arch/parisc/math-emu/sgl_float.h

   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 #ifdef __NO_PA_HDRS
  10     PA header file -- do not include this header file for non-PA builds.
  11 #endif
  12
  13 /* 32-bit word grabbing functions */
  14 #define Sgl_firstword(value) Sall(value)
  15 #define Sgl_secondword(value) dummy_location
  16 #define Sgl_thirdword(value) dummy_location
  17 #define Sgl_fourthword(value) dummy_location
  18
  19 #define Sgl_sign(object) Ssign(object)
  20 #define Sgl_exponent(object) Sexponent(object)
  21 #define Sgl_signexponent(object) Ssignexponent(object)
  22 #define Sgl_mantissa(object) Smantissa(object)
  23 #define Sgl_exponentmantissa(object) Sexponentmantissa(object)
  24 #define Sgl_all(object) Sall(object)
  25
  26 /* sgl_and_signs ANDs the sign bits of each argument and puts the result
  27  * into the first argument. sgl_or_signs ors those same sign bits */
  28 #define Sgl_and_signs( src1dst, src2)           \
  29     Sall(src1dst) = (Sall(src2)|~((unsigned int)1<<31)) & Sall(src1dst)
  30 #define Sgl_or_signs( src1dst, src2)            \
  31     Sall(src1dst) = (Sall(src2)&((unsigned int)1<<31)) | Sall(src1dst)
  32
  33 /* The hidden bit is always the low bit of the exponent */
  34 #define Sgl_clear_exponent_set_hidden(srcdst) Deposit_sexponent(srcdst,1)
  35 #define Sgl_clear_signexponent_set_hidden(srcdst) \
  36     Deposit_ssignexponent(srcdst,1)
  37 #define Sgl_clear_sign(srcdst) Sall(srcdst) &= ~((unsigned int)1<<31)
  38 #define Sgl_clear_signexponent(srcdst) Sall(srcdst) &= 0x007fffff
  39
  40 /* varamount must be less than 32 for the next three functions */
  41 #define Sgl_rightshift(srcdst, varamount)       \
  42     Sall(srcdst) >>= varamount
  43 #define Sgl_leftshift(srcdst, varamount)        \
  44     Sall(srcdst) <<= varamount
  45 #define Sgl_rightshift_exponentmantissa(srcdst, varamount) \
  46     Sall(srcdst) = \
  47         (Sexponentmantissa(srcdst) >> varamount) | \
  48         (Sall(srcdst) & ((unsigned int)1<<31))
  49
  50 #define Sgl_leftshiftby1_withextent(left,right,result) \
  51     Shiftdouble(Sall(left),Extall(right),31,Sall(result))
  52
  53 #define Sgl_rightshiftby1_withextent(left,right,dst)            \
  54     Shiftdouble(Sall(left),Extall(right),1,Extall(right))
  55 #define Sgl_arithrightshiftby1(srcdst)  \
  56     Sall(srcdst) = (int)Sall(srcdst) >> 1
  57
  58 /* Sign extend the sign bit with an integer destination */
  59 #define Sgl_signextendedsign(value) Ssignedsign(value)
  60
  61 #define Sgl_isone_hidden(sgl_value) (Shidden(sgl_value))
  62 #define Sgl_increment(sgl_value) Sall(sgl_value) += 1
  63 #define Sgl_increment_mantissa(sgl_value) \
  64     Deposit_smantissa(sgl_value,sgl_value+1)
  65 #define Sgl_decrement(sgl_value) Sall(sgl_value) -= 1
  66
  67 #define Sgl_isone_sign(sgl_value) (Is_ssign(sgl_value)!=0)
  68 #define Sgl_isone_hiddenoverflow(sgl_value) \
  69     (Is_shiddenoverflow(sgl_value)!=0)
  70 #define Sgl_isone_lowmantissa(sgl_value) (Is_slow(sgl_value)!=0)
  71 #define Sgl_isone_signaling(sgl_value) (Is_ssignaling(sgl_value)!=0)
  72 #define Sgl_is_signalingnan(sgl_value) (Ssignalingnan(sgl_value)==0x1ff)
  73 #define Sgl_isnotzero(sgl_value) (Sall(sgl_value)!=0)
  74 #define Sgl_isnotzero_hiddenhigh7mantissa(sgl_value) \
  75     (Shiddenhigh7mantissa(sgl_value)!=0)
  76 #define Sgl_isnotzero_low4(sgl_value) (Slow4(sgl_value)!=0)
  77 #define Sgl_isnotzero_exponent(sgl_value) (Sexponent(sgl_value)!=0)
  78 #define Sgl_isnotzero_mantissa(sgl_value) (Smantissa(sgl_value)!=0)
  79 #define Sgl_isnotzero_exponentmantissa(sgl_value) \
  80     (Sexponentmantissa(sgl_value)!=0)
  81 #define Sgl_iszero(sgl_value) (Sall(sgl_value)==0)
  82 #define Sgl_iszero_signaling(sgl_value) (Is_ssignaling(sgl_value)==0)
  83 #define Sgl_iszero_hidden(sgl_value) (Is_shidden(sgl_value)==0)
