1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Linux/PA-RISC Project (http://www.parisc-linux.org/)
4  *
5  * Floating-point emulation code
6  *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
7  */
8 /*
9  * BEGIN_DESC
10  *
11  *  File:
12  *      @(#)	pa/spmath/float.h		$Revision: 1.1 $
13  *
14  *  Purpose:
15  *      <<please update with a synopis of the functionality provided by this file>>
16  *
17  *  BE header:  no
18  *
19  *  Shipped:  yes
20  *	/usr/conf/pa/spmath/float.h
21  *
22  * END_DESC
23 */
24 
25 #ifdef __NO_PA_HDRS
26     PA header file -- do not include this header file for non-PA builds.
27 #endif
28 
29 #include "fpbits.h"
30 #include "hppa.h"
31 /*
32  * Want to pick up the FPU capability flags, not the PDC structures.
33  * 'LOCORE' isn't really true in this case, but we don't want the C structures
34  * so it suits our purposes
35  */
36 #define LOCORE
37 #include "fpu.h"
38 
39 /*
40  * Declare the basic structures for the 3 different
41  * floating-point precisions.
42  *
43  * Single number
44  * +-------+-------+-------+-------+-------+-------+-------+-------+
45  * |s|       exp     |               mantissa                      |
46  * +-------+-------+-------+-------+-------+-------+-------+-------+
47  */
48 #define	Sall(object) (object)
49 #define	Ssign(object) Bitfield_extract( 0,  1,object)
50 #define	Ssignedsign(object) Bitfield_signed_extract( 0,  1,object)
51 #define	Sexponent(object) Bitfield_extract( 1,  8,object)
52 #define	Smantissa(object) Bitfield_mask( 9, 23,object)
53 #define	Ssignaling(object) Bitfield_extract( 9,  1,object)
54 #define	Ssignalingnan(object) Bitfield_extract( 1,  9,object)
55 #define	Shigh2mantissa(object) Bitfield_extract( 9,  2,object)
56 #define	Sexponentmantissa(object) Bitfield_mask( 1, 31,object)
57 #define	Ssignexponent(object) Bitfield_extract( 0,  9,object)
58 #define	Shidden(object) Bitfield_extract( 8,  1,object)
59 #define	Shiddenoverflow(object) Bitfield_extract( 7,  1,object)
60 #define	Shiddenhigh7mantissa(object) Bitfield_extract( 8,  8,object)
61 #define	Shiddenhigh3mantissa(object) Bitfield_extract( 8,  4,object)
62 #define	Slow(object) Bitfield_mask( 31,  1,object)
63 #define	Slow4(object) Bitfield_mask( 28,  4,object)
64 #define	Slow31(object) Bitfield_mask( 1, 31,object)
65 #define	Shigh31(object) Bitfield_extract( 0, 31,object)
66 #define	Ssignedhigh31(object) Bitfield_signed_extract( 0, 31,object)
67 #define	Shigh4(object) Bitfield_extract( 0,  4,object)
68 #define	Sbit24(object) Bitfield_extract( 24,  1,object)
69 #define	Sbit28(object) Bitfield_extract( 28,  1,object)
70 #define	Sbit29(object) Bitfield_extract( 29,  1,object)
71 #define	Sbit30(object) Bitfield_extract( 30,  1,object)
72 #define	Sbit31(object) Bitfield_mask( 31,  1,object)
73 
74 #define Deposit_ssign(object,value) Bitfield_deposit(value,0,1,object)
75 #define Deposit_sexponent(object,value) Bitfield_deposit(value,1,8,object)
76 #define Deposit_smantissa(object,value) Bitfield_deposit(value,9,23,object)
77 #define Deposit_shigh2mantissa(object,value) Bitfield_deposit(value,9,2,object)
78 #define Deposit_sexponentmantissa(object,value) \
79     Bitfield_deposit(value,1,31,object)
80 #define Deposit_ssignexponent(object,value) Bitfield_deposit(value,0,9,object)
81 #define Deposit_slow(object,value) Bitfield_deposit(value,31,1,object)
82 #define Deposit_shigh4(object,value) Bitfield_deposit(value,0,4,object)
83 
84 #define	Is_ssign(object) Bitfield_mask( 0,  1,object)
85 #define	Is_ssignaling(object) Bitfield_mask( 9,  1,object)
86 #define	Is_shidden(object) Bitfield_mask( 8,  1,object)
87 #define	Is_shiddenoverflow(object) Bitfield_mask( 7,  1,object)
88 #define	Is_slow(object) Bitfield_mask( 31,  1,object)
89 #define	Is_sbit24(object) Bitfield_mask( 24,  1,object)
90 #define	Is_sbit28(object) Bitfield_mask( 28,  1,object)
91 #define	Is_sbit29(object) Bitfield_mask( 29,  1,object)
92 #define	Is_sbit30(object) Bitfield_mask( 30,  1,object)
93 #define	Is_sbit31(object) Bitfield_mask( 31,  1,object)
94 
95 /*
96  * Double number.
