but 0x8000 here, including 0, is a NaN. */ | |
3176 | || (i == 3 && pe[i] != 0x8000)) | |
f76b9db2 ILT |
3177 | { |
3178 | enan (y, (*p & 0x8000) != 0); | |
3179 | return; | |
3180 | } | |
66b6d60b RS |
3181 | } |
3182 | } | |
f76b9db2 | 3183 | else |
66b6d60b | 3184 | { |
f250a0bc RK |
3185 | #ifdef ARM_EXTENDED_IEEE_FORMAT |
3186 | for (i = 2; i <= 5; i++) | |
66b6d60b | 3187 | { |
f76b9db2 ILT |
3188 | if (pe[i] != 0) |
3189 | { | |
3190 | enan (y, (*p & 0x8000) != 0); | |
3191 | return; | |
3192 | } | |
66b6d60b | 3193 | } |
f250a0bc RK |
3194 | #else /* not ARM */ |
3195 | /* In Motorola extended precision format, the most significant | |
3196 | bit of an infinity mantissa could be either 1 or 0. It is | |
3197 | the lower order bits that tell whether the value is a NaN. */ | |
3198 | if ((pe[2] & 0x7fff) != 0) | |
3199 | goto bigend_nan; | |
3200 | ||
3201 | for (i = 3; i <= 5; i++) | |
3202 | { | |
3203 | if (pe[i] != 0) | |
3204 | { | |
3205 | bigend_nan: | |
3206 | enan (y, (*p & 0x8000) != 0); | |
3207 | return; | |
3208 | } | |
3209 | } | |
3210 | #endif /* not ARM */ | |
66b6d60b | 3211 | } |
66b6d60b | 3212 | #endif /* NANS */ |
dca821e1 | 3213 | eclear (y); |
985b6196 RS |
3214 | einfin (y); |
3215 | if (*p & 0x8000) | |
3216 | eneg (y); | |
3217 | return; | |
3218 | } | |
66b6d60b | 3219 | #endif /* INFINITY */ |
82e974d4 RK |
3220 | p = yy; |
3221 | q = y; | |
985b6196 RS |
3222 | for (i = 0; i < NE; i++) |
3223 | *q++ = *p++; | |
3224 | } | |
3225 | ||
8c35bbc5 | 3226 | /* Convert 128-bit long double precision float PE to e type Y. */ |
985b6196 | 3227 | |
a0353055 | 3228 | static void |
842fbaaa | 3229 | e113toe (pe, y) |
66b6d60b | 3230 | unsigned EMUSHORT *pe, *y; |
985b6196 RS |
3231 | { |
3232 | register unsigned EMUSHORT r; | |
842fbaaa | 3233 | unsigned EMUSHORT *e, *p; |
985b6196 | 3234 | unsigned EMUSHORT yy[NI]; |
842fbaaa | 3235 | int denorm, i; |
985b6196 | 3236 | |
66b6d60b | 3237 | e = pe; |
842fbaaa | 3238 | denorm = 0; |
985b6196 | 3239 | ecleaz (yy); |
f76b9db2 | 3240 | #ifdef IEEE |
8c35bbc5 | 3241 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 3242 | e += 7; |
985b6196 RS |
3243 | #endif |
3244 | r = *e; | |
3245 | yy[0] = 0; | |
3246 | if (r & 0x8000) | |
3247 | yy[0] = 0xffff; | |
842fbaaa | 3248 | r &= 0x7fff; |
985b6196 | 3249 | #ifdef INFINITY |
842fbaaa | 3250 | if (r == 0x7fff) |
985b6196 | 3251 | { |
66b6d60b | 3252 | #ifdef NANS |
8c35bbc5 | 3253 | if (! REAL_WORDS_BIG_ENDIAN) |
66b6d60b | 3254 | { |
f76b9db2 | 3255 | for (i = 0; i < 7; i++) |
842fbaaa | 3256 | { |
f76b9db2 ILT |
3257 | if (pe[i] != 0) |
3258 | { | |
3259 | enan (y, yy[0] != 0); | |
3260 | return; | |
3261 | } | |
842fbaaa | 3262 | } |
66b6d60b | 3263 | } |
f76b9db2 | 3264 | else |
66b6d60b | 3265 | { |
f76b9db2 | 3266 | for (i = 1; i < 8; i++) |
842fbaaa | 3267 | { |
f76b9db2 ILT |
3268 | if (pe[i] != 0) |
3269 | { | |
3270 | enan (y, yy[0] != 0); | |
3271 | return; | |
3272 | } | |
842fbaaa | 3273 | } |
66b6d60b | 3274 | } |
842fbaaa | 3275 | #endif /* NANS */ |
dca821e1 | 3276 | eclear (y); |
985b6196 | 3277 | einfin (y); |
dca821e1 | 3278 | if (yy[0]) |
985b6196 RS |
3279 | eneg (y); |
3280 | return; | |
3281 | } | |
66b6d60b | 3282 | #endif /* INFINITY */ |
985b6196 RS |
3283 | yy[E] = r; |
3284 | p = &yy[M + 1]; | |
f76b9db2 | 3285 | #ifdef IEEE |
8c35bbc5 | 3286 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3287 | { |
3288 | for (i = 0; i < 7; i++) | |
3289 | *p++ = *(--e); | |
3290 | } | |
3291 | else | |
3292 | { | |
3293 | ++e; | |
3294 | for (i = 0; i < 7; i++) | |
3295 | *p++ = *e++; | |
3296 | } | |
985b6196 | 3297 | #endif |
0f41302f | 3298 | /* If denormal, remove the implied bit; else shift down 1. */ |
842fbaaa JW |
3299 | if (r == 0) |
3300 | { | |
3301 | yy[M] = 0; | |
3302 | } | |
3303 | else | |
3304 | { | |
3305 | yy[M] = 1; | |
3306 | eshift (yy, -1); | |
3307 | } | |
3308 | emovo (yy, y); | |
3309 | } | |
3310 | ||
8c35bbc5 | 3311 | /* Convert single precision float PE to e type Y. */ |
a0353055 RK |
3312 | |
3313 | static void | |
842fbaaa JW |
3314 | e24toe (pe, y) |
3315 | unsigned EMUSHORT *pe, *y; | |
3316 | { | |
3317 | #ifdef IBM | |
3318 | ||
3319 | ibmtoe (pe, y, SFmode); | |
3320 | ||
3321 | #else | |
f5963e61 JL |
3322 | |
3323 | #ifdef C4X | |
3324 | ||
3325 | c4xtoe (pe, y, QFmode); | |
3326 | ||
3327 | #else | |
3328 | ||
842fbaaa JW |
3329 | register unsigned EMUSHORT r; |
3330 | register unsigned EMUSHORT *e, *p; | |
3331 | unsigned EMUSHORT yy[NI]; | |
3332 | int denorm, k; | |
3333 | ||
3334 | e = pe; | |
3335 | denorm = 0; /* flag if denormalized number */ | |
3336 | ecleaz (yy); | |
f76b9db2 | 3337 | #ifdef IEEE |
8c35bbc5 | 3338 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 3339 | e += 1; |
842fbaaa JW |
3340 | #endif |
3341 | #ifdef DEC | |
3342 | e += 1; | |
3343 | #endif | |
3344 | r = *e; | |
3345 | yy[0] = 0; | |
3346 | if (r & 0x8000) | |
3347 | yy[0] = 0xffff; | |
3348 | yy[M] = (r & 0x7f) | 0200; | |
3349 | r &= ~0x807f; /* strip sign and 7 significand bits */ | |
3350 | #ifdef INFINITY | |
3351 | if (r == 0x7f80) | |
3352 | { | |
3353 | #ifdef NANS | |
8c35bbc5 | 3354 | if (REAL_WORDS_BIG_ENDIAN) |
842fbaaa | 3355 | { |
f76b9db2 ILT |
3356 | if (((pe[0] & 0x7f) != 0) || (pe[1] != 0)) |
3357 | { | |
3358 | enan (y, yy[0] != 0); | |
3359 | return; | |
3360 | } | |
842fbaaa | 3361 | } |
f76b9db2 | 3362 | else |
842fbaaa | 3363 | { |
f76b9db2 ILT |
3364 | if (((pe[1] & 0x7f) != 0) || (pe[0] != 0)) |
3365 | { | |
3366 | enan (y, yy[0] != 0); | |
3367 | return; | |
3368 | } | |
842fbaaa | 3369 | } |
842fbaaa JW |
3370 | #endif /* NANS */ |
3371 | eclear (y); | |
3372 | einfin (y); | |
3373 | if (yy[0]) | |
3374 | eneg (y); | |
3375 | return; | |
3376 | } | |
3377 | #endif /* INFINITY */ | |
3378 | r >>= 7; | |
3379 | /* If zero exponent, then the significand is denormalized. | |
0f41302f | 3380 | So take back the understood high significand bit. */ |
842fbaaa JW |
3381 | if (r == 0) |
3382 | { | |
3383 | denorm = 1; | |
3384 | yy[M] &= ~0200; | |
3385 | } | |
3386 | r += EXONE - 0177; | |
3387 | yy[E] = r; | |
3388 | p = &yy[M + 1]; | |
842fbaaa JW |
3389 | #ifdef DEC |
3390 | *p++ = *(--e); | |
3391 | #endif | |
f76b9db2 | 3392 | #ifdef IEEE |
8c35bbc5 | 3393 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3394 | *p++ = *(--e); |
3395 | else | |
3396 | { | |
3397 | ++e; | |
3398 | *p++ = *e++; | |
3399 | } | |
842fbaaa JW |
3400 | #endif |
3401 | eshift (yy, -8); | |
3402 | if (denorm) | |
3403 | { /* if zero exponent, then normalize the significand */ | |
3404 | if ((k = enormlz (yy)) > NBITS) | |
3405 | ecleazs (yy); | |
3406 | else | |
3407 | yy[E] -= (unsigned EMUSHORT) (k - 1); | |
985b6196 RS |
3408 | } |
3409 | emovo (yy, y); | |
f5963e61 | 3410 | #endif /* not C4X */ |
842fbaaa JW |
3411 | #endif /* not IBM */ |
3412 | } | |
3413 | ||
8c35bbc5 | 3414 | /* Convert e-type X to IEEE 128-bit long double format E. */ |
842fbaaa | 3415 | |
a0353055 | 3416 | static void |
842fbaaa JW |
3417 | etoe113 (x, e) |
3418 | unsigned EMUSHORT *x, *e; | |
3419 | { | |
3420 | unsigned EMUSHORT xi[NI]; | |
3421 | EMULONG exp; | |
3422 | int rndsav; | |
3423 | ||
3424 | #ifdef NANS | |
3425 | if (eisnan (x)) | |
3426 | { | |
29e11dab | 3427 | make_nan (e, eisneg (x), TFmode); |
842fbaaa JW |
3428 | return; |
3429 | } | |
3430 | #endif | |
3431 | emovi (x, xi); | |
3432 | exp = (EMULONG) xi[E]; | |
3433 | #ifdef INFINITY | |
3434 | if (eisinf (x)) | |
3435 | goto nonorm; | |
3436 | #endif | |
3437 | /* round off to nearest or even */ | |
3438 | rndsav = rndprc; | |
3439 | rndprc = 113; | |
3440 | emdnorm (xi, 0, 0, exp, 64); | |
3441 | rndprc = rndsav; | |
3442 | nonorm: | |
3443 | toe113 (xi, e); | |
985b6196 RS |
3444 | } |
3445 | ||
8c35bbc5 RK |
3446 | /* Convert exploded e-type X, that has already been rounded to |
3447 | 113-bit precision, to IEEE 128-bit long double format Y. */ | |
a0353055 | 3448 | |
842fbaaa JW |
3449 | static void |
3450 | toe113 (a, b) | |
3451 | unsigned EMUSHORT *a, *b; | |
3452 | { | |
3453 | register unsigned EMUSHORT *p, *q; | |
3454 | unsigned EMUSHORT i; | |
3455 | ||
3456 | #ifdef NANS | |
3457 | if (eiisnan (a)) | |
3458 | { | |
29e11dab | 3459 | make_nan (b, eiisneg (a), TFmode); |
842fbaaa JW |
3460 | return; |
3461 | } | |
3462 | #endif | |
3463 | p = a; | |
8c35bbc5 | 3464 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3465 | q = b; |
3466 | else | |
3467 | q = b + 7; /* point to output exponent */ | |
842fbaaa | 3468 | |
0f41302f | 3469 | /* If not denormal, delete the implied bit. */ |
842fbaaa JW |
3470 | if (a[E] != 0) |
3471 | { | |
3472 | eshup1 (a); | |
3473 | } | |
3474 | /* combine sign and exponent */ | |
3475 | i = *p++; | |
8c35bbc5 | 3476 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3477 | { |
3478 | if (i) | |
3479 | *q++ = *p++ | 0x8000; | |
3480 | else | |
3481 | *q++ = *p++; | |
3482 | } | |
842fbaaa | 3483 | else |
f76b9db2 ILT |
3484 | { |
3485 | if (i) | |
3486 | *q-- = *p++ | 0x8000; | |
3487 | else | |
3488 | *q-- = *p++; | |
3489 | } | |
842fbaaa JW |
3490 | /* skip over guard word */ |
3491 | ++p; | |
3492 | /* move the significand */ | |
8c35bbc5 | 3493 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3494 | { |
3495 | for (i = 0; i < 7; i++) | |
3496 | *q++ = *p++; | |
3497 | } | |
3498 | else | |
3499 | { | |
3500 | for (i = 0; i < 7; i++) | |
3501 | *q-- = *p++; | |
3502 | } | |
842fbaaa | 3503 | } |
985b6196 | 3504 | |
8c35bbc5 RK |
3505 | /* Convert e-type X to IEEE double extended format E. */ |
3506 | ||
a0353055 | 3507 | static void |
985b6196 RS |
3508 | etoe64 (x, e) |
3509 | unsigned EMUSHORT *x, *e; | |
3510 | { | |
3511 | unsigned EMUSHORT xi[NI]; | |
3512 | EMULONG exp; | |
3513 | int rndsav; | |
3514 | ||
66b6d60b RS |
3515 | #ifdef NANS |
3516 | if (eisnan (x)) | |
3517 | { | |
29e11dab | 3518 | make_nan (e, eisneg (x), XFmode); |
66b6d60b RS |
3519 | return; |
3520 | } | |
3521 | #endif | |
985b6196 RS |
3522 | emovi (x, xi); |
3523 | /* adjust exponent for offset */ | |
3524 | exp = (EMULONG) xi[E]; | |
3525 | #ifdef INFINITY | |
3526 | if (eisinf (x)) | |
3527 | goto nonorm; | |
3528 | #endif | |
3529 | /* round off to nearest or even */ | |
3530 | rndsav = rndprc; | |
3531 | rndprc = 64; | |
3532 | emdnorm (xi, 0, 0, exp, 64); | |
3533 | rndprc = rndsav; | |
3534 | nonorm: | |
3535 | toe64 (xi, e); | |
3536 | } | |
3537 | ||
8c35bbc5 RK |
3538 | /* Convert exploded e-type X, that has already been rounded to |
3539 | 64-bit precision, to IEEE double extended format Y. */ | |
defb5dab | 3540 | |
985b6196 RS |
3541 | static void |
3542 | toe64 (a, b) | |
3543 | unsigned EMUSHORT *a, *b; | |
3544 | { | |
3545 | register unsigned EMUSHORT *p, *q; | |
3546 | unsigned EMUSHORT i; | |
3547 | ||
66b6d60b RS |
3548 | #ifdef NANS |
3549 | if (eiisnan (a)) | |
3550 | { | |
29e11dab | 3551 | make_nan (b, eiisneg (a), XFmode); |
66b6d60b RS |
3552 | return; |
3553 | } | |
3554 | #endif | |
d730ef29 RK |
3555 | /* Shift denormal long double Intel format significand down one bit. */ |
3556 | if ((a[E] == 0) && ! REAL_WORDS_BIG_ENDIAN) | |
3557 | eshdn1 (a); | |
985b6196 | 3558 | p = a; |
f76b9db2 | 3559 | #ifdef IBM |
985b6196 | 3560 | q = b; |
f76b9db2 ILT |
3561 | #endif |
3562 | #ifdef DEC | |
3563 | q = b + 4; | |
3564 | #endif | |
3565 | #ifdef IEEE | |
8c35bbc5 | 3566 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3567 | q = b; |
3568 | else | |
3569 | { | |
3570 | q = b + 4; /* point to output exponent */ | |
985b6196 | 3571 | #if LONG_DOUBLE_TYPE_SIZE == 96 |
f76b9db2 ILT |
3572 | /* Clear the last two bytes of 12-byte Intel format */ |
3573 | *(q+1) = 0; | |
985b6196 | 3574 | #endif |
f76b9db2 | 3575 | } |
985b6196 RS |
3576 | #endif |
3577 | ||
3578 | /* combine sign and exponent */ | |
3579 | i = *p++; | |
f76b9db2 | 3580 | #ifdef IBM |
985b6196 RS |
3581 | if (i) |
3582 | *q++ = *p++ | 0x8000; | |
3583 | else | |
3584 | *q++ = *p++; | |
3585 | *q++ = 0; | |
f76b9db2 ILT |
3586 | #endif |
3587 | #ifdef DEC | |
985b6196 RS |
3588 | if (i) |
3589 | *q-- = *p++ | 0x8000; | |
3590 | else | |
3591 | *q-- = *p++; | |
f76b9db2 ILT |
3592 | #endif |
3593 | #ifdef IEEE | |
8c35bbc5 | 3594 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 3595 | { |
f250a0bc RK |
3596 | #ifdef ARM_EXTENDED_IEEE_FORMAT |
3597 | /* The exponent is in the lowest 15 bits of the first word. */ | |
3598 | *q++ = i ? 0x8000 : 0; | |
3599 | *q++ = *p++; | |
3600 | #else | |
f76b9db2 ILT |
3601 | if (i) |
3602 | *q++ = *p++ | 0x8000; | |
3603 | else | |
3604 | *q++ = *p++; | |
3605 | *q++ = 0; | |
f250a0bc | 3606 | #endif |
f76b9db2 ILT |
3607 | } |
3608 | else | |
3609 | { | |
3610 | if (i) | |
3611 | *q-- = *p++ | 0x8000; | |
3612 | else | |
3613 | *q-- = *p++; | |
3614 | } | |
985b6196 RS |
3615 | #endif |
3616 | /* skip over guard word */ | |
3617 | ++p; | |
3618 | /* move the significand */ | |
f76b9db2 | 3619 | #ifdef IBM |
985b6196 RS |
3620 | for (i = 0; i < 4; i++) |
3621 | *q++ = *p++; | |
f76b9db2 ILT |
3622 | #endif |
3623 | #ifdef DEC | |
985b6196 RS |
3624 | for (i = 0; i < 4; i++) |
3625 | *q-- = *p++; | |
3626 | #endif | |
f76b9db2 | 3627 | #ifdef IEEE |
8c35bbc5 | 3628 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3629 | { |
3630 | for (i = 0; i < 4; i++) | |
3631 | *q++ = *p++; | |
3632 | } | |
3633 | else | |
3634 | { | |
82e974d4 RK |
3635 | #ifdef INFINITY |
