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#ifdef __NO_PA_HDRS 23 PA header file -- do not include this header file for non-PA builds. 24#endif 25 26/* 32-bit word grabbing functions */ 27#define Sgl_firstword(value) Sall(value) 28#define Sgl_secondword(value) dummy_location 29#define Sgl_thirdword(value) dummy_location 30#define Sgl_fourthword(value) dummy_location 31 32#define Sgl_sign(object) Ssign(object) 33#define Sgl_exponent(object) Sexponent(object) 34#define Sgl_signexponent(object) Ssignexponent(object) 35#define Sgl_mantissa(object) Smantissa(object) 36#define Sgl_exponentmantissa(object) Sexponentmantissa(object) 37#define Sgl_all(object) Sall(object) 38 39/* sgl_and_signs ANDs the sign bits of each argument and puts the result 40 * into the first argument. sgl_or_signs ors those same sign bits */ 41#define Sgl_and_signs( src1dst, src2) \ 42 Sall(src1dst) = (Sall(src2)|~((unsigned int)1<<31)) & Sall(src1dst) 43#define Sgl_or_signs( src1dst, src2) \ 44 Sall(src1dst) = (Sall(src2)&((unsigned int)1<<31)) | Sall(src1dst) 45 46/* The hidden bit is always the low bit of the exponent */ 47#define Sgl_clear_exponent_set_hidden(srcdst) Deposit_sexponent(srcdst,1) 48#define Sgl_clear_signexponent_set_hidden(srcdst) \ 49 Deposit_ssignexponent(srcdst,1) 50#define Sgl_clear_sign(srcdst) Sall(srcdst) &= ~((unsigned int)1<<31) 51#define Sgl_clear_signexponent(srcdst) Sall(srcdst) &= 0x007fffff 52 53/* varamount must be less than 32 for the next three functions */ 54#define Sgl_rightshift(srcdst, varamount) \ 55 Sall(srcdst) >>= varamount 56#define Sgl_leftshift(srcdst, varamount) \ 57 Sall(srcdst) <<= varamount 58#define Sgl_rightshift_exponentmantissa(srcdst, varamount) \ 59 Sall(srcdst) = \ 60 (Sexponentmantissa(srcdst) >> varamount) | \ 61 (Sall(srcdst) & ((unsigned int)1<<31)) 62 63#define Sgl_leftshiftby1_withextent(left,right,result) \ 64 Shiftdouble(Sall(left),Extall(right),31,Sall(result)) 65 66#define Sgl_rightshiftby1_withextent(left,right,dst) \ 67 Shiftdouble(Sall(left),Extall(right),1,Extall(right)) 68#define Sgl_arithrightshiftby1(srcdst) \ 69 Sall(srcdst) = (int)Sall(srcdst) >> 1 70 71/* Sign extend the sign bit with an integer destination */ 72#define Sgl_signextendedsign(value) Ssignedsign(value) 73 74#define Sgl_isone_hidden(sgl_value) (Shidden(sgl_value)) 75#define Sgl_increment(sgl_value) Sall(sgl_value) += 1 76#define Sgl_increment_mantissa(sgl_value) \ 77 Deposit_smantissa(sgl_value,sgl_value+1) 78#define Sgl_decrement(sgl_value) Sall(sgl_value) -= 1 79 80#define Sgl_isone_sign(sgl_value) (Is_ssign(sgl_value)!=0) 81#define Sgl_isone_hiddenoverflow(sgl_value) \ 82 (Is_shiddenoverflow(sgl_value)!=0) 83#define Sgl_isone_lowmantissa(sgl_value) (Is_slow(sgl_value)!=0) 84#define Sgl_isone_signaling(sgl_value) (Is_ssignaling(sgl_value)!=0) 85#define Sgl_is_signalingnan(sgl_value) (Ssignalingnan(sgl_value)==0x1ff) 86#define Sgl_isnotzero(sgl_value) (Sall(sgl_value)!=0) 87#define Sgl_isnotzero_hiddenhigh7mantissa(sgl_value) \ 88 (Shiddenhigh7mantissa(sgl_value)!=0) 89#define Sgl_isnotzero_low4(sgl_value) (Slow4(sgl_value)!=0) 90#define Sgl_isnotzero_exponent(sgl_value) (Sexponent(sgl_value)!