  84 #define Sgl_iszero_hiddenoverflow(sgl_value) \
  85     (Is_shiddenoverflow(sgl_value)==0)
  86 #define Sgl_iszero_hiddenhigh3mantissa(sgl_value) \
  87     (Shiddenhigh3mantissa(sgl_value)==0)
  88 #define Sgl_iszero_hiddenhigh7mantissa(sgl_value) \
  89     (Shiddenhigh7mantissa(sgl_value)==0)
  90 #define Sgl_iszero_sign(sgl_value) (Is_ssign(sgl_value)==0)
  91 #define Sgl_iszero_exponent(sgl_value) (Sexponent(sgl_value)==0)
  92 #define Sgl_iszero_mantissa(sgl_value) (Smantissa(sgl_value)==0)
  93 #define Sgl_iszero_exponentmantissa(sgl_value) \
  94     (Sexponentmantissa(sgl_value)==0)
  95 #define Sgl_isinfinity_exponent(sgl_value)              \
  96     (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT)
  97 #define Sgl_isnotinfinity_exponent(sgl_value)           \
  98     (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT)
  99 #define Sgl_isinfinity(sgl_value)                       \
 100     (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT &&  \
 101     Sgl_mantissa(sgl_value)==0)
 102 #define Sgl_isnan(sgl_value)                            \
 103     (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT &&  \
 104     Sgl_mantissa(sgl_value)!=0)
 105 #define Sgl_isnotnan(sgl_value)                         \
 106     (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT ||  \
 107     Sgl_mantissa(sgl_value)==0)
 108 #define Sgl_islessthan(sgl_op1,sgl_op2)                 \
 109     (Sall(sgl_op1) < Sall(sgl_op2))
 110 #define Sgl_isgreaterthan(sgl_op1,sgl_op2)              \
 111     (Sall(sgl_op1) > Sall(sgl_op2))
 112 #define Sgl_isnotlessthan(sgl_op1,sgl_op2)              \
 113     (Sall(sgl_op1) >= Sall(sgl_op2))
 114 #define Sgl_isequal(sgl_op1,sgl_op2)                    \
 115     (Sall(sgl_op1) == Sall(sgl_op2))
 116
 117 #define Sgl_leftshiftby8(sgl_value) \
 118     Sall(sgl_value) <<= 8
 119 #define Sgl_leftshiftby4(sgl_value) \
 120     Sall(sgl_value) <<= 4
 121 #define Sgl_leftshiftby3(sgl_value) \
 122     Sall(sgl_value) <<= 3
 123 #define Sgl_leftshiftby2(sgl_value) \
 124     Sall(sgl_value) <<= 2
 125 #define Sgl_leftshiftby1(sgl_value) \
 126     Sall(sgl_value) <<= 1
 127 #define Sgl_rightshiftby1(sgl_value) \
 128     Sall(sgl_value) >>= 1
 129 #define Sgl_rightshiftby4(sgl_value) \
 130     Sall(sgl_value) >>= 4
 131 #define Sgl_rightshiftby8(sgl_value) \
 132     Sall(sgl_value) >>= 8
 133
 134 #define Sgl_ismagnitudeless(signlessleft,signlessright)                 \
 135 /*  unsigned int signlessleft, signlessright; */                        \
 136       (signlessleft < signlessright)
 137
 138
 139 #define Sgl_copytoint_exponentmantissa(source,dest)     \
 140     dest = Sexponentmantissa(source)
 141
 142 /* A quiet NaN has the high mantissa bit clear and at least on other (in this
 143  * case the adjacent bit) bit set. */
 144 #define Sgl_set_quiet(sgl_value) Deposit_shigh2mantissa(sgl_value,1)
 145 #define Sgl_set_exponent(sgl_value,exp) Deposit_sexponent(sgl_value,exp)
 146
 147 #define Sgl_set_mantissa(dest,value) Deposit_smantissa(dest,value)
 148 #define Sgl_set_exponentmantissa(dest,value) \
 149     Deposit_sexponentmantissa(dest,value)
 150
 151 /*  An infinity is represented with the max exponent and a zero mantissa */
 152 #define Sgl_setinfinity_exponent(sgl_value) \
 153     Deposit_sexponent(sgl_value,SGL_INFINITY_EXPONENT)
 154 #define Sgl_setinfinity_exponentmantissa(sgl_value)     \
 155     Deposit_sexponentmantissa(sgl_value, \
 156         (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))))
 157 #define Sgl_setinfinitypositive(sgl_value)              \
 158     Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH)))
 159 #define Sgl_setinfinitynegative(sgl_value)              \
 160     Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) \
 161     | ((unsigned int)1<<31)