3636 | if (eiisinf (a)) | |
3637 | { | |
3638 | /* Intel long double infinity significand. */ | |
3639 | *q-- = 0x8000; | |
3640 | *q-- = 0; | |
3641 | *q-- = 0; | |
3642 | *q = 0; | |
3643 | return; | |
3644 | } | |
3645 | #endif | |
f76b9db2 ILT |
3646 | for (i = 0; i < 4; i++) |
3647 | *q-- = *p++; | |
3648 | } | |
3649 | #endif | |
985b6196 RS |
3650 | } |
3651 | ||
8c35bbc5 | 3652 | /* e type to double precision. */ |
985b6196 RS |
3653 | |
3654 | #ifdef DEC | |
8c35bbc5 | 3655 | /* Convert e-type X to DEC-format double E. */ |
985b6196 | 3656 | |
a0353055 | 3657 | static void |
985b6196 RS |
3658 | etoe53 (x, e) |
3659 | unsigned EMUSHORT *x, *e; | |
3660 | { | |
3661 | etodec (x, e); /* see etodec.c */ | |
3662 | } | |
3663 | ||
8c35bbc5 RK |
3664 | /* Convert exploded e-type X, that has already been rounded to |
3665 | 56-bit double precision, to DEC double Y. */ | |
3666 | ||
985b6196 RS |
3667 | static void |
3668 | toe53 (x, y) | |
3669 | unsigned EMUSHORT *x, *y; | |
3670 | { | |
3671 | todec (x, y); | |
3672 | } | |
3673 | ||
3674 | #else | |
842fbaaa | 3675 | #ifdef IBM |
8c35bbc5 | 3676 | /* Convert e-type X to IBM 370-format double E. */ |
842fbaaa | 3677 | |
008f0d36 | 3678 | static void |
842fbaaa JW |
3679 | etoe53 (x, e) |
3680 | unsigned EMUSHORT *x, *e; | |
3681 | { | |
3682 | etoibm (x, e, DFmode); | |
3683 | } | |
3684 | ||
8c35bbc5 RK |
3685 | /* Convert exploded e-type X, that has already been rounded to |
3686 | 56-bit precision, to IBM 370 double Y. */ | |
3687 | ||
842fbaaa JW |
3688 | static void |
3689 | toe53 (x, y) | |
3690 | unsigned EMUSHORT *x, *y; | |
3691 | { | |
3692 | toibm (x, y, DFmode); | |
3693 | } | |
3694 | ||
f5963e61 JL |
3695 | #else /* it's neither DEC nor IBM */ |
3696 | #ifdef C4X | |
3697 | /* Convert e-type X to C4X-format double E. */ | |
3698 | ||
3699 | static void | |
3700 | etoe53 (x, e) | |
3701 | unsigned EMUSHORT *x, *e; | |
3702 | { | |
3703 | etoc4x (x, e, HFmode); | |
3704 | } | |
3705 | ||
3706 | /* Convert exploded e-type X, that has already been rounded to | |
3707 | 56-bit precision, to IBM 370 double Y. */ | |
3708 | ||
3709 | static void | |
3710 | toe53 (x, y) | |
3711 | unsigned EMUSHORT *x, *y; | |
3712 | { | |
3713 | toc4x (x, y, HFmode); | |
3714 | } | |
3715 | ||
3716 | #else /* it's neither DEC nor IBM nor C4X */ | |
985b6196 | 3717 | |
8c35bbc5 RK |
3718 | /* Convert e-type X to IEEE double E. */ |
3719 | ||
008f0d36 | 3720 | static void |
985b6196 RS |
3721 | etoe53 (x, e) |
3722 | unsigned EMUSHORT *x, *e; | |
3723 | { | |
3724 | unsigned EMUSHORT xi[NI]; | |
3725 | EMULONG exp; | |
3726 | int rndsav; | |
3727 | ||
66b6d60b RS |
3728 | #ifdef NANS |
3729 | if (eisnan (x)) | |
3730 | { | |
29e11dab | 3731 | make_nan (e, eisneg (x), DFmode); |
66b6d60b RS |
3732 | return; |
3733 | } | |
3734 | #endif | |
985b6196 RS |
3735 | emovi (x, xi); |
3736 | /* adjust exponent for offsets */ | |
3737 | exp = (EMULONG) xi[E] - (EXONE - 0x3ff); | |
3738 | #ifdef INFINITY | |
3739 | if (eisinf (x)) | |
3740 | goto nonorm; | |
3741 | #endif | |
3742 | /* round off to nearest or even */ | |
3743 | rndsav = rndprc; | |
3744 | rndprc = 53; | |
3745 | emdnorm (xi, 0, 0, exp, 64); | |
3746 | rndprc = rndsav; | |
3747 | nonorm: | |
3748 | toe53 (xi, e); | |
3749 | } | |
3750 | ||
8c35bbc5 RK |
3751 | /* Convert exploded e-type X, that has already been rounded to |
3752 | 53-bit precision, to IEEE double Y. */ | |
985b6196 RS |
3753 | |
3754 | static void | |
3755 | toe53 (x, y) | |
3756 | unsigned EMUSHORT *x, *y; | |
3757 | { | |
3758 | unsigned EMUSHORT i; | |
3759 | unsigned EMUSHORT *p; | |
3760 | ||
66b6d60b RS |
3761 | #ifdef NANS |
3762 | if (eiisnan (x)) | |
3763 | { | |
29e11dab | 3764 | make_nan (y, eiisneg (x), DFmode); |
66b6d60b RS |
3765 | return; |
3766 | } | |
3767 | #endif | |
985b6196 | 3768 | p = &x[0]; |
f76b9db2 | 3769 | #ifdef IEEE |
8c35bbc5 | 3770 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 3771 | y += 3; |
985b6196 RS |
3772 | #endif |
3773 | *y = 0; /* output high order */ | |
3774 | if (*p++) | |
3775 | *y = 0x8000; /* output sign bit */ | |
3776 | ||
3777 | i = *p++; | |
3778 | if (i >= (unsigned int) 2047) | |
0f41302f MS |
3779 | { |
3780 | /* Saturate at largest number less than infinity. */ | |
985b6196 RS |
3781 | #ifdef INFINITY |
3782 | *y |= 0x7ff0; | |
8c35bbc5 | 3783 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3784 | { |
3785 | *(--y) = 0; | |
3786 | *(--y) = 0; | |
3787 | *(--y) = 0; | |
3788 | } | |
3789 | else | |
3790 | { | |
3791 | ++y; | |
3792 | *y++ = 0; | |
3793 | *y++ = 0; | |
3794 | *y++ = 0; | |
3795 | } | |
985b6196 RS |
3796 | #else |
3797 | *y |= (unsigned EMUSHORT) 0x7fef; | |
8c35bbc5 | 3798 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3799 | { |
3800 | *(--y) = 0xffff; | |
3801 | *(--y) = 0xffff; | |
3802 | *(--y) = 0xffff; | |
3803 | } | |
3804 | else | |
3805 | { | |
3806 | ++y; | |
3807 | *y++ = 0xffff; | |
3808 | *y++ = 0xffff; | |
3809 | *y++ = 0xffff; | |
3810 | } | |
985b6196 RS |
3811 | #endif |
3812 | return; | |
3813 | } | |
3814 | if (i == 0) | |
3815 | { | |
64685ffa | 3816 | eshift (x, 4); |
985b6196 RS |
3817 | } |
3818 | else | |
3819 | { | |
3820 | i <<= 4; | |
64685ffa | 3821 | eshift (x, 5); |
985b6196 RS |
3822 | } |
3823 | i |= *p++ & (unsigned EMUSHORT) 0x0f; /* *p = xi[M] */ | |
3824 | *y |= (unsigned EMUSHORT) i; /* high order output already has sign bit set */ | |
8c35bbc5 | 3825 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3826 | { |
3827 | *(--y) = *p++; | |
3828 | *(--y) = *p++; | |
3829 | *(--y) = *p; | |
3830 | } | |
3831 | else | |
3832 | { | |
3833 | ++y; | |
3834 | *y++ = *p++; | |
3835 | *y++ = *p++; | |
3836 | *y++ = *p++; | |
3837 | } | |
985b6196 RS |
3838 | } |
3839 | ||
f5963e61 | 3840 | #endif /* not C4X */ |
842fbaaa | 3841 | #endif /* not IBM */ |
985b6196 RS |
3842 | #endif /* not DEC */ |
3843 | ||
3844 | ||
3845 | ||
8c35bbc5 | 3846 | /* e type to single precision. */ |
defb5dab | 3847 | |
842fbaaa | 3848 | #ifdef IBM |
8c35bbc5 | 3849 | /* Convert e-type X to IBM 370 float E. */ |
842fbaaa | 3850 | |
008f0d36 | 3851 | static void |
842fbaaa JW |
3852 | etoe24 (x, e) |
3853 | unsigned EMUSHORT *x, *e; | |
3854 | { | |
3855 | etoibm (x, e, SFmode); | |
3856 | } | |
3857 | ||
8c35bbc5 RK |
3858 | /* Convert exploded e-type X, that has already been rounded to |
3859 | float precision, to IBM 370 float Y. */ | |
3860 | ||
842fbaaa JW |
3861 | static void |
3862 | toe24 (x, y) | |
3863 | unsigned EMUSHORT *x, *y; | |
3864 | { | |
3865 | toibm (x, y, SFmode); | |
3866 | } | |
3867 | ||
3868 | #else | |
f5963e61 JL |
3869 | |
3870 | #ifdef C4X | |
3871 | /* Convert e-type X to C4X float E. */ | |
3872 | ||
3873 | static void | |
3874 | etoe24 (x, e) | |
3875 | unsigned EMUSHORT *x, *e; | |
3876 | { | |
3877 | etoc4x (x, e, QFmode); | |
3878 | } | |
3879 | ||
3880 | /* Convert exploded e-type X, that has already been rounded to | |
3881 | float precision, to IBM 370 float Y. */ | |
3882 | ||
3883 | static void | |
3884 | toe24 (x, y) | |
3885 | unsigned EMUSHORT *x, *y; | |
3886 | { | |
3887 | toc4x (x, y, QFmode); | |
3888 | } | |
3889 | ||
3890 | #else | |
3891 | ||
8c35bbc5 | 3892 | /* Convert e-type X to IEEE float E. DEC float is the same as IEEE float. */ |
842fbaaa | 3893 | |
008f0d36 | 3894 | static void |
985b6196 RS |
3895 | etoe24 (x, e) |
3896 | unsigned EMUSHORT *x, *e; | |
3897 | { | |
3898 | EMULONG exp; | |
3899 | unsigned EMUSHORT xi[NI]; | |
3900 | int rndsav; | |
3901 | ||
66b6d60b RS |
3902 | #ifdef NANS |
3903 | if (eisnan (x)) | |
3904 | { | |
29e11dab | 3905 | make_nan (e, eisneg (x), SFmode); |
66b6d60b RS |
3906 | return; |
3907 | } | |
3908 | #endif | |
985b6196 RS |
3909 | emovi (x, xi); |
3910 | /* adjust exponent for offsets */ | |
3911 | exp = (EMULONG) xi[E] - (EXONE - 0177); | |
3912 | #ifdef INFINITY | |
3913 | if (eisinf (x)) | |
3914 | goto nonorm; | |
3915 | #endif | |
3916 | /* round off to nearest or even */ | |
3917 | rndsav = rndprc; | |
3918 | rndprc = 24; | |
3919 | emdnorm (xi, 0, 0, exp, 64); | |
3920 | rndprc = rndsav; | |
3921 | nonorm: | |
3922 | toe24 (xi, e); | |
3923 | } | |
3924 | ||
8c35bbc5 RK |
3925 | /* Convert exploded e-type X, that has already been rounded to |
3926 | float precision, to IEEE float Y. */ | |
3927 | ||
985b6196 RS |
3928 | static void |
3929 | toe24 (x, y) | |
3930 | unsigned EMUSHORT *x, *y; | |
3931 | { | |
3932 | unsigned EMUSHORT i; | |
3933 | unsigned EMUSHORT *p; | |
3934 | ||
66b6d60b RS |
3935 | #ifdef NANS |
3936 | if (eiisnan (x)) | |
3937 | { | |
29e11dab | 3938 | make_nan (y, eiisneg (x), SFmode); |
66b6d60b RS |
3939 | return; |
3940 | } | |
3941 | #endif | |
985b6196 | 3942 | p = &x[0]; |
f76b9db2 | 3943 | #ifdef IEEE |
8c35bbc5 | 3944 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 3945 | y += 1; |
985b6196 RS |
3946 | #endif |
3947 | #ifdef DEC | |
3948 | y += 1; | |
3949 | #endif | |
3950 | *y = 0; /* output high order */ | |
3951 | if (*p++) | |
3952 | *y = 0x8000; /* output sign bit */ | |
3953 | ||
3954 | i = *p++; | |
0f41302f | 3955 | /* Handle overflow cases. */ |
985b6196 | 3956 | if (i >= 255) |
64685ffa | 3957 | { |
985b6196 RS |
3958 | #ifdef INFINITY |
3959 | *y |= (unsigned EMUSHORT) 0x7f80; | |
985b6196 RS |
3960 | #ifdef DEC |
3961 | *(--y) = 0; | |
3962 | #endif | |
f76b9db2 | 3963 | #ifdef IEEE |
8c35bbc5 | 3964 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3965 | *(--y) = 0; |
3966 | else | |
3967 | { | |
3968 | ++y; | |
3969 | *y = 0; | |
3970 | } | |
985b6196 | 3971 | #endif |
64685ffa | 3972 | #else /* no INFINITY */ |
985b6196 | 3973 | *y |= (unsigned EMUSHORT) 0x7f7f; |
985b6196 RS |
3974 | #ifdef DEC |
3975 | *(--y) = 0xffff; | |
3976 | #endif | |
f76b9db2 | 3977 | #ifdef IEEE |
8c35bbc5 | 3978 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
3979 | *(--y) = 0xffff; |
3980 | else | |
3981 | { | |
3982 | ++y; | |
3983 | *y = 0xffff; | |
3984 | } | |
985b6196 | 3985 | #endif |
64685ffa RS |
3986 | #ifdef ERANGE |
3987 | errno = ERANGE; | |
985b6196 | 3988 | #endif |
64685ffa | 3989 | #endif /* no INFINITY */ |
985b6196 RS |
3990 | return; |
3991 | } | |
3992 | if (i == 0) | |
3993 | { | |
64685ffa | 3994 | eshift (x, 7); |
985b6196 RS |
3995 | } |
3996 | else | |
3997 | { | |
3998 | i <<= 7; | |
64685ffa | 3999 | eshift (x, 8); |
985b6196 RS |
4000 | } |
4001 | i |= *p++ & (unsigned EMUSHORT) 0x7f; /* *p = xi[M] */ | |
8c35bbc5 RK |
4002 | /* High order output already has sign bit set. */ |
4003 | *y |= i; | |
985b6196 RS |
4004 | #ifdef DEC |
4005 | *(--y) = *p; | |
4006 | #endif | |
f76b9db2 | 4007 | #ifdef IEEE |
8c35bbc5 | 4008 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
4009 | *(--y) = *p; |
4010 | else | |
4011 | { | |
4012 | ++y; | |
4013 | *y = *p; | |
4014 | } | |
985b6196 RS |
4015 | #endif |
4016 | } | |
f5963e61 | 4017 | #endif /* not C4X */ |
842fbaaa | 4018 | #endif /* not IBM */ |
985b6196 | 4019 | |
defb5dab RK |
4020 | /* Compare two e type numbers. |
4021 | Return +1 if a > b | |
4022 | 0 if a == b | |
4023 | -1 if a < b | |
4024 | -2 if either a or b is a NaN. */ | |
a0353055 RK |
4025 | |
4026 | static int | |
985b6196 RS |
4027 | ecmp (a, b) |
4028 | unsigned EMUSHORT *a, *b; | |
4029 | { | |
4030 | unsigned EMUSHORT ai[NI], bi[NI]; | |
4031 | register unsigned EMUSHORT *p, *q; | |
4032 | register int i; | |
4033 | int msign; | |
4034 | ||
66b6d60b RS |
4035 | #ifdef NANS |
4036 | if (eisnan (a) || eisnan (b)) | |
4037 | return (-2); | |
4038 | #endif | |
985b6196 RS |
4039 | emovi (a, ai); |
4040 | p = ai; | |
4041 | emovi (b, bi); | |
4042 | q = bi; | |
4043 | ||
4044 | if (*p != *q) | |
4045 | { /* the signs are different */ | |
4046 | /* -0 equals + 0 */ | |
4047 | for (i = 1; i < NI - 1; i++) | |
4048 | { | |
4049 | if (ai[i] != 0) | |
4050 | goto nzro; | |
4051 | if (bi[i] != 0) | |
4052 | goto nzro; | |
4053 | } | |
4054 | return (0); | |
4055 | nzro: | |
4056 | if (*p == 0) | |
4057 | return (1); | |
4058 | else | |
4059 | return (-1); | |
4060 | } | |
4061 | /* both are the same sign */ | |
4062 | if (*p == 0) | |
4063 | msign = 1; | |
4064 | else | |
4065 | msign = -1; | |
4066 | i = NI - 1; | |
4067 | do | |
4068 | { | |
4069 | if (*p++ != *q++) | |
4070 | { | |
4071 | goto diff; | |
4072 | } | |
4073 | } | |
4074 | while (--i > 0); | |
4075 | ||
4076 | return (0); /* equality */ | |
4077 | ||
985b6196 RS |
4078 | diff: |
4079 | ||
4080 | if (*(--p) > *(--q)) | |
4081 | return (msign); /* p is bigger */ | |
4082 | else | |
4083 | return (-msign); /* p is littler */ | |
4084 | } | |
4085 | ||
8c35bbc5 | 4086 | /* Find e-type nearest integer to X, as floor (X + 0.5). */ |
a0353055 RK |
4087 | |
4088 | static void | |
985b6196 RS |
4089 | eround (x, y) |
4090 | unsigned EMUSHORT *x, *y; | |
4091 | { | |
4092 | eadd (ehalf, x, y); | |
4093 | efloor (y, y); | |
4094 | } | |
4095 | ||
8c35bbc5 | 4096 | /* Convert HOST_WIDE_INT LP to e type Y. */ |
a0353055 RK |
4097 | |
4098 | static void | |
985b6196 | 4099 | ltoe (lp, y) |
b51ab098 RK |
4100 | HOST_WIDE_INT *lp; |
4101 | unsigned EMUSHORT *y; | |
985b6196 RS |
4102 | { |
4103 | unsigned EMUSHORT yi[NI]; | |
b51ab098 | 4104 | unsigned HOST_WIDE_INT ll; |
985b6196 RS |
4105 | int k; |
4106 | ||
4107 | ecleaz (yi); | |
4108 | if (*lp < 0) | |
4109 | { | |
4110 | /* make it positive */ | |
b51ab098 | 4111 | ll = (unsigned HOST_WIDE_INT) (-(*lp)); |