=0) 91#define Sgl_isnotzero_mantissa(sgl_value) (Smantissa(sgl_value)!=0) 92#define Sgl_isnotzero_exponentmantissa(sgl_value) \ 93 (Sexponentmantissa(sgl_value)!=0) 94#define Sgl_iszero(sgl_value) (Sall(sgl_value)==0) 95#define Sgl_iszero_signaling(sgl_value) (Is_ssignaling(sgl_value)==0) 96#define Sgl_iszero_hidden(sgl_value) (Is_shidden(sgl_value)==0) 97#define Sgl_iszero_hiddenoverflow(sgl_value) \ 98 (Is_shiddenoverflow(sgl_value)==0) 99#define Sgl_iszero_hiddenhigh3mantissa(sgl_value) \ 100 (Shiddenhigh3mantissa(sgl_value)==0) 101#define Sgl_iszero_hiddenhigh7mantissa(sgl_value) \ 102 (Shiddenhigh7mantissa(sgl_value)==0) 103#define Sgl_iszero_sign(sgl_value) (Is_ssign(sgl_value)==0) 104#define Sgl_iszero_exponent(sgl_value) (Sexponent(sgl_value)==0) 105#define Sgl_iszero_mantissa(sgl_value) (Smantissa(sgl_value)==0) 106#define Sgl_iszero_exponentmantissa(sgl_value) \ 107 (Sexponentmantissa(sgl_value)==0) 108#define Sgl_isinfinity_exponent(sgl_value) \ 109 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT) 110#define Sgl_isnotinfinity_exponent(sgl_value) \ 111 (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT) 112#define Sgl_isinfinity(sgl_value) \ 113 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \ 114 Sgl_mantissa(sgl_value)==0) 115#define Sgl_isnan(sgl_value) \ 116 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \ 117 Sgl_mantissa(sgl_value)!=0) 118#define Sgl_isnotnan(sgl_value) \ 119 (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT || \ 120 Sgl_mantissa(sgl_value)==0) 121#define Sgl_islessthan(sgl_op1,sgl_op2) \ 122 (Sall(sgl_op1) < Sall(sgl_op2)) 123#define Sgl_isgreaterthan(sgl_op1,sgl_op2) \ 124 (Sall(sgl_op1) > Sall(sgl_op2)) 125#define Sgl_isnotlessthan(sgl_op1,sgl_op2) \ 126 (Sall(sgl_op1) >= Sall(sgl_op2)) 127#define Sgl_isequal(sgl_op1,sgl_op2) \ 128 (Sall(sgl_op1) == Sall(sgl_op2)) 129 130#define Sgl_leftshiftby8(sgl_value) \ 131 Sall(sgl_value) <<= 8 132#define Sgl_leftshiftby4(sgl_value) \ 133 Sall(sgl_value) <<= 4 134#define Sgl_leftshiftby3(sgl_value) \ 135 Sall(sgl_value) <<= 3 136#define Sgl_leftshiftby2(sgl_value) \ 137 Sall(sgl_value) <<= 2 138#define Sgl_leftshiftby1(sgl_value) \ 139 Sall(sgl_value) <<= 1 140#define Sgl_rightshiftby1(sgl_value) \ 141 Sall(sgl_value) >>= 1 142#define Sgl_rightshiftby4(sgl_value) \ 143 Sall(sgl_value) >>= 4 144#define Sgl_rightshiftby8(sgl_value) \ 145 Sall(sgl_value) >>= 8 146 147#define Sgl_ismagnitudeless(signlessleft,signlessright) \ 148/* unsigned int signlessleft, signlessright; */ \ 149 (signlessleft < signlessright) 150 151 152#define Sgl_copytoint_exponentmantissa(source,dest) \ 153 dest = Sexponentmantissa(source) 154 155/* A quiet NaN has the high mantissa bit clear and at least on other (in this 156 * case the adjacent bit) bit set. */ 157#define Sgl_set_quiet(sgl_value) Deposit_shigh2mantissa(sgl_value,1) 158#define Sgl_set_exponent(sgl_value,exp) Deposit_sexponent(sgl_value,exp) 159 160#define Sgl_set_mantissa(dest,value) Deposit_smantissa(dest,value) 161#define Sgl_set_exponentmantissa(dest,value) \ 162 Deposit_sexponentmantissa(dest,value) 163 164/* An infinity