 162 #define Sgl_setinfinity(sgl_value,sign)                                 \
 163     Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) | \
 164      ((unsigned int)sign << 31)
 165 #define Sgl_sethigh4bits(sgl_value, extsign)  \
 166     Deposit_shigh4(sgl_value,extsign)
 167 #define Sgl_set_sign(sgl_value,sign) Deposit_ssign(sgl_value,sign)
 168 #define Sgl_invert_sign(sgl_value)  \
 169     Deposit_ssign(sgl_value,~Ssign(sgl_value))
 170 #define Sgl_setone_sign(sgl_value) Deposit_ssign(sgl_value,1)
 171 #define Sgl_setone_lowmantissa(sgl_value) Deposit_slow(sgl_value,1)
 172 #define Sgl_setzero_sign(sgl_value)  Sall(sgl_value) &= 0x7fffffff
 173 #define Sgl_setzero_exponent(sgl_value) Sall(sgl_value) &= 0x807fffff
 174 #define Sgl_setzero_mantissa(sgl_value) Sall(sgl_value) &= 0xff800000
 175 #define Sgl_setzero_exponentmantissa(sgl_value)  Sall(sgl_value) &= 0x80000000
 176 #define Sgl_setzero(sgl_value) Sall(sgl_value) = 0
 177 #define Sgl_setnegativezero(sgl_value) Sall(sgl_value) = (unsigned int)1 << 31
 178
 179 /* Use following macro for both overflow & underflow conditions */
 180 #define ovfl -
 181 #define unfl +
 182 #define Sgl_setwrapped_exponent(sgl_value,exponent,op) \
 183     Deposit_sexponent(sgl_value,(exponent op SGL_WRAP))
 184
 185 #define Sgl_setlargestpositive(sgl_value)                               \
 186     Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))  \
 187                       | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 )
 188 #define Sgl_setlargestnegative(sgl_value)                               \
 189     Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))  \
 190                       | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 )             \
 191                       | ((unsigned int)1<<31)
 192
 193 #define Sgl_setnegativeinfinity(sgl_value)      \
 194     Sall(sgl_value) =                           \
 195     ((1<<SGL_EXP_LENGTH) | SGL_INFINITY_EXPONENT) << (32-(1+SGL_EXP_LENGTH))
 196 #define Sgl_setlargest(sgl_value,sign)                                  \
 197     Sall(sgl_value) = (unsigned int)sign << 31 |                        \
 198         (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))               \
 199           | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
 200 #define Sgl_setlargest_exponentmantissa(sgl_value)                      \
 201     Sall(sgl_value) = Sall(sgl_value) & ((unsigned int)1<<31) |         \
 202         (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH)))               \
 203           | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
 204
 205 /* The high bit is always zero so arithmetic or logical shifts will work. */
 206 #define Sgl_right_align(srcdst,shift,extent)                            \
 207     /* sgl_floating_point srcdst; int shift; extension extent */        \
 208     if (shift < 32) {                                                   \
 209         Extall(extent) = Sall(srcdst) << (32-(shift));                  \
 210         Sall(srcdst) >>= shift;                                         \
 211     }                                                                   \
 212     else {                                                              \
 213         Extall(extent) = Sall(srcdst);                                  \
 214         Sall(srcdst) = 0;                                               \
 215     }
 216 #define Sgl_hiddenhigh3mantissa(sgl_value) Shiddenhigh3mantissa(sgl_value)
 217 #define Sgl_hidden(sgl_value) Shidden(sgl_value)
 218 #define Sgl_lowmantissa(sgl_value) Slow(sgl_value)
 219
 220 /* The left argument is never smaller than the right argument */
 221 #define Sgl_subtract(sgl_left,sgl_right,sgl_result) \
 222     Sall(sgl_result) = Sall(sgl_left) - Sall(sgl_right)
 223
 224 /* Subtract right augmented with extension from left augmented with zeros and
