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TOMOYO Linux Cross Reference
Linux/arch/parisc/math-emu/float.h

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  1 /*
  2  * Linux/PA-RISC Project (http://www.parisc-linux.org/)
  3  *
  4  * Floating-point emulation code
  5  *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
  6  *
  7  *    This program is free software; you can redistribute it and/or modify
  8  *    it under the terms of the GNU General Public License as published by
  9  *    the Free Software Foundation; either version 2, or (at your option)
 10  *    any later version.
 11  *
 12  *    This program is distributed in the hope that it will be useful,
 13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  *    GNU General Public License for more details.
 16  *
 17  *    You should have received a copy of the GNU General Public License
 18  *    along with this program; if not, write to the Free Software
 19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 20  */
 21 /*
 22  * BEGIN_DESC
 23  * 
 24  *  File: 
 25  *      @(#)    pa/spmath/float.h               $Revision: 1.1 $
 26  * 
 27  *  Purpose:
 28  *      <<please update with a synopis of the functionality provided by this file>>
 29  * 
 30  *  BE header:  no
 31  *
 32  *  Shipped:  yes
 33  *      /usr/conf/pa/spmath/float.h
 34  *
 35  * END_DESC  
 36 */
 37 
 38 #ifdef __NO_PA_HDRS
 39     PA header file -- do not include this header file for non-PA builds.
 40 #endif
 41 
 42 #include "fpbits.h"
 43 #include "hppa.h"
 44 /*
 45  * Want to pick up the FPU capability flags, not the PDC structures.
 46  * 'LOCORE' isn't really true in this case, but we don't want the C structures
 47  * so it suits our purposes
 48  */
 49 #define LOCORE
 50 #include "fpu.h"
 51 
 52 /*
 53  * Declare the basic structures for the 3 different
 54  * floating-point precisions.
 55  *        
 56  * Single number  
 57  * +-------+-------+-------+-------+-------+-------+-------+-------+
 58  * |s|       exp     |               mantissa                      |
 59  * +-------+-------+-------+-------+-------+-------+-------+-------+
 60  */
 61 #define Sall(object) (object)
 62 #define Ssign(object) Bitfield_extract( 0,  1,object)
 63 #define Ssignedsign(object) Bitfield_signed_extract( 0,  1,object)
 64 #define Sexponent(object) Bitfield_extract( 1,  8,object)
 65 #define Smantissa(object) Bitfield_mask( 9, 23,object)
 66 #define Ssignaling(object) Bitfield_extract( 9,  1,object)
 67 #define Ssignalingnan(object) Bitfield_extract( 1,  9,object)
 68 #define Shigh2mantissa(object) Bitfield_extract( 9,  2,object)
 69 #define Sexponentmantissa(object) Bitfield_mask( 1, 31,object)
 70 #define Ssignexponent(object) Bitfield_extract( 0,  9,object)
 71 #define Shidden(object) Bitfield_extract( 8,  1,object)
 72 #define Shiddenoverflow(object) Bitfield_extract( 7,  1,object)
 73 #define Shiddenhigh7mantissa(object) Bitfield_extract( 8,  8,object)
 74 #define Shiddenhigh3mantissa(object) Bitfield_extract( 8,  4,object)
 75 #define Slow(object) Bitfield_mask( 31,  1,object)
 76 #define Slow4(object) Bitfield_mask( 28,  4,object)
 77 #define Slow31(object) Bitfield_mask( 1, 31,object)
 78 #define Shigh31(object) Bitfield_extract( 0, 31,object)
 79 #define Ssignedhigh31(object) Bitfield_signed_extract( 0, 31,object)
 80 #define Shigh4(object) Bitfield_extract( 0,  4,object)
 81 #define Sbit24(object) Bitfield_extract( 24,  1,object)