97  * +-------+-------+-------+-------+-------+-------+-------+-------+
98  * |s|       exponent      |          mantissa part 1              |
99  * +-------+-------+-------+-------+-------+-------+-------+-------+
100  *
101  * +-------+-------+-------+-------+-------+-------+-------+-------+
102  * |                    mantissa part 2                            |
103  * +-------+-------+-------+-------+-------+-------+-------+-------+
104  */
105 #define Dallp1(object) (object)
106 #define Dsign(object) Bitfield_extract( 0,  1,object)
107 #define Dsignedsign(object) Bitfield_signed_extract( 0,  1,object)
108 #define Dexponent(object) Bitfield_extract( 1,  11,object)
109 #define Dmantissap1(object) Bitfield_mask( 12, 20,object)
110 #define Dsignaling(object) Bitfield_extract( 12,  1,object)
111 #define Dsignalingnan(object) Bitfield_extract( 1,  12,object)
112 #define Dhigh2mantissa(object) Bitfield_extract( 12,  2,object)
113 #define Dexponentmantissap1(object) Bitfield_mask( 1, 31,object)
114 #define Dsignexponent(object) Bitfield_extract( 0, 12,object)
115 #define Dhidden(object) Bitfield_extract( 11,  1,object)
116 #define Dhiddenoverflow(object) Bitfield_extract( 10,  1,object)
117 #define Dhiddenhigh7mantissa(object) Bitfield_extract( 11,  8,object)
118 #define Dhiddenhigh3mantissa(object) Bitfield_extract( 11,  4,object)
119 #define Dlowp1(object) Bitfield_mask( 31,  1,object)
120 #define Dlow31p1(object) Bitfield_mask( 1, 31,object)
121 #define Dhighp1(object) Bitfield_extract( 0,  1,object)
122 #define Dhigh4p1(object) Bitfield_extract( 0,  4,object)
123 #define Dhigh31p1(object) Bitfield_extract( 0, 31,object)
124 #define Dsignedhigh31p1(object) Bitfield_signed_extract( 0, 31,object)
125 #define Dbit3p1(object) Bitfield_extract( 3,  1,object)
126 
127 #define Deposit_dsign(object,value) Bitfield_deposit(value,0,1,object)
128 #define Deposit_dexponent(object,value) Bitfield_deposit(value,1,11,object)
129 #define Deposit_dmantissap1(object,value) Bitfield_deposit(value,12,20,object)
130 #define Deposit_dhigh2mantissa(object,value) Bitfield_deposit(value,12,2,object)
131 #define Deposit_dexponentmantissap1(object,value) \
132     Bitfield_deposit(value,1,31,object)
133 #define Deposit_dsignexponent(object,value) Bitfield_deposit(value,0,12,object)
134 #define Deposit_dlowp1(object,value) Bitfield_deposit(value,31,1,object)
135 #define Deposit_dhigh4p1(object,value) Bitfield_deposit(value,0,4,object)
136 
137 #define Is_dsign(object) Bitfield_mask( 0,  1,object)
138 #define Is_dsignaling(object) Bitfield_mask( 12,  1,object)
139 #define Is_dhidden(object) Bitfield_mask( 11,  1,object)
140 #define Is_dhiddenoverflow(object) Bitfield_mask( 10,  1,object)
141 #define Is_dlowp1(object) Bitfield_mask( 31,  1,object)
142 #define Is_dhighp1(object) Bitfield_mask( 0,  1,object)
143 #define Is_dbit3p1(object) Bitfield_mask( 3,  1,object)
144 
145 #define Dallp2(object) (object)
146 #define Dmantissap2(object) (object)
147 #define Dlowp2(object) Bitfield_mask( 31,  1,object)
148 #define Dlow4p2(object) Bitfield_mask( 28,  4,object)
149 #define Dlow31p2(object) Bitfield_mask( 1, 31,object)
150 #define Dhighp2(object) Bitfield_extract( 0,  1,object)
151 #define Dhigh31p2(object) Bitfield_extract( 0, 31,object)