 225  * store into result and extension. */
 226 #define Sgl_subtract_withextension(left,right,extent,result)            \
 227     /* sgl_floating_point left,right,result; extension extent */        \
 228   Sgl_subtract(left,right,result);                                      \
 229   if((Extall(extent) = 0-Extall(extent)))                               \
 230       Sall(result) = Sall(result)-1
 231
 232 #define Sgl_addition(sgl_left,sgl_right,sgl_result) \
 233     Sall(sgl_result) = Sall(sgl_left) + Sall(sgl_right)
 234
 235 #define Sgl_xortointp1(left,right,result)                       \
 236     result = Sall(left) XOR Sall(right);
 237
 238 #define Sgl_xorfromintp1(left,right,result)                     \
 239     Sall(result) = left XOR Sall(right)
 240
 241 /* Need to Initialize */
 242 #define Sgl_makequietnan(dest)                                          \
 243     Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH))      \
 244                  | (1<<(32-(1+SGL_EXP_LENGTH+2)))
 245 #define Sgl_makesignalingnan(dest)                                      \
 246     Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH))      \
 247                  | (1<<(32-(1+SGL_EXP_LENGTH+1)))
 248
 249 #define Sgl_normalize(sgl_opnd,exponent)                        \
 250         while(Sgl_iszero_hiddenhigh7mantissa(sgl_opnd)) {       \
 251                 Sgl_leftshiftby8(sgl_opnd);                     \
 252                 exponent -= 8;                                  \
 253         }                                                       \
 254         if(Sgl_iszero_hiddenhigh3mantissa(sgl_opnd)) {          \
 255                 Sgl_leftshiftby4(sgl_opnd);                     \
 256                 exponent -= 4;                                  \
 257         }                                                       \
 258         while(Sgl_iszero_hidden(sgl_opnd)) {                    \
 259                 Sgl_leftshiftby1(sgl_opnd);                     \
 260                 exponent -= 1;                                  \
 261         }
 262
 263 #define Sgl_setoverflow(sgl_opnd)                               \
 264         /* set result to infinity or largest number */          \
 265         switch (Rounding_mode()) {                              \
 266                 case ROUNDPLUS:                                 \
 267                         if (Sgl_isone_sign(sgl_opnd)) {         \
 268                                 Sgl_setlargestnegative(sgl_opnd); \
 269                         }                                       \
 270                         else {                                  \
 271                                 Sgl_setinfinitypositive(sgl_opnd); \
 272                         }                                       \
 273                         break;                                  \
 274                 case ROUNDMINUS:                                \
 275                         if (Sgl_iszero_sign(sgl_opnd)) {        \
 276                                 Sgl_setlargestpositive(sgl_opnd); \
 277                         }                                       \
 278                         else {                                  \
 279                                 Sgl_setinfinitynegative(sgl_opnd); \
 280                         }                                       \
 281                         break;                                  \
 282                 case ROUNDNEAREST:                              \
 283                         Sgl_setinfinity_exponentmantissa(sgl_opnd); \
 284                         break;                                  \
 285                 case ROUNDZERO:                                 \
 286                         Sgl_setlargest_exponentmantissa(sgl_opnd); \
 287         }
 288
