arch/parisc/math-emu/dbl_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 #ifdef __NO_PA_HDRS
   9     PA header file -- do not include this header file for non-PA builds.
  10 #endif
  11
  12 /* 32-bit word grabbing functions */
  13 #define Dbl_firstword(value) Dallp1(value)
  14 #define Dbl_secondword(value) Dallp2(value)
  15 #define Dbl_thirdword(value) dummy_location
  16 #define Dbl_fourthword(value) dummy_location
  17
  18 #define Dbl_sign(object) Dsign(object)
  19 #define Dbl_exponent(object) Dexponent(object)
  20 #define Dbl_signexponent(object) Dsignexponent(object)
  21 #define Dbl_mantissap1(object) Dmantissap1(object)
  22 #define Dbl_mantissap2(object) Dmantissap2(object)
  23 #define Dbl_exponentmantissap1(object) Dexponentmantissap1(object)
  24 #define Dbl_allp1(object) Dallp1(object)
  25 #define Dbl_allp2(object) Dallp2(object)
  26
  27 /* dbl_and_signs ANDs the sign bits of each argument and puts the result
  28  * into the first argument. dbl_or_signs ors those same sign bits */
  29 #define Dbl_and_signs( src1dst, src2)           \
  30     Dallp1(src1dst) = (Dallp1(src2)|~((unsigned int)1<<31)) & Dallp1(src1dst)
  31 #define Dbl_or_signs( src1dst, src2)            \
  32     Dallp1(src1dst) = (Dallp1(src2)&((unsigned int)1<<31)) | Dallp1(src1dst)
  33
  34 /* The hidden bit is always the low bit of the exponent */
  35 #define Dbl_clear_exponent_set_hidden(srcdst) Deposit_dexponent(srcdst,1)
  36 #define Dbl_clear_signexponent_set_hidden(srcdst) \
  37     Deposit_dsignexponent(srcdst,1)
  38 #define Dbl_clear_sign(srcdst) Dallp1(srcdst) &= ~((unsigned int)1<<31)
  39 #define Dbl_clear_signexponent(srcdst) \
  40     Dallp1(srcdst) &= Dmantissap1((unsigned int)-1)
  41
  42 /* Exponent field for doubles has already been cleared and may be
  43  * included in the shift.  Here we need to generate two double width
  44  * variable shifts.  The insignificant bits can be ignored.
  45  *      MTSAR f(varamount)
  46  *      VSHD    srcdst.high,srcdst.low => srcdst.low
  47  *      VSHD    0,srcdst.high => srcdst.high
  48  * This is very difficult to model with C expressions since the shift amount
  49  * could exceed 32.  */
  50 /* varamount must be less than 64 */
  51 #define Dbl_rightshift(srcdstA, srcdstB, varamount)                     \
  52     {if((varamount) >= 32) {                                            \
  53         Dallp2(srcdstB) = Dallp1(srcdstA) >> (varamount-32);            \
  54         Dallp1(srcdstA)=0;                                              \
  55     }                                                                   \
  56     else if(varamount > 0) {                                            \
  57         Variable_shift_double(Dallp1(srcdstA), Dallp2(srcdstB),         \
  58           (varamount), Dallp2(srcdstB));                                \
  59         Dallp1(srcdstA) >>= varamount;                                  \
  60     } }
  61 /* varamount must be less than 64 */
  62 #define Dbl_rightshift_exponentmantissa(srcdstA, srcdstB, varamount)    \
  63     {if((varamount) >= 32) {                                            \
  64         Dallp2(srcdstB) = Dexponentmantissap1(srcdstA) >> (varamount-32); \
  65         Dallp1(srcdstA) &= ((unsigned int)1<<31);  /* clear expmant field */ \
  66     }                                                                   \
  67     else if(varamount > 0) {                                            \
  68         Variable_shift_double(Dexponentmantissap1(srcdstA), Dallp2(srcdstB), \
  69         (varamount), Dallp2(srcdstB));                                  \
  70         Deposit_dexponentmantissap1(srcdstA,                            \
  71             (Dexponentmantissap1(srcdstA)>>varamount));                 \
  72     } }
  73 /* varamount must be less than 64 */
  74 #define Dbl_leftshift(srcdstA, srcdstB, varamount)                      \
  75     {if((varamount) >= 32) {                                            \
  76         Dallp1(srcdstA) = Dallp2(srcdstB) << (varamount-32);            \
  77         Dallp2(srcdstB)=0;                                              \
  78     }                                                                   \
  79     else {                                                              \
  80         if ((varamount) > 0) {                                          \
  81             Dallp1(srcdstA) = (Dallp1(srcdstA) << (varamount)) |        \
  82                 (Dallp2(srcdstB) >> (32-(varamount)));                  \
  83             Dallp2(srcdstB) <<= varamount;                              \
  84         }                                                               \
  85     } }
  86 #define Dbl_leftshiftby1_withextent(lefta,leftb,right,resulta,resultb)  \
  87     Shiftdouble(Dallp1(lefta), Dallp2(leftb), 31, Dallp1(resulta));     \
  88     Shiftdouble(Dallp2(leftb), Extall(right), 31, Dallp2(resultb))
  89
  90 #define Dbl_rightshiftby1_withextent(leftb,right,dst)           \
  91     Extall(dst) = (Dallp2(leftb) << 31) | ((unsigned int)Extall(right) >> 1) | \
  92                   Extlow(right)
  93
  94 #define Dbl_arithrightshiftby1(srcdstA,srcdstB)                 \
  95     Shiftdouble(Dallp1(srcdstA),Dallp2(srcdstB),1,Dallp2(srcdstB));\
  96     Dallp1(srcdstA) = (int)Dallp1(srcdstA) >> 1
  97
  98 /* Sign extend the sign bit with an integer destination */
  99 #define Dbl_signextendedsign(value)  Dsignedsign(value)
 100
 101 #define Dbl_isone_hidden(dbl_value) (Is_dhidden(dbl_value)!=0)
 102 /* Singles and doubles may include the sign and exponent fields.  The
 103  * hidden bit and the hidden overflow must be included. */
 104 #define Dbl_increment(dbl_valueA,dbl_valueB) \
 105     if( (Dallp2(dbl_valueB) += 1) == 0 )  Dallp1(dbl_valueA) += 1
 106 #define Dbl_increment_mantissa(dbl_valueA,dbl_valueB) \
 107     if( (Dmantissap2(dbl_valueB) += 1) == 0 )  \
 108     Deposit_dmantissap1(dbl_valueA,dbl_valueA+1)
 109 #define Dbl_decrement(dbl_valueA,dbl_valueB) \
 110     if( Dallp2(dbl_valueB) == 0 )  Dallp1(dbl_valueA) -= 1; \
 111     Dallp2(dbl_valueB) -= 1
 112
 113 #define Dbl_isone_sign(dbl_value) (Is_dsign(dbl_value)!=0)
 114 #define Dbl_isone_hiddenoverflow(dbl_value) (Is_dhiddenoverflow(dbl_value)!=0)