 82 #define Sbit28(object) Bitfield_extract( 28,  1,object)
 83 #define Sbit29(object) Bitfield_extract( 29,  1,object)
 84 #define Sbit30(object) Bitfield_extract( 30,  1,object)
 85 #define Sbit31(object) Bitfield_mask( 31,  1,object)
 86 
 87 #define Deposit_ssign(object,value) Bitfield_deposit(value,0,1,object)
 88 #define Deposit_sexponent(object,value) Bitfield_deposit(value,1,8,object)
 89 #define Deposit_smantissa(object,value) Bitfield_deposit(value,9,23,object)
 90 #define Deposit_shigh2mantissa(object,value) Bitfield_deposit(value,9,2,object)
 91 #define Deposit_sexponentmantissa(object,value) \
 92     Bitfield_deposit(value,1,31,object)
 93 #define Deposit_ssignexponent(object,value) Bitfield_deposit(value,0,9,object)
 94 #define Deposit_slow(object,value) Bitfield_deposit(value,31,1,object)
 95 #define Deposit_shigh4(object,value) Bitfield_deposit(value,0,4,object)
 96 
 97 #define Is_ssign(object) Bitfield_mask( 0,  1,object)
 98 #define Is_ssignaling(object) Bitfield_mask( 9,  1,object)
 99 #define Is_shidden(object) Bitfield_mask( 8,  1,object)
100 #define Is_shiddenoverflow(object) Bitfield_mask( 7,  1,object)
101 #define Is_slow(object) Bitfield_mask( 31,  1,object)
102 #define Is_sbit24(object) Bitfield_mask( 24,  1,object)
103 #define Is_sbit28(object) Bitfield_mask( 28,  1,object)
104 #define Is_sbit29(object) Bitfield_mask( 29,  1,object)
105 #define Is_sbit30(object) Bitfield_mask( 30,  1,object)
106 #define Is_sbit31(object) Bitfield_mask( 31,  1,object)
107 
108 /* 
109  * Double number.
110  * +-------+-------+-------+-------+-------+-------+-------+-------+
111  * |s|       exponent      |          mantissa part 1              |
112  * +-------+-------+-------+-------+-------+-------+-------+-------+
113  *
114  * +-------+-------+-------+-------+-------+-------+-------+-------+
115  * |                    mantissa part 2                            |
116  * +-------+-------+-------+-------+-------+-------+-------+-------+
117  */
118 #define Dallp1(object) (object)
119 #define Dsign(object) Bitfield_extract( 0,  1,object)
120 #define Dsignedsign(object) Bitfield_signed_extract( 0,  1,object)
121 #define Dexponent(object) Bitfield_extract( 1,  11,object)
122 #define Dmantissap1(object) Bitfield_mask( 12, 20,object)
123 #define Dsignaling(object) Bitfield_extract( 12,  1,object)
124 #define Dsignalingnan(object) Bitfield_extract( 1,  12,object)
125 #define Dhigh2mantissa(object) Bitfield_extract( 12,  2,object)
126 #define Dexponentmantissap1(object) Bitfield_mask( 1, 31,object)
127 #define Dsignexponent(object) Bitfield_extract( 0, 12,object)
128 #define Dhidden(object) Bitfield_extract( 11,  1,object)
129 #define Dhiddenoverflow(object) Bitfield_extract( 10,  1,object)
130 #define Dhiddenhigh7mantissa(object) Bitfield_extract( 11,  8,object)
131 #define Dhiddenhigh3mantissa(object) Bitfield_extract( 11,  4,object)
132 #define Dlowp1(object) Bitfield_mask( 31,  1,object)
133 #define Dlow31p1(object) Bitfield_mask( 1, 31,object)
134 #define Dhighp1(object) Bitfield_extract( 0,  1,object)
135 #define Dhigh4p1(object) Bitfield_extract( 0,  4,object)
136 #define Dhigh31p1(object) Bitfield_extract( 0, 31,object)
137 #define Dsignedhigh31p1(object) Bitfield_signed_extract( 0, 31,object)
138 #define Dbit3p1(object) Bitfield_extract( 3,  1,object)
139 
140 #define Deposit_dsign(object,value) Bitfield_deposit(value,0,1,object)
141 #define Deposit_dexponent(object,value) Bitfield_deposit(value,1,11,object)