 289 #define Sgl_denormalize(opnd,exponent,guard,sticky,inexact)             \
 290         Sgl_clear_signexponent_set_hidden(opnd);                        \
 291         if (exponent >= (1 - SGL_P)) {                                  \
 292                 guard = (Sall(opnd) >> -exponent) & 1;                  \
 293                 if (exponent < 0) sticky |= Sall(opnd) << (32+exponent); \
 294                 inexact = guard | sticky;                               \
 295                 Sall(opnd) >>= (1-exponent);                            \
 296         }                                                               \
 297         else {                                                          \
 298                 guard = 0;                                              \
 299                 sticky |= Sall(opnd);                                   \
 300                 inexact = sticky;                                       \
 301                 Sgl_setzero(opnd);                                      \
 302         }
 303
 304 /*
 305  * The fused multiply add instructions requires a single extended format,
 306  * with 48 bits of mantissa.
 307  */
 308 #define SGLEXT_THRESHOLD 48
 309
 310 #define Sglext_setzero(valA,valB)       \
 311     Sextallp1(valA) = 0; Sextallp2(valB) = 0
 312
 313 #define Sglext_isnotzero_mantissap2(valB) (Sextallp2(valB)!=0)
 314 #define Sglext_isone_lowp1(val) (Sextlowp1(val)!=0)
 315 #define Sglext_isone_highp2(val) (Sexthighp2(val)!=0)
 316 #define Sglext_isnotzero_low31p2(val) (Sextlow31p2(val)!=0)
 317 #define Sglext_iszero(valA,valB) (Sextallp1(valA)==0 && Sextallp2(valB)==0)
 318
 319 #define Sgl_copytoptr(src,destptr) *destptr = src
 320 #define Sgl_copyfromptr(srcptr,dest) dest = *srcptr
 321 #define Sglext_copy(srca,srcb,desta,destb) \
 322     Sextallp1(desta) = Sextallp1(srca); \
 323     Sextallp2(destb) = Sextallp2(srcb)
 324 #define Sgl_copyto_sglext(src1,dest1,dest2) \
 325         Sextallp1(dest1) = Sall(src1); Sextallp2(dest2) = 0
 326
 327 #define Sglext_swap_lower(leftp2,rightp2)  \
 328     Sextallp2(leftp2)  = Sextallp2(leftp2) XOR Sextallp2(rightp2);  \
 329     Sextallp2(rightp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2);  \
 330     Sextallp2(leftp2)  = Sextallp2(leftp2) XOR Sextallp2(rightp2)
 331
 332 #define Sglext_setone_lowmantissap2(value) Deposit_dlowp2(value,1)
 333
 334 /* The high bit is always zero so arithmetic or logical shifts will work. */
 335 #define Sglext_right_align(srcdstA,srcdstB,shift) \
 336   {int shiftamt, sticky;                                                \
 337     shiftamt = shift % 32;                                              \
 338     sticky = 0;                                                         \
 339     switch (shift/32) {                                                 \
 340      case 0: if (shiftamt > 0) {                                        \
 341                 sticky = Sextallp2(srcdstB) << 32 - (shiftamt);         \
 342                 Variable_shift_double(Sextallp1(srcdstA),               \
 343                  Sextallp2(srcdstB),shiftamt,Sextallp2(srcdstB));       \
 344                 Sextallp1(srcdstA) >>= shiftamt;                        \
 345              }                                                          \
 346              break;                                                     \
 347      case 1: if (shiftamt > 0) {                                        \
 348                 sticky = (Sextallp1(srcdstA) << 32 - (shiftamt)) |      \
 349                          Sextallp2(srcdstB);                            \
 350              }                                                          \
 351              else {                                                     \
 352                 sticky = Sextallp2(srcdstB);                            \