985b6196 RS |
4112 | yi[0] = 0xffff; /* put correct sign in the e type number */ |
4113 | } | |
4114 | else | |
4115 | { | |
b51ab098 | 4116 | ll = (unsigned HOST_WIDE_INT) (*lp); |
985b6196 RS |
4117 | } |
4118 | /* move the long integer to yi significand area */ | |
b51ab098 | 4119 | #if HOST_BITS_PER_WIDE_INT == 64 |
7729f1ca RS |
4120 | yi[M] = (unsigned EMUSHORT) (ll >> 48); |
4121 | yi[M + 1] = (unsigned EMUSHORT) (ll >> 32); | |
4122 | yi[M + 2] = (unsigned EMUSHORT) (ll >> 16); | |
4123 | yi[M + 3] = (unsigned EMUSHORT) ll; | |
4124 | yi[E] = EXONE + 47; /* exponent if normalize shift count were 0 */ | |
4125 | #else | |
985b6196 RS |
4126 | yi[M] = (unsigned EMUSHORT) (ll >> 16); |
4127 | yi[M + 1] = (unsigned EMUSHORT) ll; | |
985b6196 | 4128 | yi[E] = EXONE + 15; /* exponent if normalize shift count were 0 */ |
7729f1ca RS |
4129 | #endif |
4130 | ||
985b6196 RS |
4131 | if ((k = enormlz (yi)) > NBITS)/* normalize the significand */ |
4132 | ecleaz (yi); /* it was zero */ | |
4133 | else | |
4134 | yi[E] -= (unsigned EMUSHORT) k;/* subtract shift count from exponent */ | |
4135 | emovo (yi, y); /* output the answer */ | |
4136 | } | |
4137 | ||
8c35bbc5 | 4138 | /* Convert unsigned HOST_WIDE_INT LP to e type Y. */ |
a0353055 RK |
4139 | |
4140 | static void | |
985b6196 | 4141 | ultoe (lp, y) |
b51ab098 RK |
4142 | unsigned HOST_WIDE_INT *lp; |
4143 | unsigned EMUSHORT *y; | |
985b6196 RS |
4144 | { |
4145 | unsigned EMUSHORT yi[NI]; | |
b51ab098 | 4146 | unsigned HOST_WIDE_INT ll; |
985b6196 RS |
4147 | int k; |
4148 | ||
4149 | ecleaz (yi); | |
4150 | ll = *lp; | |
4151 | ||
4152 | /* move the long integer to ayi significand area */ | |
b51ab098 | 4153 | #if HOST_BITS_PER_WIDE_INT == 64 |
7729f1ca RS |
4154 | yi[M] = (unsigned EMUSHORT) (ll >> 48); |
4155 | yi[M + 1] = (unsigned EMUSHORT) (ll >> 32); | |
4156 | yi[M + 2] = (unsigned EMUSHORT) (ll >> 16); | |
4157 | yi[M + 3] = (unsigned EMUSHORT) ll; | |
4158 | yi[E] = EXONE + 47; /* exponent if normalize shift count were 0 */ | |
4159 | #else | |
985b6196 RS |
4160 | yi[M] = (unsigned EMUSHORT) (ll >> 16); |
4161 | yi[M + 1] = (unsigned EMUSHORT) ll; | |
985b6196 | 4162 | yi[E] = EXONE + 15; /* exponent if normalize shift count were 0 */ |
7729f1ca RS |
4163 | #endif |
4164 | ||
985b6196 RS |
4165 | if ((k = enormlz (yi)) > NBITS)/* normalize the significand */ |
4166 | ecleaz (yi); /* it was zero */ | |
4167 | else | |
4168 | yi[E] -= (unsigned EMUSHORT) k; /* subtract shift count from exponent */ | |
4169 | emovo (yi, y); /* output the answer */ | |
4170 | } | |
4171 | ||
4172 | ||
8c35bbc5 RK |
4173 | /* Find signed HOST_WIDE_INT integer I and floating point fractional |
4174 | part FRAC of e-type (packed internal format) floating point input X. | |
c764eafd RK |
4175 | The integer output I has the sign of the input, except that |
4176 | positive overflow is permitted if FIXUNS_TRUNC_LIKE_FIX_TRUNC. | |
4177 | The output e-type fraction FRAC is the positive fractional | |
4178 | part of abs (X). */ | |
985b6196 | 4179 | |
a0353055 | 4180 | static void |
985b6196 RS |
4181 | eifrac (x, i, frac) |
4182 | unsigned EMUSHORT *x; | |
b51ab098 | 4183 | HOST_WIDE_INT *i; |
985b6196 RS |
4184 | unsigned EMUSHORT *frac; |
4185 | { | |
4186 | unsigned EMUSHORT xi[NI]; | |
7729f1ca | 4187 | int j, k; |
b51ab098 | 4188 | unsigned HOST_WIDE_INT ll; |
985b6196 RS |
4189 | |
4190 | emovi (x, xi); | |
4191 | k = (int) xi[E] - (EXONE - 1); | |
4192 | if (k <= 0) | |
4193 | { | |
4194 | /* if exponent <= 0, integer = 0 and real output is fraction */ | |
4195 | *i = 0L; | |
4196 | emovo (xi, frac); | |
4197 | return; | |
4198 | } | |
b51ab098 | 4199 | if (k > (HOST_BITS_PER_WIDE_INT - 1)) |
985b6196 | 4200 | { |
7729f1ca RS |
4201 | /* long integer overflow: output large integer |
4202 | and correct fraction */ | |
985b6196 | 4203 | if (xi[0]) |
b51ab098 | 4204 | *i = ((unsigned HOST_WIDE_INT) 1) << (HOST_BITS_PER_WIDE_INT - 1); |
985b6196 | 4205 | else |
c764eafd RK |
4206 | { |
4207 | #ifdef FIXUNS_TRUNC_LIKE_FIX_TRUNC | |
4208 | /* In this case, let it overflow and convert as if unsigned. */ | |
4209 | euifrac (x, &ll, frac); | |
4210 | *i = (HOST_WIDE_INT) ll; | |
4211 | return; | |
4212 | #else | |
4213 | /* In other cases, return the largest positive integer. */ | |
4214 | *i = (((unsigned HOST_WIDE_INT) 1) << (HOST_BITS_PER_WIDE_INT - 1)) - 1; | |
4215 | #endif | |
4216 | } | |
64685ffa RS |
4217 | eshift (xi, k); |
4218 | if (extra_warnings) | |
4219 | warning ("overflow on truncation to integer"); | |
985b6196 | 4220 | } |
7729f1ca | 4221 | else if (k > 16) |
985b6196 | 4222 | { |
7729f1ca RS |
4223 | /* Shift more than 16 bits: first shift up k-16 mod 16, |
4224 | then shift up by 16's. */ | |
4225 | j = k - ((k >> 4) << 4); | |
4226 | eshift (xi, j); | |
4227 | ll = xi[M]; | |
4228 | k -= j; | |
4229 | do | |
4230 | { | |
4231 | eshup6 (xi); | |
4232 | ll = (ll << 16) | xi[M]; | |
4233 | } | |
4234 | while ((k -= 16) > 0); | |
4235 | *i = ll; | |
4236 | if (xi[0]) | |
4237 | *i = -(*i); | |
4238 | } | |
4239 | else | |
842fbaaa JW |
4240 | { |
4241 | /* shift not more than 16 bits */ | |
4242 | eshift (xi, k); | |
b51ab098 | 4243 | *i = (HOST_WIDE_INT) xi[M] & 0xffff; |
842fbaaa JW |
4244 | if (xi[0]) |
4245 | *i = -(*i); | |
4246 | } | |
985b6196 RS |
4247 | xi[0] = 0; |
4248 | xi[E] = EXONE - 1; | |
4249 | xi[M] = 0; | |
4250 | if ((k = enormlz (xi)) > NBITS) | |
4251 | ecleaz (xi); | |
4252 | else | |
4253 | xi[E] -= (unsigned EMUSHORT) k; | |
4254 | ||
4255 | emovo (xi, frac); | |
4256 | } | |
4257 | ||
4258 | ||
8c35bbc5 RK |
4259 | /* Find unsigned HOST_WIDE_INT integer I and floating point fractional part |
4260 | FRAC of e-type X. A negative input yields integer output = 0 but | |
4261 | correct fraction. */ | |
985b6196 | 4262 | |
a0353055 | 4263 | static void |
985b6196 RS |
4264 | euifrac (x, i, frac) |
4265 | unsigned EMUSHORT *x; | |
b51ab098 | 4266 | unsigned HOST_WIDE_INT *i; |
985b6196 RS |
4267 | unsigned EMUSHORT *frac; |
4268 | { | |
b51ab098 | 4269 | unsigned HOST_WIDE_INT ll; |
985b6196 | 4270 | unsigned EMUSHORT xi[NI]; |
7729f1ca | 4271 | int j, k; |
985b6196 RS |
4272 | |
4273 | emovi (x, xi); | |
4274 | k = (int) xi[E] - (EXONE - 1); | |
4275 | if (k <= 0) | |
4276 | { | |
4277 | /* if exponent <= 0, integer = 0 and argument is fraction */ | |
4278 | *i = 0L; | |
4279 | emovo (xi, frac); | |
4280 | return; | |
4281 | } | |
b51ab098 | 4282 | if (k > HOST_BITS_PER_WIDE_INT) |
985b6196 | 4283 | { |
7729f1ca RS |
4284 | /* Long integer overflow: output large integer |
4285 | and correct fraction. | |
4286 | Note, the BSD microvax compiler says that ~(0UL) | |
4287 | is a syntax error. */ | |
985b6196 | 4288 | *i = ~(0L); |
64685ffa RS |
4289 | eshift (xi, k); |
4290 | if (extra_warnings) | |
4291 | warning ("overflow on truncation to unsigned integer"); | |
985b6196 | 4292 | } |
7729f1ca | 4293 | else if (k > 16) |
985b6196 | 4294 | { |
7729f1ca RS |
4295 | /* Shift more than 16 bits: first shift up k-16 mod 16, |
4296 | then shift up by 16's. */ | |
4297 | j = k - ((k >> 4) << 4); | |
4298 | eshift (xi, j); | |
4299 | ll = xi[M]; | |
4300 | k -= j; | |
4301 | do | |
4302 | { | |
4303 | eshup6 (xi); | |
4304 | ll = (ll << 16) | xi[M]; | |
4305 | } | |
4306 | while ((k -= 16) > 0); | |
4307 | *i = ll; | |
4308 | } | |
4309 | else | |
4310 | { | |
4311 | /* shift not more than 16 bits */ | |
64685ffa | 4312 | eshift (xi, k); |
b51ab098 | 4313 | *i = (HOST_WIDE_INT) xi[M] & 0xffff; |
985b6196 RS |
4314 | } |
4315 | ||
0f41302f | 4316 | if (xi[0]) /* A negative value yields unsigned integer 0. */ |
985b6196 | 4317 | *i = 0L; |
842fbaaa | 4318 | |
985b6196 RS |
4319 | xi[0] = 0; |
4320 | xi[E] = EXONE - 1; | |
4321 | xi[M] = 0; | |
4322 | if ((k = enormlz (xi)) > NBITS) | |
4323 | ecleaz (xi); | |
4324 | else | |
4325 | xi[E] -= (unsigned EMUSHORT) k; | |
4326 | ||
4327 | emovo (xi, frac); | |
4328 | } | |
4329 | ||
8c35bbc5 | 4330 | /* Shift the significand of exploded e-type X up or down by SC bits. */ |
a0353055 RK |
4331 | |
4332 | static int | |
985b6196 RS |
4333 | eshift (x, sc) |
4334 | unsigned EMUSHORT *x; | |
4335 | int sc; | |
4336 | { | |
4337 | unsigned EMUSHORT lost; | |
4338 | unsigned EMUSHORT *p; | |
4339 | ||
4340 | if (sc == 0) | |
4341 | return (0); | |
4342 | ||
4343 | lost = 0; | |
4344 | p = x + NI - 1; | |
4345 | ||
4346 | if (sc < 0) | |
4347 | { | |
4348 | sc = -sc; | |
4349 | while (sc >= 16) | |
4350 | { | |
4351 | lost |= *p; /* remember lost bits */ | |
4352 | eshdn6 (x); | |
4353 | sc -= 16; | |
4354 | } | |
4355 | ||
4356 | while (sc >= 8) | |
4357 | { | |
4358 | lost |= *p & 0xff; | |
4359 | eshdn8 (x); | |
4360 | sc -= 8; | |
4361 | } | |
4362 | ||
4363 | while (sc > 0) | |
4364 | { | |
4365 | lost |= *p & 1; | |
4366 | eshdn1 (x); | |
4367 | sc -= 1; | |
4368 | } | |
4369 | } | |
4370 | else | |
4371 | { | |
4372 | while (sc >= 16) | |
4373 | { | |
4374 | eshup6 (x); | |
4375 | sc -= 16; | |
4376 | } | |
4377 | ||
4378 | while (sc >= 8) | |
4379 | { | |
4380 | eshup8 (x); | |
4381 | sc -= 8; | |
4382 | } | |
4383 | ||
4384 | while (sc > 0) | |
4385 | { | |
4386 | eshup1 (x); | |
4387 | sc -= 1; | |
4388 | } | |
4389 | } | |
4390 | if (lost) | |
4391 | lost = 1; | |
4392 | return ((int) lost); | |
4393 | } | |
4394 | ||
8c35bbc5 RK |
4395 | /* Shift normalize the significand area of exploded e-type X. |
4396 | Return the shift count (up = positive). */ | |
a0353055 RK |
4397 | |
4398 | static int | |
985b6196 RS |
4399 | enormlz (x) |
4400 | unsigned EMUSHORT x[]; | |
4401 | { | |
4402 | register unsigned EMUSHORT *p; | |
4403 | int sc; | |
4404 | ||
4405 | sc = 0; | |
4406 | p = &x[M]; | |
4407 | if (*p != 0) | |
4408 | goto normdn; | |
4409 | ++p; | |
4410 | if (*p & 0x8000) | |
4411 | return (0); /* already normalized */ | |
4412 | while (*p == 0) | |
4413 | { | |
4414 | eshup6 (x); | |
4415 | sc += 16; | |
defb5dab | 4416 | |
985b6196 | 4417 | /* With guard word, there are NBITS+16 bits available. |
defb5dab | 4418 | Return true if all are zero. */ |
985b6196 RS |
4419 | if (sc > NBITS) |
4420 | return (sc); | |
4421 | } | |
4422 | /* see if high byte is zero */ | |
4423 | while ((*p & 0xff00) == 0) | |
4424 | { | |
4425 | eshup8 (x); | |
4426 | sc += 8; | |
4427 | } | |
4428 | /* now shift 1 bit at a time */ | |
4429 | while ((*p & 0x8000) == 0) | |
4430 | { | |
4431 | eshup1 (x); | |
4432 | sc += 1; | |
4433 | if (sc > NBITS) | |
4434 | { | |
4435 | mtherr ("enormlz", UNDERFLOW); | |
4436 | return (sc); | |
4437 | } | |
4438 | } | |
4439 | return (sc); | |
4440 | ||
4441 | /* Normalize by shifting down out of the high guard word | |
4442 | of the significand */ | |
4443 | normdn: | |
4444 | ||
4445 | if (*p & 0xff00) | |
4446 | { | |
4447 | eshdn8 (x); | |
4448 | sc -= 8; | |
4449 | } | |
4450 | while (*p != 0) | |
4451 | { | |
4452 | eshdn1 (x); | |
4453 | sc -= 1; | |
4454 | ||
4455 | if (sc < -NBITS) | |
4456 | { | |
4457 | mtherr ("enormlz", OVERFLOW); | |
4458 | return (sc); | |
4459 | } | |
4460 | } | |
4461 | return (sc); | |
4462 | } | |
4463 | ||
8c35bbc5 | 4464 | /* Powers of ten used in decimal <-> binary conversions. */ |
985b6196 RS |
4465 | |
4466 | #define NTEN 12 | |
4467 | #define MAXP 4096 | |
4468 | ||
842fbaaa JW |
4469 | #if LONG_DOUBLE_TYPE_SIZE == 128 |
4470 | static unsigned EMUSHORT etens[NTEN + 1][NE] = | |
4471 | { | |
4472 | {0x6576, 0x4a92, 0x804a, 0x153f, | |
4473 | 0xc94c, 0x979a, 0x8a20, 0x5202, 0xc460, 0x7525,}, /* 10**4096 */ | |
4474 | {0x6a32, 0xce52, 0x329a, 0x28ce, | |
4475 | 0xa74d, 0x5de4, 0xc53d, 0x3b5d, 0x9e8b, 0x5a92,}, /* 10**2048 */ | |
4476 | {0x526c, 0x50ce, 0xf18b, 0x3d28, | |
4477 | 0x650d, 0x0c17, 0x8175, 0x7586, 0xc976, 0x4d48,}, | |
4478 | {0x9c66, 0x58f8, 0xbc50, 0x5c54, | |
4479 | 0xcc65, 0x91c6, 0xa60e, 0xa0ae, 0xe319, 0x46a3,}, | |
4480 | {0x851e, 0xeab7, 0x98fe, 0x901b, | |
4481 | 0xddbb, 0xde8d, 0x9df9, 0xebfb, 0xaa7e, 0x4351,}, | |
4482 | {0x0235, 0x0137, 0x36b1, 0x336c, | |
4483 | 0xc66f, 0x8cdf, 0x80e9, 0x47c9, 0x93ba, 0x41a8,}, | |
4484 | {0x50f8, 0x25fb, 0xc76b, 0x6b71, | |
4485 | 0x3cbf, 0xa6d5, 0xffcf, 0x1f49, 0xc278, 0x40d3,}, | |
4486 | {0x0000, 0x0000, 0x0000, 0x0000, | |
4487 | 0xf020, 0xb59d, 0x2b70, 0xada8, 0x9dc5, 0x4069,}, | |
4488 | {0x0000, 0x0000, 0x0000, 0x0000, | |
4489 | 0x0000, 0x0000, 0x0400, 0xc9bf, 0x8e1b, 0x4034,}, | |
4490 | {0x0000, 0x0000, 0x0000, 0x0000, | |
4491 | 0x0000, 0x0000, 0x0000, 0x2000, 0xbebc, 0x4019,}, | |
4492 | {0x0000, 0x0000, 0x0000, 0x0000, | |
4493 | 0x0000, 0x0000, 0x0000, 0x0000, 0x9c40, 0x400c,}, | |
4494 | {0x0000, 0x0000, 0x0000, 0x0000, | |
4495 | 0x0000, 0x0000, 0x0000, 0x0000, 0xc800, 0x4005,}, | |
4496 | {0x0000, 0x0000, 0x0000, 0x0000, | |
4497 | 0x0000, 0x0000, 0x0000, 0x0000, 0xa000, 0x4002,}, /* 10**1 */ | |
4498 | }; | |
4499 | ||
4500 | static unsigned EMUSHORT emtens[NTEN + 1][NE] = | |
4501 | { | |
4502 | {0x2030, 0xcffc, 0xa1c3, 0x8123, | |
4503 | 0x2de3, 0x9fde, 0xd2ce, 0x04c8, 0xa6dd, 0x0ad8,}, /* 10**-4096 */ | |
4504 | {0x8264, 0xd2cb, 0xf2ea, 0x12d4, | |
4505 | 0x4925, 0x2de4, 0x3436, 0x534f, 0xceae, 0x256b,}, /* 10**-2048 */ | |
4506 | {0xf53f, 0xf698, 0x6bd3, 0x0158, | |
4507 | 0x87a6, 0xc0bd, 0xda57, 0x82a5, 0xa2a6, 0x32b5,}, | |
4508 | {0xe731, 0x04d4, 0xe3f2, 0xd332, | |
4509 | 0x7132, 0xd21c, 0xdb23, 0xee32, 0x9049, 0x395a,}, | |
4510 | {0xa23e, 0x5308, 0xfefb, 0x1155, | |
