root/arch/parisc/math-emu/float.h

INCLUDED FROM

   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