is represented with the max exponent and a zero mantissa */ 165#define Sgl_setinfinity_exponent(sgl_value) \ 166 Deposit_sexponent(sgl_value,SGL_INFINITY_EXPONENT) 167#define Sgl_setinfinity_exponentmantissa(sgl_value) \ 168 Deposit_sexponentmantissa(sgl_value, \ 169 (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH)))) 170#define Sgl_setinfinitypositive(sgl_value) \ 171 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) 172#define Sgl_setinfinitynegative(sgl_value) \ 173 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) \ 174 | ((unsigned int)1<<31) 175#define Sgl_setinfinity(sgl_value,sign) \ 176 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) | \ 177 ((unsigned int)sign << 31) 178#define Sgl_sethigh4bits(sgl_value, extsign) \ 179 Deposit_shigh4(sgl_value,extsign) 180#define Sgl_set_sign(sgl_value,sign) Deposit_ssign(sgl_value,sign) 181#define Sgl_invert_sign(sgl_value) \ 182 Deposit_ssign(sgl_value,~Ssign(sgl_value)) 183#define Sgl_setone_sign(sgl_value) Deposit_ssign(sgl_value,1) 184#define Sgl_setone_lowmantissa(sgl_value) Deposit_slow(sgl_value,1) 185#define Sgl_setzero_sign(sgl_value) Sall(sgl_value) &= 0x7fffffff 186#define Sgl_setzero_exponent(sgl_value) Sall(sgl_value) &= 0x807fffff 187#define Sgl_setzero_mantissa(sgl_value) Sall(sgl_value) &= 0xff800000 188#define Sgl_setzero_exponentmantissa(sgl_value) Sall(sgl_value) &= 0x80000000 189#define Sgl_setzero(sgl_value) Sall(sgl_value) = 0 190#define Sgl_setnegativezero(sgl_value) Sall(sgl_value) = (unsigned int)1 << 31 191 192/* Use following macro for both overflow & underflow conditions */ 193#define ovfl - 194#define unfl + 195#define Sgl_setwrapped_exponent(sgl_value,exponent,op) \ 196 Deposit_sexponent(sgl_value,(exponent op SGL_WRAP)) 197 198#define Sgl_setlargestpositive(sgl_value) \ 199 Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \ 200 | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 ) 201#define Sgl_setlargestnegative(sgl_value) \ 202 Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \ 203 | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 ) \ 204 | ((unsigned int)1<<31) 205 206#define Sgl_setnegativeinfinity(sgl_value) \ 207 Sall(sgl_value) = \ 208 ((1<<SGL_EXP_LENGTH) | SGL_INFINITY_EXPONENT) << (32-(1+SGL_EXP_LENGTH)) 209#define Sgl_setlargest(sgl_value,sign) \ 210 Sall(sgl_value) = (unsigned int)sign << 31 | \ 211 (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \ 212 | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 )) 213#define Sgl_setlargest_exponentmantissa(sgl_value) \ 214 Sall(sgl_value) = Sall(sgl_value) & ((unsigned int)1<<31) | \ 215 (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \ 216 | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 )) 217 218/* The high bit is always zero so arithmetic or logical shifts will work. */ 219#define Sgl_right_align(srcdst,shift,extent) \ 220 /* sgl_floating_point srcdst; int shift; extension extent */ \ 221 if (shift < 32) { \ 222 Extall(extent) = Sall(srcdst) << (32-(shift)); \ 223 Sall(srcdst) >>= shift; \ 224 } \ 225 else { \ 226 Extall(extent) = Sall(srcdst); \ 227 Sall(srcdst) = 0; \ 228 } 229#define