4511 | 0xfa91, 0x1939, 0x637a, 0x4325, 0xc031, 0x3cac,}, | |
4512 | {0xe26d, 0xdbde, 0xd05d, 0xb3f6, | |
4513 | 0xac7c, 0xe4a0, 0x64bc, 0x467c, 0xddd0, 0x3e55,}, | |
4514 | {0x2a20, 0x6224, 0x47b3, 0x98d7, | |
4515 | 0x3f23, 0xe9a5, 0xa539, 0xea27, 0xa87f, 0x3f2a,}, | |
4516 | {0x0b5b, 0x4af2, 0xa581, 0x18ed, | |
4517 | 0x67de, 0x94ba, 0x4539, 0x1ead, 0xcfb1, 0x3f94,}, | |
4518 | {0xbf71, 0xa9b3, 0x7989, 0xbe68, | |
4519 | 0x4c2e, 0xe15b, 0xc44d, 0x94be, 0xe695, 0x3fc9,}, | |
4520 | {0x3d4d, 0x7c3d, 0x36ba, 0x0d2b, | |
4521 | 0xfdc2, 0xcefc, 0x8461, 0x7711, 0xabcc, 0x3fe4,}, | |
4522 | {0xc155, 0xa4a8, 0x404e, 0x6113, | |
4523 | 0xd3c3, 0x652b, 0xe219, 0x1758, 0xd1b7, 0x3ff1,}, | |
4524 | {0xd70a, 0x70a3, 0x0a3d, 0xa3d7, | |
4525 | 0x3d70, 0xd70a, 0x70a3, 0x0a3d, 0xa3d7, 0x3ff8,}, | |
4526 | {0xcccd, 0xcccc, 0xcccc, 0xcccc, | |
4527 | 0xcccc, 0xcccc, 0xcccc, 0xcccc, 0xcccc, 0x3ffb,}, /* 10**-1 */ | |
4528 | }; | |
4529 | #else | |
4530 | /* LONG_DOUBLE_TYPE_SIZE is other than 128 */ | |
985b6196 RS |
4531 | static unsigned EMUSHORT etens[NTEN + 1][NE] = |
4532 | { | |
4533 | {0xc94c, 0x979a, 0x8a20, 0x5202, 0xc460, 0x7525,}, /* 10**4096 */ | |
4534 | {0xa74d, 0x5de4, 0xc53d, 0x3b5d, 0x9e8b, 0x5a92,}, /* 10**2048 */ | |
4535 | {0x650d, 0x0c17, 0x8175, 0x7586, 0xc976, 0x4d48,}, | |
4536 | {0xcc65, 0x91c6, 0xa60e, 0xa0ae, 0xe319, 0x46a3,}, | |
4537 | {0xddbc, 0xde8d, 0x9df9, 0xebfb, 0xaa7e, 0x4351,}, | |
4538 | {0xc66f, 0x8cdf, 0x80e9, 0x47c9, 0x93ba, 0x41a8,}, | |
4539 | {0x3cbf, 0xa6d5, 0xffcf, 0x1f49, 0xc278, 0x40d3,}, | |
4540 | {0xf020, 0xb59d, 0x2b70, 0xada8, 0x9dc5, 0x4069,}, | |
4541 | {0x0000, 0x0000, 0x0400, 0xc9bf, 0x8e1b, 0x4034,}, | |
4542 | {0x0000, 0x0000, 0x0000, 0x2000, 0xbebc, 0x4019,}, | |
4543 | {0x0000, 0x0000, 0x0000, 0x0000, 0x9c40, 0x400c,}, | |
4544 | {0x0000, 0x0000, 0x0000, 0x0000, 0xc800, 0x4005,}, | |
4545 | {0x0000, 0x0000, 0x0000, 0x0000, 0xa000, 0x4002,}, /* 10**1 */ | |
4546 | }; | |
4547 | ||
4548 | static unsigned EMUSHORT emtens[NTEN + 1][NE] = | |
4549 | { | |
4550 | {0x2de4, 0x9fde, 0xd2ce, 0x04c8, 0xa6dd, 0x0ad8,}, /* 10**-4096 */ | |
4551 | {0x4925, 0x2de4, 0x3436, 0x534f, 0xceae, 0x256b,}, /* 10**-2048 */ | |
4552 | {0x87a6, 0xc0bd, 0xda57, 0x82a5, 0xa2a6, 0x32b5,}, | |
4553 | {0x7133, 0xd21c, 0xdb23, 0xee32, 0x9049, 0x395a,}, | |
4554 | {0xfa91, 0x1939, 0x637a, 0x4325, 0xc031, 0x3cac,}, | |
4555 | {0xac7d, 0xe4a0, 0x64bc, 0x467c, 0xddd0, 0x3e55,}, | |
4556 | {0x3f24, 0xe9a5, 0xa539, 0xea27, 0xa87f, 0x3f2a,}, | |
4557 | {0x67de, 0x94ba, 0x4539, 0x1ead, 0xcfb1, 0x3f94,}, | |
4558 | {0x4c2f, 0xe15b, 0xc44d, 0x94be, 0xe695, 0x3fc9,}, | |
4559 | {0xfdc2, 0xcefc, 0x8461, 0x7711, 0xabcc, 0x3fe4,}, | |
4560 | {0xd3c3, 0x652b, 0xe219, 0x1758, 0xd1b7, 0x3ff1,}, | |
4561 | {0x3d71, 0xd70a, 0x70a3, 0x0a3d, 0xa3d7, 0x3ff8,}, | |
4562 | {0xcccd, 0xcccc, 0xcccc, 0xcccc, 0xcccc, 0x3ffb,}, /* 10**-1 */ | |
4563 | }; | |
842fbaaa | 4564 | #endif |
985b6196 | 4565 | |
8c35bbc5 RK |
4566 | /* Convert float value X to ASCII string STRING with NDIG digits after |
4567 | the decimal point. */ | |
4568 | ||
a0353055 | 4569 | static void |
985b6196 RS |
4570 | e24toasc (x, string, ndigs) |
4571 | unsigned EMUSHORT x[]; | |
4572 | char *string; | |
4573 | int ndigs; | |
4574 | { | |
4575 | unsigned EMUSHORT w[NI]; | |
4576 | ||
985b6196 RS |
4577 | e24toe (x, w); |
4578 | etoasc (w, string, ndigs); | |
4579 | } | |
4580 | ||
8c35bbc5 RK |
4581 | /* Convert double value X to ASCII string STRING with NDIG digits after |
4582 | the decimal point. */ | |
985b6196 | 4583 | |
a0353055 | 4584 | static void |
985b6196 RS |
4585 | e53toasc (x, string, ndigs) |
4586 | unsigned EMUSHORT x[]; | |
4587 | char *string; | |
4588 | int ndigs; | |
4589 | { | |
4590 | unsigned EMUSHORT w[NI]; | |
4591 | ||
985b6196 RS |
4592 | e53toe (x, w); |
4593 | etoasc (w, string, ndigs); | |
4594 | } | |
4595 | ||
8c35bbc5 RK |
4596 | /* Convert double extended value X to ASCII string STRING with NDIG digits |
4597 | after the decimal point. */ | |
985b6196 | 4598 | |
a0353055 | 4599 | static void |
985b6196 RS |
4600 | e64toasc (x, string, ndigs) |
4601 | unsigned EMUSHORT x[]; | |
4602 | char *string; | |
4603 | int ndigs; | |
4604 | { | |
4605 | unsigned EMUSHORT w[NI]; | |
4606 | ||
985b6196 RS |
4607 | e64toe (x, w); |
4608 | etoasc (w, string, ndigs); | |
4609 | } | |
4610 | ||
8c35bbc5 RK |
4611 | /* Convert 128-bit long double value X to ASCII string STRING with NDIG digits |
4612 | after the decimal point. */ | |
4613 | ||
a0353055 | 4614 | static void |
842fbaaa JW |
4615 | e113toasc (x, string, ndigs) |
4616 | unsigned EMUSHORT x[]; | |
4617 | char *string; | |
4618 | int ndigs; | |
4619 | { | |
4620 | unsigned EMUSHORT w[NI]; | |
4621 | ||
4622 | e113toe (x, w); | |
4623 | etoasc (w, string, ndigs); | |
4624 | } | |
4625 | ||
8c35bbc5 RK |
4626 | /* Convert e-type X to ASCII string STRING with NDIGS digits after |
4627 | the decimal point. */ | |
985b6196 RS |
4628 | |
4629 | static char wstring[80]; /* working storage for ASCII output */ | |
4630 | ||
a0353055 | 4631 | static void |
985b6196 RS |
4632 | etoasc (x, string, ndigs) |
4633 | unsigned EMUSHORT x[]; | |
4634 | char *string; | |
4635 | int ndigs; | |
4636 | { | |
4637 | EMUSHORT digit; | |
4638 | unsigned EMUSHORT y[NI], t[NI], u[NI], w[NI]; | |
4639 | unsigned EMUSHORT *p, *r, *ten; | |
4640 | unsigned EMUSHORT sign; | |
4641 | int i, j, k, expon, rndsav; | |
4642 | char *s, *ss; | |
4643 | unsigned EMUSHORT m; | |
4644 | ||
66b6d60b RS |
4645 | |
4646 | rndsav = rndprc; | |
985b6196 RS |
4647 | ss = string; |
4648 | s = wstring; | |
66b6d60b RS |
4649 | *ss = '\0'; |
4650 | *s = '\0'; | |
4651 | #ifdef NANS | |
4652 | if (eisnan (x)) | |
4653 | { | |
4654 | sprintf (wstring, " NaN "); | |
4655 | goto bxit; | |
4656 | } | |
4657 | #endif | |
985b6196 RS |
4658 | rndprc = NBITS; /* set to full precision */ |
4659 | emov (x, y); /* retain external format */ | |
4660 | if (y[NE - 1] & 0x8000) | |
4661 | { | |
4662 | sign = 0xffff; | |
4663 | y[NE - 1] &= 0x7fff; | |
4664 | } | |
4665 | else | |
4666 | { | |
4667 | sign = 0; | |
4668 | } | |
4669 | expon = 0; | |
4670 | ten = &etens[NTEN][0]; | |
4671 | emov (eone, t); | |
4672 | /* Test for zero exponent */ | |
4673 | if (y[NE - 1] == 0) | |
4674 | { | |
4675 | for (k = 0; k < NE - 1; k++) | |
4676 | { | |
4677 | if (y[k] != 0) | |
4678 | goto tnzro; /* denormalized number */ | |
4679 | } | |
43b55a67 | 4680 | goto isone; /* valid all zeros */ |
985b6196 RS |
4681 | } |
4682 | tnzro: | |
4683 | ||
0f41302f | 4684 | /* Test for infinity. */ |
985b6196 RS |
4685 | if (y[NE - 1] == 0x7fff) |
4686 | { | |
4687 | if (sign) | |
4688 | sprintf (wstring, " -Infinity "); | |
4689 | else | |
4690 | sprintf (wstring, " Infinity "); | |
4691 | goto bxit; | |
4692 | } | |
4693 | ||
4694 | /* Test for exponent nonzero but significand denormalized. | |
4695 | * This is an error condition. | |
4696 | */ | |
4697 | if ((y[NE - 1] != 0) && ((y[NE - 2] & 0x8000) == 0)) | |
4698 | { | |
4699 | mtherr ("etoasc", DOMAIN); | |
4700 | sprintf (wstring, "NaN"); | |
4701 | goto bxit; | |
4702 | } | |
4703 | ||
4704 | /* Compare to 1.0 */ | |
4705 | i = ecmp (eone, y); | |
4706 | if (i == 0) | |
4707 | goto isone; | |
4708 | ||
66b6d60b RS |
4709 | if (i == -2) |
4710 | abort (); | |
4711 | ||
985b6196 RS |
4712 | if (i < 0) |
4713 | { /* Number is greater than 1 */ | |
0f41302f | 4714 | /* Convert significand to an integer and strip trailing decimal zeros. */ |
985b6196 RS |
4715 | emov (y, u); |
4716 | u[NE - 1] = EXONE + NBITS - 1; | |
4717 | ||
4718 | p = &etens[NTEN - 4][0]; | |
4719 | m = 16; | |
4720 | do | |
4721 | { | |
4722 | ediv (p, u, t); | |
4723 | efloor (t, w); | |
4724 | for (j = 0; j < NE - 1; j++) | |
4725 | { | |
4726 | if (t[j] != w[j]) | |
4727 | goto noint; | |
4728 | } | |
4729 | emov (t, u); | |
4730 | expon += (int) m; | |
4731 | noint: | |
4732 | p += NE; | |
4733 | m >>= 1; | |
4734 | } | |
4735 | while (m != 0); | |
4736 | ||
4737 | /* Rescale from integer significand */ | |
4738 | u[NE - 1] += y[NE - 1] - (unsigned int) (EXONE + NBITS - 1); | |
4739 | emov (u, y); | |
4740 | /* Find power of 10 */ | |
4741 | emov (eone, t); | |
4742 | m = MAXP; | |
4743 | p = &etens[0][0]; | |
0f41302f | 4744 | /* An unordered compare result shouldn't happen here. */ |
985b6196 RS |
4745 | while (ecmp (ten, u) <= 0) |
4746 | { | |
4747 | if (ecmp (p, u) <= 0) | |
4748 | { | |
4749 | ediv (p, u, u); | |
4750 | emul (p, t, t); | |
4751 | expon += (int) m; | |
4752 | } | |
4753 | m >>= 1; | |
4754 | if (m == 0) | |
4755 | break; | |
4756 | p += NE; | |
4757 | } | |
4758 | } | |
4759 | else | |
4760 | { /* Number is less than 1.0 */ | |
0f41302f | 4761 | /* Pad significand with trailing decimal zeros. */ |
985b6196 RS |
4762 | if (y[NE - 1] == 0) |
4763 | { | |
4764 | while ((y[NE - 2] & 0x8000) == 0) | |
4765 | { | |
4766 | emul (ten, y, y); | |
4767 | expon -= 1; | |
4768 | } | |
4769 | } | |
4770 | else | |
4771 | { | |
4772 | emovi (y, w); | |
4773 | for (i = 0; i < NDEC + 1; i++) | |
4774 | { | |
4775 | if ((w[NI - 1] & 0x7) != 0) | |
4776 | break; | |
4777 | /* multiply by 10 */ | |
4778 | emovz (w, u); | |
4779 | eshdn1 (u); | |
4780 | eshdn1 (u); | |
4781 | eaddm (w, u); | |
4782 | u[1] += 3; | |
4783 | while (u[2] != 0) | |
4784 | { | |
4785 | eshdn1 (u); | |
4786 | u[1] += 1; | |
4787 | } | |
4788 | if (u[NI - 1] != 0) | |
4789 | break; | |
4790 | if (eone[NE - 1] <= u[1]) | |
4791 | break; | |
4792 | emovz (u, w); | |
4793 | expon -= 1; | |
4794 | } | |
4795 | emovo (w, y); | |
4796 | } | |
4797 | k = -MAXP; | |
4798 | p = &emtens[0][0]; | |
4799 | r = &etens[0][0]; | |
4800 | emov (y, w); | |
4801 | emov (eone, t); | |
4802 | while (ecmp (eone, w) > 0) | |
4803 | { | |
4804 | if (ecmp (p, w) >= 0) | |
4805 | { | |
4806 | emul (r, w, w); | |
4807 | emul (r, t, t); | |
4808 | expon += k; | |
4809 | } | |
4810 | k /= 2; | |
4811 | if (k == 0) | |
4812 | break; | |
4813 | p += NE; | |
4814 | r += NE; | |
4815 | } | |
4816 | ediv (t, eone, t); | |
4817 | } | |
4818 | isone: | |
0f41302f | 4819 | /* Find the first (leading) digit. */ |
985b6196 RS |
4820 | emovi (t, w); |
4821 | emovz (w, t); | |
4822 | emovi (y, w); | |
4823 | emovz (w, y); | |
4824 | eiremain (t, y); | |
4825 | digit = equot[NI - 1]; | |
4826 | while ((digit == 0) && (ecmp (y, ezero) != 0)) | |
4827 | { | |
4828 | eshup1 (y); | |
4829 | emovz (y, u); | |
4830 | eshup1 (u); | |
4831 | eshup1 (u); | |
4832 | eaddm (u, y); | |
4833 | eiremain (t, y); | |
4834 | digit = equot[NI - 1]; | |
4835 | expon -= 1; | |
4836 | } | |
4837 | s = wstring; | |
4838 | if (sign) | |
4839 | *s++ = '-'; | |
4840 | else | |
4841 | *s++ = ' '; | |
0f41302f | 4842 | /* Examine number of digits requested by caller. */ |
985b6196 RS |
4843 | if (ndigs < 0) |
4844 | ndigs = 0; | |
4845 | if (ndigs > NDEC) | |
4846 | ndigs = NDEC; | |
64685ffa RS |
4847 | if (digit == 10) |
4848 | { | |
4849 | *s++ = '1'; | |
4850 | *s++ = '.'; | |
4851 | if (ndigs > 0) | |
4852 | { | |
4853 | *s++ = '0'; | |
4854 | ndigs -= 1; | |
4855 | } | |
4856 | expon += 1; | |
4857 | } | |
4858 | else | |
4859 | { | |
242cef1e | 4860 | *s++ = (char)digit + '0'; |
64685ffa RS |
4861 | *s++ = '.'; |
4862 | } | |
0f41302f | 4863 | /* Generate digits after the decimal point. */ |
985b6196 RS |
4864 | for (k = 0; k <= ndigs; k++) |
4865 | { | |
4866 | /* multiply current number by 10, without normalizing */ | |
4867 | eshup1 (y); | |
4868 | emovz (y, u); | |
4869 | eshup1 (u); | |
4870 | eshup1 (u); | |
4871 | eaddm (u, y); | |
4872 | eiremain (t, y); | |
4873 | *s++ = (char) equot[NI - 1] + '0'; | |
4874 | } | |
4875 | digit = equot[NI - 1]; | |
4876 | --s; | |
4877 | ss = s; | |
4878 | /* round off the ASCII string */ | |
4879 | if (digit > 4) | |
4880 | { | |
0f41302f | 4881 | /* Test for critical rounding case in ASCII output. */ |
985b6196 RS |
4882 | if (digit == 5) |
4883 | { | |
4884 | emovo (y, t); | |
4885 | if (ecmp (t, ezero) != 0) | |
4886 | goto roun; /* round to nearest */ | |
4887 | if ((*(s - 1) & 1) == 0) | |
4888 | goto doexp; /* round to even */ | |
4889 | } | |
4890 | /* Round up and propagate carry-outs */ | |
4891 | roun: | |
4892 | --s; | |
4893 | k = *s & 0x7f; | |
4894 | /* Carry out to most significant digit? */ | |
4895 | if (k == '.') | |
4896 | { | |
4897 | --s; | |
4898 | k = *s; | |
4899 | k += 1; | |
4900 | *s = (char) k; | |
4901 | /* Most significant digit carries to 10? */ | |
4902 | if (k > '9') | |
4903 | { | |
4904 | expon += 1; | |
4905 | *s = '1'; | |
4906 | } | |
4907 | goto doexp; | |
4908 | } | |
4909 | /* Round up and carry out from less significant digits */ | |
4910 | k += 1; | |
4911 | *s = (char) k; | |
4912 | if (k > '9') | |
4913 | { | |
4914 | *s = '0'; | |
4915 | goto roun; | |
4916 | } | |
4917 | } | |
4918 | doexp: | |
4919 | /* | |
4920 | if (expon >= 0) | |
4921 | sprintf (ss, "e+%d", expon); | |
4922 | else | |
4923 | sprintf (ss, "e%d", expon); | |
4924 | */ | |
4925 | sprintf (ss, "e%d", expon); | |
4926 | bxit: | |
4927 | rndprc = rndsav; | |
4928 | /* copy out the working string */ | |
4929 | s = string; | |
4930 | ss = wstring; | |
4931 | while (*ss == ' ') /* strip possible leading space */ | |
4932 | ++ss; | |
4933 | while ((*s++ = *ss++) != '\0') | |
4934 | ; | |
4935 | } | |
4936 | ||
4937 | ||
8c35bbc5 | 4938 | /* Convert ASCII string to floating point. |
985b6196 | 4939 | |
8c35bbc5 RK |