152 #define Dbit2p2(object) Bitfield_extract( 2,  1,object)
153 #define Dbit3p2(object) Bitfield_extract( 3,  1,object)
154 #define Dbit21p2(object) Bitfield_extract( 21,  1,object)
155 #define Dbit28p2(object) Bitfield_extract( 28,  1,object)
156 #define Dbit29p2(object) Bitfield_extract( 29,  1,object)
157 #define Dbit30p2(object) Bitfield_extract( 30,  1,object)
158 #define Dbit31p2(object) Bitfield_mask( 31,  1,object)
159 
160 #define Deposit_dlowp2(object,value) Bitfield_deposit(value,31,1,object)
161 
162 #define Is_dlowp2(object) Bitfield_mask( 31,  1,object)
163 #define Is_dhighp2(object) Bitfield_mask( 0,  1,object)
164 #define Is_dbit2p2(object) Bitfield_mask( 2,  1,object)
165 #define Is_dbit3p2(object) Bitfield_mask( 3,  1,object)
166 #define Is_dbit21p2(object) Bitfield_mask( 21,  1,object)
167 #define Is_dbit28p2(object) Bitfield_mask( 28,  1,object)
168 #define Is_dbit29p2(object) Bitfield_mask( 29,  1,object)
169 #define Is_dbit30p2(object) Bitfield_mask( 30,  1,object)
170 #define Is_dbit31p2(object) Bitfield_mask( 31,  1,object)
171 
172 /*
173  * Quad number.
174  * +-------+-------+-------+-------+-------+-------+-------+-------+
175  * |s|          exponent           |      mantissa part 1          |
176  * +-------+-------+-------+-------+-------+-------+-------+-------+
177  *
178  * +-------+-------+-------+-------+-------+-------+-------+-------+
179  * |                    mantissa part 2                            |
180  * +-------+-------+-------+-------+-------+-------+-------+-------+
181  *
182  * +-------+-------+-------+-------+-------+-------+-------+-------+
183  * |                    mantissa part 3                            |
184  * +-------+-------+-------+-------+-------+-------+-------+-------+
185  *
186  * +-------+-------+-------+-------+-------+-------+-------+-------+
187  * |                    mantissa part 4                            |
188  * +-------+-------+-------+-------+-------+-------+-------+-------+
189  */
190 typedef struct
191     {
192     union
193 	{
194 	struct { unsigned qallp1; } u_qallp1;
195 /* Not needed for now...
196 	Bitfield_extract( 0,  1,u_qsign,qsign)
197 	Bitfield_signed_extract( 0,  1,u_qsignedsign,qsignedsign)
198 	Bitfield_extract( 1, 15,u_qexponent,qexponent)
199 	Bitfield_extract(16, 16,u_qmantissap1,qmantissap1)
200 	Bitfield_extract(16,  1,u_qsignaling,qsignaling)
201 	Bitfield_extract(1,  16,u_qsignalingnan,qsignalingnan)
202 	Bitfield_extract(16,  2,u_qhigh2mantissa,qhigh2mantissa)
203 	Bitfield_extract( 1, 31,u_qexponentmantissap1,qexponentmantissap1)
204 	Bitfield_extract( 0, 16,u_qsignexponent,qsignexponent)
205 	Bitfield_extract(15,  1,u_qhidden,qhidden)
206 	Bitfield_extract(14,  1,u_qhiddenoverflow,qhiddenoverflow)
207 	Bitfield_extract(15,  8,u_qhiddenhigh7mantissa,qhiddenhigh7mantissa)
208 	Bitfield_extract(15,  4,u_qhiddenhigh3mantissa,qhiddenhigh3mantissa)
209 	Bitfield_extract(31,  1,u_qlowp1,qlowp1)
210 	Bitfield_extract( 1, 31,u_qlow31p1,qlow31p1)
211 	Bitfield_extract( 0,  1,u_qhighp1,qhighp1)
212 	Bitfield_extract( 0,  4,u_qhigh4p1,qhigh4p1)
213 	Bitfield_extract( 0, 31,u_qhigh31p1,qhigh31p1)
214   */
215 	} quad_u1;
216     union
217 	{
218 	struct { unsigned qallp2; } u_qallp2;
219   /* Not needed for now...