 115 #define Dbl_isone_lowmantissap1(dbl_valueA) (Is_dlowp1(dbl_valueA)!=0)
 116 #define Dbl_isone_lowmantissap2(dbl_valueB) (Is_dlowp2(dbl_valueB)!=0)
 117 #define Dbl_isone_signaling(dbl_value) (Is_dsignaling(dbl_value)!=0)
 118 #define Dbl_is_signalingnan(dbl_value) (Dsignalingnan(dbl_value)==0xfff)
 119 #define Dbl_isnotzero(dbl_valueA,dbl_valueB) \
 120     (Dallp1(dbl_valueA) || Dallp2(dbl_valueB))
 121 #define Dbl_isnotzero_hiddenhigh7mantissa(dbl_value) \
 122     (Dhiddenhigh7mantissa(dbl_value)!=0)
 123 #define Dbl_isnotzero_exponent(dbl_value) (Dexponent(dbl_value)!=0)
 124 #define Dbl_isnotzero_mantissa(dbl_valueA,dbl_valueB) \
 125     (Dmantissap1(dbl_valueA) || Dmantissap2(dbl_valueB))
 126 #define Dbl_isnotzero_mantissap1(dbl_valueA) (Dmantissap1(dbl_valueA)!=0)
 127 #define Dbl_isnotzero_mantissap2(dbl_valueB) (Dmantissap2(dbl_valueB)!=0)
 128 #define Dbl_isnotzero_exponentmantissa(dbl_valueA,dbl_valueB) \
 129     (Dexponentmantissap1(dbl_valueA) || Dmantissap2(dbl_valueB))
 130 #define Dbl_isnotzero_low4p2(dbl_value) (Dlow4p2(dbl_value)!=0)
 131 #define Dbl_iszero(dbl_valueA,dbl_valueB) (Dallp1(dbl_valueA)==0 && \
 132     Dallp2(dbl_valueB)==0)
 133 #define Dbl_iszero_allp1(dbl_value) (Dallp1(dbl_value)==0)
 134 #define Dbl_iszero_allp2(dbl_value) (Dallp2(dbl_value)==0)
 135 #define Dbl_iszero_hidden(dbl_value) (Is_dhidden(dbl_value)==0)
 136 #define Dbl_iszero_hiddenoverflow(dbl_value) (Is_dhiddenoverflow(dbl_value)==0)
 137 #define Dbl_iszero_hiddenhigh3mantissa(dbl_value) \
 138     (Dhiddenhigh3mantissa(dbl_value)==0)
 139 #define Dbl_iszero_hiddenhigh7mantissa(dbl_value) \
 140     (Dhiddenhigh7mantissa(dbl_value)==0)
 141 #define Dbl_iszero_sign(dbl_value) (Is_dsign(dbl_value)==0)
 142 #define Dbl_iszero_exponent(dbl_value) (Dexponent(dbl_value)==0)
 143 #define Dbl_iszero_mantissa(dbl_valueA,dbl_valueB) \
 144     (Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
 145 #define Dbl_iszero_exponentmantissa(dbl_valueA,dbl_valueB) \
 146     (Dexponentmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
 147 #define Dbl_isinfinity_exponent(dbl_value)              \
 148     (Dexponent(dbl_value)==DBL_INFINITY_EXPONENT)
 149 #define Dbl_isnotinfinity_exponent(dbl_value)           \
 150     (Dexponent(dbl_value)!=DBL_INFINITY_EXPONENT)
 151 #define Dbl_isinfinity(dbl_valueA,dbl_valueB)                   \
 152     (Dexponent(dbl_valueA)==DBL_INFINITY_EXPONENT &&    \
 153     Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
 154 #define Dbl_isnan(dbl_valueA,dbl_valueB)                \
 155     (Dexponent(dbl_valueA)==DBL_INFINITY_EXPONENT &&    \
 156     (Dmantissap1(dbl_valueA)!=0 || Dmantissap2(dbl_valueB)!=0))
 157 #define Dbl_isnotnan(dbl_valueA,dbl_valueB)             \
 158     (Dexponent(dbl_valueA)!=DBL_INFINITY_EXPONENT ||    \
 159     (Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0))
 160
 161 #define Dbl_islessthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)     \
 162     (Dallp1(dbl_op1a) < Dallp1(dbl_op2a) ||                     \
 163      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
 164       Dallp2(dbl_op1b) < Dallp2(dbl_op2b)))
 165 #define Dbl_isgreaterthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)  \
 166     (Dallp1(dbl_op1a) > Dallp1(dbl_op2a) ||                     \
 167      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
 168       Dallp2(dbl_op1b) > Dallp2(dbl_op2b)))
 169 #define Dbl_isnotlessthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)  \
 170     (Dallp1(dbl_op1a) > Dallp1(dbl_op2a) ||                     \
 171      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
 172       Dallp2(dbl_op1b) >= Dallp2(dbl_op2b)))
 173 #define Dbl_isnotgreaterthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b) \
 174     (Dallp1(dbl_op1a) < Dallp1(dbl_op2a) ||                     \
 175      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
 176       Dallp2(dbl_op1b) <= Dallp2(dbl_op2b)))
 177 #define Dbl_isequal(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)        \
 178      ((Dallp1(dbl_op1a) == Dallp1(dbl_op2a)) &&                 \
 179       (Dallp2(dbl_op1b) == Dallp2(dbl_op2b)))
 180
 181 #define Dbl_leftshiftby8(dbl_valueA,dbl_valueB) \
 182     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),24,Dallp1(dbl_valueA)); \
 183     Dallp2(dbl_valueB) <<= 8
 184 #define Dbl_leftshiftby7(dbl_valueA,dbl_valueB) \
 185     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),25,Dallp1(dbl_valueA)); \
 186     Dallp2(dbl_valueB) <<= 7
 187 #define Dbl_leftshiftby4(dbl_valueA,dbl_valueB) \
 188     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),28,Dallp1(dbl_valueA)); \
 189     Dallp2(dbl_valueB) <<= 4
 190 #define Dbl_leftshiftby3(dbl_valueA,dbl_valueB) \
 191     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),29,Dallp1(dbl_valueA)); \
 192     Dallp2(dbl_valueB) <<= 3
 193 #define Dbl_leftshiftby2(dbl_valueA,dbl_valueB) \
 194     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),30,Dallp1(dbl_valueA)); \
 195     Dallp2(dbl_valueB) <<= 2
 196 #define Dbl_leftshiftby1(dbl_valueA,dbl_valueB) \
 197     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),31,Dallp1(dbl_valueA)); \
 198     Dallp2(dbl_valueB) <<= 1
 199
 200 #define Dbl_rightshiftby8(dbl_valueA,dbl_valueB) \
 201     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),8,Dallp2(dbl_valueB)); \
 202     Dallp1(dbl_valueA) >>= 8
 203 #define Dbl_rightshiftby4(dbl_valueA,dbl_valueB) \
 204     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),4,Dallp2(dbl_valueB)); \
 205     Dallp1(dbl_valueA) >>= 4
 206 #define Dbl_rightshiftby2(dbl_valueA,dbl_valueB) \
 207     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),2,Dallp2(dbl_valueB)); \
 208     Dallp1(dbl_valueA) >>= 2
 209 #define Dbl_rightshiftby1(dbl_valueA,dbl_valueB) \
 210     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),1,Dallp2(dbl_valueB)); \
 211     Dallp1(dbl_valueA) >>= 1
 212
 213 /* This magnitude comparison uses the signless first words and
 214  * the regular part2 words.  The comparison is graphically:
 215  *
 216  *       1st greater?  -------------
 217  *                                 |
 218  *       1st less?-----------------+---------
 219  *                                 |        |
 220  *       2nd greater or equal----->|        |