142 #define Deposit_dmantissap1(object,value) Bitfield_deposit(value,12,20,object)
143 #define Deposit_dhigh2mantissa(object,value) Bitfield_deposit(value,12,2,object)
144 #define Deposit_dexponentmantissap1(object,value) \
145     Bitfield_deposit(value,1,31,object)
146 #define Deposit_dsignexponent(object,value) Bitfield_deposit(value,0,12,object)
147 #define Deposit_dlowp1(object,value) Bitfield_deposit(value,31,1,object)
148 #define Deposit_dhigh4p1(object,value) Bitfield_deposit(value,0,4,object)
149 
150 #define Is_dsign(object) Bitfield_mask( 0,  1,object)
151 #define Is_dsignaling(object) Bitfield_mask( 12,  1,object)
152 #define Is_dhidden(object) Bitfield_mask( 11,  1,object)
153 #define Is_dhiddenoverflow(object) Bitfield_mask( 10,  1,object)
154 #define Is_dlowp1(object) Bitfield_mask( 31,  1,object)
155 #define Is_dhighp1(object) Bitfield_mask( 0,  1,object)
156 #define Is_dbit3p1(object) Bitfield_mask( 3,  1,object)
157 
158 #define Dallp2(object) (object)
159 #define Dmantissap2(object) (object)
160 #define Dlowp2(object) Bitfield_mask( 31,  1,object)
161 #define Dlow4p2(object) Bitfield_mask( 28,  4,object)
162 #define Dlow31p2(object) Bitfield_mask( 1, 31,object)
163 #define Dhighp2(object) Bitfield_extract( 0,  1,object)
164 #define Dhigh31p2(object) Bitfield_extract( 0, 31,object)
165 #define Dbit2p2(object) Bitfield_extract( 2,  1,object)
166 #define Dbit3p2(object) Bitfield_extract( 3,  1,object)
167 #define Dbit21p2(object) Bitfield_extract( 21,  1,object)
168 #define Dbit28p2(object) Bitfield_extract( 28,  1,object)
169 #define Dbit29p2(object) Bitfield_extract( 29,  1,object)
170 #define Dbit30p2(object) Bitfield_extract( 30,  1,object)
171 #define Dbit31p2(object) Bitfield_mask( 31,  1,object)
172 
173 #define Deposit_dlowp2(object,value) Bitfield_deposit(value,31,1,object)
174 
175 #define Is_dlowp2(object) Bitfield_mask( 31,  1,object)
176 #define Is_dhighp2(object) Bitfield_mask( 0,  1,object)
177 #define Is_dbit2p2(object) Bitfield_mask( 2,  1,object)
178 #define Is_dbit3p2(object) Bitfield_mask( 3,  1,object)
179 #define Is_dbit21p2(object) Bitfield_mask( 21,  1,object)
180 #define Is_dbit28p2(object) Bitfield_mask( 28,  1,object)
181 #define Is_dbit29p2(object) Bitfield_mask( 29,  1,object)
182 #define Is_dbit30p2(object) Bitfield_mask( 30,  1,object)
183 #define Is_dbit31p2(object) Bitfield_mask( 31,  1,object)
184 
185 /* 
186  * Quad number.
187  * +-------+-------+-------+-------+-------+-------+-------+-------+
188  * |s|          exponent           |      mantissa part 1          |
189  * +-------+-------+-------+-------+-------+-------+-------+-------+
190  *
191  * +-------+-------+-------+-------+-------+-------+-------+-------+
192  * |                    mantissa part 2                            |
193  * +-------+-------+-------+-------+-------+-------+-------+-------+
194  *
195  * +-------+-------+-------+-------+-------+-------+-------+-------+
196  * |                    mantissa part 3                            |
197  * +-------+-------+-------+-------+-------+-------+-------+-------+
198  *
199  * +-------+-------+-------+-------+-------+-------+-------+-------+
200  * |                    mantissa part 4                            |
201  * +-------+-------+-------+-------+-------+-------+-------+-------+
202  */
203 typedef struct
204     {
205     union
206         {
207         struct { unsigned qallp1; } u_qallp1;
208 /* Not needed for now...