220 	Bitfield_extract(31,  1,u_qlowp2,qlowp2)
221 	Bitfield_extract( 1, 31,u_qlow31p2,qlow31p2)
222 	Bitfield_extract( 0,  1,u_qhighp2,qhighp2)
223 	Bitfield_extract( 0, 31,u_qhigh31p2,qhigh31p2)
224    */
225 	} quad_u2;
226     union
227 	{
228 	struct { unsigned qallp3; } u_qallp3;
229   /* Not needed for now...
230 	Bitfield_extract(31,  1,u_qlowp3,qlowp3)
231 	Bitfield_extract( 1, 31,u_qlow31p3,qlow31p3)
232 	Bitfield_extract( 0,  1,u_qhighp3,qhighp3)
233 	Bitfield_extract( 0, 31,u_qhigh31p3,qhigh31p3)
234    */
235 	} quad_u3;
236     union
237 	{
238 	struct { unsigned qallp4; } u_qallp4;
239     /* Not need for now...
240 	Bitfield_extract(31,  1,u_qlowp4,qlowp4)
241 	Bitfield_extract( 1, 31,u_qlow31p4,qlow31p4)
242 	Bitfield_extract( 0,  1,u_qhighp4,qhighp4)
243 	Bitfield_extract( 0, 31,u_qhigh31p4,qhigh31p4)
244      */
245 	} quad_u4;
246     } quad_floating_point;
247 
248 /* Extension - An additional structure to hold the guard, round and
249  *             sticky bits during computations.
250  */
251 #define Extall(object) (object)
252 #define Extsign(object) Bitfield_extract( 0,  1,object)
253 #define Exthigh31(object) Bitfield_extract( 0, 31,object)
254 #define Extlow31(object) Bitfield_extract( 1, 31,object)
255 #define Extlow(object) Bitfield_extract( 31,  1,object)
256 
257 /*
258  * Single extended - The upper word is just like single precision,
259  *                 but one additional word of mantissa is needed.
260  */
261 #define Sextallp1(object) (object)
262 #define Sextallp2(object) (object)
263 #define Sextlowp1(object) Bitfield_extract( 31,  1,object)
264 #define Sexthighp2(object) Bitfield_extract( 0,  1,object)
265 #define Sextlow31p2(object) Bitfield_extract( 1, 31,object)
266 #define Sexthiddenoverflow(object) Bitfield_extract( 4,  1,object)
267 #define Is_sexthiddenoverflow(object) Bitfield_mask( 4,  1,object)
268 
269 /*
270  * Double extended - The upper two words are just like double precision,
271  *		     but two additional words of mantissa are needed.
272  */
273 #define Dextallp1(object) (object)
274 #define Dextallp2(object) (object)
275 #define Dextallp3(object) (object)
276 #define Dextallp4(object) (object)
277 #define Dextlowp2(object) Bitfield_extract( 31,  1,object)
278 #define Dexthighp3(object) Bitfield_extract( 0,  1,object)
279 #define Dextlow31p3(object) Bitfield_extract( 1, 31,object)
280 #define Dexthiddenoverflow(object) Bitfield_extract( 10,  1,object)
281 #define Is_dexthiddenoverflow(object) Bitfield_mask( 10,  1,object)
282 #define Deposit_dextlowp4(object,value) Bitfield_deposit(value,31,1,object)
283 
284 /*
285  * Declare the basic structures for the 3 different
286  * fixed-point precisions.