 221  *                               False     True
 222  */
 223 #define Dbl_ismagnitudeless(leftB,rightB,signlessleft,signlessright)    \
 224       ((signlessleft <= signlessright) &&                               \
 225        ( (signlessleft < signlessright) || (Dallp2(leftB)<Dallp2(rightB)) ))
 226
 227 #define Dbl_copytoint_exponentmantissap1(src,dest) \
 228     dest = Dexponentmantissap1(src)
 229
 230 /* A quiet NaN has the high mantissa bit clear and at least on other (in this
 231  * case the adjacent bit) bit set. */
 232 #define Dbl_set_quiet(dbl_value) Deposit_dhigh2mantissa(dbl_value,1)
 233 #define Dbl_set_exponent(dbl_value, exp) Deposit_dexponent(dbl_value,exp)
 234
 235 #define Dbl_set_mantissa(desta,destb,valuea,valueb)     \
 236     Deposit_dmantissap1(desta,valuea);                  \
 237     Dmantissap2(destb) = Dmantissap2(valueb)
 238 #define Dbl_set_mantissap1(desta,valuea)                \
 239     Deposit_dmantissap1(desta,valuea)
 240 #define Dbl_set_mantissap2(destb,valueb)                \
 241     Dmantissap2(destb) = Dmantissap2(valueb)
 242
 243 #define Dbl_set_exponentmantissa(desta,destb,valuea,valueb)     \
 244     Deposit_dexponentmantissap1(desta,valuea);                  \
 245     Dmantissap2(destb) = Dmantissap2(valueb)
 246 #define Dbl_set_exponentmantissap1(dest,value)                  \
 247     Deposit_dexponentmantissap1(dest,value)
 248
 249 #define Dbl_copyfromptr(src,desta,destb) \
 250     Dallp1(desta) = src->wd0;           \
 251     Dallp2(destb) = src->wd1
 252 #define Dbl_copytoptr(srca,srcb,dest)   \
 253     dest->wd0 = Dallp1(srca);           \
 254     dest->wd1 = Dallp2(srcb)
 255
 256 /*  An infinity is represented with the max exponent and a zero mantissa */
 257 #define Dbl_setinfinity_exponent(dbl_value) \
 258     Deposit_dexponent(dbl_value,DBL_INFINITY_EXPONENT)
 259 #define Dbl_setinfinity_exponentmantissa(dbl_valueA,dbl_valueB) \
 260     Deposit_dexponentmantissap1(dbl_valueA,                     \
 261     (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH))));        \
 262     Dmantissap2(dbl_valueB) = 0
 263 #define Dbl_setinfinitypositive(dbl_valueA,dbl_valueB)          \
 264     Dallp1(dbl_valueA)                                          \
 265         = (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));   \
 266     Dmantissap2(dbl_valueB) = 0
 267 #define Dbl_setinfinitynegative(dbl_valueA,dbl_valueB)          \
 268     Dallp1(dbl_valueA) = ((unsigned int)1<<31) |                \
 269          (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));    \
 270     Dmantissap2(dbl_valueB) = 0
 271 #define Dbl_setinfinity(dbl_valueA,dbl_valueB,sign)             \
 272     Dallp1(dbl_valueA) = ((unsigned int)sign << 31) |           \
 273         (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));     \
 274     Dmantissap2(dbl_valueB) = 0
 275
 276 #define Dbl_sethigh4bits(dbl_value, extsign) Deposit_dhigh4p1(dbl_value,extsign)
 277 #define Dbl_set_sign(dbl_value,sign) Deposit_dsign(dbl_value,sign)
 278 #define Dbl_invert_sign(dbl_value) Deposit_dsign(dbl_value,~Dsign(dbl_value))
 279 #define Dbl_setone_sign(dbl_value) Deposit_dsign(dbl_value,1)
 280 #define Dbl_setone_lowmantissap2(dbl_value) Deposit_dlowp2(dbl_value,1)
 281 #define Dbl_setzero_sign(dbl_value) Dallp1(dbl_value) &= 0x7fffffff
 282 #define Dbl_setzero_exponent(dbl_value)                 \
 283     Dallp1(dbl_value) &= 0x800fffff
 284 #define Dbl_setzero_mantissa(dbl_valueA,dbl_valueB)     \
 285     Dallp1(dbl_valueA) &= 0xfff00000;                   \
 286     Dallp2(dbl_valueB) = 0
 287 #define Dbl_setzero_mantissap1(dbl_value) Dallp1(dbl_value) &= 0xfff00000
 288 #define Dbl_setzero_mantissap2(dbl_value) Dallp2(dbl_value) = 0
 289 #define Dbl_setzero_exponentmantissa(dbl_valueA,dbl_valueB)     \
 290     Dallp1(dbl_valueA) &= 0x80000000;           \
 291     Dallp2(dbl_valueB) = 0
 292 #define Dbl_setzero_exponentmantissap1(dbl_valueA)      \
 293     Dallp1(dbl_valueA) &= 0x80000000
 294 #define Dbl_setzero(dbl_valueA,dbl_valueB) \
 295     Dallp1(dbl_valueA) = 0; Dallp2(dbl_valueB) = 0
 296 #define Dbl_setzerop1(dbl_value) Dallp1(dbl_value) = 0
 297 #define Dbl_setzerop2(dbl_value) Dallp2(dbl_value) = 0
 298 #define Dbl_setnegativezero(dbl_value) \
 299     Dallp1(dbl_value) = (unsigned int)1 << 31; Dallp2(dbl_value) = 0
 300 #define Dbl_setnegativezerop1(dbl_value) Dallp1(dbl_value) = (unsigned int)1<<31
 301
 302 /* Use the following macro for both overflow & underflow conditions */
 303 #define ovfl -
 304 #define unfl +
 305 #define Dbl_setwrapped_exponent(dbl_value,exponent,op) \
 306     Deposit_dexponent(dbl_value,(exponent op DBL_WRAP))
 307
 308 #define Dbl_setlargestpositive(dbl_valueA,dbl_valueB)                   \
 309     Dallp1(dbl_valueA) = ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) \
 310                         | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 );          \
 311     Dallp2(dbl_valueB) = 0xFFFFFFFF
 312 #define Dbl_setlargestnegative(dbl_valueA,dbl_valueB)                   \
 313     Dallp1(dbl_valueA) = ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) \
 314                         | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 )           \
 315                         | ((unsigned int)1<<31);                        \
 316     Dallp2(dbl_valueB) = 0xFFFFFFFF
 317 #define Dbl_setlargest_exponentmantissa(dbl_valueA,dbl_valueB)          \
 318     Deposit_dexponentmantissap1(dbl_valueA,                             \
 319         (((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH)))               \
 320                         | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 )));        \
 321     Dallp2(dbl_valueB) = 0xFFFFFFFF
 322
 323 #define Dbl_setnegativeinfinity(dbl_valueA,dbl_valueB)                  \
 324     Dallp1(dbl_valueA) = ((1<<DBL_EXP_LENGTH) | DBL_INFINITY_EXPONENT)  \
 325                          << (32-(1+DBL_EXP_LENGTH)) ;                   \
 326     Dallp2(dbl_valueB) = 0
 327 #define Dbl_setlargest(dbl_valueA,dbl_valueB,sign)                      \
 328     Dallp1(dbl_valueA) = ((unsigned int)sign << 31) |                   \
 329          ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) |             \
 330          ((1 << (32-(1+DBL_EXP_LENGTH))) - 1 );                         \