4940 | Numeric input is a free format decimal number of any length, with |
4941 | or without decimal point. Entering E after the number followed by an | |
4942 | integer number causes the second number to be interpreted as a power of | |
4943 | 10 to be multiplied by the first number (i.e., "scientific" notation). */ | |
985b6196 | 4944 | |
8c35bbc5 | 4945 | /* Convert ASCII string S to single precision float value Y. */ |
a0353055 RK |
4946 | |
4947 | static void | |
985b6196 RS |
4948 | asctoe24 (s, y) |
4949 | char *s; | |
4950 | unsigned EMUSHORT *y; | |
4951 | { | |
4952 | asctoeg (s, y, 24); | |
4953 | } | |
4954 | ||
4955 | ||
8c35bbc5 | 4956 | /* Convert ASCII string S to double precision value Y. */ |
a0353055 RK |
4957 | |
4958 | static void | |
985b6196 RS |
4959 | asctoe53 (s, y) |
4960 | char *s; | |
4961 | unsigned EMUSHORT *y; | |
4962 | { | |
842fbaaa | 4963 | #if defined(DEC) || defined(IBM) |
985b6196 | 4964 | asctoeg (s, y, 56); |
f5963e61 JL |
4965 | #else |
4966 | #if defined(C4X) | |
4967 | asctoeg (s, y, 32); | |
985b6196 RS |
4968 | #else |
4969 | asctoeg (s, y, 53); | |
4970 | #endif | |
f5963e61 | 4971 | #endif |
985b6196 RS |
4972 | } |
4973 | ||
4974 | ||
8c35bbc5 | 4975 | /* Convert ASCII string S to double extended value Y. */ |
a0353055 RK |
4976 | |
4977 | static void | |
985b6196 RS |
4978 | asctoe64 (s, y) |
4979 | char *s; | |
4980 | unsigned EMUSHORT *y; | |
4981 | { | |
4982 | asctoeg (s, y, 64); | |
4983 | } | |
4984 | ||
8c35bbc5 | 4985 | /* Convert ASCII string S to 128-bit long double Y. */ |
a0353055 RK |
4986 | |
4987 | static void | |
842fbaaa JW |
4988 | asctoe113 (s, y) |
4989 | char *s; | |
4990 | unsigned EMUSHORT *y; | |
4991 | { | |
4992 | asctoeg (s, y, 113); | |
4993 | } | |
4994 | ||
8c35bbc5 | 4995 | /* Convert ASCII string S to e type Y. */ |
defb5dab | 4996 | |
a0353055 | 4997 | static void |
985b6196 RS |
4998 | asctoe (s, y) |
4999 | char *s; | |
5000 | unsigned EMUSHORT *y; | |
5001 | { | |
5002 | asctoeg (s, y, NBITS); | |
5003 | } | |
5004 | ||
8c35bbc5 | 5005 | /* Convert ASCII string SS to e type Y, with a specified rounding precision |
0f41302f | 5006 | of OPREC bits. */ |
defb5dab | 5007 | |
a0353055 | 5008 | static void |
985b6196 RS |
5009 | asctoeg (ss, y, oprec) |
5010 | char *ss; | |
5011 | unsigned EMUSHORT *y; | |
5012 | int oprec; | |
5013 | { | |
5014 | unsigned EMUSHORT yy[NI], xt[NI], tt[NI]; | |
5015 | int esign, decflg, sgnflg, nexp, exp, prec, lost; | |
5016 | int k, trail, c, rndsav; | |
5017 | EMULONG lexp; | |
5018 | unsigned EMUSHORT nsign, *p; | |
d73e9b8d | 5019 | char *sp, *s, *lstr; |
985b6196 | 5020 | |
0f41302f | 5021 | /* Copy the input string. */ |
d73e9b8d | 5022 | lstr = (char *) alloca (strlen (ss) + 1); |
985b6196 RS |
5023 | s = ss; |
5024 | while (*s == ' ') /* skip leading spaces */ | |
5025 | ++s; | |
5026 | sp = lstr; | |
a9456cd3 RS |
5027 | while ((*sp++ = *s++) != '\0') |
5028 | ; | |
985b6196 RS |
5029 | s = lstr; |
5030 | ||
5031 | rndsav = rndprc; | |
5032 | rndprc = NBITS; /* Set to full precision */ | |
5033 | lost = 0; | |
5034 | nsign = 0; | |
5035 | decflg = 0; | |
5036 | sgnflg = 0; | |
5037 | nexp = 0; | |
5038 | exp = 0; | |
5039 | prec = 0; | |
5040 | ecleaz (yy); | |
5041 | trail = 0; | |
5042 | ||
5043 | nxtcom: | |
5044 | k = *s - '0'; | |
5045 | if ((k >= 0) && (k <= 9)) | |
5046 | { | |
5047 | /* Ignore leading zeros */ | |
5048 | if ((prec == 0) && (decflg == 0) && (k == 0)) | |
5049 | goto donchr; | |
0f41302f | 5050 | /* Identify and strip trailing zeros after the decimal point. */ |
985b6196 RS |
5051 | if ((trail == 0) && (decflg != 0)) |
5052 | { | |
5053 | sp = s; | |
5054 | while ((*sp >= '0') && (*sp <= '9')) | |
5055 | ++sp; | |
5056 | /* Check for syntax error */ | |
5057 | c = *sp & 0x7f; | |
5058 | if ((c != 'e') && (c != 'E') && (c != '\0') | |
5059 | && (c != '\n') && (c != '\r') && (c != ' ') | |
5060 | && (c != ',')) | |
5061 | goto error; | |
5062 | --sp; | |
5063 | while (*sp == '0') | |
5064 | *sp-- = 'z'; | |
5065 | trail = 1; | |
5066 | if (*s == 'z') | |
5067 | goto donchr; | |
5068 | } | |
defb5dab | 5069 | |
985b6196 | 5070 | /* If enough digits were given to more than fill up the yy register, |
defb5dab RK |
5071 | continuing until overflow into the high guard word yy[2] |
5072 | guarantees that there will be a roundoff bit at the top | |
5073 | of the low guard word after normalization. */ | |
5074 | ||
985b6196 RS |
5075 | if (yy[2] == 0) |
5076 | { | |
5077 | if (decflg) | |
5078 | nexp += 1; /* count digits after decimal point */ | |
5079 | eshup1 (yy); /* multiply current number by 10 */ | |
5080 | emovz (yy, xt); | |
5081 | eshup1 (xt); | |
5082 | eshup1 (xt); | |
5083 | eaddm (xt, yy); | |
5084 | ecleaz (xt); | |
5085 | xt[NI - 2] = (unsigned EMUSHORT) k; | |
5086 | eaddm (xt, yy); | |
5087 | } | |
5088 | else | |
5089 | { | |
d73e9b8d | 5090 | /* Mark any lost non-zero digit. */ |
985b6196 | 5091 | lost |= k; |
d73e9b8d RS |
5092 | /* Count lost digits before the decimal point. */ |
5093 | if (decflg == 0) | |
5094 | nexp -= 1; | |
985b6196 RS |
5095 | } |
5096 | prec += 1; | |
5097 | goto donchr; | |
5098 | } | |
5099 | ||
5100 | switch (*s) | |
5101 | { | |
5102 | case 'z': | |
5103 | break; | |
5104 | case 'E': | |
5105 | case 'e': | |
5106 | goto expnt; | |
5107 | case '.': /* decimal point */ | |
5108 | if (decflg) | |
5109 | goto error; | |
5110 | ++decflg; | |
5111 | break; | |
5112 | case '-': | |
5113 | nsign = 0xffff; | |
5114 | if (sgnflg) | |
5115 | goto error; | |
5116 | ++sgnflg; | |
5117 | break; | |
5118 | case '+': | |
5119 | if (sgnflg) | |
5120 | goto error; | |
5121 | ++sgnflg; | |
5122 | break; | |
5123 | case ',': | |
5124 | case ' ': | |
5125 | case '\0': | |
5126 | case '\n': | |
5127 | case '\r': | |
5128 | goto daldone; | |
5129 | case 'i': | |
5130 | case 'I': | |
64685ffa | 5131 | goto infinite; |
985b6196 RS |
5132 | default: |
5133 | error: | |
66b6d60b RS |
5134 | #ifdef NANS |
5135 | einan (yy); | |
5136 | #else | |
985b6196 | 5137 | mtherr ("asctoe", DOMAIN); |
66b6d60b RS |
5138 | eclear (yy); |
5139 | #endif | |
985b6196 RS |
5140 | goto aexit; |
5141 | } | |
5142 | donchr: | |
5143 | ++s; | |
5144 | goto nxtcom; | |
5145 | ||
5146 | /* Exponent interpretation */ | |
5147 | expnt: | |
25a00742 RK |
5148 | /* 0.0eXXX is zero, regardless of XXX. Check for the 0.0. */ |
5149 | for (k = 0; k < NI; k++) | |
5150 | { | |
5151 | if (yy[k] != 0) | |
5152 | goto read_expnt; | |
5153 | } | |
5154 | goto aexit; | |
985b6196 | 5155 | |
25a00742 | 5156 | read_expnt: |
985b6196 RS |
5157 | esign = 1; |
5158 | exp = 0; | |
5159 | ++s; | |
5160 | /* check for + or - */ | |
5161 | if (*s == '-') | |
5162 | { | |
5163 | esign = -1; | |
5164 | ++s; | |
5165 | } | |
5166 | if (*s == '+') | |
5167 | ++s; | |
5168 | while ((*s >= '0') && (*s <= '9')) | |
5169 | { | |
5170 | exp *= 10; | |
5171 | exp += *s++ - '0'; | |
842fbaaa | 5172 | if (exp > -(MINDECEXP)) |
64685ffa RS |
5173 | { |
5174 | if (esign < 0) | |
5175 | goto zero; | |
5176 | else | |
5177 | goto infinite; | |
5178 | } | |
985b6196 RS |
5179 | } |
5180 | if (esign < 0) | |
5181 | exp = -exp; | |
842fbaaa | 5182 | if (exp > MAXDECEXP) |
64685ffa RS |
5183 | { |
5184 | infinite: | |
5185 | ecleaz (yy); | |
5186 | yy[E] = 0x7fff; /* infinity */ | |
5187 | goto aexit; | |
5188 | } | |
842fbaaa | 5189 | if (exp < MINDECEXP) |
64685ffa RS |
5190 | { |
5191 | zero: | |
5192 | ecleaz (yy); | |
5193 | goto aexit; | |
5194 | } | |
985b6196 RS |
5195 | |
5196 | daldone: | |
5197 | nexp = exp - nexp; | |
0f41302f | 5198 | /* Pad trailing zeros to minimize power of 10, per IEEE spec. */ |
985b6196 RS |
5199 | while ((nexp > 0) && (yy[2] == 0)) |
5200 | { | |
5201 | emovz (yy, xt); | |
5202 | eshup1 (xt); | |
5203 | eshup1 (xt); | |
5204 | eaddm (yy, xt); | |
5205 | eshup1 (xt); | |
5206 | if (xt[2] != 0) | |
5207 | break; | |
5208 | nexp -= 1; | |
5209 | emovz (xt, yy); | |
5210 | } | |
5211 | if ((k = enormlz (yy)) > NBITS) | |
5212 | { | |
5213 | ecleaz (yy); | |
5214 | goto aexit; | |
5215 | } | |
5216 | lexp = (EXONE - 1 + NBITS) - k; | |
5217 | emdnorm (yy, lost, 0, lexp, 64); | |
985b6196 | 5218 | |
defb5dab RK |
5219 | /* Convert to external format: |
5220 | ||
5221 | Multiply by 10**nexp. If precision is 64 bits, | |
5222 | the maximum relative error incurred in forming 10**n | |
5223 | for 0 <= n <= 324 is 8.2e-20, at 10**180. | |
5224 | For 0 <= n <= 999, the peak relative error is 1.4e-19 at 10**947. | |
5225 | For 0 >= n >= -999, it is -1.55e-19 at 10**-435. */ | |
985b6196 | 5226 | |
985b6196 RS |
5227 | lexp = yy[E]; |
5228 | if (nexp == 0) | |
5229 | { | |
5230 | k = 0; | |
5231 | goto expdon; | |
5232 | } | |
5233 | esign = 1; | |
5234 | if (nexp < 0) | |
5235 | { | |
5236 | nexp = -nexp; | |
5237 | esign = -1; | |
5238 | if (nexp > 4096) | |
defb5dab | 5239 | { |
0f41302f | 5240 | /* Punt. Can't handle this without 2 divides. */ |
985b6196 RS |
5241 | emovi (etens[0], tt); |
5242 | lexp -= tt[E]; | |
5243 | k = edivm (tt, yy); | |
5244 | lexp += EXONE; | |
5245 | nexp -= 4096; | |
5246 | } | |
5247 | } | |
5248 | p = &etens[NTEN][0]; | |
5249 | emov (eone, xt); | |
5250 | exp = 1; | |
5251 | do | |
5252 | { | |
5253 | if (exp & nexp) | |
5254 | emul (p, xt, xt); | |
5255 | p -= NE; | |
5256 | exp = exp + exp; | |
5257 | } | |
5258 | while (exp <= MAXP); | |
5259 | ||
5260 | emovi (xt, tt); | |
5261 | if (esign < 0) | |
5262 | { | |
5263 | lexp -= tt[E]; | |
5264 | k = edivm (tt, yy); | |
5265 | lexp += EXONE; | |
5266 | } | |
5267 | else | |
5268 | { | |
5269 | lexp += tt[E]; | |
5270 | k = emulm (tt, yy); | |
5271 | lexp -= EXONE - 1; | |
5272 | } | |
5273 | ||
5274 | expdon: | |
5275 | ||
5276 | /* Round and convert directly to the destination type */ | |
5277 | if (oprec == 53) | |
5278 | lexp -= EXONE - 0x3ff; | |
f5963e61 JL |
5279 | #ifdef C4X |
5280 | else if (oprec == 24 || oprec == 32) | |
5281 | lexp -= (EXONE - 0x7f); | |
5282 | #else | |
842fbaaa JW |
5283 | #ifdef IBM |
5284 | else if (oprec == 24 || oprec == 56) | |
5285 | lexp -= EXONE - (0x41 << 2); | |
5286 | #else | |
985b6196 RS |
5287 | else if (oprec == 24) |
5288 | lexp -= EXONE - 0177; | |
f5963e61 JL |
5289 | #endif /* IBM */ |
5290 | #endif /* C4X */ | |
985b6196 RS |
5291 | #ifdef DEC |
5292 | else if (oprec == 56) | |
5293 | lexp -= EXONE - 0201; | |
5294 | #endif | |
5295 | rndprc = oprec; | |
5296 | emdnorm (yy, k, 0, lexp, 64); | |
5297 | ||
5298 | aexit: | |
5299 | ||
5300 | rndprc = rndsav; | |
5301 | yy[0] = nsign; | |
5302 | switch (oprec) | |
5303 | { | |
5304 | #ifdef DEC | |
5305 | case 56: | |
5306 | todec (yy, y); /* see etodec.c */ | |
5307 | break; | |
842fbaaa JW |
5308 | #endif |
5309 | #ifdef IBM | |
5310 | case 56: | |
5311 | toibm (yy, y, DFmode); | |
5312 | break; | |
985b6196 | 5313 | #endif |
f5963e61 JL |
5314 | #ifdef C4X |
5315 | case 32: | |
5316 | toc4x (yy, y, HFmode); | |
5317 | break; | |
5318 | #endif | |
5319 | ||
985b6196 RS |
5320 | case 53: |
5321 | toe53 (yy, y); | |
5322 | break; | |
5323 | case 24: | |
5324 | toe24 (yy, y); | |
5325 | break; | |
5326 | case 64: | |
5327 | toe64 (yy, y); | |
5328 | break; | |
842fbaaa JW |
5329 | case 113: |
5330 | toe113 (yy, y); | |
5331 | break; | |
985b6196 RS |
5332 | case NBITS: |
5333 | emovo (yy, y); | |
5334 | break; | |
5335 | } | |
5336 | } | |
5337 | ||
5338 | ||
5339 | ||
8c35bbc5 RK |
5340 | /* Return Y = largest integer not greater than X (truncated toward minus |
5341 | infinity). */ | |
defb5dab | 5342 | |
985b6196 RS |
5343 | static unsigned EMUSHORT bmask[] = |
5344 | { | |
5345 | 0xffff, | |
5346 | 0xfffe, | |
5347 | 0xfffc, | |
5348 | 0xfff8, | |
5349 | 0xfff0, | |
5350 | 0xffe0, | |
5351 | 0xffc0, | |
5352 | 0xff80, | |
5353 | 0xff00, | |
5354 | 0xfe00, | |
5355 | 0xfc00, | |
5356 | 0xf800, | |
5357 | 0xf000, | |
5358 | 0xe000, | |
5359 | 0xc000, | |
5360 | 0x8000, | |
5361 | 0x0000, | |
5362 | }; | |
5363 | ||
a0353055 | 5364 | static void |
985b6196 RS |
5365 | efloor (x, y) |
5366 | unsigned EMUSHORT x[], y[]; | |
5367 | { | |
5368 | register unsigned EMUSHORT *p; | |
5369 | int e, expon, i; | |
5370 | unsigned EMUSHORT f[NE]; | |
5371 | ||
5372 | emov (x, f); /* leave in external format */ | |
5373 | expon = (int) f[NE - 1]; | |
5374 | e = (expon & 0x7fff) - (EXONE - 1); | |
5375 | if (e <= 0) | |
5376 | { | |
5377 | eclear (y); | |
5378 | goto isitneg; | |
5379 | } | |
5380 | /* number of bits to clear out */ | |
5381 | e = NBITS - e; | |
5382 | emov (f, y); | |
5383 | if (e <= 0) | |
5384 | return; | |
5385 | ||
5386 | p = &y[0]; | |
5387 | while (e >= 16) | |
5388 | { | |
5389 | *p++ = 0; | |
5390 | e -= 16; | |
5391 | } | |
5392 | /* clear the remaining bits */ | |
5393 | *p &= bmask[e]; | |
5394 | /* truncate negatives toward minus infinity */ | |
5395 | isitneg: | |
5396 | ||
5397 | if ((unsigned EMUSHORT) expon & (unsigned EMUSHORT) 0x8000) | |
5398 | { | |
5399 | for (i = 0; i < NE - 1; i++) | |
5400 | { | |
5401 | if (f[i] != y[i]) | |
5402 | { | |
5403 | esub (eone, y, y); | |
5404 | break; | |
5405 | } | |
5406 | } | |
5407 | } | |
5408 | } | |
5409 | ||
5410 | ||
8468c4a4 | 5411 | #if 0 |
8c35bbc5 RK |
5412 | /* Return S and EXP such that S * 2^EXP = X and .5 <= S < 1. |
5413 | For example, 1.1 = 0.55 * 2^1. */ | |
a0353055 RK |
5414 | |
5415 | static void | |
985b6196 RS |
5416 | efrexp (x, exp, s) |
5417 | unsigned EMUSHORT x[]; | |