287  *
288  * Single number
289  * +-------+-------+-------+-------+-------+-------+-------+-------+
290  * |s|                    integer                                  |
291  * +-------+-------+-------+-------+-------+-------+-------+-------+
292  */
293 typedef int sgl_integer;
294 
295 /*
296  * Double number.
297  * +-------+-------+-------+-------+-------+-------+-------+-------+
298  * |s|                     high integer                            |
299  * +-------+-------+-------+-------+-------+-------+-------+-------+
300  *
301  * +-------+-------+-------+-------+-------+-------+-------+-------+
302  * |                       low integer                             |
303  * +-------+-------+-------+-------+-------+-------+-------+-------+
304  */
305 struct dint {
306         int  wd0;
307         unsigned int wd1;
308 };
309 
310 struct dblwd {
311         unsigned int wd0;
312         unsigned int wd1;
313 };
314 
315 /*
316  * Quad number.
317  * +-------+-------+-------+-------+-------+-------+-------+-------+
318  * |s|                  integer part1                              |
319  * +-------+-------+-------+-------+-------+-------+-------+-------+
320  *
321  * +-------+-------+-------+-------+-------+-------+-------+-------+
322  * |                    integer part 2                             |
323  * +-------+-------+-------+-------+-------+-------+-------+-------+
324  *
325  * +-------+-------+-------+-------+-------+-------+-------+-------+
326  * |                    integer part 3                             |
327  * +-------+-------+-------+-------+-------+-------+-------+-------+
328  *
329  * +-------+-------+-------+-------+-------+-------+-------+-------+
330  * |                    integer part 4                             |
331  * +-------+-------+-------+-------+-------+-------+-------+-------+
332  */
333 
334 struct quadwd {
335         int  wd0;
336         unsigned int wd1;
337         unsigned int wd2;
338         unsigned int wd3;
339 };
340 
341 typedef struct quadwd quad_integer;
342 
343 
344 /* useful typedefs */
345 typedef unsigned int sgl_floating_point;
346 typedef struct dblwd dbl_floating_point;
347 typedef struct dint dbl_integer;
348 typedef struct dblwd dbl_unsigned;
349 
350 /*
351  * Define the different precisions' parameters.
352  */
353 #define SGL_BITLENGTH 32
354 #define SGL_EMAX 127
355 #define SGL_EMIN (-126)
356 #define SGL_BIAS 127
357 #define SGL_WRAP 192
358 #define SGL_INFINITY_EXPONENT (SGL_EMAX+SGL_BIAS+1)
359 #define SGL_THRESHOLD 32
360 #define SGL_EXP_LENGTH 8
361 #define SGL_P 24
362 
363 #define DBL_BITLENGTH 64
364 #define DBL_EMAX 1023
365 #define DBL_EMIN (-1022)
366 #define DBL_BIAS 1023
367 #define DBL_WRAP 1536
368 #define DBL_INFINITY_EXPONENT (DBL_EMAX+DBL_BIAS+1)
369 #define DBL_THRESHOLD 64
370 #define DBL_EXP_LENGTH 11
371 #define DBL_P 53
372 
373 #define QUAD_BITLENGTH 128
374 #define QUAD_EMAX 16383
375 #define QUAD_EMIN (-16382)
376 #define QUAD_BIAS 16383
377 #define QUAD_WRAP 24576
378 #define QUAD_INFINITY_EXPONENT (QUAD_EMAX+QUAD_BIAS+1)
379 #define QUAD_P 113
380 
381 /* Boolean Values etc. */
382 #define FALSE 0
383 #define TRUE (!FALSE)
384 #define NOT !
385 #define XOR ^
386 
387 /* other constants */
388 #undef NULL
389 #define NULL 0
390 #define NIL 0
391 #define SGL 0
392 #define DBL 1
393 #define BADFMT 2
394 #define QUAD 3
395 
396 
397 /* Types */
398 typedef int boolean;
399 typedef int FORMAT;
400 typedef int VOID;
401 
402 
403 /* Declare status register equivalent to FPUs architecture.