 331     Dallp2(dbl_valueB) = 0xFFFFFFFF
 332
 333
 334 /* The high bit is always zero so arithmetic or logical shifts will work. */
 335 #define Dbl_right_align(srcdstA,srcdstB,shift,extent)                   \
 336     if( shift >= 32 )                                                   \
 337         {                                                               \
 338         /* Big shift requires examining the portion shift off           \
 339         the end to properly set inexact.  */                            \
 340         if(shift < 64)                                                  \
 341             {                                                           \
 342             if(shift > 32)                                              \
 343                 {                                                       \
 344                 Variable_shift_double(Dallp1(srcdstA),Dallp2(srcdstB),  \
 345                  shift-32, Extall(extent));                             \
 346                 if(Dallp2(srcdstB) << 64 - (shift)) Ext_setone_low(extent); \
 347                 }                                                       \
 348             else Extall(extent) = Dallp2(srcdstB);                      \
 349             Dallp2(srcdstB) = Dallp1(srcdstA) >> (shift - 32);          \
 350             }                                                           \
 351         else                                                            \
 352             {                                                           \
 353             Extall(extent) = Dallp1(srcdstA);                           \
 354             if(Dallp2(srcdstB)) Ext_setone_low(extent);                 \
 355             Dallp2(srcdstB) = 0;                                        \
 356             }                                                           \
 357         Dallp1(srcdstA) = 0;                                            \
 358         }                                                               \
 359     else                                                                \
 360         {                                                               \
 361         /* Small alignment is simpler.  Extension is easily set. */     \
 362         if (shift > 0)                                                  \
 363             {                                                           \
 364             Extall(extent) = Dallp2(srcdstB) << 32 - (shift);           \
 365             Variable_shift_double(Dallp1(srcdstA),Dallp2(srcdstB),shift, \
 366              Dallp2(srcdstB));                                          \
 367             Dallp1(srcdstA) >>= shift;                                  \
 368             }                                                           \
 369         else Extall(extent) = 0;                                        \
 370         }
 371
 372 /*
 373  * Here we need to shift the result right to correct for an overshift
 374  * (due to the exponent becoming negative) during normalization.
 375  */
 376 #define Dbl_fix_overshift(srcdstA,srcdstB,shift,extent)                 \
 377             Extall(extent) = Dallp2(srcdstB) << 32 - (shift);           \
 378             Dallp2(srcdstB) = (Dallp1(srcdstA) << 32 - (shift)) |       \
 379                 (Dallp2(srcdstB) >> (shift));                           \
 380             Dallp1(srcdstA) = Dallp1(srcdstA) >> shift
 381
 382 #define Dbl_hiddenhigh3mantissa(dbl_value) Dhiddenhigh3mantissa(dbl_value)
 383 #define Dbl_hidden(dbl_value) Dhidden(dbl_value)
 384 #define Dbl_lowmantissap2(dbl_value) Dlowp2(dbl_value)
 385
 386 /* The left argument is never smaller than the right argument */
 387 #define Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb)                 \
 388     if( Dallp2(rightb) > Dallp2(leftb) ) Dallp1(lefta)--;       \
 389     Dallp2(resultb) = Dallp2(leftb) - Dallp2(rightb);           \
 390     Dallp1(resulta) = Dallp1(lefta) - Dallp1(righta)
 391
 392 /* Subtract right augmented with extension from left augmented with zeros and
 393  * store into result and extension. */
 394 #define Dbl_subtract_withextension(lefta,leftb,righta,rightb,extent,resulta,resultb)    \
 395     Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb);            \
 396     if( (Extall(extent) = 0-Extall(extent)) )                           \
 397         {                                                               \
 398         if((Dallp2(resultb)--) == 0) Dallp1(resulta)--;                 \
 399         }
 400
 401 #define Dbl_addition(lefta,leftb,righta,rightb,resulta,resultb)         \
 402     /* If the sum of the low words is less than either source, then     \
 403      * an overflow into the next word occurred. */                      \
 404     Dallp1(resulta) = Dallp1(lefta) + Dallp1(righta);                   \
 405     if((Dallp2(resultb) = Dallp2(leftb) + Dallp2(rightb)) < Dallp2(rightb)) \
 406         Dallp1(resulta)++
 407
 408 #define Dbl_xortointp1(left,right,result)                       \
 409     result = Dallp1(left) XOR Dallp1(right)
 410
 411 #define Dbl_xorfromintp1(left,right,result)                     \
 412     Dallp1(result) = left XOR Dallp1(right)
 413
 414 #define Dbl_swap_lower(left,right)                              \
 415     Dallp2(left)  = Dallp2(left) XOR Dallp2(right);             \
 416     Dallp2(right) = Dallp2(left) XOR Dallp2(right);             \
 417     Dallp2(left)  = Dallp2(left) XOR Dallp2(right)
 418
 419 /* Need to Initialize */
 420 #define Dbl_makequietnan(desta,destb)                                   \
 421     Dallp1(desta) = ((DBL_EMAX+DBL_BIAS)+1)<< (32-(1+DBL_EXP_LENGTH))   \
 422                  | (1<<(32-(1+DBL_EXP_LENGTH+2)));                      \
 423     Dallp2(destb) = 0
 424 #define Dbl_makesignalingnan(desta,destb)                               \
 425     Dallp1(desta) = ((DBL_EMAX+DBL_BIAS)+1)<< (32-(1+DBL_EXP_LENGTH))   \
 426                  | (1<<(32-(1+DBL_EXP_LENGTH+1)));                      \
 427     Dallp2(destb) = 0
 428
 429 #define Dbl_normalize(dbl_opndA,dbl_opndB,exponent)                     \
 430         while(Dbl_iszero_hiddenhigh7mantissa(dbl_opndA)) {              \
 431                 Dbl_leftshiftby8(dbl_opndA,dbl_opndB);                  \