Sgl_hiddenhigh3mantissa(sgl_value) Shiddenhigh3mantissa(sgl_value) 230#define Sgl_hidden(sgl_value) Shidden(sgl_value) 231#define Sgl_lowmantissa(sgl_value) Slow(sgl_value) 232 233/* The left argument is never smaller than the right argument */ 234#define Sgl_subtract(sgl_left,sgl_right,sgl_result) \ 235 Sall(sgl_result) = Sall(sgl_left) - Sall(sgl_right) 236 237/* Subtract right augmented with extension from left augmented with zeros and 238 * store into result and extension. */ 239#define Sgl_subtract_withextension(left,right,extent,result) \ 240 /* sgl_floating_point left,right,result; extension extent */ \ 241 Sgl_subtract(left,right,result); \ 242 if((Extall(extent) = 0-Extall(extent))) \ 243 Sall(result) = Sall(result)-1 244 245#define Sgl_addition(sgl_left,sgl_right,sgl_result) \ 246 Sall(sgl_result) = Sall(sgl_left) + Sall(sgl_right) 247 248#define Sgl_xortointp1(left,right,result) \ 249 result = Sall(left) XOR Sall(right); 250 251#define Sgl_xorfromintp1(left,right,result) \ 252 Sall(result) = left XOR Sall(right) 253 254/* Need to Initialize */ 255#define Sgl_makequietnan(dest) \ 256 Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \ 257 | (1<<(32-(1+SGL_EXP_LENGTH+2))) 258#define Sgl_makesignalingnan(dest) \ 259 Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \ 260 | (1<<(32-(1+SGL_EXP_LENGTH+1))) 261 262#define Sgl_normalize(sgl_opnd,exponent) \ 263 while(Sgl_iszero_hiddenhigh7mantissa(sgl_opnd)) { \ 264 Sgl_leftshiftby8(sgl_opnd); \ 265 exponent -= 8; \ 266 } \ 267 if(Sgl_iszero_hiddenhigh3mantissa(sgl_opnd)) { \ 268 Sgl_leftshiftby4(sgl_opnd); \ 269 exponent -= 4; \ 270 } \ 271 while(Sgl_iszero_hidden(sgl_opnd)) { \ 272 Sgl_leftshiftby1(sgl_opnd); \ 273 exponent -= 1; \ 274 } 275 276#define Sgl_setoverflow(sgl_opnd) \ 277 /* set result to infinity or largest number */ \ 278 switch (Rounding_mode()) { \ 279 case ROUNDPLUS: \ 280 if (Sgl_isone_sign(sgl_opnd)) { \ 281 Sgl_setlargestnegative(sgl_opnd); \ 282 } \ 283 else { \ 284 Sgl_setinfinitypositive(sgl_opnd); \ 285 } \ 286 break; \ 287 case ROUNDMINUS: \ 288 if (Sgl_iszero_sign(sgl_opnd)) { \ 289 Sgl_setlargestpositive(sgl_opnd); \ 290 } \ 291 else { \ 292 Sgl_setinfinitynegative(sgl_opnd); \ 293 } \ 294 break; \ 295 case ROUNDNEAREST: \ 296 Sgl_setinfinity_exponentmantissa(sgl_opnd); \ 297 break; \ 298 case ROUNDZERO: \ 299 Sgl_setlargest_exponentmantissa(sgl_opnd); \ 300 } 301 302#define Sgl_denormalize(opnd,exponent,guard,sticky,inexact) \ 303 Sgl_clear_signexponent_set_hidden(opnd); \ 304 if (exponent >= (1 - SGL_P)) { \ 305 guard = (Sall(opnd) >> -exponent) & 1; \ 306 if (exponent < 0) sticky |= Sall(opnd) << (32+exponent); \ 307 inexact = guard | sticky; \ 308 Sall(opnd) >>= (1-exponent); \ 309 } \ 310 else { \ 311 guard = 0; \ 312 sticky |= Sall(opnd); \ 313 inexact = sticky; \ 314 Sgl_setzero(opnd); \ 315 } 316 317/* 318 * The fused multiply add instructions requires a single extended format, 319 * with 48 bits of mantissa. 320 */ 321#define SGLEXT_THRESHOLD 48 322 323#define Sglext_setzero(valA,valB) \ 324 Sextallp1(valA) = 0; Sextallp2(valB) = 0 325 326#define Sglext_isnotzero_mantissap2(valB) (Sextallp2(valB)!