209         Bitfield_extract( 0,  1,u_qsign,qsign)
210         Bitfield_signed_extract( 0,  1,u_qsignedsign,qsignedsign)
211         Bitfield_extract( 1, 15,u_qexponent,qexponent)
212         Bitfield_extract(16, 16,u_qmantissap1,qmantissap1)
213         Bitfield_extract(16,  1,u_qsignaling,qsignaling)
214         Bitfield_extract(1,  16,u_qsignalingnan,qsignalingnan)
215         Bitfield_extract(16,  2,u_qhigh2mantissa,qhigh2mantissa)
216         Bitfield_extract( 1, 31,u_qexponentmantissap1,qexponentmantissap1)
217         Bitfield_extract( 0, 16,u_qsignexponent,qsignexponent)
218         Bitfield_extract(15,  1,u_qhidden,qhidden)
219         Bitfield_extract(14,  1,u_qhiddenoverflow,qhiddenoverflow)
220         Bitfield_extract(15,  8,u_qhiddenhigh7mantissa,qhiddenhigh7mantissa)
221         Bitfield_extract(15,  4,u_qhiddenhigh3mantissa,qhiddenhigh3mantissa)
222         Bitfield_extract(31,  1,u_qlowp1,qlowp1)
223         Bitfield_extract( 1, 31,u_qlow31p1,qlow31p1)
224         Bitfield_extract( 0,  1,u_qhighp1,qhighp1)
225         Bitfield_extract( 0,  4,u_qhigh4p1,qhigh4p1)
226         Bitfield_extract( 0, 31,u_qhigh31p1,qhigh31p1)
227   */
228         } quad_u1;
229     union
230         {
231         struct { unsigned qallp2; } u_qallp2;
232   /* Not needed for now...
233         Bitfield_extract(31,  1,u_qlowp2,qlowp2)
234         Bitfield_extract( 1, 31,u_qlow31p2,qlow31p2)
235         Bitfield_extract( 0,  1,u_qhighp2,qhighp2)
236         Bitfield_extract( 0, 31,u_qhigh31p2,qhigh31p2)
237    */
238         } quad_u2;
239     union
240         {
241         struct { unsigned qallp3; } u_qallp3;
242   /* Not needed for now...
243         Bitfield_extract(31,  1,u_qlowp3,qlowp3)
244         Bitfield_extract( 1, 31,u_qlow31p3,qlow31p3)
245         Bitfield_extract( 0,  1,u_qhighp3,qhighp3)
246         Bitfield_extract( 0, 31,u_qhigh31p3,qhigh31p3)
247    */ 
248         } quad_u3;
249     union
250         {
251         struct { unsigned qallp4; } u_qallp4;
252     /* Not need for now...
253         Bitfield_extract(31,  1,u_qlowp4,qlowp4)
254         Bitfield_extract( 1, 31,u_qlow31p4,qlow31p4)
255         Bitfield_extract( 0,  1,u_qhighp4,qhighp4)
256         Bitfield_extract( 0, 31,u_qhigh31p4,qhigh31p4)
257      */
258         } quad_u4;
259     } quad_floating_point;
260 
261 /* Extension - An additional structure to hold the guard, round and
262  *             sticky bits during computations.
263  */
264 #define Extall(object) (object)
265 #define Extsign(object) Bitfield_extract( 0,  1,object)
266 #define Exthigh31(object) Bitfield_extract( 0, 31,object)
267 #define Extlow31(object) Bitfield_extract( 1, 31,object)
268 #define Extlow(object) Bitfield_extract( 31,  1,object)
269 
270 /*
271  * Single extended - The upper word is just like single precision,
272  *                 but one additional word of mantissa is needed.
273  */
274 #define Sextallp1(object) (object)
275 #define Sextallp2(object) (object)
276 #define Sextlowp1(object) Bitfield_extract( 31,  1,object)
277 #define Sexthighp2(object) Bitfield_extract( 0,  1,object)
278 #define Sextlow31p2(object) Bitfield_extract( 1, 31,object)
279 #define Sexthiddenoverflow(object) Bitfield_extract( 4,  1,object)
280 #define Is_sexthiddenoverflow(object) Bitfield_mask( 4,  1,object)
281 
282 /*
283  * Double extended - The upper two words are just like double precision,
284  *                   but two additional words of mantissa are needed.
285  */
286 #define Dextallp1(object) (object)
287 #define Dextallp2(object) (object)
288 #define Dextallp3(object) (object)
289 #define Dextallp4(object) (object)
290 #define Dextlowp2(object) Bitfield_extract( 31,  1,object)
291 #define Dexthighp3(object) Bitfield_extract( 0,  1,object)
292 #define Dextlow31p3(object) Bitfield_extract( 1, 31,object)
293 #define Dexthiddenoverflow(object) Bitfield_extract( 10,  1,object)
294 #define Is_dexthiddenoverflow(object) Bitfield_mask( 10,  1,object)
295 #define Deposit_dextlowp4(object,value) Bitfield_deposit(value,31,1,object)
296 
297 /*
298  * Declare the basic structures for the 3 different
299  * fixed-point precisions.