 432                 exponent -= 8;                                          \
 433         }                                                               \
 434         if(Dbl_iszero_hiddenhigh3mantissa(dbl_opndA)) {                 \
 435                 Dbl_leftshiftby4(dbl_opndA,dbl_opndB);                  \
 436                 exponent -= 4;                                          \
 437         }                                                               \
 438         while(Dbl_iszero_hidden(dbl_opndA)) {                           \
 439                 Dbl_leftshiftby1(dbl_opndA,dbl_opndB);                  \
 440                 exponent -= 1;                                          \
 441         }
 442
 443 #define Twoword_add(src1dstA,src1dstB,src2A,src2B)              \
 444         /*                                                      \
 445          * want this macro to generate:                         \
 446          *      ADD     src1dstB,src2B,src1dstB;                \
 447          *      ADDC    src1dstA,src2A,src1dstA;                \
 448          */                                                     \
 449         if ((src1dstB) + (src2B) < (src1dstB)) Dallp1(src1dstA)++; \
 450         Dallp1(src1dstA) += (src2A);                            \
 451         Dallp2(src1dstB) += (src2B)
 452
 453 #define Twoword_subtract(src1dstA,src1dstB,src2A,src2B)         \
 454         /*                                                      \
 455          * want this macro to generate:                         \
 456          *      SUB     src1dstB,src2B,src1dstB;                \
 457          *      SUBB    src1dstA,src2A,src1dstA;                \
 458          */                                                     \
 459         if ((src1dstB) < (src2B)) Dallp1(src1dstA)--;           \
 460         Dallp1(src1dstA) -= (src2A);                            \
 461         Dallp2(src1dstB) -= (src2B)
 462
 463 #define Dbl_setoverflow(resultA,resultB)                                \
 464         /* set result to infinity or largest number */                  \
 465         switch (Rounding_mode()) {                                      \
 466                 case ROUNDPLUS:                                         \
 467                         if (Dbl_isone_sign(resultA)) {                  \
 468                                 Dbl_setlargestnegative(resultA,resultB); \
 469                         }                                               \
 470                         else {                                          \
 471                                 Dbl_setinfinitypositive(resultA,resultB); \
 472                         }                                               \
 473                         break;                                          \
 474                 case ROUNDMINUS:                                        \
 475                         if (Dbl_iszero_sign(resultA)) {                 \
 476                                 Dbl_setlargestpositive(resultA,resultB); \
 477                         }                                               \
 478                         else {                                          \
 479                                 Dbl_setinfinitynegative(resultA,resultB); \
 480                         }                                               \
 481                         break;                                          \
 482                 case ROUNDNEAREST:                                      \
 483                         Dbl_setinfinity_exponentmantissa(resultA,resultB); \
 484                         break;                                          \
 485                 case ROUNDZERO:                                         \
 486                         Dbl_setlargest_exponentmantissa(resultA,resultB); \
 487         }
 488
 489 #define Dbl_denormalize(opndp1,opndp2,exponent,guard,sticky,inexact)    \
 490     Dbl_clear_signexponent_set_hidden(opndp1);                          \
 491     if (exponent >= (1-DBL_P)) {                                        \
 492         if (exponent >= -31) {                                          \
 493             guard = (Dallp2(opndp2) >> -exponent) & 1;                  \
 494             if (exponent < 0) sticky |= Dallp2(opndp2) << (32+exponent); \
 495             if (exponent > -31) {                                       \
 496                 Variable_shift_double(opndp1,opndp2,1-exponent,opndp2); \
 497                 Dallp1(opndp1) >>= 1-exponent;                          \
 498             }                                                           \
 499             else {                                                      \
 500                 Dallp2(opndp2) = Dallp1(opndp1);                        \
 501                 Dbl_setzerop1(opndp1);                                  \
 502             }                                                           \
 503         }                                                               \
 504         else {                                                          \
 505             guard = (Dallp1(opndp1) >> -32-exponent) & 1;               \
 506             if (exponent == -32) sticky |= Dallp2(opndp2);              \
 507             else sticky |= (Dallp2(opndp2) | Dallp1(opndp1) << 64+exponent); \
 508             Dallp2(opndp2) = Dallp1(opndp1) >> -31-exponent;            \
 509             Dbl_setzerop1(opndp1);                                      \
 510         }                                                               \
 511         inexact = guard | sticky;                                       \
 512     }                                                                   \
 513     else {                                                              \
 514         guard = 0;                                                      \
 515         sticky |= (Dallp1(opndp1) | Dallp2(opndp2));                    \
 516         Dbl_setzero(opndp1,opndp2);                                     \
 517         inexact = sticky;                                               \
 518     }
 519
 520 /*
 521  * The fused multiply add instructions requires a double extended format,
 522  * with 106 bits of mantissa.