=0) 327#define Sglext_isone_lowp1(val) (Sextlowp1(val)!=0) 328#define Sglext_isone_highp2(val) (Sexthighp2(val)!=0) 329#define Sglext_isnotzero_low31p2(val) (Sextlow31p2(val)!=0) 330#define Sglext_iszero(valA,valB) (Sextallp1(valA)==0 && Sextallp2(valB)==0) 331 332#define Sgl_copytoptr(src,destptr) *destptr = src 333#define Sgl_copyfromptr(srcptr,dest) dest = *srcptr 334#define Sglext_copy(srca,srcb,desta,destb) \ 335 Sextallp1(desta) = Sextallp1(srca); \ 336 Sextallp2(destb) = Sextallp2(srcb) 337#define Sgl_copyto_sglext(src1,dest1,dest2) \ 338 Sextallp1(dest1) = Sall(src1); Sextallp2(dest2) = 0 339 340#define Sglext_swap_lower(leftp2,rightp2) \ 341 Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \ 342 Sextallp2(rightp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \ 343 Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2) 344 345#define Sglext_setone_lowmantissap2(value) Deposit_dlowp2(value,1) 346 347/* The high bit is always zero so arithmetic or logical shifts will work. */ 348#define Sglext_right_align(srcdstA,srcdstB,shift) \ 349 {int shiftamt, sticky; \ 350 shiftamt = shift % 32; \ 351 sticky = 0; \ 352 switch (shift/32) { \ 353 case 0: if (shiftamt > 0) { \ 354 sticky = Sextallp2(srcdstB) << 32 - (shiftamt); \ 355 Variable_shift_double(Sextallp1(srcdstA), \ 356 Sextallp2(srcdstB),shiftamt,Sextallp2(srcdstB)); \ 357 Sextallp1(srcdstA) >>= shiftamt; \ 358 } \ 359 break; \ 360 case 1: if (shiftamt > 0) { \ 361 sticky = (Sextallp1(srcdstA) << 32 - (shiftamt)) | \ 362 Sextallp2(srcdstB); \ 363 } \ 364 else { \ 365 sticky = Sextallp2(srcdstB); \ 366 } \ 367 Sextallp2(srcdstB) = Sextallp1(srcdstA) >> shiftamt; \ 368 Sextallp1(srcdstA) = 0; \ 369 break; \ 370 } \ 371 if (sticky) Sglext_setone_lowmantissap2(srcdstB); \ 372 } 373 374/* The left argument is never smaller than the right argument */ 375#define Sglext_subtract(lefta,leftb,righta,rightb,resulta,resultb) \ 376 if( Sextallp2(rightb) > Sextallp2(leftb) ) Sextallp1(lefta)--; \ 377 Sextallp2(resultb) = Sextallp2(leftb) - Sextallp2(rightb); \ 378 Sextallp1(resulta) = Sextallp1(lefta) - Sextallp1(righta) 379 380#define Sglext_addition(lefta,leftb,righta,rightb,resulta,resultb) \ 381 /* If the sum of the low words is less than either source, then \ 382 * an overflow into the next word occurred. */ \ 383 if ((Sextallp2(resultb) = Sextallp2(leftb)+Sextallp2(rightb)) < \ 384 Sextallp2(rightb)) \ 385 Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)+1; \ 386 else Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta) 387 388 389#define Sglext_arithrightshiftby1(srcdstA,srcdstB) \ 390 Shiftdouble(Sextallp1(srcdstA),Sextallp2(srcdstB),1,Sextallp2(srcdstB)); \ 391 Sextallp1(srcdstA) = (int)Sextallp1(srcdstA) >> 1 392 393#define Sglext_leftshiftby8(valA,valB) \ 394 Shiftdouble(Sextallp1(valA),Sextallp2(valB),24,Sextallp1(valA)); \ 395 Sextallp2(valB) <<= 8 396#define Sglext_leftshiftby4(valA,valB) \ 397 Shiftdouble(Sextallp1(valA),Sextallp2(valB),28,Sextallp1(valA)); \ 398 Sextallp2(valB) <<= 4 399#define Sglext_leftshiftby3(valA,valB) \ 400 Shiftdouble(Sextallp1(valA),Sextallp2(valB),29,Sextallp1(valA)); \ 401 Sextallp2(valB) <<= 