5418 | int *exp; | |
5419 | unsigned EMUSHORT s[]; | |
5420 | { | |
5421 | unsigned EMUSHORT xi[NI]; | |
5422 | EMULONG li; | |
5423 | ||
5424 | emovi (x, xi); | |
8c35bbc5 | 5425 | /* Handle denormalized numbers properly using long integer exponent. */ |
985b6196 RS |
5426 | li = (EMULONG) ((EMUSHORT) xi[1]); |
5427 | ||
5428 | if (li == 0) | |
5429 | { | |
5430 | li -= enormlz (xi); | |
5431 | } | |
5432 | xi[1] = 0x3ffe; | |
5433 | emovo (xi, s); | |
5434 | *exp = (int) (li - 0x3ffe); | |
5435 | } | |
8468c4a4 | 5436 | #endif |
985b6196 | 5437 | |
8c35bbc5 | 5438 | /* Return e type Y = X * 2^PWR2. */ |
a0353055 RK |
5439 | |
5440 | static void | |
985b6196 RS |
5441 | eldexp (x, pwr2, y) |
5442 | unsigned EMUSHORT x[]; | |
5443 | int pwr2; | |
5444 | unsigned EMUSHORT y[]; | |
5445 | { | |
5446 | unsigned EMUSHORT xi[NI]; | |
5447 | EMULONG li; | |
5448 | int i; | |
5449 | ||
5450 | emovi (x, xi); | |
5451 | li = xi[1]; | |
5452 | li += pwr2; | |
5453 | i = 0; | |
5454 | emdnorm (xi, i, i, li, 64); | |
5455 | emovo (xi, y); | |
5456 | } | |
5457 | ||
5458 | ||
8468c4a4 | 5459 | #if 0 |
8c35bbc5 RK |
5460 | /* C = remainder after dividing B by A, all e type values. |
5461 | Least significant integer quotient bits left in EQUOT. */ | |
a0353055 RK |
5462 | |
5463 | static void | |
985b6196 RS |
5464 | eremain (a, b, c) |
5465 | unsigned EMUSHORT a[], b[], c[]; | |
5466 | { | |
5467 | unsigned EMUSHORT den[NI], num[NI]; | |
5468 | ||
66b6d60b | 5469 | #ifdef NANS |
242cef1e RS |
5470 | if (eisinf (b) |
5471 | || (ecmp (a, ezero) == 0) | |
5472 | || eisnan (a) | |
5473 | || eisnan (b)) | |
66b6d60b | 5474 | { |
29e11dab | 5475 | enan (c, 0); |
66b6d60b RS |
5476 | return; |
5477 | } | |
5478 | #endif | |
985b6196 RS |
5479 | if (ecmp (a, ezero) == 0) |
5480 | { | |
5481 | mtherr ("eremain", SING); | |
5482 | eclear (c); | |
5483 | return; | |
5484 | } | |
5485 | emovi (a, den); | |
5486 | emovi (b, num); | |
5487 | eiremain (den, num); | |
5488 | /* Sign of remainder = sign of quotient */ | |
5489 | if (a[0] == b[0]) | |
5490 | num[0] = 0; | |
5491 | else | |
5492 | num[0] = 0xffff; | |
5493 | emovo (num, c); | |
5494 | } | |
8468c4a4 | 5495 | #endif |
985b6196 | 5496 | |
8c35bbc5 RK |
5497 | /* Return quotient of exploded e-types NUM / DEN in EQUOT, |
5498 | remainder in NUM. */ | |
5499 | ||
a0353055 | 5500 | static void |
985b6196 RS |
5501 | eiremain (den, num) |
5502 | unsigned EMUSHORT den[], num[]; | |
5503 | { | |
5504 | EMULONG ld, ln; | |
5505 | unsigned EMUSHORT j; | |
5506 | ||
5507 | ld = den[E]; | |
5508 | ld -= enormlz (den); | |
5509 | ln = num[E]; | |
5510 | ln -= enormlz (num); | |
5511 | ecleaz (equot); | |
5512 | while (ln >= ld) | |
5513 | { | |
5514 | if (ecmpm (den, num) <= 0) | |
5515 | { | |
5516 | esubm (den, num); | |
5517 | j = 1; | |
5518 | } | |
5519 | else | |
985b6196 | 5520 | j = 0; |
985b6196 RS |
5521 | eshup1 (equot); |
5522 | equot[NI - 1] |= j; | |
5523 | eshup1 (num); | |
5524 | ln -= 1; | |
5525 | } | |
5526 | emdnorm (num, 0, 0, ln, 0); | |
5527 | } | |
5528 | ||
8c35bbc5 RK |
5529 | /* Report an error condition CODE encountered in function NAME. |
5530 | CODE is one of the following: | |
defb5dab RK |
5531 | |
5532 | Mnemonic Value Significance | |
5533 | ||
5534 | DOMAIN 1 argument domain error | |
5535 | SING 2 function singularity | |
5536 | OVERFLOW 3 overflow range error | |
5537 | UNDERFLOW 4 underflow range error | |
5538 | TLOSS 5 total loss of precision | |
5539 | PLOSS 6 partial loss of precision | |
5540 | INVALID 7 NaN - producing operation | |
5541 | EDOM 33 Unix domain error code | |
5542 | ERANGE 34 Unix range error code | |
5543 | ||
8c35bbc5 | 5544 | The order of appearance of the following messages is bound to the |
defb5dab | 5545 | error codes defined above. */ |
985b6196 | 5546 | |
66b6d60b RS |
5547 | #define NMSGS 8 |
5548 | static char *ermsg[NMSGS] = | |
985b6196 RS |
5549 | { |
5550 | "unknown", /* error code 0 */ | |
5551 | "domain", /* error code 1 */ | |
5552 | "singularity", /* et seq. */ | |
5553 | "overflow", | |
5554 | "underflow", | |
5555 | "total loss of precision", | |
66b6d60b RS |
5556 | "partial loss of precision", |
5557 | "invalid operation" | |
985b6196 RS |
5558 | }; |
5559 | ||
5560 | int merror = 0; | |
5561 | extern int merror; | |
5562 | ||
a0353055 | 5563 | static void |
985b6196 RS |
5564 | mtherr (name, code) |
5565 | char *name; | |
5566 | int code; | |
5567 | { | |
5568 | char errstr[80]; | |
5569 | ||
8c35bbc5 | 5570 | /* The string passed by the calling program is supposed to be the |
defb5dab | 5571 | name of the function in which the error occurred. |
8c35bbc5 | 5572 | The code argument selects which error message string will be printed. */ |
985b6196 | 5573 | |
66b6d60b | 5574 | if ((code <= 0) || (code >= NMSGS)) |
985b6196 | 5575 | code = 0; |
a8d78514 | 5576 | sprintf (errstr, " %s %s error", name, ermsg[code]); |
64685ffa RS |
5577 | if (extra_warnings) |
5578 | warning (errstr); | |
985b6196 RS |
5579 | /* Set global error message word */ |
5580 | merror = code + 1; | |
985b6196 RS |
5581 | } |
5582 | ||
842fbaaa | 5583 | #ifdef DEC |
8c35bbc5 | 5584 | /* Convert DEC double precision D to e type E. */ |
a0353055 RK |
5585 | |
5586 | static void | |
985b6196 RS |
5587 | dectoe (d, e) |
5588 | unsigned EMUSHORT *d; | |
5589 | unsigned EMUSHORT *e; | |
5590 | { | |
5591 | unsigned EMUSHORT y[NI]; | |
5592 | register unsigned EMUSHORT r, *p; | |
5593 | ||
5594 | ecleaz (y); /* start with a zero */ | |
5595 | p = y; /* point to our number */ | |
5596 | r = *d; /* get DEC exponent word */ | |
5597 | if (*d & (unsigned int) 0x8000) | |
5598 | *p = 0xffff; /* fill in our sign */ | |
5599 | ++p; /* bump pointer to our exponent word */ | |
5600 | r &= 0x7fff; /* strip the sign bit */ | |
5601 | if (r == 0) /* answer = 0 if high order DEC word = 0 */ | |
5602 | goto done; | |
5603 | ||
5604 | ||
5605 | r >>= 7; /* shift exponent word down 7 bits */ | |
5606 | r += EXONE - 0201; /* subtract DEC exponent offset */ | |
5607 | /* add our e type exponent offset */ | |
5608 | *p++ = r; /* to form our exponent */ | |
5609 | ||
5610 | r = *d++; /* now do the high order mantissa */ | |
5611 | r &= 0177; /* strip off the DEC exponent and sign bits */ | |
5612 | r |= 0200; /* the DEC understood high order mantissa bit */ | |
5613 | *p++ = r; /* put result in our high guard word */ | |
5614 | ||
5615 | *p++ = *d++; /* fill in the rest of our mantissa */ | |
5616 | *p++ = *d++; | |
5617 | *p = *d; | |
5618 | ||
5619 | eshdn8 (y); /* shift our mantissa down 8 bits */ | |
5620 | done: | |
5621 | emovo (y, e); | |
5622 | } | |
5623 | ||
8c35bbc5 | 5624 | /* Convert e type X to DEC double precision D. */ |
985b6196 | 5625 | |
a0353055 | 5626 | static void |
985b6196 RS |
5627 | etodec (x, d) |
5628 | unsigned EMUSHORT *x, *d; | |
5629 | { | |
5630 | unsigned EMUSHORT xi[NI]; | |
842fbaaa JW |
5631 | EMULONG exp; |
5632 | int rndsav; | |
985b6196 RS |
5633 | |
5634 | emovi (x, xi); | |
8c35bbc5 RK |
5635 | /* Adjust exponent for offsets. */ |
5636 | exp = (EMULONG) xi[E] - (EXONE - 0201); | |
5637 | /* Round off to nearest or even. */ | |
985b6196 RS |
5638 | rndsav = rndprc; |
5639 | rndprc = 56; | |
5640 | emdnorm (xi, 0, 0, exp, 64); | |
5641 | rndprc = rndsav; | |
5642 | todec (xi, d); | |
5643 | } | |
5644 | ||
8c35bbc5 RK |
5645 | /* Convert exploded e-type X, that has already been rounded to |
5646 | 56-bit precision, to DEC format double Y. */ | |
5647 | ||
a0353055 | 5648 | static void |
985b6196 RS |
5649 | todec (x, y) |
5650 | unsigned EMUSHORT *x, *y; | |
5651 | { | |
5652 | unsigned EMUSHORT i; | |
5653 | unsigned EMUSHORT *p; | |
5654 | ||
5655 | p = x; | |
5656 | *y = 0; | |
5657 | if (*p++) | |
5658 | *y = 0100000; | |
5659 | i = *p++; | |
5660 | if (i == 0) | |
5661 | { | |
5662 | *y++ = 0; | |
5663 | *y++ = 0; | |
5664 | *y++ = 0; | |
5665 | *y++ = 0; | |
5666 | return; | |
5667 | } | |
5668 | if (i > 0377) | |
5669 | { | |
5670 | *y++ |= 077777; | |
5671 | *y++ = 0xffff; | |
5672 | *y++ = 0xffff; | |
5673 | *y++ = 0xffff; | |
64685ffa RS |
5674 | #ifdef ERANGE |
5675 | errno = ERANGE; | |
5676 | #endif | |
985b6196 RS |
5677 | return; |
5678 | } | |
5679 | i &= 0377; | |
5680 | i <<= 7; | |
5681 | eshup8 (x); | |
5682 | x[M] &= 0177; | |
5683 | i |= x[M]; | |
5684 | *y++ |= i; | |
5685 | *y++ = x[M + 1]; | |
5686 | *y++ = x[M + 2]; | |
5687 | *y++ = x[M + 3]; | |
5688 | } | |
842fbaaa JW |
5689 | #endif /* DEC */ |
5690 | ||
5691 | #ifdef IBM | |
defb5dab | 5692 | /* Convert IBM single/double precision to e type. */ |
a0353055 RK |
5693 | |
5694 | static void | |
842fbaaa JW |
5695 | ibmtoe (d, e, mode) |
5696 | unsigned EMUSHORT *d; | |
5697 | unsigned EMUSHORT *e; | |
5698 | enum machine_mode mode; | |
5699 | { | |
5700 | unsigned EMUSHORT y[NI]; | |
5701 | register unsigned EMUSHORT r, *p; | |
5702 | int rndsav; | |
5703 | ||
5704 | ecleaz (y); /* start with a zero */ | |
5705 | p = y; /* point to our number */ | |
5706 | r = *d; /* get IBM exponent word */ | |
5707 | if (*d & (unsigned int) 0x8000) | |
5708 | *p = 0xffff; /* fill in our sign */ | |
5709 | ++p; /* bump pointer to our exponent word */ | |
5710 | r &= 0x7f00; /* strip the sign bit */ | |
5711 | r >>= 6; /* shift exponent word down 6 bits */ | |
5712 | /* in fact shift by 8 right and 2 left */ | |
5713 | r += EXONE - (0x41 << 2); /* subtract IBM exponent offset */ | |
5714 | /* add our e type exponent offset */ | |
5715 | *p++ = r; /* to form our exponent */ | |
5716 | ||
5717 | *p++ = *d++ & 0xff; /* now do the high order mantissa */ | |
5718 | /* strip off the IBM exponent and sign bits */ | |
5719 | if (mode != SFmode) /* there are only 2 words in SFmode */ | |
5720 | { | |
5721 | *p++ = *d++; /* fill in the rest of our mantissa */ | |
5722 | *p++ = *d++; | |
5723 | } | |
5724 | *p = *d; | |
5725 | ||
5726 | if (y[M] == 0 && y[M+1] == 0 && y[M+2] == 0 && y[M+3] == 0) | |
5727 | y[0] = y[E] = 0; | |
5728 | else | |
5729 | y[E] -= 5 + enormlz (y); /* now normalise the mantissa */ | |
5730 | /* handle change in RADIX */ | |
5731 | emovo (y, e); | |
5732 | } | |
5733 | ||
985b6196 | 5734 | |
985b6196 | 5735 | |
defb5dab | 5736 | /* Convert e type to IBM single/double precision. */ |
842fbaaa | 5737 | |
a0353055 | 5738 | static void |
842fbaaa JW |
5739 | etoibm (x, d, mode) |
5740 | unsigned EMUSHORT *x, *d; | |
5741 | enum machine_mode mode; | |
5742 | { | |
5743 | unsigned EMUSHORT xi[NI]; | |
5744 | EMULONG exp; | |
5745 | int rndsav; | |
5746 | ||
5747 | emovi (x, xi); | |
5748 | exp = (EMULONG) xi[E] - (EXONE - (0x41 << 2)); /* adjust exponent for offsets */ | |
5749 | /* round off to nearest or even */ | |
5750 | rndsav = rndprc; | |
5751 | rndprc = 56; | |
5752 | emdnorm (xi, 0, 0, exp, 64); | |
5753 | rndprc = rndsav; | |
5754 | toibm (xi, d, mode); | |
5755 | } | |
5756 | ||
a0353055 | 5757 | static void |
842fbaaa JW |
5758 | toibm (x, y, mode) |
5759 | unsigned EMUSHORT *x, *y; | |
5760 | enum machine_mode mode; | |
5761 | { | |
5762 | unsigned EMUSHORT i; | |
5763 | unsigned EMUSHORT *p; | |
5764 | int r; | |
5765 | ||
5766 | p = x; | |
5767 | *y = 0; | |
5768 | if (*p++) | |
5769 | *y = 0x8000; | |
5770 | i = *p++; | |
5771 | if (i == 0) | |
5772 | { | |
5773 | *y++ = 0; | |
5774 | *y++ = 0; | |
5775 | if (mode != SFmode) | |
5776 | { | |
5777 | *y++ = 0; | |
5778 | *y++ = 0; | |
5779 | } | |
5780 | return; | |
5781 | } | |
5782 | r = i & 0x3; | |
5783 | i >>= 2; | |
5784 | if (i > 0x7f) | |
5785 | { | |
5786 | *y++ |= 0x7fff; | |
5787 | *y++ = 0xffff; | |
5788 | if (mode != SFmode) | |
5789 | { | |
5790 | *y++ = 0xffff; | |
5791 | *y++ = 0xffff; | |
5792 | } | |
5793 | #ifdef ERANGE | |
5794 | errno = ERANGE; | |
5795 | #endif | |
5796 | return; | |
5797 | } | |
5798 | i &= 0x7f; | |
5799 | *y |= (i << 8); | |
5800 | eshift (x, r + 5); | |
5801 | *y++ |= x[M]; | |
5802 | *y++ = x[M + 1]; | |
5803 | if (mode != SFmode) | |
5804 | { | |
5805 | *y++ = x[M + 2]; | |
5806 | *y++ = x[M + 3]; | |
5807 | } | |
5808 | } | |
5809 | #endif /* IBM */ | |
66b6d60b | 5810 | |
f5963e61 JL |
5811 | |
5812 | #ifdef C4X | |
5813 | /* Convert C4X single/double precision to e type. */ | |
5814 | ||
5815 | static void | |
5816 | c4xtoe (d, e, mode) | |
5817 | unsigned EMUSHORT *d; | |
5818 | unsigned EMUSHORT *e; | |
5819 | enum machine_mode mode; | |
5820 | { | |
5821 | unsigned EMUSHORT y[NI]; | |
5822 | int r; | |
5823 | int rndsav; | |
5824 | int isnegative; | |
5825 | int size; | |
5826 | int i; | |
5827 | int carry; | |
5828 | ||
5829 | /* Short-circuit the zero case. */ | |
5830 | if ((d[0] == 0x8000) | |
5831 | && (d[1] == 0x0000) | |
5832 | && ((mode == QFmode) || ((d[2] == 0x0000) && (d[3] == 0x0000)))) | |
5833 | { | |
5834 | e[0] = 0; | |
5835 | e[1] = 0; | |
5836 | e[2] = 0; | |
5837 | e[3] = 0; | |
5838 | e[4] = 0; | |
5839 | e[5] = 0; | |
5840 | return; | |
5841 | } | |
5842 | ||
5843 | ecleaz (y); /* start with a zero */ | |
5844 | r = d[0]; /* get sign/exponent part */ | |
5845 | if (r & (unsigned int) 0x0080) | |
5846 | { | |
5847 | y[0] = 0xffff; /* fill in our sign */ | |
5848 | isnegative = TRUE; | |
5849 | } | |
5850 | else | |
5851 | { | |
5852 | isnegative = FALSE; | |
5853 | } | |
5854 | ||
5855 | r >>= 8; /* Shift exponent word down 8 bits. */ | |
5856 | if (r & 0x80) /* Make the exponent negative if it is. */ | |
5857 | { | |
5858 | r = r | (~0 & ~0xff); | |