 523  */
 524 #define DBLEXT_THRESHOLD 106
 525
 526 #define Dblext_setzero(valA,valB,valC,valD)     \
 527     Dextallp1(valA) = 0; Dextallp2(valB) = 0;   \
 528     Dextallp3(valC) = 0; Dextallp4(valD) = 0
 529
 530
 531 #define Dblext_isnotzero_mantissap3(valC) (Dextallp3(valC)!=0)
 532 #define Dblext_isnotzero_mantissap4(valD) (Dextallp3(valD)!=0)
 533 #define Dblext_isone_lowp2(val) (Dextlowp2(val)!=0)
 534 #define Dblext_isone_highp3(val) (Dexthighp3(val)!=0)
 535 #define Dblext_isnotzero_low31p3(val) (Dextlow31p3(val)!=0)
 536 #define Dblext_iszero(valA,valB,valC,valD) (Dextallp1(valA)==0 && \
 537     Dextallp2(valB)==0 && Dextallp3(valC)==0 && Dextallp4(valD)==0)
 538
 539 #define Dblext_copy(srca,srcb,srcc,srcd,desta,destb,destc,destd) \
 540     Dextallp1(desta) = Dextallp4(srca); \
 541     Dextallp2(destb) = Dextallp4(srcb); \
 542     Dextallp3(destc) = Dextallp4(srcc); \
 543     Dextallp4(destd) = Dextallp4(srcd)
 544
 545 #define Dblext_swap_lower(leftp2,leftp3,leftp4,rightp2,rightp3,rightp4)  \
 546     Dextallp2(leftp2)  = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
 547     Dextallp2(rightp2) = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
 548     Dextallp2(leftp2)  = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
 549     Dextallp3(leftp3)  = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
 550     Dextallp3(rightp3) = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
 551     Dextallp3(leftp3)  = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
 552     Dextallp4(leftp4)  = Dextallp4(leftp4) XOR Dextallp4(rightp4);  \
 553     Dextallp4(rightp4) = Dextallp4(leftp4) XOR Dextallp4(rightp4);  \
 554     Dextallp4(leftp4)  = Dextallp4(leftp4) XOR Dextallp4(rightp4)
 555
 556 #define Dblext_setone_lowmantissap4(dbl_value) Deposit_dextlowp4(dbl_value,1)
 557
 558 /* The high bit is always zero so arithmetic or logical shifts will work. */
 559 #define Dblext_right_align(srcdstA,srcdstB,srcdstC,srcdstD,shift) \
 560   {int shiftamt, sticky;                                                \
 561     shiftamt = shift % 32;                                              \
 562     sticky = 0;                                                         \
 563     switch (shift/32) {                                                 \
 564      case 0: if (shiftamt > 0) {                                        \
 565                 sticky = Dextallp4(srcdstD) << 32 - (shiftamt);         \
 566                 Variable_shift_double(Dextallp3(srcdstC),               \
 567                  Dextallp4(srcdstD),shiftamt,Dextallp4(srcdstD));       \
 568                 Variable_shift_double(Dextallp2(srcdstB),               \
 569                  Dextallp3(srcdstC),shiftamt,Dextallp3(srcdstC));       \
 570                 Variable_shift_double(Dextallp1(srcdstA),               \
 571                  Dextallp2(srcdstB),shiftamt,Dextallp2(srcdstB));       \
 572                 Dextallp1(srcdstA) >>= shiftamt;                        \
 573              }                                                          \
 574              break;                                                     \
 575      case 1: if (shiftamt > 0) {                                        \
 576                 sticky = (Dextallp3(srcdstC) << 31 - shiftamt) |        \
 577                          Dextallp4(srcdstD);                            \
 578                 Variable_shift_double(Dextallp2(srcdstB),               \
 579                  Dextallp3(srcdstC),shiftamt,Dextallp4(srcdstD));       \
 580                 Variable_shift_double(Dextallp1(srcdstA),               \
 581                  Dextallp2(srcdstB),shiftamt,Dextallp3(srcdstC));       \
 582              }                                                          \
 583              else {                                                     \
 584                 sticky = Dextallp4(srcdstD);                            \
 585                 Dextallp4(srcdstD) = Dextallp3(srcdstC);                \
 586                 Dextallp3(srcdstC) = Dextallp2(srcdstB);                \
 587              }                                                          \
 588              Dextallp2(srcdstB) = Dextallp1(srcdstA) >> shiftamt;       \
 589              Dextallp1(srcdstA) = 0;                                    \
 590              break;                                                     \
 591      case 2: if (shiftamt > 0) {                                        \
 592                 sticky = (Dextallp2(srcdstB) << 31 - shiftamt) |        \
 593                          Dextallp3(srcdstC) | Dextallp4(srcdstD);       \
 594                 Variable_shift_double(Dextallp1(srcdstA),               \
 595                  Dextallp2(srcdstB),shiftamt,Dextallp4(srcdstD));       \
 596              }                                                          \
 597              else {                                                     \
 598                 sticky = Dextallp3(srcdstC) | Dextallp4(srcdstD);       \
 599                 Dextallp4(srcdstD) = Dextallp2(srcdstB);                \
 600              }                                                          \
 601              Dextallp3(srcdstC) = Dextallp1(srcdstA) >> shiftamt;       \
 602              Dextallp1(srcdstA) = Dextallp2(srcdstB) = 0;               \
 603              break;                                                     \
 604      case 3: if (shiftamt > 0) {                                        \
 605                 sticky = (Dextallp1(srcdstA) << 31 - shiftamt) |        \
 606                          Dextallp2(srcdstB) | Dextallp3(srcdstC) |      \
 607                          Dextallp4(srcdstD);                            \
 608              }                                                          \
 609              else {                                                     \
 610                 sticky = Dextallp2(srcdstB) | Dextallp3(srcdstC) |      \
 611                     Dextallp4(srcdstD);                                 \
 612              }                                                          \
 613              Dextallp4(srcdstD) = Dextallp1(srcdstA) >> shiftamt;       \
 614              Dextallp1(srcdstA) = Dextallp2(srcdstB) = 0;               \
 615              Dextallp3(srcdstC) = 0;                                    \
 616              break;                                                     \
 617     }                                                                   \