300  *        
301  * Single number  
302  * +-------+-------+-------+-------+-------+-------+-------+-------+
303  * |s|                    integer                                  |
304  * +-------+-------+-------+-------+-------+-------+-------+-------+
305  */
306 typedef int sgl_integer;
307 
308 /* 
309  * Double number.
310  * +-------+-------+-------+-------+-------+-------+-------+-------+
311  * |s|                     high integer                            |
312  * +-------+-------+-------+-------+-------+-------+-------+-------+
313  *
314  * +-------+-------+-------+-------+-------+-------+-------+-------+
315  * |                       low integer                             |
316  * +-------+-------+-------+-------+-------+-------+-------+-------+
317  */
318 struct dint {
319         int  wd0;
320         unsigned int wd1;
321 };
322 
323 struct dblwd {
324         unsigned int wd0;
325         unsigned int wd1;
326 };
327 
328 /* 
329  * Quad number.
330  * +-------+-------+-------+-------+-------+-------+-------+-------+
331  * |s|                  integer part1                              |
332  * +-------+-------+-------+-------+-------+-------+-------+-------+
333  *
334  * +-------+-------+-------+-------+-------+-------+-------+-------+
335  * |                    integer part 2                             |
336  * +-------+-------+-------+-------+-------+-------+-------+-------+
337  *
338  * +-------+-------+-------+-------+-------+-------+-------+-------+
339  * |                    integer part 3                             |
340  * +-------+-------+-------+-------+-------+-------+-------+-------+
341  *
342  * +-------+-------+-------+-------+-------+-------+-------+-------+
343  * |                    integer part 4                             |
344  * +-------+-------+-------+-------+-------+-------+-------+-------+
345  */
346 
347 struct quadwd {
348         int  wd0;
349         unsigned int wd1;
350         unsigned int wd2;
351         unsigned int wd3;
352 };
353 
354 typedef struct quadwd quad_integer;
355 
356 
357 /* useful typedefs */
358 typedef unsigned int sgl_floating_point;
359 typedef struct dblwd dbl_floating_point;
360 typedef struct dint dbl_integer;
361 typedef struct dblwd dbl_unsigned;
362 
363 /* 
364  * Define the different precisions' parameters.
365  */
366 #define SGL_BITLENGTH 32
367 #define SGL_EMAX 127
368 #define SGL_EMIN (-126)
369 #define SGL_BIAS 127
370 #define SGL_WRAP 192
371 #define SGL_INFINITY_EXPONENT (SGL_EMAX+SGL_BIAS+1)
372 #define SGL_THRESHOLD 32
373 #define SGL_EXP_LENGTH 8
374 #define SGL_P 24
375 
376 #define DBL_BITLENGTH 64
377 #define DBL_EMAX 1023
378 #define DBL_EMIN (-1022)
379 #define DBL_BIAS 1023
380 #define DBL_WRAP 1536
381 #define DBL_INFINITY_EXPONENT (DBL_EMAX+DBL_BIAS+1)
382 #define DBL_THRESHOLD 64
383 #define DBL_EXP_LENGTH 11
384 #define DBL_P 53
385 
386 #define QUAD_BITLENGTH 128
387 #define QUAD_EMAX 16383
388 #define QUAD_EMIN (-16382)
389 #define QUAD_BIAS 16383
390 #define QUAD_WRAP 24576
391 #define QUAD_INFINITY_EXPONENT (QUAD_EMAX+QUAD_BIAS+1)
392 #define QUAD_P 113
393 
394 /* Boolean Values etc. */
395 #define FALSE 0
396 #define TRUE (!FALSE)
397 #define NOT !
398 #define XOR ^
399 
400 /* other constants */
401 #undef NULL
402 #define NULL 0
403 #define NIL 0
404 #define SGL 0
405 #define DBL 1
406 #define BADFMT 2
407 #define QUAD 3
408 
409 
410 /* Types */
411 typedef int boolean;
412 typedef int FORMAT;
413 typedef int VOID;
414 
415 
416 /* Declare status register equivalent to FPUs architecture.