5859 | } | |
5860 | ||
5861 | if (isnegative) | |
5862 | { | |
5863 | /* Now do the high order mantissa. We don't "or" on the high bit | |
5864 | because it is 2 (not 1) and is handled a little differently | |
5865 | below. */ | |
5866 | y[M] = d[0] & 0x7f; | |
5867 | ||
5868 | y[M+1] = d[1]; | |
5869 | if (mode != QFmode) /* There are only 2 words in QFmode. */ | |
5870 | { | |
5871 | y[M+2] = d[2]; /* Fill in the rest of our mantissa. */ | |
5872 | y[M+3] = d[3]; | |
5873 | size = 4; | |
5874 | } | |
5875 | else | |
5876 | { | |
5877 | size = 2; | |
5878 | } | |
5879 | eshift(y, -8); | |
5880 | ||
5881 | /* Now do the two's complement on the data. */ | |
5882 | ||
5883 | carry = 1; /* Initially add 1 for the two's complement. */ | |
5884 | for (i=size + M; i > M; i--) | |
5885 | { | |
5886 | if (carry && (y[i] == 0x0000)) | |
5887 | { | |
5888 | /* We overflowed into the next word, carry is the same. */ | |
5889 | y[i] = carry ? 0x0000 : 0xffff; | |
5890 | } | |
5891 | else | |
5892 | { | |
5893 | /* No overflow, just invert and add carry. */ | |
5894 | y[i] = ((~y[i]) + carry) & 0xffff; | |
5895 | carry = 0; | |
5896 | } | |
5897 | } | |
5898 | ||
5899 | if (carry) | |
5900 | { | |
5901 | eshift(y, -1); | |
5902 | y[M+1] |= 0x8000; | |
5903 | r++; | |
5904 | } | |
5905 | y[1] = r + EXONE; | |
5906 | } | |
5907 | else | |
5908 | { | |
5909 | /* Add our e type exponent offset to form our exponent. */ | |
5910 | r += EXONE; | |
5911 | y[1] = r; | |
5912 | ||
5913 | /* Now do the high order mantissa strip off the exponent and sign | |
5914 | bits and add the high 1 bit. */ | |
5915 | y[M] = d[0] & 0x7f | 0x80; | |
5916 | ||
5917 | y[M+1] = d[1]; | |
5918 | if (mode != QFmode) /* There are only 2 words in QFmode. */ | |
5919 | { | |
5920 | y[M+2] = d[2]; /* Fill in the rest of our mantissa. */ | |
5921 | y[M+3] = d[3]; | |
5922 | } | |
5923 | eshift(y, -8); | |
5924 | } | |
5925 | ||
5926 | emovo (y, e); | |
5927 | } | |
5928 | ||
5929 | ||
5930 | /* Convert e type to C4X single/double precision. */ | |
5931 | ||
5932 | static void | |
5933 | etoc4x (x, d, mode) | |
5934 | unsigned EMUSHORT *x, *d; | |
5935 | enum machine_mode mode; | |
5936 | { | |
5937 | unsigned EMUSHORT xi[NI]; | |
5938 | EMULONG exp; | |
5939 | int rndsav; | |
5940 | ||
5941 | emovi (x, xi); | |
5942 | ||
5943 | /* Adjust exponent for offsets. */ | |
5944 | exp = (EMULONG) xi[E] - (EXONE - 0x7f); | |
5945 | ||
5946 | /* Round off to nearest or even. */ | |
5947 | rndsav = rndprc; | |
5948 | rndprc = mode == QFmode ? 24 : 32; | |
5949 | emdnorm (xi, 0, 0, exp, 64); | |
5950 | rndprc = rndsav; | |
5951 | toc4x (xi, d, mode); | |
5952 | } | |
5953 | ||
5954 | static void | |
5955 | toc4x (x, y, mode) | |
5956 | unsigned EMUSHORT *x, *y; | |
5957 | enum machine_mode mode; | |
5958 | { | |
5959 | int i; | |
5960 | int r; | |
5961 | int v; | |
5962 | int carry; | |
5963 | ||
5964 | /* Short-circuit the zero case */ | |
5965 | if ((x[0] == 0) /* Zero exponent and sign */ | |
5966 | && (x[1] == 0) | |
5967 | && (x[M] == 0) /* The rest is for zero mantissa */ | |
5968 | && (x[M+1] == 0) | |
5969 | /* Only check for double if necessary */ | |
5970 | && ((mode == QFmode) || ((x[M+2] == 0) && (x[M+3] == 0)))) | |
5971 | { | |
5972 | /* We have a zero. Put it into the output and return. */ | |
5973 | *y++ = 0x8000; | |
5974 | *y++ = 0x0000; | |
5975 | if (mode != QFmode) | |
5976 | { | |
5977 | *y++ = 0x0000; | |
5978 | *y++ = 0x0000; | |
5979 | } | |
5980 | return; | |
5981 | } | |
5982 | ||
5983 | *y = 0; | |
5984 | ||
5985 | /* Negative number require a two's complement conversion of the | |
5986 | mantissa. */ | |
5987 | if (x[0]) | |
5988 | { | |
5989 | *y = 0x0080; | |
5990 | ||
5991 | i = ((int) x[1]) - 0x7f; | |
5992 | ||
5993 | /* Now add 1 to the inverted data to do the two's complement. */ | |
5994 | if (mode != QFmode) | |
5995 | v = 4 + M; | |
5996 | else | |
5997 | v = 2 + M; | |
5998 | carry = 1; | |
5999 | while (v > M) | |
6000 | { | |
6001 | if (x[v] == 0x0000) | |
6002 | { | |
6003 | x[v] = carry ? 0x0000 : 0xffff; | |
6004 | } | |
6005 | else | |
6006 | { | |
6007 | x[v] = ((~x[v]) + carry) & 0xffff; | |
6008 | carry = 0; | |
6009 | } | |
6010 | v--; | |
6011 | } | |
6012 | ||
6013 | /* The following is a special case. The C4X negative float requires | |
6014 | a zero in the high bit (because the format is (2 - x) x 2^m), so | |
6015 | if a one is in that bit, we have to shift left one to get rid | |
6016 | of it. This only occurs if the number is -1 x 2^m. */ | |
6017 | if (x[M+1] & 0x8000) | |
6018 | { | |
6019 | /* This is the case of -1 x 2^m, we have to rid ourselves of the | |
6020 | high sign bit and shift the exponent. */ | |
6021 | eshift(x, 1); | |
6022 | i--; | |
6023 | } | |
6024 | } | |
6025 | else | |
6026 | { | |
6027 | i = ((int) x[1]) - 0x7f; | |
6028 | } | |
6029 | ||
6030 | if ((i < -128) || (i > 127)) | |
6031 | { | |
6032 | y[0] |= 0xff7f; | |
6033 | y[1] = 0xffff; | |
6034 | if (mode != QFmode) | |
6035 | { | |
6036 | y[2] = 0xffff; | |
6037 | y[3] = 0xffff; | |
6038 | } | |
6039 | #ifdef ERANGE | |
6040 | errno = ERANGE; | |
6041 | #endif | |
6042 | return; | |
6043 | } | |
6044 | ||
6045 | y[0] |= ((i & 0xff) << 8); | |
6046 | ||
6047 | eshift (x, 8); | |
6048 | ||
6049 | y[0] |= x[M] & 0x7f; | |
6050 | y[1] = x[M + 1]; | |
6051 | if (mode != QFmode) | |
6052 | { | |
6053 | y[2] = x[M + 2]; | |
6054 | y[3] = x[M + 3]; | |
6055 | } | |
6056 | } | |
6057 | #endif /* C4X */ | |
6058 | ||
66b6d60b RS |
6059 | /* Output a binary NaN bit pattern in the target machine's format. */ |
6060 | ||
6061 | /* If special NaN bit patterns are required, define them in tm.h | |
6062 | as arrays of unsigned 16-bit shorts. Otherwise, use the default | |
0f41302f | 6063 | patterns here. */ |
7729f1ca RS |
6064 | #ifdef TFMODE_NAN |
6065 | TFMODE_NAN; | |
6066 | #else | |
f76b9db2 ILT |
6067 | #ifdef IEEE |
6068 | unsigned EMUSHORT TFbignan[8] = | |
66b6d60b | 6069 | {0x7fff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff}; |
f76b9db2 | 6070 | unsigned EMUSHORT TFlittlenan[8] = {0, 0, 0, 0, 0, 0, 0x8000, 0xffff}; |
66b6d60b RS |
6071 | #endif |
6072 | #endif | |
6073 | ||
7729f1ca RS |
6074 | #ifdef XFMODE_NAN |
6075 | XFMODE_NAN; | |
6076 | #else | |
f76b9db2 ILT |
6077 | #ifdef IEEE |
6078 | unsigned EMUSHORT XFbignan[6] = | |
6079 | {0x7fff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff}; | |
6080 | unsigned EMUSHORT XFlittlenan[6] = {0, 0, 0, 0xc000, 0xffff, 0}; | |
66b6d60b RS |
6081 | #endif |
6082 | #endif | |
6083 | ||
7729f1ca RS |
6084 | #ifdef DFMODE_NAN |
6085 | DFMODE_NAN; | |
6086 | #else | |
f76b9db2 ILT |
6087 | #ifdef IEEE |
6088 | unsigned EMUSHORT DFbignan[4] = {0x7fff, 0xffff, 0xffff, 0xffff}; | |
6089 | unsigned EMUSHORT DFlittlenan[4] = {0, 0, 0, 0xfff8}; | |
66b6d60b RS |
6090 | #endif |
6091 | #endif | |
6092 | ||
7729f1ca RS |
6093 | #ifdef SFMODE_NAN |
6094 | SFMODE_NAN; | |
6095 | #else | |
f76b9db2 ILT |
6096 | #ifdef IEEE |
6097 | unsigned EMUSHORT SFbignan[2] = {0x7fff, 0xffff}; | |
6098 | unsigned EMUSHORT SFlittlenan[2] = {0, 0xffc0}; | |
66b6d60b RS |
6099 | #endif |
6100 | #endif | |
6101 | ||
6102 | ||
a0353055 | 6103 | static void |
29e11dab | 6104 | make_nan (nan, sign, mode) |
a0353055 RK |
6105 | unsigned EMUSHORT *nan; |
6106 | int sign; | |
6107 | enum machine_mode mode; | |
66b6d60b | 6108 | { |
29e11dab | 6109 | int n; |
66b6d60b RS |
6110 | unsigned EMUSHORT *p; |
6111 | ||
6112 | switch (mode) | |
6113 | { | |
6114 | /* Possibly the `reserved operand' patterns on a VAX can be | |
0f41302f | 6115 | used like NaN's, but probably not in the same way as IEEE. */ |
f5963e61 | 6116 | #if !defined(DEC) && !defined(IBM) && !defined(C4X) |
66b6d60b RS |
6117 | case TFmode: |
6118 | n = 8; | |
8c35bbc5 | 6119 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
6120 | p = TFbignan; |
6121 | else | |
6122 | p = TFlittlenan; | |
66b6d60b | 6123 | break; |
f5963e61 | 6124 | |
66b6d60b RS |
6125 | case XFmode: |
6126 | n = 6; | |
8c35bbc5 | 6127 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
6128 | p = XFbignan; |
6129 | else | |
6130 | p = XFlittlenan; | |
66b6d60b | 6131 | break; |
f5963e61 | 6132 | |
66b6d60b RS |
6133 | case DFmode: |
6134 | n = 4; | |
8c35bbc5 | 6135 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
6136 | p = DFbignan; |
6137 | else | |
6138 | p = DFlittlenan; | |
66b6d60b | 6139 | break; |
f5963e61 | 6140 | |
66b6d60b | 6141 | case SFmode: |
f5963e61 | 6142 | case HFmode: |
66b6d60b | 6143 | n = 2; |
8c35bbc5 | 6144 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
6145 | p = SFbignan; |
6146 | else | |
6147 | p = SFlittlenan; | |
66b6d60b RS |
6148 | break; |
6149 | #endif | |
f5963e61 | 6150 | |
66b6d60b RS |
6151 | default: |
6152 | abort (); | |
6153 | } | |
8c35bbc5 | 6154 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 6155 | *nan++ = (sign << 15) | *p++; |
29e11dab | 6156 | while (--n != 0) |
66b6d60b | 6157 | *nan++ = *p++; |
8c35bbc5 | 6158 | if (! REAL_WORDS_BIG_ENDIAN) |
f76b9db2 | 6159 | *nan = (sign << 15) | *p; |
66b6d60b RS |
6160 | } |
6161 | ||
7bb6fbd1 | 6162 | /* This is the inverse of the function `etarsingle' invoked by |
b31c244f RS |
6163 | REAL_VALUE_TO_TARGET_SINGLE. */ |
6164 | ||
7bb6fbd1 JL |
6165 | REAL_VALUE_TYPE |
6166 | ereal_unto_float (f) | |
6167 | long f; | |
6168 | { | |
6169 | REAL_VALUE_TYPE r; | |
6170 | unsigned EMUSHORT s[2]; | |
6171 | unsigned EMUSHORT e[NE]; | |
6172 | ||
6173 | /* Convert 32 bit integer to array of 16 bit pieces in target machine order. | |
6174 | This is the inverse operation to what the function `endian' does. */ | |
6175 | if (REAL_WORDS_BIG_ENDIAN) | |
6176 | { | |
6177 | s[0] = (unsigned EMUSHORT) (f >> 16); | |
6178 | s[1] = (unsigned EMUSHORT) f; | |
6179 | } | |
6180 | else | |
6181 | { | |
6182 | s[0] = (unsigned EMUSHORT) f; | |
6183 | s[1] = (unsigned EMUSHORT) (f >> 16); | |
6184 | } | |
6185 | /* Convert and promote the target float to E-type. */ | |
6186 | e24toe (s, e); | |
6187 | /* Output E-type to REAL_VALUE_TYPE. */ | |
6188 | PUT_REAL (e, &r); | |
6189 | return r; | |
6190 | } | |
6191 | ||
6192 | ||
6193 | /* This is the inverse of the function `etardouble' invoked by | |
6194 | REAL_VALUE_TO_TARGET_DOUBLE. */ | |
6195 | ||
6196 | REAL_VALUE_TYPE | |
6197 | ereal_unto_double (d) | |
6198 | long d[]; | |
6199 | { | |
6200 | REAL_VALUE_TYPE r; | |
6201 | unsigned EMUSHORT s[4]; | |
6202 | unsigned EMUSHORT e[NE]; | |
6203 | ||
6204 | /* Convert array of HOST_WIDE_INT to equivalent array of 16-bit pieces. */ | |
6205 | if (REAL_WORDS_BIG_ENDIAN) | |
6206 | { | |
6207 | s[0] = (unsigned EMUSHORT) (d[0] >> 16); | |
6208 | s[1] = (unsigned EMUSHORT) d[0]; | |
6209 | s[2] = (unsigned EMUSHORT) (d[1] >> 16); | |
6210 | s[3] = (unsigned EMUSHORT) d[1]; | |
6211 | } | |
6212 | else | |
6213 | { | |
6214 | /* Target float words are little-endian. */ | |
6215 | s[0] = (unsigned EMUSHORT) d[0]; | |
6216 | s[1] = (unsigned EMUSHORT) (d[0] >> 16); | |
6217 | s[2] = (unsigned EMUSHORT) d[1]; | |
6218 | s[3] = (unsigned EMUSHORT) (d[1] >> 16); | |
6219 | } | |
6220 | /* Convert target double to E-type. */ | |
6221 | e53toe (s, e); | |
6222 | /* Output E-type to REAL_VALUE_TYPE. */ | |
6223 | PUT_REAL (e, &r); | |
6224 | return r; | |
6225 | } | |
6226 | ||
6227 | ||
6228 | /* Convert an SFmode target `float' value to a REAL_VALUE_TYPE. | |
6229 | This is somewhat like ereal_unto_float, but the input types | |
6230 | for these are different. */ | |
6231 | ||
b31c244f RS |
6232 | REAL_VALUE_TYPE |
6233 | ereal_from_float (f) | |
04ae9e4c | 6234 | HOST_WIDE_INT f; |
b31c244f RS |
6235 | { |
6236 | REAL_VALUE_TYPE r; | |
6237 | unsigned EMUSHORT s[2]; | |
6238 | unsigned EMUSHORT e[NE]; | |
6239 | ||
6240 | /* Convert 32 bit integer to array of 16 bit pieces in target machine order. | |
6241 | This is the inverse operation to what the function `endian' does. */ | |
8c35bbc5 | 6242 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
6243 | { |
6244 | s[0] = (unsigned EMUSHORT) (f >> 16); | |
6245 | s[1] = (unsigned EMUSHORT) f; | |
6246 | } | |
6247 | else | |
6248 | { | |
6249 | s[0] = (unsigned EMUSHORT) f; | |
6250 | s[1] = (unsigned EMUSHORT) (f >> 16); | |
6251 | } | |
0f41302f | 6252 | /* Convert and promote the target float to E-type. */ |
b31c244f | 6253 | e24toe (s, e); |
0f41302f | 6254 | /* Output E-type to REAL_VALUE_TYPE. */ |
b31c244f RS |
6255 | PUT_REAL (e, &r); |
6256 | return r; | |
6257 | } | |
6258 | ||
842fbaaa | 6259 | |
b31c244f | 6260 | /* Convert a DFmode target `double' value to a REAL_VALUE_TYPE. |
7bb6fbd1 JL |
6261 | This is somewhat like ereal_unto_double, but the input types |
6262 | for these are different. | |
b31c244f | 6263 | |
04ae9e4c RK |
6264 | The DFmode is stored as an array of HOST_WIDE_INT in the target's |
6265 | data format, with no holes in the bit packing. The first element | |
b31c244f RS |
6266 | of the input array holds the bits that would come first in the |
6267 | target computer's memory. */ | |
6268 | ||
6269 | REAL_VALUE_TYPE | |
6270 | ereal_from_double (d) | |
04ae9e4c | 6271 | HOST_WIDE_INT d[]; |
b31c244f RS |
6272 | { |
6273 | REAL_VALUE_TYPE r; | |
6274 | unsigned EMUSHORT s[4]; | |
6275 | unsigned EMUSHORT e[NE]; | |
6276 | ||
04ae9e4c | 6277 | /* Convert array of HOST_WIDE_INT to equivalent array of 16-bit pieces. */ |