 618     if (sticky) Dblext_setone_lowmantissap4(srcdstD);                   \
 619   }
 620
 621 /* The left argument is never smaller than the right argument */
 622 #define Dblext_subtract(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc,resultd) \
 623     if( Dextallp4(rightd) > Dextallp4(leftd) )                  \
 624         if( (Dextallp3(leftc)--) == 0)                          \
 625             if( (Dextallp2(leftb)--) == 0) Dextallp1(lefta)--;  \
 626     Dextallp4(resultd) = Dextallp4(leftd) - Dextallp4(rightd);  \
 627     if( Dextallp3(rightc) > Dextallp3(leftc) )                  \
 628         if( (Dextallp2(leftb)--) == 0) Dextallp1(lefta)--;      \
 629     Dextallp3(resultc) = Dextallp3(leftc) - Dextallp3(rightc);  \
 630     if( Dextallp2(rightb) > Dextallp2(leftb) ) Dextallp1(lefta)--; \
 631     Dextallp2(resultb) = Dextallp2(leftb) - Dextallp2(rightb);  \
 632     Dextallp1(resulta) = Dextallp1(lefta) - Dextallp1(righta)
 633
 634 #define Dblext_addition(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc,resultd) \
 635     /* If the sum of the low words is less than either source, then \
 636      * an overflow into the next word occurred. */ \
 637     if ((Dextallp4(resultd) = Dextallp4(leftd)+Dextallp4(rightd)) < \
 638         Dextallp4(rightd)) \
 639         if((Dextallp3(resultc) = Dextallp3(leftc)+Dextallp3(rightc)+1) <= \
 640             Dextallp3(rightc)) \
 641             if((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)+1) \
 642                 <= Dextallp2(rightb))  \
 643                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
 644             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
 645         else \
 646             if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)) < \
 647                 Dextallp2(rightb)) \
 648                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
 649             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
 650     else \
 651         if ((Dextallp3(resultc) = Dextallp3(leftc)+Dextallp3(rightc)) < \
 652             Dextallp3(rightc))  \
 653             if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)+1) \
 654                 <= Dextallp2(rightb)) \
 655                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
 656             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
 657         else \
 658             if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)) < \
 659                 Dextallp2(rightb)) \
 660                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
 661             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)
 662
 663
 664 #define Dblext_arithrightshiftby1(srcdstA,srcdstB,srcdstC,srcdstD)      \
 665     Shiftdouble(Dextallp3(srcdstC),Dextallp4(srcdstD),1,Dextallp4(srcdstD)); \
 666     Shiftdouble(Dextallp2(srcdstB),Dextallp3(srcdstC),1,Dextallp3(srcdstC)); \
 667     Shiftdouble(Dextallp1(srcdstA),Dextallp2(srcdstB),1,Dextallp2(srcdstB)); \
 668     Dextallp1(srcdstA) = (int)Dextallp1(srcdstA) >> 1
 669
 670 #define Dblext_leftshiftby8(valA,valB,valC,valD) \
 671     Shiftdouble(Dextallp1(valA),Dextallp2(valB),24,Dextallp1(valA)); \
 672     Shiftdouble(Dextallp2(valB),Dextallp3(valC),24,Dextallp2(valB)); \
 673     Shiftdouble(Dextallp3(valC),Dextallp4(valD),24,Dextallp3(valC)); \
 674     Dextallp4(valD) <<= 8
 675 #define Dblext_leftshiftby4(valA,valB,valC,valD) \
 676     Shiftdouble(Dextallp1(valA),Dextallp2(valB),28,Dextallp1(valA)); \
 677     Shiftdouble(Dextallp2(valB),Dextallp3(valC),28,Dextallp2(valB)); \
 678     Shiftdouble(Dextallp3(valC),Dextallp4(valD),28,Dextallp3(valC)); \
 679     Dextallp4(valD) <<= 4
 680 #define Dblext_leftshiftby3(valA,valB,valC,valD) \
 681     Shiftdouble(Dextallp1(valA),Dextallp2(valB),29,Dextallp1(valA)); \
 682     Shiftdouble(Dextallp2(valB),Dextallp3(valC),29,Dextallp2(valB)); \
 683     Shiftdouble(Dextallp3(valC),Dextallp4(valD),29,Dextallp3(valC)); \
 684     Dextallp4(valD) <<= 3
 685 #define Dblext_leftshiftby2(valA,valB,valC,valD) \
 686     Shiftdouble(Dextallp1(valA),Dextallp2(valB),30,Dextallp1(valA)); \
 687     Shiftdouble(Dextallp2(valB),Dextallp3(valC),30,Dextallp2(valB)); \
 688     Shiftdouble(Dextallp3(valC),Dextallp4(valD),30,Dextallp3(valC)); \
 689     Dextallp4(valD) <<= 2
 690 #define Dblext_leftshiftby1(valA,valB,valC,valD) \
 691     Shiftdouble(Dextallp1(valA),Dextallp2(valB),31,Dextallp1(valA)); \
 692     Shiftdouble(Dextallp2(valB),Dextallp3(valC),31,Dextallp2(valB)); \
 693     Shiftdouble(Dextallp3(valC),Dextallp4(valD),31,Dextallp3(valC)); \
 694     Dextallp4(valD) <<= 1
 695
 696 #define Dblext_rightshiftby4(valueA,valueB,valueC,valueD) \
 697     Shiftdouble(Dextallp3(valueC),Dextallp4(valueD),4,Dextallp4(valueD)); \
 698     Shiftdouble(Dextallp2(valueB),Dextallp3(valueC),4,Dextallp3(valueC)); \
 699     Shiftdouble(Dextallp1(valueA),Dextallp2(valueB),4,Dextallp2(valueB)); \
 700     Dextallp1(valueA) >>= 4
 701 #define Dblext_rightshiftby1(valueA,valueB,valueC,valueD) \
 702     Shiftdouble(Dextallp3(valueC),Dextallp4(valueD),1,Dextallp4(valueD)); \
 703     Shiftdouble(Dextallp2(valueB),Dextallp3(valueC),1,Dextallp3(valueC)); \
 704     Shiftdouble(Dextallp1(valueA),Dextallp2(valueB),1,Dextallp2(valueB)); \
 705     Dextallp1(valueA) >>= 1
 706
 707 #define Dblext_xortointp1(left,right,result) Dbl_xortointp1(left,right,result)
 708
 709 #define Dblext_xorfromintp1(left,right,result) \
 710         Dbl_xorfromintp1(left,right,result)
 711
 712 #define Dblext_copytoint_exponentmantissap1(src,dest) \
 713         Dbl_copytoint_exponentmantissap1(src,dest)
 714
 715 #define Dblext_ismagnitudeless(leftB,rightB,signlessleft,signlessright) \
 716         Dbl_ismagnitudeless(leftB,rightB,signlessleft,signlessright)
 717
 718 #define Dbl_copyto_dblext(src1,src2,dest1,dest2,dest3,dest4) \
 719         Dextallp1(dest1) = Dallp1(src1); Dextallp2(dest2) = Dallp2(src2); \
 720         Dextallp3(dest3) = 0; Dextallp4(dest4) = 0
 721
 722 #define Dblext_set_sign(dbl_value,sign)  Dbl_set_sign(dbl_value,sign)
 723 #define Dblext_clear_signexponent_set_hidden(srcdst) \
 724         Dbl_clear_signexponent_set_hidden(srcdst)
 725 #define Dblext_clear_signexponent(srcdst) Dbl_clear_signexponent(srcdst)
 726 #define Dblext_clear_sign(srcdst) Dbl_clear_sign(srcdst)
 727 #define Dblext_isone_hidden(dbl_value) Dbl_isone_hidden(dbl_value)
 728
 729 /*
 730  * The Fourword_add() macro assumes that integers are 4 bytes in size.