404  *
405  *  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
406  * +-------+-------+-------+-------+-------+-------+-------+-------+
407  * |V|Z|O|U|I|C|  rsv  |  model    | version |RM |rsv|T|r|V|Z|O|U|I|
408  * +-------+-------+-------+-------+-------+-------+-------+-------+
409  */
410 #define Cbit(object) Bitfield_extract( 5, 1,object)
411 #define Tbit(object) Bitfield_extract( 25, 1,object)
412 #define Roundingmode(object) Bitfield_extract( 21, 2,object)
413 #define Invalidtrap(object) Bitfield_extract( 27, 1,object)
414 #define Divisionbyzerotrap(object) Bitfield_extract( 28, 1,object)
415 #define Overflowtrap(object) Bitfield_extract( 29, 1,object)
416 #define Underflowtrap(object) Bitfield_extract( 30, 1,object)
417 #define Inexacttrap(object) Bitfield_extract( 31, 1,object)
418 #define Invalidflag(object) Bitfield_extract( 0, 1,object)
419 #define Divisionbyzeroflag(object) Bitfield_extract( 1, 1,object)
420 #define Overflowflag(object) Bitfield_extract( 2, 1,object)
421 #define Underflowflag(object) Bitfield_extract( 3, 1,object)
422 #define Inexactflag(object) Bitfield_extract( 4, 1,object)
423 #define Allflags(object) Bitfield_extract( 0, 5,object)
424 
425 /* Definitions relevant to the status register */
426 
427 /* Rounding Modes */
428 #define ROUNDNEAREST 0
429 #define ROUNDZERO    1
430 #define ROUNDPLUS    2
431 #define ROUNDMINUS   3
432 
433 /* Exceptions */
434 #define NOEXCEPTION		0x0
435 #define INVALIDEXCEPTION	0x20
436 #define DIVISIONBYZEROEXCEPTION	0x10
437 #define OVERFLOWEXCEPTION	0x08
438 #define UNDERFLOWEXCEPTION	0x04
439 #define INEXACTEXCEPTION	0x02
440 #define UNIMPLEMENTEDEXCEPTION	0x01
441 
442 /* New exceptions for the 2E Opcode */
443 #define OPC_2E_INVALIDEXCEPTION     0x30
444 #define OPC_2E_OVERFLOWEXCEPTION    0x18
445 #define OPC_2E_UNDERFLOWEXCEPTION   0x0c
446 #define OPC_2E_INEXACTEXCEPTION     0x12
447 
448 /* Declare exception registers equivalent to FPUs architecture
449  *
450  *  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
451  * +-------+-------+-------+-------+-------+-------+-------+-------+
452  * |excepttype |  r1     | r2/ext  |  operation  |parm |n| t/cond  |
453  * +-------+-------+-------+-------+-------+-------+-------+-------+
454  */
455 #define Allexception(object) (object)
456 #define Exceptiontype(object) Bitfield_extract( 0, 6,object)
457 #define Instructionfield(object) Bitfield_mask( 6,26,object)
458 #define Parmfield(object) Bitfield_extract( 23, 3,object)
459 #define Rabit(object) Bitfield_extract( 24, 1,object)
460 #define Ibit(object) Bitfield_extract( 25, 1,object)
461 
462 #define Set_exceptiontype(object,value) Bitfield_deposit(value, 0, 6,object)
463 #define Set_parmfield(object,value) Bitfield_deposit(value, 23, 3,object)
464 #define Set_exceptiontype_and_instr_field(exception,instruction,object) \
465     object = exception << 26 | instruction
466 
467 /* Declare the condition field
468  *
469  *  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
470  * +-------+-------+-------+-------+-------+-------+-------+-------+
471  * |                                                     |G|L|E|U|X|
472  * +-------+-------+-------+-------+-------+-------+-------+-------+
473  */
474 #define Greaterthanbit(object) Bitfield_extract( 27, 1,object)
475 #define Lessthanbit(object) Bitfield_extract( 28, 1,object)
476 #define Equalbit(object) Bitfield_extract( 29, 1,object)
477 #define Unorderedbit(object) Bitfield_extract( 30, 1,object)
