xref: /openbmc/linux/arch/parisc/math-emu/float.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
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