 731  * It will break if this is not the case.
 732  */
 733
 734 #define Fourword_add(src1dstA,src1dstB,src1dstC,src1dstD,src2A,src2B,src2C,src2D) \
 735         /*                                                              \
 736          * want this macro to generate:                                 \
 737          *      ADD     src1dstD,src2D,src1dstD;                        \
 738          *      ADDC    src1dstC,src2C,src1dstC;                        \
 739          *      ADDC    src1dstB,src2B,src1dstB;                        \
 740          *      ADDC    src1dstA,src2A,src1dstA;                        \
 741          */                                                             \
 742         if ((unsigned int)(src1dstD += (src2D)) < (unsigned int)(src2D)) { \
 743            if ((unsigned int)(src1dstC += (src2C) + 1) <=               \
 744                (unsigned int)(src2C)) {                                 \
 745              if ((unsigned int)(src1dstB += (src2B) + 1) <=             \
 746                  (unsigned int)(src2B)) src1dstA++;                     \
 747            }                                                            \
 748            else if ((unsigned int)(src1dstB += (src2B)) <               \
 749                     (unsigned int)(src2B)) src1dstA++;                  \
 750         }                                                               \
 751         else {                                                          \
 752            if ((unsigned int)(src1dstC += (src2C)) <                    \
 753                (unsigned int)(src2C)) {                                 \
 754               if ((unsigned int)(src1dstB += (src2B) + 1) <=            \
 755                   (unsigned int)(src2B)) src1dstA++;                    \
 756            }                                                            \
 757            else if ((unsigned int)(src1dstB += (src2B)) <               \
 758                     (unsigned int)(src2B)) src1dstA++;                  \
 759         }                                                               \
 760         src1dstA += (src2A)
 761
 762 #define Dblext_denormalize(opndp1,opndp2,opndp3,opndp4,exponent,is_tiny) \
 763   {int shiftamt, sticky;                                                \
 764     is_tiny = TRUE;                                                     \
 765     if (exponent == 0 && (Dextallp3(opndp3) || Dextallp4(opndp4))) {    \
 766         switch (Rounding_mode()) {                                      \
 767         case ROUNDPLUS:                                                 \
 768                 if (Dbl_iszero_sign(opndp1)) {                          \
 769                         Dbl_increment(opndp1,opndp2);                   \
 770                         if (Dbl_isone_hiddenoverflow(opndp1))           \
 771                                 is_tiny = FALSE;                        \
 772                         Dbl_decrement(opndp1,opndp2);                   \
 773                 }                                                       \
 774                 break;                                                  \
 775         case ROUNDMINUS:                                                \
 776                 if (Dbl_isone_sign(opndp1)) {                           \
 777                         Dbl_increment(opndp1,opndp2);                   \
 778                         if (Dbl_isone_hiddenoverflow(opndp1))           \
 779                                 is_tiny = FALSE;                        \
 780                         Dbl_decrement(opndp1,opndp2);                   \
 781                 }                                                       \
 782                 break;                                                  \
 783         case ROUNDNEAREST:                                              \
 784                 if (Dblext_isone_highp3(opndp3) &&                      \
 785                     (Dblext_isone_lowp2(opndp2) ||                      \
 786                      Dblext_isnotzero_low31p3(opndp3))) {               \
 787                         Dbl_increment(opndp1,opndp2);                   \
 788                         if (Dbl_isone_hiddenoverflow(opndp1))           \
 789                                 is_tiny = FALSE;                        \
 790                         Dbl_decrement(opndp1,opndp2);                   \
 791                 }                                                       \
 792                 break;                                                  \
 793         }                                                               \
 794     }                                                                   \
 795     Dblext_clear_signexponent_set_hidden(opndp1);                       \
 796     if (exponent >= (1-QUAD_P)) {                                       \
 797         shiftamt = (1-exponent) % 32;                                   \
 798         switch((1-exponent)/32) {                                       \
 799           case 0: sticky = Dextallp4(opndp4) << 32-(shiftamt);          \
 800                   Variableshiftdouble(opndp3,opndp4,shiftamt,opndp4);   \
 801                   Variableshiftdouble(opndp2,opndp3,shiftamt,opndp3);   \
 802                   Variableshiftdouble(opndp1,opndp2,shiftamt,opndp2);   \
 803                   Dextallp1(opndp1) >>= shiftamt;                       \
 804                   break;                                                \
 805           case 1: sticky = (Dextallp3(opndp3) << 32-(shiftamt)) |       \
 806                            Dextallp4(opndp4);                           \
 807                   Variableshiftdouble(opndp2,opndp3,shiftamt,opndp4);   \
 808                   Variableshiftdouble(opndp1,opndp2,shiftamt,opndp3);   \
 809                   Dextallp2(opndp2) = Dextallp1(opndp1) >> shiftamt;    \
 810                   Dextallp1(opndp1) = 0;                                \
 811                   break;                                                \
 812           case 2: sticky = (Dextallp2(opndp2) << 32-(shiftamt)) |       \
 813                             Dextallp3(opndp3) | Dextallp4(opndp4);      \
 814                   Variableshiftdouble(opndp1,opndp2,shiftamt,opndp4);   \
 815                   Dextallp3(opndp3) = Dextallp1(opndp1) >> shiftamt;    \
 816                   Dextallp1(opndp1) = Dextallp2(opndp2) = 0;            \
 817                   break;                                                \
 818           case 3: sticky = (Dextallp1(opndp1) << 32-(shiftamt)) |       \
 819                         Dextallp2(opndp2) | Dextallp3(opndp3) |         \
 820                         Dextallp4(opndp4);                              \
 821                   Dextallp4(opndp4) = Dextallp1(opndp1) >> shiftamt;    \
 822                   Dextallp1(opndp1) = Dextallp2(opndp2) = 0;            \
 823                   Dextallp3(opndp3) = 0;                                \
 824                   break;                                                \
 825         }                                                               \
 826     }                                                                   \
 827     else {                                                              \
 828         sticky = Dextallp1(opndp1) | Dextallp2(opndp2) |                \
 829                  Dextallp3(opndp3) | Dextallp4(opndp4);                 \
 830         Dblext_setzero(opndp1,opndp2,opndp3,opndp4);                    \
 831     }                                                                   \
 832     if (sticky) Dblext_setone_lowmantissap4(opndp4);                    \
 833     exponent = 0;                                                       \
 834   }