417  *
418  *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
419  * +-------+-------+-------+-------+-------+-------+-------+-------+
420  * |V|Z|O|U|I|C|  rsv  |  model    | version |RM |rsv|T|r|V|Z|O|U|I|
421  * +-------+-------+-------+-------+-------+-------+-------+-------+
422  */
423 #define Cbit(object) Bitfield_extract( 5, 1,object)
424 #define Tbit(object) Bitfield_extract( 25, 1,object)
425 #define Roundingmode(object) Bitfield_extract( 21, 2,object)
426 #define Invalidtrap(object) Bitfield_extract( 27, 1,object)
427 #define Divisionbyzerotrap(object) Bitfield_extract( 28, 1,object)
428 #define Overflowtrap(object) Bitfield_extract( 29, 1,object)
429 #define Underflowtrap(object) Bitfield_extract( 30, 1,object)
430 #define Inexacttrap(object) Bitfield_extract( 31, 1,object)
431 #define Invalidflag(object) Bitfield_extract( 0, 1,object)
432 #define Divisionbyzeroflag(object) Bitfield_extract( 1, 1,object)
433 #define Overflowflag(object) Bitfield_extract( 2, 1,object)
434 #define Underflowflag(object) Bitfield_extract( 3, 1,object)
435 #define Inexactflag(object) Bitfield_extract( 4, 1,object)
436 #define Allflags(object) Bitfield_extract( 0, 5,object)
437 
438 /* Definitions relevant to the status register */
439 
440 /* Rounding Modes */
441 #define ROUNDNEAREST 0
442 #define ROUNDZERO    1
443 #define ROUNDPLUS    2
444 #define ROUNDMINUS   3
445 
446 /* Exceptions */
447 #define NOEXCEPTION             0x0
448 #define INVALIDEXCEPTION        0x20
449 #define DIVISIONBYZEROEXCEPTION 0x10
450 #define OVERFLOWEXCEPTION       0x08
451 #define UNDERFLOWEXCEPTION      0x04
452 #define INEXACTEXCEPTION        0x02
453 #define UNIMPLEMENTEDEXCEPTION  0x01
454 
455 /* New exceptions for the 2E Opcode */
456 #define OPC_2E_INVALIDEXCEPTION     0x30
457 #define OPC_2E_OVERFLOWEXCEPTION    0x18
458 #define OPC_2E_UNDERFLOWEXCEPTION   0x0c
459 #define OPC_2E_INEXACTEXCEPTION     0x12
460 
461 /* Declare exception registers equivalent to FPUs architecture 
462  *
463  *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
464  * +-------+-------+-------+-------+-------+-------+-------+-------+
465  * |excepttype |  r1     | r2/ext  |  operation  |parm |n| t/cond  |
466  * +-------+-------+-------+-------+-------+-------+-------+-------+
467  */
468 #define Allexception(object) (object)
469 #define Exceptiontype(object) Bitfield_extract( 0, 6,object)
470 #define Instructionfield(object) Bitfield_mask( 6,26,object)
471 #define Parmfield(object) Bitfield_extract( 23, 3,object)
472 #define Rabit(object) Bitfield_extract( 24, 1,object)
473 #define Ibit(object) Bitfield_extract( 25, 1,object)
474 
475 #define Set_exceptiontype(object,value) Bitfield_deposit(value, 0, 6,object)
476 #define Set_parmfield(object,value) Bitfield_deposit(value, 23, 3,object)
477 #define Set_exceptiontype_and_instr_field(exception,instruction,object) \
478     object = exception << 26 | instruction
479 
480 /* Declare the condition field
481  *
482  *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
483  * +-------+-------+-------+-------+-------+-------+-------+-------+
484  * |                                                     |G|L|E|U|X|
485  * +-------+-------+-------+-------+-------+-------+-------+-------+
486  */
487 #define Greaterthanbit(object) Bitfield_extract( 27, 1,object)
488 #define Lessthanbit(object) Bitfield_extract( 28, 1,object)
489 #define Equalbit(object) Bitfield_extract( 29, 1,object)
490 #define Unorderedbit(object) Bitfield_extract( 30, 1,object)