 353              }                                                          \
 354              Sextallp2(srcdstB) = Sextallp1(srcdstA) >> shiftamt;       \
 355              Sextallp1(srcdstA) = 0;                                    \
 356              break;                                                     \
 357     }                                                                   \
 358     if (sticky) Sglext_setone_lowmantissap2(srcdstB);                   \
 359   }
 360
 361 /* The left argument is never smaller than the right argument */
 362 #define Sglext_subtract(lefta,leftb,righta,rightb,resulta,resultb) \
 363     if( Sextallp2(rightb) > Sextallp2(leftb) ) Sextallp1(lefta)--; \
 364     Sextallp2(resultb) = Sextallp2(leftb) - Sextallp2(rightb);  \
 365     Sextallp1(resulta) = Sextallp1(lefta) - Sextallp1(righta)
 366
 367 #define Sglext_addition(lefta,leftb,righta,rightb,resulta,resultb) \
 368     /* If the sum of the low words is less than either source, then \
 369      * an overflow into the next word occurred. */ \
 370     if ((Sextallp2(resultb) = Sextallp2(leftb)+Sextallp2(rightb)) < \
 371         Sextallp2(rightb)) \
 372             Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)+1; \
 373     else Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)
 374
 375
 376 #define Sglext_arithrightshiftby1(srcdstA,srcdstB)      \
 377     Shiftdouble(Sextallp1(srcdstA),Sextallp2(srcdstB),1,Sextallp2(srcdstB)); \
 378     Sextallp1(srcdstA) = (int)Sextallp1(srcdstA) >> 1
 379
 380 #define Sglext_leftshiftby8(valA,valB) \
 381     Shiftdouble(Sextallp1(valA),Sextallp2(valB),24,Sextallp1(valA)); \
 382     Sextallp2(valB) <<= 8
 383 #define Sglext_leftshiftby4(valA,valB) \
 384     Shiftdouble(Sextallp1(valA),Sextallp2(valB),28,Sextallp1(valA)); \
 385     Sextallp2(valB) <<= 4
 386 #define Sglext_leftshiftby3(valA,valB) \
 387     Shiftdouble(Sextallp1(valA),Sextallp2(valB),29,Sextallp1(valA)); \
 388     Sextallp2(valB) <<= 3
 389 #define Sglext_leftshiftby2(valA,valB) \
 390     Shiftdouble(Sextallp1(valA),Sextallp2(valB),30,Sextallp1(valA)); \
 391     Sextallp2(valB) <<= 2
 392 #define Sglext_leftshiftby1(valA,valB) \
 393     Shiftdouble(Sextallp1(valA),Sextallp2(valB),31,Sextallp1(valA)); \
 394     Sextallp2(valB) <<= 1
 395
 396 #define Sglext_rightshiftby4(valueA,valueB) \
 397     Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),4,Sextallp2(valueB)); \
 398     Sextallp1(valueA) >>= 4
 399 #define Sglext_rightshiftby3(valueA,valueB) \
 400     Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),3,Sextallp2(valueB)); \
 401     Sextallp1(valueA) >>= 3
 402 #define Sglext_rightshiftby1(valueA,valueB) \
 403     Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),1,Sextallp2(valueB)); \
 404     Sextallp1(valueA) >>= 1
 405
 406 #define Sglext_xortointp1(left,right,result) Sgl_xortointp1(left,right,result)
 407 #define Sglext_xorfromintp1(left,right,result) \
 408         Sgl_xorfromintp1(left,right,result)
 409 #define Sglext_copytoint_exponentmantissa(src,dest) \
 410         Sgl_copytoint_exponentmantissa(src,dest)
 411 #define Sglext_ismagnitudeless(signlessleft,signlessright) \
 412         Sgl_ismagnitudeless(signlessleft,signlessright)
 413
 414 #define Sglext_set_sign(dbl_value,sign)  Sgl_set_sign(dbl_value,sign)
 415 #define Sglext_clear_signexponent_set_hidden(srcdst) \
 416         Sgl_clear_signexponent_set_hidden(srcdst)
 417 #define Sglext_clear_signexponent(srcdst) Sgl_clear_signexponent(srcdst)
 418 #define Sglext_clear_sign(srcdst) Sgl_clear_sign(srcdst)
 419 #define Sglext_isone_hidden(dbl_value) Sgl_isone_hidden(dbl_value)
 420
 421 #define Sglext_denormalize(opndp1,opndp2,exponent,is_tiny)              \
 422   {int sticky;                                                          \
 423     is_tiny = TRUE;                                                     \
