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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 | /* * Linux/PA-RISC Project (http://www.parisc-linux.org/) * * Floating-point emulation code * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifdef __NO_PA_HDRS PA header file -- do not include this header file for non-PA builds. #endif /* * Some more constants */ #define SGL_FX_MAX_EXP 30 #define DBL_FX_MAX_EXP 62 #define QUAD_FX_MAX_EXP 126 #define Dintp1(object) (object) #define Dintp2(object) (object) #define Duintp1(object) (object) #define Duintp2(object) (object) #define Qintp0(object) (object) #define Qintp1(object) (object) #define Qintp2(object) (object) #define Qintp3(object) (object) /* * These macros will be used specifically by the convert instructions. * * * Single format macros */ #define Sgl_to_dbl_exponent(src_exponent,dest) \ Deposit_dexponent(dest,src_exponent+(DBL_BIAS-SGL_BIAS)) #define Sgl_to_dbl_mantissa(src_mantissa,destA,destB) \ Deposit_dmantissap1(destA,src_mantissa>>3); \ Dmantissap2(destB) = src_mantissa << 29 #define Sgl_isinexact_to_fix(sgl_value,exponent) \ ((exponent < (SGL_P - 1)) ? \ (Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) : FALSE) #define Int_isinexact_to_sgl(int_value) (int_value << 33 - SGL_EXP_LENGTH) #define Sgl_roundnearest_from_int(int_value,sgl_value) \ if (int_value & 1<<(SGL_EXP_LENGTH - 2)) /* round bit */ \ if ((int_value << 34 - SGL_EXP_LENGTH) || Slow(sgl_value)) \ Sall(sgl_value)++ #define Dint_isinexact_to_sgl(dint_valueA,dint_valueB) \ ((Dintp1(dint_valueA) << 33 - SGL_EXP_LENGTH) || Dintp2(dint_valueB)) #define Sgl_roundnearest_from_dint(dint_valueA,dint_valueB,sgl_value) \ if (Dintp1(dint_valueA) & 1<<(SGL_EXP_LENGTH - 2)) \ if ((Dintp1(dint_valueA) << 34 - SGL_EXP_LENGTH) || \ Dintp2(dint_valueB) || Slow(sgl_value)) Sall(sgl_value)++ #define Dint_isinexact_to_dbl(dint_value) \ (Dintp2(dint_value) << 33 - DBL_EXP_LENGTH) #define Dbl_roundnearest_from_dint(dint_opndB,dbl_opndA,dbl_opndB) \ if (Dintp2(dint_opndB) & 1<<(DBL_EXP_LENGTH - 2)) \ if ((Dintp2(dint_opndB) << 34 - DBL_EXP_LENGTH) || Dlowp2(dbl_opndB)) \ if ((++Dallp2(dbl_opndB))==0) Dallp1(dbl_opndA)++ #define Sgl_isone_roundbit(sgl_value,exponent) \ ((Sall(sgl_value) << (SGL_EXP_LENGTH + 1 + exponent)) >> 31) #define Sgl_isone_stickybit(sgl_value,exponent) \ (exponent < (SGL_P - 2) ? \ Sall(sgl_value) << (SGL_EXP_LENGTH + 2 + exponent) : FALSE) /* * Double format macros */ #define Dbl_to_sgl_exponent(src_exponent,dest) \ dest = src_exponent + (SGL_BIAS - DBL_BIAS) #define Dbl_to_sgl_mantissa(srcA,srcB,dest,inexact,guard,sticky,odd) \ Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \ guard = Dbit3p2(srcB); \ sticky = Dallp2(srcB)<<4; \ inexact = guard | sticky; \ odd = Dbit2p2(srcB) #define Dbl_to_sgl_denormalized(srcA,srcB,exp,dest,inexact,guard,sticky,odd,tiny) \ Deposit_dexponent(srcA,1); \ tiny = TRUE; \ if (exp >= -2) { \ if (exp == 0) { \ inexact = Dallp2(srcB) << 3; \ guard = inexact >> 31; \ sticky = inexact << 1; \ Shiftdouble(Dmantissap1(srcA),Dmantissap2(srcB),29,dest); \ odd = dest << 31; \ if (inexact) { \ switch(Rounding_mode()) { \ case ROUNDPLUS: \ if (Dbl_iszero_sign(srcA)) { \ dest++; \ if (Sgl_isone_hidden(dest)) \ tiny = FALSE; \ dest--; \ } \ break; \ case ROUNDMINUS: \ if (Dbl_isone_sign(srcA)) { \ dest++; \ if (Sgl_isone_hidden(dest)) \ tiny = FALSE; \ dest--; \ } \ break; \ case ROUNDNEAREST: \ if (guard && (sticky || odd)) { \ dest++; \ if (Sgl_isone_hidden(dest)) \ tiny = FALSE; \ dest--; \ } \ break; \ } \ } \ /* shift right by one to get correct result */ \ guard = odd; \ sticky = inexact; \ inexact |= guard; \ dest >>= 1; \ Deposit_dsign(srcA,0); \ Shiftdouble(Dallp1(srcA),Dallp2(srcB),30,dest); \ odd = dest << 31; \ } \ else { \ inexact = Dallp2(srcB) << (2 + exp); \ guard = inexact >> 31; \ sticky = inexact << 1; \ Deposit_dsign(srcA,0); \ if (exp == -2) dest = Dallp1(srcA); \ else Variable_shift_double(Dallp1(srcA),Dallp2(srcB),30-exp,dest); \ odd = dest << 31; \ } \ } \ else { \ Deposit_dsign(srcA,0); \ if (exp > (1 - SGL_P)) { \ dest = Dallp1(srcA) >> (- 2 - exp); \ inexact = Dallp1(srcA) << (34 + exp); \ guard = inexact >> 31; \ sticky = (inexact << 1) | Dallp2(srcB); \ inexact |= Dallp2(srcB); \ odd = dest << 31; \ } \ else { \ dest = 0; \ inexact = Dallp1(srcA) | Dallp2(srcB); \ if (exp == (1 - SGL_P)) { \ guard = Dhidden(srcA); \ sticky = Dmantissap1(srcA) | Dallp2(srcB); \ } \ else { \ guard = 0; \ sticky = inexact; \ } \ odd = 0; \ } \ } \ exp = 0 #define Dbl_isinexact_to_fix(dbl_valueA,dbl_valueB,exponent) \ (exponent < (DBL_P-33) ? \ Dallp2(dbl_valueB) || Dallp1(dbl_valueA) << (DBL_EXP_LENGTH+1+exponent) : \ (exponent < (DBL_P-1) ? Dallp2(dbl_valueB) << (exponent + (33-DBL_P)) : \ FALSE)) #define Dbl_isoverflow_to_int(exponent,dbl_valueA,dbl_valueB) \ ((exponent > SGL_FX_MAX_EXP + 1) || Dsign(dbl_valueA)==0 || \ Dmantissap1(dbl_valueA)!=0 || (Dallp2(dbl_valueB)>>21)!=0 ) #define Dbl_isone_roundbit(dbl_valueA,dbl_valueB,exponent) \ ((exponent < (DBL_P - 33) ? \ Dallp1(dbl_valueA) >> ((30 - DBL_EXP_LENGTH) - exponent) : \ Dallp2(dbl_valueB) >> ((DBL_P - 2) - exponent)) & 1) #define Dbl_isone_stickybit(dbl_valueA,dbl_valueB,exponent) \ (exponent < (DBL_P-34) ? \ (Dallp2(dbl_valueB) || Dallp1(dbl_valueA)<<(DBL_EXP_LENGTH+2+exponent)) : \ (exponent<(DBL_P-2) ? (Dallp2(dbl_valueB) << (exponent + (34-DBL_P))) : \ FALSE)) /* Int macros */ #define Int_from_sgl_mantissa(sgl_value,exponent) \ Sall(sgl_value) = \ (unsigned)(Sall(sgl_value) << SGL_EXP_LENGTH)>>(31 - exponent) #define Int_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent) \ Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),22,Dallp1(dbl_valueA)); \ if (exponent < 31) Dallp1(dbl_valueA) >>= 30 - exponent; \ else Dallp1(dbl_valueA) <<= 1 #define Int_negate(int_value) int_value = -int_value /* Dint macros */ #define Dint_from_sgl_mantissa(sgl_value,exponent,dresultA,dresultB) \ {Sall(sgl_value) <<= SGL_EXP_LENGTH; /* left-justify */ \ if (exponent <= 31) { \ Dintp1(dresultA) = 0; \ Dintp2(dresultB) = (unsigned)Sall(sgl_value) >> (31 - exponent); \ } \ else { \ Dintp1(dresultA) = Sall(sgl_value) >> (63 - exponent); \ Dintp2(dresultB) = Sall(sgl_value) << (exponent - 31); \ }} #define Dint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) \ {if (exponent < 32) { \ Dintp1(destA) = 0; \ if (exponent <= 20) \ Dintp2(destB) = Dallp1(dbl_valueA) >> 20-exponent; \ else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \ 52-exponent,Dintp2(destB)); \ } \ else { \ if (exponent <= 52) { \ Dintp1(destA) = Dallp1(dbl_valueA) >> 52-exponent; \ if (exponent == 52) Dintp2(destB) = Dallp2(dbl_valueB); \ else Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \ 52-exponent,Dintp2(destB)); \ } \ else { \ Variable_shift_double(Dallp1(dbl_valueA),Dallp2(dbl_valueB), \ 84-exponent,Dintp1(destA)); \ Dintp2(destB) = Dallp2(dbl_valueB) << exponent-52; \ } \ }} #define Dint_setzero(dresultA,dresultB) \ Dintp1(dresultA) = 0; \ Dintp2(dresultB) = 0 #define Dint_setone_sign(dresultA,dresultB) \ Dintp1(dresultA) = ~Dintp1(dresultA); \ if ((Dintp2(dresultB) = -Dintp2(dresultB)) == 0) Dintp1(dresultA)++ #define Dint_set_minint(dresultA,dresultB) \ Dintp1(dresultA) = (unsigned int)1<<31; \ Dintp2(dresultB) = 0 #define Dint_isone_lowp2(dresultB) (Dintp2(dresultB) & 01) #define Dint_increment(dresultA,dresultB) \ if ((++Dintp2(dresultB))==0) Dintp1(dresultA)++ #define Dint_decrement(dresultA,dresultB) \ if ((Dintp2(dresultB)--)==0) Dintp1(dresultA)-- #define Dint_negate(dresultA,dresultB) \ Dintp1(dresultA) = ~Dintp1(dresultA); \ if ((Dintp2(dresultB) = -Dintp2(dresultB))==0) Dintp1(dresultA)++ #define Dint_copyfromptr(src,destA,destB) \ Dintp1(destA) = src->wd0; \ Dintp2(destB) = src->wd1 #define Dint_copytoptr(srcA,srcB,dest) \ dest->wd0 = Dintp1(srcA); \ dest->wd1 = Dintp2(srcB) /* other macros */ #define Find_ms_one_bit(value, position) \ { \ int var; \ for (var=8; var >=1; var >>= 1) { \ if (value >> 32 - position) \ position -= var; \ else position += var; \ } \ if ((value >> 32 - position) == 0) \ position--; \ else position -= 2; \ } /* * Unsigned int macros */ #define Duint_copyfromptr(src,destA,destB) \ Dint_copyfromptr(src,destA,destB) #define Duint_copytoptr(srcA,srcB,dest) \ Dint_copytoptr(srcA,srcB,dest) #define Suint_isinexact_to_sgl(int_value) \ (int_value << 32 - SGL_EXP_LENGTH) #define Sgl_roundnearest_from_suint(suint_value,sgl_value) \ if (suint_value & 1<<(SGL_EXP_LENGTH - 1)) /* round bit */ \ if ((suint_value << 33 - SGL_EXP_LENGTH) || Slow(sgl_value)) \ Sall(sgl_value)++ #define Duint_isinexact_to_sgl(duint_valueA,duint_valueB) \ ((Duintp1(duint_valueA) << 32 - SGL_EXP_LENGTH) || Duintp2(duint_valueB)) #define Sgl_roundnearest_from_duint(duint_valueA,duint_valueB,sgl_value) \ if (Duintp1(duint_valueA) & 1<<(SGL_EXP_LENGTH - 1)) \ if ((Duintp1(duint_valueA) << 33 - SGL_EXP_LENGTH) || \ Duintp2(duint_valueB) || Slow(sgl_value)) Sall(sgl_value)++ #define Duint_isinexact_to_dbl(duint_value) \ (Duintp2(duint_value) << 32 - DBL_EXP_LENGTH) #define Dbl_roundnearest_from_duint(duint_opndB,dbl_opndA,dbl_opndB) \ if (Duintp2(duint_opndB) & 1<<(DBL_EXP_LENGTH - 1)) \ if ((Duintp2(duint_opndB) << 33 - DBL_EXP_LENGTH) || Dlowp2(dbl_opndB)) \ if ((++Dallp2(dbl_opndB))==0) Dallp1(dbl_opndA)++ #define Suint_from_sgl_mantissa(src,exponent,result) \ Sall(result) = (unsigned)(Sall(src) << SGL_EXP_LENGTH)>>(31 - exponent) #define Sgl_isinexact_to_unsigned(sgl_value,exponent) \ Sgl_isinexact_to_fix(sgl_value,exponent) #define Duint_from_sgl_mantissa(sgl_value,exponent,dresultA,dresultB) \ {Sall(sgl_value) <<= SGL_EXP_LENGTH; /* left-justify */ \ if (exponent <= 31) { \ Dintp1(dresultA) = 0; \ Dintp2(dresultB) = (unsigned)Sall(sgl_value) >> (31 - exponent); \ } \ else { \ Dintp1(dresultA) = Sall(sgl_value) >> (63 - exponent); \ Dintp2(dresultB) = Sall(sgl_value) << (exponent - 31); \ } \ Sall(sgl_value) >>= SGL_EXP_LENGTH; /* return to original */ \ } #define Duint_setzero(dresultA,dresultB) \ Dint_setzero(dresultA,dresultB) #define Duint_increment(dresultA,dresultB) Dint_increment(dresultA,dresultB) #define Duint_isone_lowp2(dresultB) Dint_isone_lowp2(dresultB) #define Suint_from_dbl_mantissa(srcA,srcB,exponent,dest) \ Shiftdouble(Dallp1(srcA),Dallp2(srcB),21,dest); \ dest = (unsigned)dest >> 31 - exponent #define Dbl_isinexact_to_unsigned(dbl_valueA,dbl_valueB,exponent) \ Dbl_isinexact_to_fix(dbl_valueA,dbl_valueB,exponent) #define Duint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) \ Dint_from_dbl_mantissa(dbl_valueA,dbl_valueB,exponent,destA,destB) |