491 #define Exceptionbit(object) Bitfield_extract( 31, 1,object)
492 
493 /* An alias name for the status register */
494 #define Fpustatus_register (*status)
495 
496 /**************************************************
497  * Status register referencing and manipulation.  *
498  **************************************************/
499 
500 /* Rounding mode */
501 #define Rounding_mode()  Roundingmode(Fpustatus_register)
502 #define Is_rounding_mode(rmode) \
503     (Roundingmode(Fpustatus_register) == rmode)
504 #define Set_rounding_mode(value) \
505     Bitfield_deposit(value,21,2,Fpustatus_register)
506 
507 /* Boolean testing of the trap enable bits */
508 #define Is_invalidtrap_enabled() Invalidtrap(Fpustatus_register)
509 #define Is_divisionbyzerotrap_enabled() Divisionbyzerotrap(Fpustatus_register)
510 #define Is_overflowtrap_enabled() Overflowtrap(Fpustatus_register)
511 #define Is_underflowtrap_enabled() Underflowtrap(Fpustatus_register)
512 #define Is_inexacttrap_enabled() Inexacttrap(Fpustatus_register)
513 
514 /* Set the indicated flags in the status register */
515 #define Set_invalidflag() Bitfield_deposit(1,0,1,Fpustatus_register)
516 #define Set_divisionbyzeroflag() Bitfield_deposit(1,1,1,Fpustatus_register)
517 #define Set_overflowflag() Bitfield_deposit(1,2,1,Fpustatus_register)
518 #define Set_underflowflag() Bitfield_deposit(1,3,1,Fpustatus_register)
519 #define Set_inexactflag() Bitfield_deposit(1,4,1,Fpustatus_register)
520 
521 #define Clear_all_flags() Bitfield_deposit(0,0,5,Fpustatus_register)
522 
523 /* Manipulate the trap and condition code bits (tbit and cbit) */
524 #define Set_tbit() Bitfield_deposit(1,25,1,Fpustatus_register)
525 #define Clear_tbit() Bitfield_deposit(0,25,1,Fpustatus_register)
526 #define Is_tbit_set() Tbit(Fpustatus_register)
527 #define Is_cbit_set() Cbit(Fpustatus_register)
528 
529 #define Set_status_cbit(value)  \
530         Bitfield_deposit(value,5,1,Fpustatus_register)
531 
532 /*******************************
533  * Condition field referencing *
534  *******************************/
535 #define Unordered(cond) Unorderedbit(cond)
536 #define Equal(cond) Equalbit(cond)
537 #define Lessthan(cond) Lessthanbit(cond)
538 #define Greaterthan(cond) Greaterthanbit(cond)
539 #define Exception(cond) Exceptionbit(cond)
540 
541 
542 /* Defines for the extension */
543 #define Ext_isone_sign(extent) (Extsign(extent))
544 #define Ext_isnotzero(extent) \
545     (Extall(extent))
546 #define Ext_isnotzero_lower(extent) \
547     (Extlow31(extent))
548 #define Ext_leftshiftby1(extent) \
549     Extall(extent) <<= 1
550 #define Ext_negate(extent) \
551     (int )Extall(extent) = 0 - (int )Extall(extent)
552 #define Ext_setone_low(extent) Bitfield_deposit(1,31,1,extent)
553 #define Ext_setzero(extent) Extall(extent) = 0
554 
555 typedef int operation;
556 
557 /* error messages */
558 
559 #define         NONE            0
560 #define         UNDEFFPINST     1
561 
562 /* Function definitions: opcode, opclass */
563 #define FTEST   (1<<2) | 0
564 #define FCPY    (2<<2) | 0
565 #define FABS    (3<<2) | 0
566 #define FSQRT   (4<<2) | 0
567 #define FRND    (5<<2) | 0
568 
569 #define FCNVFF  (0<<2) | 1
570 #define FCNVXF  (1<<2) | 1
571 #define FCNVFX  (2<<2) | 1
572 #define FCNVFXT (3<<2) | 1
573 
574 #define FCMP    (0<<2) | 2
575 
576 #define FADD    (0<<2) | 3
577 #define FSUB    (1<<2) | 3
578 #define FMPY    (2<<2) | 3
579 #define FDIV    (3<<2) | 3
580 #define FREM    (4<<2) | 3
581 
582 

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