 424     if (exponent == 0 && Sextallp2(opndp2)) {                           \
 425         switch (Rounding_mode()) {                                      \
 426         case ROUNDPLUS:                                                 \
 427                 if (Sgl_iszero_sign(opndp1))                            \
 428                         if (Sgl_isone_hiddenoverflow(opndp1 + 1))       \
 429                                 is_tiny = FALSE;                        \
 430                 break;                                                  \
 431         case ROUNDMINUS:                                                \
 432                 if (Sgl_isone_sign(opndp1)) {                           \
 433                         if (Sgl_isone_hiddenoverflow(opndp1 + 1))       \
 434                                 is_tiny = FALSE;                        \
 435                 }                                                       \
 436                 break;                                                  \
 437         case ROUNDNEAREST:                                              \
 438                 if (Sglext_isone_highp2(opndp2) &&                      \
 439                     (Sglext_isone_lowp1(opndp1) ||                      \
 440                      Sglext_isnotzero_low31p2(opndp2)))                 \
 441                         if (Sgl_isone_hiddenoverflow(opndp1 + 1))       \
 442                                 is_tiny = FALSE;                        \
 443                 break;                                                  \
 444         }                                                               \
 445     }                                                                   \
 446     Sglext_clear_signexponent_set_hidden(opndp1);                       \
 447     if (exponent >= (1-DBL_P)) {                                        \
 448         if (exponent >= -31) {                                          \
 449             if (exponent > -31) {                                       \
 450                 sticky = Sextallp2(opndp2) << 31+exponent;              \
 451                 Variable_shift_double(opndp1,opndp2,1-exponent,opndp2); \
 452                 Sextallp1(opndp1) >>= 1-exponent;                       \
 453             }                                                           \
 454             else {                                                      \
 455                 sticky = Sextallp2(opndp2);                             \
 456                 Sextallp2(opndp2) = Sextallp1(opndp1);                  \
 457                 Sextallp1(opndp1) = 0;                                  \
 458             }                                                           \
 459         }                                                               \
 460         else {                                                          \
 461             sticky = (Sextallp1(opndp1) << 31+exponent) |               \
 462                      Sextallp2(opndp2);                                 \
 463             Sextallp2(opndp2) = Sextallp1(opndp1) >> -31-exponent;      \
 464             Sextallp1(opndp1) = 0;                                      \
 465         }                                                               \
 466     }                                                                   \
 467     else {                                                              \
 468         sticky = Sextallp1(opndp1) | Sextallp2(opndp2);                 \
 469         Sglext_setzero(opndp1,opndp2);                                  \
 470     }                                                                   \
 471     if (sticky) Sglext_setone_lowmantissap2(opndp2);                    \
 472     exponent = 0;                                                       \
 473   }