3 402#define Sglext_leftshiftby2(valA,valB) \ 403 Shiftdouble(Sextallp1(valA),Sextallp2(valB),30,Sextallp1(valA)); \ 404 Sextallp2(valB) <<= 2 405#define Sglext_leftshiftby1(valA,valB) \ 406 Shiftdouble(Sextallp1(valA),Sextallp2(valB),31,Sextallp1(valA)); \ 407 Sextallp2(valB) <<= 1 408 409#define Sglext_rightshiftby4(valueA,valueB) \ 410 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),4,Sextallp2(valueB)); \ 411 Sextallp1(valueA) >>= 4 412#define Sglext_rightshiftby3(valueA,valueB) \ 413 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),3,Sextallp2(valueB)); \ 414 Sextallp1(valueA) >>= 3 415#define Sglext_rightshiftby1(valueA,valueB) \ 416 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),1,Sextallp2(valueB)); \ 417 Sextallp1(valueA) >>= 1 418 419#define Sglext_xortointp1(left,right,result) Sgl_xortointp1(left,right,result) 420#define Sglext_xorfromintp1(left,right,result) \ 421 Sgl_xorfromintp1(left,right,result) 422#define Sglext_copytoint_exponentmantissa(src,dest) \ 423 Sgl_copytoint_exponentmantissa(src,dest) 424#define Sglext_ismagnitudeless(signlessleft,signlessright) \ 425 Sgl_ismagnitudeless(signlessleft,signlessright) 426 427#define Sglext_set_sign(dbl_value,sign) Sgl_set_sign(dbl_value,sign) 428#define Sglext_clear_signexponent_set_hidden(srcdst) \ 429 Sgl_clear_signexponent_set_hidden(srcdst) 430#define Sglext_clear_signexponent(srcdst) Sgl_clear_signexponent(srcdst) 431#define Sglext_clear_sign(srcdst) Sgl_clear_sign(srcdst) 432#define Sglext_isone_hidden(dbl_value) Sgl_isone_hidden(dbl_value) 433 434#define Sglext_denormalize(opndp1,opndp2,exponent,is_tiny) \ 435 {int sticky; \ 436 is_tiny = TRUE; \ 437 if (exponent == 0 && Sextallp2(opndp2)) { \ 438 switch (Rounding_mode()) { \ 439 case ROUNDPLUS: \ 440 if (Sgl_iszero_sign(opndp1)) \ 441 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \ 442 is_tiny = FALSE; \ 443 break; \ 444 case ROUNDMINUS: \ 445 if (Sgl_isone_sign(opndp1)) { \ 446 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \ 447 is_tiny = FALSE; \ 448 } \ 449 break; \ 450 case ROUNDNEAREST: \ 451 if (Sglext_isone_highp2(opndp2) && \ 452 (Sglext_isone_lowp1(opndp1) || \ 453 Sglext_isnotzero_low31p2(opndp2))) \ 454 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \ 455 is_tiny = FALSE; \ 456 break; \ 457 } \ 458 } \ 459 Sglext_clear_signexponent_set_hidden(opndp1); \ 460 if (exponent >= (1-DBL_P)) { \ 461 if (exponent >= -31) { \ 462 if (exponent > -31) { \ 463 sticky = Sextallp2(opndp2) << 31+exponent; \ 464 Variable_shift_double(opndp1,opndp2,1-exponent,opndp2); \ 465 Sextallp1(opndp1) >>= 1-exponent; \ 466 } \ 467 else { \ 468 sticky = Sextallp2(opndp2); \ 469 Sextallp2(opndp2) = Sextallp1(opndp1); \ 470 Sextallp1(opndp1) = 0; \ 471 } \ 472 } \ 473 else { \ 474 sticky = (Sextallp1(opndp1) << 31+exponent) | \ 475 Sextallp2(opndp2); \ 476 Sextallp2(opndp2) = Sextallp1(opndp1) >> -31-exponent; \ 477 Sextallp1(opndp1) = 0; \ 478 } \ 479 } \ 480 else { \ 481 sticky = Sextallp1(opndp1) | Sextallp2(opndp2); \ 482 Sglext_setzero(opndp1,opndp2); \ 483 } \ 484 if (sticky) Sglext_setone_lowmantissap2(opndp2); \ 485 exponent = 0; \ 486 } 487