478 #define Exceptionbit(object) Bitfield_extract( 31, 1,object)
479 
480 /* An alias name for the status register */
481 #define Fpustatus_register (*status)
482 
483 /**************************************************
484  * Status register referencing and manipulation.  *
485  **************************************************/
486 
487 /* Rounding mode */
488 #define Rounding_mode()  Roundingmode(Fpustatus_register)
489 #define Is_rounding_mode(rmode) \
490     (Roundingmode(Fpustatus_register) == rmode)
491 #define Set_rounding_mode(value) \
492     Bitfield_deposit(value,21,2,Fpustatus_register)
493 
494 /* Boolean testing of the trap enable bits */
495 #define Is_invalidtrap_enabled() Invalidtrap(Fpustatus_register)
496 #define Is_divisionbyzerotrap_enabled() Divisionbyzerotrap(Fpustatus_register)
497 #define Is_overflowtrap_enabled() Overflowtrap(Fpustatus_register)
498 #define Is_underflowtrap_enabled() Underflowtrap(Fpustatus_register)
499 #define Is_inexacttrap_enabled() Inexacttrap(Fpustatus_register)
500 
501 /* Set the indicated flags in the status register */
502 #define Set_invalidflag() Bitfield_deposit(1,0,1,Fpustatus_register)
503 #define Set_divisionbyzeroflag() Bitfield_deposit(1,1,1,Fpustatus_register)
504 #define Set_overflowflag() Bitfield_deposit(1,2,1,Fpustatus_register)
505 #define Set_underflowflag() Bitfield_deposit(1,3,1,Fpustatus_register)
506 #define Set_inexactflag() Bitfield_deposit(1,4,1,Fpustatus_register)
507 
508 #define Clear_all_flags() Bitfield_deposit(0,0,5,Fpustatus_register)
509 
510 /* Manipulate the trap and condition code bits (tbit and cbit) */
511 #define Set_tbit() Bitfield_deposit(1,25,1,Fpustatus_register)
512 #define Clear_tbit() Bitfield_deposit(0,25,1,Fpustatus_register)
513 #define Is_tbit_set() Tbit(Fpustatus_register)
514 #define Is_cbit_set() Cbit(Fpustatus_register)
515 
516 #define Set_status_cbit(value)  \
517         Bitfield_deposit(value,5,1,Fpustatus_register)
518 
519 /*******************************
520  * Condition field referencing *
521  *******************************/
522 #define Unordered(cond) Unorderedbit(cond)
523 #define Equal(cond) Equalbit(cond)
524 #define Lessthan(cond) Lessthanbit(cond)
525 #define Greaterthan(cond) Greaterthanbit(cond)
526 #define Exception(cond) Exceptionbit(cond)
527 
528 
529 /* Defines for the extension */
530 #define Ext_isone_sign(extent) (Extsign(extent))
531 #define Ext_isnotzero(extent) \
532     (Extall(extent))
533 #define Ext_isnotzero_lower(extent) \
534     (Extlow31(extent))
535 #define Ext_leftshiftby1(extent) \
536     Extall(extent) <<= 1
537 #define Ext_negate(extent) \
538     (int )Extall(extent) = 0 - (int )Extall(extent)
539 #define Ext_setone_low(extent) Bitfield_deposit(1,31,1,extent)
540 #define Ext_setzero(extent) Extall(extent) = 0
541 
542 typedef int operation;
543 
544 /* error messages */
545 
546 #define		NONE		0
547 #define		UNDEFFPINST	1
548 
549 /* Function definitions: opcode, opclass */
550 #define FTEST	(1<<2) | 0
551 #define FCPY	(2<<2) | 0
552 #define FABS	(3<<2) | 0
553 #define FSQRT   (4<<2) | 0
554 #define FRND    (5<<2) | 0
555 
556 #define FCNVFF	(0<<2) | 1
557 #define FCNVXF	(1<<2) | 1
558 #define FCNVFX	(2<<2) | 1
559 #define FCNVFXT	(3<<2) | 1
560 
561 #define FCMP    (0<<2) | 2
562 
563 #define FADD	(0<<2) | 3
564 #define FSUB	(1<<2) | 3
565 #define FMPY	(2<<2) | 3
566 #define FDIV	(3<<2) | 3
567 #define FREM	(4<<2) | 3
568 
569