8c35bbc5 | 6278 | if (REAL_WORDS_BIG_ENDIAN) |
f76b9db2 ILT |
6279 | { |
6280 | s[0] = (unsigned EMUSHORT) (d[0] >> 16); | |
6281 | s[1] = (unsigned EMUSHORT) d[0]; | |
60e61165 | 6282 | #if HOST_BITS_PER_WIDE_INT == 32 |
f76b9db2 ILT |
6283 | s[2] = (unsigned EMUSHORT) (d[1] >> 16); |
6284 | s[3] = (unsigned EMUSHORT) d[1]; | |
60e61165 | 6285 | #else |
f76b9db2 ILT |
6286 | /* In this case the entire target double is contained in the |
6287 | first array element. The second element of the input is | |
6288 | ignored. */ | |
6289 | s[2] = (unsigned EMUSHORT) (d[0] >> 48); | |
6290 | s[3] = (unsigned EMUSHORT) (d[0] >> 32); | |
60e61165 | 6291 | #endif |
f76b9db2 ILT |
6292 | } |
6293 | else | |
6294 | { | |
6295 | /* Target float words are little-endian. */ | |
6296 | s[0] = (unsigned EMUSHORT) d[0]; | |
6297 | s[1] = (unsigned EMUSHORT) (d[0] >> 16); | |
60e61165 | 6298 | #if HOST_BITS_PER_WIDE_INT == 32 |
f76b9db2 ILT |
6299 | s[2] = (unsigned EMUSHORT) d[1]; |
6300 | s[3] = (unsigned EMUSHORT) (d[1] >> 16); | |
60e61165 | 6301 | #else |
f76b9db2 ILT |
6302 | s[2] = (unsigned EMUSHORT) (d[0] >> 32); |
6303 | s[3] = (unsigned EMUSHORT) (d[0] >> 48); | |
b31c244f | 6304 | #endif |
f76b9db2 | 6305 | } |
0f41302f | 6306 | /* Convert target double to E-type. */ |
b31c244f | 6307 | e53toe (s, e); |
0f41302f | 6308 | /* Output E-type to REAL_VALUE_TYPE. */ |
b31c244f RS |
6309 | PUT_REAL (e, &r); |
6310 | return r; | |
6311 | } | |
842fbaaa JW |
6312 | |
6313 | ||
8468c4a4 | 6314 | #if 0 |
b51ab098 RK |
6315 | /* Convert target computer unsigned 64-bit integer to e-type. |
6316 | The endian-ness of DImode follows the convention for integers, | |
8c35bbc5 | 6317 | so we use WORDS_BIG_ENDIAN here, not REAL_WORDS_BIG_ENDIAN. */ |
842fbaaa | 6318 | |
a0353055 | 6319 | static void |
842fbaaa | 6320 | uditoe (di, e) |
0f41302f | 6321 | unsigned EMUSHORT *di; /* Address of the 64-bit int. */ |
842fbaaa JW |
6322 | unsigned EMUSHORT *e; |
6323 | { | |
6324 | unsigned EMUSHORT yi[NI]; | |
6325 | int k; | |
6326 | ||
6327 | ecleaz (yi); | |
f76b9db2 ILT |
6328 | if (WORDS_BIG_ENDIAN) |
6329 | { | |
6330 | for (k = M; k < M + 4; k++) | |
6331 | yi[k] = *di++; | |
6332 | } | |
6333 | else | |
6334 | { | |
6335 | for (k = M + 3; k >= M; k--) | |
6336 | yi[k] = *di++; | |
6337 | } | |
842fbaaa JW |
6338 | yi[E] = EXONE + 47; /* exponent if normalize shift count were 0 */ |
6339 | if ((k = enormlz (yi)) > NBITS)/* normalize the significand */ | |
6340 | ecleaz (yi); /* it was zero */ | |
6341 | else | |
6342 | yi[E] -= (unsigned EMUSHORT) k;/* subtract shift count from exponent */ | |
6343 | emovo (yi, e); | |
6344 | } | |
6345 | ||
0f41302f | 6346 | /* Convert target computer signed 64-bit integer to e-type. */ |
842fbaaa | 6347 | |
a0353055 | 6348 | static void |
842fbaaa | 6349 | ditoe (di, e) |
0f41302f | 6350 | unsigned EMUSHORT *di; /* Address of the 64-bit int. */ |
842fbaaa JW |
6351 | unsigned EMUSHORT *e; |
6352 | { | |
6353 | unsigned EMULONG acc; | |
6354 | unsigned EMUSHORT yi[NI]; | |
6355 | unsigned EMUSHORT carry; | |
6356 | int k, sign; | |
6357 | ||
6358 | ecleaz (yi); | |
f76b9db2 ILT |
6359 | if (WORDS_BIG_ENDIAN) |
6360 | { | |
6361 | for (k = M; k < M + 4; k++) | |
6362 | yi[k] = *di++; | |
6363 | } | |
6364 | else | |
6365 | { | |
6366 | for (k = M + 3; k >= M; k--) | |
6367 | yi[k] = *di++; | |
6368 | } | |
842fbaaa JW |
6369 | /* Take absolute value */ |
6370 | sign = 0; | |
6371 | if (yi[M] & 0x8000) | |
6372 | { | |
6373 | sign = 1; | |
6374 | carry = 0; | |
6375 | for (k = M + 3; k >= M; k--) | |
6376 | { | |
6377 | acc = (unsigned EMULONG) (~yi[k] & 0xffff) + carry; | |
6378 | yi[k] = acc; | |
6379 | carry = 0; | |
6380 | if (acc & 0x10000) | |
6381 | carry = 1; | |
6382 | } | |
6383 | } | |
6384 | yi[E] = EXONE + 47; /* exponent if normalize shift count were 0 */ | |
6385 | if ((k = enormlz (yi)) > NBITS)/* normalize the significand */ | |
6386 | ecleaz (yi); /* it was zero */ | |
6387 | else | |
6388 | yi[E] -= (unsigned EMUSHORT) k;/* subtract shift count from exponent */ | |
6389 | emovo (yi, e); | |
6390 | if (sign) | |
6391 | eneg (e); | |
6392 | } | |
6393 | ||
6394 | ||
0f41302f | 6395 | /* Convert e-type to unsigned 64-bit int. */ |
842fbaaa | 6396 | |
008f0d36 RK |
6397 | static void |
6398 | etoudi (x, i) | |
842fbaaa JW |
6399 | unsigned EMUSHORT *x; |
6400 | unsigned EMUSHORT *i; | |
6401 | { | |
6402 | unsigned EMUSHORT xi[NI]; | |
6403 | int j, k; | |
6404 | ||
6405 | emovi (x, xi); | |
6406 | if (xi[0]) | |
6407 | { | |
6408 | xi[M] = 0; | |
6409 | goto noshift; | |
6410 | } | |
6411 | k = (int) xi[E] - (EXONE - 1); | |
6412 | if (k <= 0) | |
6413 | { | |
6414 | for (j = 0; j < 4; j++) | |
6415 | *i++ = 0; | |
6416 | return; | |
6417 | } | |
6418 | if (k > 64) | |
6419 | { | |
6420 | for (j = 0; j < 4; j++) | |
6421 | *i++ = 0xffff; | |
6422 | if (extra_warnings) | |
6423 | warning ("overflow on truncation to integer"); | |
6424 | return; | |
6425 | } | |
6426 | if (k > 16) | |
6427 | { | |
6428 | /* Shift more than 16 bits: first shift up k-16 mod 16, | |
6429 | then shift up by 16's. */ | |
6430 | j = k - ((k >> 4) << 4); | |
6431 | if (j == 0) | |
6432 | j = 16; | |
6433 | eshift (xi, j); | |
f76b9db2 ILT |
6434 | if (WORDS_BIG_ENDIAN) |
6435 | *i++ = xi[M]; | |
6436 | else | |
6437 | { | |
6438 | i += 3; | |
6439 | *i-- = xi[M]; | |
6440 | } | |
842fbaaa JW |
6441 | k -= j; |
6442 | do | |
6443 | { | |
6444 | eshup6 (xi); | |
f76b9db2 ILT |
6445 | if (WORDS_BIG_ENDIAN) |
6446 | *i++ = xi[M]; | |
6447 | else | |
6448 | *i-- = xi[M]; | |
842fbaaa JW |
6449 | } |
6450 | while ((k -= 16) > 0); | |
6451 | } | |
6452 | else | |
6453 | { | |
6454 | /* shift not more than 16 bits */ | |
6455 | eshift (xi, k); | |
6456 | ||
6457 | noshift: | |
6458 | ||
f76b9db2 ILT |
6459 | if (WORDS_BIG_ENDIAN) |
6460 | { | |
6461 | i += 3; | |
6462 | *i-- = xi[M]; | |
6463 | *i-- = 0; | |
6464 | *i-- = 0; | |
6465 | *i = 0; | |
6466 | } | |
6467 | else | |
6468 | { | |
6469 | *i++ = xi[M]; | |
6470 | *i++ = 0; | |
6471 | *i++ = 0; | |
6472 | *i = 0; | |
6473 | } | |
842fbaaa JW |
6474 | } |
6475 | } | |
6476 | ||
6477 | ||
0f41302f | 6478 | /* Convert e-type to signed 64-bit int. */ |
842fbaaa | 6479 | |
a0353055 | 6480 | static void |
842fbaaa JW |
6481 | etodi (x, i) |
6482 | unsigned EMUSHORT *x; | |
6483 | unsigned EMUSHORT *i; | |
6484 | { | |
6485 | unsigned EMULONG acc; | |
6486 | unsigned EMUSHORT xi[NI]; | |
6487 | unsigned EMUSHORT carry; | |
6488 | unsigned EMUSHORT *isave; | |
6489 | int j, k; | |
6490 | ||
6491 | emovi (x, xi); | |
6492 | k = (int) xi[E] - (EXONE - 1); | |
6493 | if (k <= 0) | |
6494 | { | |
6495 | for (j = 0; j < 4; j++) | |
6496 | *i++ = 0; | |
6497 | return; | |
6498 | } | |
6499 | if (k > 64) | |
6500 | { | |
6501 | for (j = 0; j < 4; j++) | |
6502 | *i++ = 0xffff; | |
6503 | if (extra_warnings) | |
6504 | warning ("overflow on truncation to integer"); | |
6505 | return; | |
6506 | } | |
6507 | isave = i; | |
6508 | if (k > 16) | |
6509 | { | |
6510 | /* Shift more than 16 bits: first shift up k-16 mod 16, | |
6511 | then shift up by 16's. */ | |
6512 | j = k - ((k >> 4) << 4); | |
6513 | if (j == 0) | |
6514 | j = 16; | |
6515 | eshift (xi, j); | |
f76b9db2 ILT |
6516 | if (WORDS_BIG_ENDIAN) |
6517 | *i++ = xi[M]; | |
6518 | else | |
6519 | { | |
6520 | i += 3; | |
6521 | *i-- = xi[M]; | |
6522 | } | |
842fbaaa JW |
6523 | k -= j; |
6524 | do | |
6525 | { | |
6526 | eshup6 (xi); | |
f76b9db2 ILT |
6527 | if (WORDS_BIG_ENDIAN) |
6528 | *i++ = xi[M]; | |
6529 | else | |
6530 | *i-- = xi[M]; | |
842fbaaa JW |
6531 | } |
6532 | while ((k -= 16) > 0); | |
6533 | } | |
6534 | else | |
6535 | { | |
6536 | /* shift not more than 16 bits */ | |
6537 | eshift (xi, k); | |
6538 | ||
f76b9db2 ILT |
6539 | if (WORDS_BIG_ENDIAN) |
6540 | { | |
6541 | i += 3; | |
6542 | *i = xi[M]; | |
6543 | *i-- = 0; | |
6544 | *i-- = 0; | |
6545 | *i = 0; | |
6546 | } | |
6547 | else | |
6548 | { | |
6549 | *i++ = xi[M]; | |
6550 | *i++ = 0; | |
6551 | *i++ = 0; | |
6552 | *i = 0; | |
6553 | } | |
842fbaaa JW |
6554 | } |
6555 | /* Negate if negative */ | |
6556 | if (xi[0]) | |
6557 | { | |
6558 | carry = 0; | |
f76b9db2 ILT |
6559 | if (WORDS_BIG_ENDIAN) |
6560 | isave += 3; | |
842fbaaa JW |
6561 | for (k = 0; k < 4; k++) |
6562 | { | |
6563 | acc = (unsigned EMULONG) (~(*isave) & 0xffff) + carry; | |
f76b9db2 ILT |
6564 | if (WORDS_BIG_ENDIAN) |
6565 | *isave-- = acc; | |
6566 | else | |
6567 | *isave++ = acc; | |
842fbaaa JW |
6568 | carry = 0; |
6569 | if (acc & 0x10000) | |
6570 | carry = 1; | |
6571 | } | |
6572 | } | |
6573 | } | |
6574 | ||
6575 | ||
0f41302f | 6576 | /* Longhand square root routine. */ |
842fbaaa JW |
6577 | |
6578 | ||
6579 | static int esqinited = 0; | |
6580 | static unsigned short sqrndbit[NI]; | |
6581 | ||
a0353055 | 6582 | static void |
842fbaaa JW |
6583 | esqrt (x, y) |
6584 | unsigned EMUSHORT *x, *y; | |
6585 | { | |
6586 | unsigned EMUSHORT temp[NI], num[NI], sq[NI], xx[NI]; | |
6587 | EMULONG m, exp; | |
6588 | int i, j, k, n, nlups; | |
6589 | ||
6590 | if (esqinited == 0) | |
6591 | { | |
6592 | ecleaz (sqrndbit); | |
6593 | sqrndbit[NI - 2] = 1; | |
6594 | esqinited = 1; | |
6595 | } | |
6596 | /* Check for arg <= 0 */ | |
6597 | i = ecmp (x, ezero); | |
6598 | if (i <= 0) | |
6599 | { | |
29e11dab | 6600 | if (i == -1) |
842fbaaa | 6601 | { |
29e11dab RK |
6602 | mtherr ("esqrt", DOMAIN); |
6603 | eclear (y); | |
842fbaaa | 6604 | } |
29e11dab RK |
6605 | else |
6606 | emov (x, y); | |
842fbaaa JW |
6607 | return; |
6608 | } | |
6609 | ||
6610 | #ifdef INFINITY | |
6611 | if (eisinf (x)) | |
6612 | { | |
6613 | eclear (y); | |
6614 | einfin (y); | |
6615 | return; | |
6616 | } | |
6617 | #endif | |
0f41302f | 6618 | /* Bring in the arg and renormalize if it is denormal. */ |
842fbaaa JW |
6619 | emovi (x, xx); |
6620 | m = (EMULONG) xx[1]; /* local long word exponent */ | |
6621 | if (m == 0) | |
6622 | m -= enormlz (xx); | |
6623 | ||
6624 | /* Divide exponent by 2 */ | |
6625 | m -= 0x3ffe; | |
6626 | exp = (unsigned short) ((m / 2) + 0x3ffe); | |
6627 | ||
6628 | /* Adjust if exponent odd */ | |
6629 | if ((m & 1) != 0) | |
6630 | { | |
6631 | if (m > 0) | |
6632 | exp += 1; | |
6633 | eshdn1 (xx); | |
6634 | } | |
6635 | ||
6636 | ecleaz (sq); | |
6637 | ecleaz (num); | |
6638 | n = 8; /* get 8 bits of result per inner loop */ | |
6639 | nlups = rndprc; | |
6640 | j = 0; | |
6641 | ||
6642 | while (nlups > 0) | |
6643 | { | |
6644 | /* bring in next word of arg */ | |
6645 | if (j < NE) | |
6646 | num[NI - 1] = xx[j + 3]; | |
0f41302f | 6647 | /* Do additional bit on last outer loop, for roundoff. */ |
842fbaaa JW |
6648 | if (nlups <= 8) |
6649 | n = nlups + 1; | |
6650 | for (i = 0; i < n; i++) | |
6651 | { | |
6652 | /* Next 2 bits of arg */ | |
6653 | eshup1 (num); | |
6654 | eshup1 (num); | |
6655 | /* Shift up answer */ | |
6656 | eshup1 (sq); | |
6657 | /* Make trial divisor */ | |
6658 | for (k = 0; k < NI; k++) | |
6659 | temp[k] = sq[k]; | |
6660 | eshup1 (temp); | |
6661 | eaddm (sqrndbit, temp); | |
6662 | /* Subtract and insert answer bit if it goes in */ | |
6663 | if (ecmpm (temp, num) <= 0) | |
6664 | { | |
6665 | esubm (temp, num); | |
6666 | sq[NI - 2] |= 1; | |
6667 | } | |
6668 | } | |
6669 | nlups -= n; | |
6670 | j += 1; | |
6671 | } | |
6672 | ||
0f41302f | 6673 | /* Adjust for extra, roundoff loop done. */ |
842fbaaa JW |
6674 | exp += (NBITS - 1) - rndprc; |
6675 | ||
0f41302f | 6676 | /* Sticky bit = 1 if the remainder is nonzero. */ |
842fbaaa JW |
6677 | k = 0; |
6678 | for (i = 3; i < NI; i++) | |
6679 | k |= (int) num[i]; | |
6680 | ||
0f41302f | 6681 | /* Renormalize and round off. */ |
842fbaaa JW |
6682 | emdnorm (sq, k, 0, exp, 64); |
6683 | emovo (sq, y); | |
6684 | } | |
8468c4a4 | 6685 | #endif |
985b6196 | 6686 | #endif /* EMU_NON_COMPILE not defined */ |
8ddae348 RK |
6687 | \f |
6688 | /* Return the binary precision of the significand for a given | |
6689 | floating point mode. The mode can hold an integer value | |
6690 | that many bits wide, without losing any bits. */ | |
6691 | ||
6692 | int | |
6693 | significand_size (mode) | |
6694 | enum machine_mode mode; | |
6695 | { | |
6696 | ||
de3a68a1 RK |
6697 | /* Don't test the modes, but their sizes, lest this |
6698 | code won't work for BITS_PER_UNIT != 8 . */ | |
6699 | ||
6700 | switch (GET_MODE_BITSIZE (mode)) | |
8ddae348 | 6701 | { |
de3a68a1 | 6702 | case 32: |
f5963e61 JL |
6703 | |
6704 | #if TARGET_FLOAT_FORMAT == C4X_FLOAT_FORMAT | |
6705 | return 56; | |
6706 | #endif | |
6707 | ||
8ddae348 RK |
6708 | return 24; |
6709 | ||
de3a68a1 | 6710 | case 64: |
8ddae348 RK |
6711 | #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT |
6712 | return 53; | |
6713 | #else | |
6714 | #if TARGET_FLOAT_FORMAT == IBM_FLOAT_FORMAT | |
6715 | return 56; | |
6716 | #else | |
6717 | #if TARGET_FLOAT_FORMAT == VAX_FLOAT_FORMAT | |
6718 | return 56; | |
f5963e61 JL |
6719 | #else |
6720 | #if TARGET_FLOAT_FORMAT == C4X_FLOAT_FORMAT | |
6721 | return 56; | |
8ddae348 RK |
6722 | #else |
6723 | abort (); | |
6724 | #endif | |
6725 | #endif | |
f5963e61 | 6726 | #endif |
8ddae348 RK |
6727 | #endif |
6728 | ||
de3a68a1 | 6729 | case 96: |
8ddae348 | 6730 | return 64; |
de3a68a1 | 6731 | case 128: |
8ddae348 RK |
6732 | return 113; |
6733 | ||
6734 | default: | |
6735 | abort (); | |
6736 | } | |
6737 | } |