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dbl_float.h

/*
 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
 *
 * Floating-point emulation code
 *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifdef __NO_PA_HDRS
    PA header file -- do not include this header file for non-PA builds.
#endif

/* 32-bit word grabbing functions */
#define Dbl_firstword(value) Dallp1(value)
#define Dbl_secondword(value) Dallp2(value)
#define Dbl_thirdword(value) dummy_location
#define Dbl_fourthword(value) dummy_location

#define Dbl_sign(object) Dsign(object)
#define Dbl_exponent(object) Dexponent(object)
#define Dbl_signexponent(object) Dsignexponent(object)
#define Dbl_mantissap1(object) Dmantissap1(object)
#define Dbl_mantissap2(object) Dmantissap2(object)
#define Dbl_exponentmantissap1(object) Dexponentmantissap1(object)
#define Dbl_allp1(object) Dallp1(object)
#define Dbl_allp2(object) Dallp2(object)

/* dbl_and_signs ANDs the sign bits of each argument and puts the result
 * into the first argument. dbl_or_signs ors those same sign bits */
#define Dbl_and_signs( src1dst, src2)           \
    Dallp1(src1dst) = (Dallp1(src2)|~((unsigned int)1<<31)) & Dallp1(src1dst)
#define Dbl_or_signs( src1dst, src2)            \
    Dallp1(src1dst) = (Dallp1(src2)&((unsigned int)1<<31)) | Dallp1(src1dst)

/* The hidden bit is always the low bit of the exponent */
#define Dbl_clear_exponent_set_hidden(srcdst) Deposit_dexponent(srcdst,1)
#define Dbl_clear_signexponent_set_hidden(srcdst) \
    Deposit_dsignexponent(srcdst,1)
#define Dbl_clear_sign(srcdst) Dallp1(srcdst) &= ~((unsigned int)1<<31)
#define Dbl_clear_signexponent(srcdst) \
    Dallp1(srcdst) &= Dmantissap1((unsigned int)-1)

/* Exponent field for doubles has already been cleared and may be
 * included in the shift.  Here we need to generate two double width
 * variable shifts.  The insignificant bits can be ignored.
 *      MTSAR f(varamount)
 *      VSHD      srcdst.high,srcdst.low => srcdst.low
 *    VSHD  0,srcdst.high => srcdst.high 
 * This is very difficult to model with C expressions since the shift amount
 * could exceed 32.  */
/* varamount must be less than 64 */
#define Dbl_rightshift(srcdstA, srcdstB, varamount)               \
    {if((varamount) >= 32) {                                \
        Dallp2(srcdstB) = Dallp1(srcdstA) >> (varamount-32);            \
        Dallp1(srcdstA)=0;                                  \
    }                                                 \
    else if(varamount > 0) {                                \
      Variable_shift_double(Dallp1(srcdstA), Dallp2(srcdstB),     \
        (varamount), Dallp2(srcdstB));                      \
      Dallp1(srcdstA) >>= varamount;                              \
    } }
/* varamount must be less than 64 */
#define Dbl_rightshift_exponentmantissa(srcdstA, srcdstB, varamount)    \
    {if((varamount) >= 32) {                                \
        Dallp2(srcdstB) = Dexponentmantissap1(srcdstA) >> (varamount-32); \
      Dallp1(srcdstA) &= ((unsigned int)1<<31);  /* clear expmant field */ \
    }                                                 \
    else if(varamount > 0) {                                \
      Variable_shift_double(Dexponentmantissap1(srcdstA), Dallp2(srcdstB), \
      (varamount), Dallp2(srcdstB));                              \
      Deposit_dexponentmantissap1(srcdstA,                        \
          (Dexponentmantissap1(srcdstA)>>varamount));             \
    } }
/* varamount must be less than 64 */
#define Dbl_leftshift(srcdstA, srcdstB, varamount)                \
    {if((varamount) >= 32) {                                \
      Dallp1(srcdstA) = Dallp2(srcdstB) << (varamount-32);        \
      Dallp2(srcdstB)=0;                                    \
    }                                                 \
    else {                                            \
      if ((varamount) > 0) {                                \
          Dallp1(srcdstA) = (Dallp1(srcdstA) << (varamount)) |    \
            (Dallp2(srcdstB) >> (32-(varamount)));                \
          Dallp2(srcdstB) <<= varamount;                    \
      }                                               \
    } }
#define Dbl_leftshiftby1_withextent(lefta,leftb,right,resulta,resultb)  \
    Shiftdouble(Dallp1(lefta), Dallp2(leftb), 31, Dallp1(resulta));     \
    Shiftdouble(Dallp2(leftb), Extall(right), 31, Dallp2(resultb)) 
    
#define Dbl_rightshiftby1_withextent(leftb,right,dst)       \
    Extall(dst) = (Dallp2(leftb) << 31) | ((unsigned int)Extall(right) >> 1) | \
              Extlow(right)

#define Dbl_arithrightshiftby1(srcdstA,srcdstB)             \
    Shiftdouble(Dallp1(srcdstA),Dallp2(srcdstB),1,Dallp2(srcdstB));\
    Dallp1(srcdstA) = (int)Dallp1(srcdstA) >> 1
   
/* Sign extend the sign bit with an integer destination */
#define Dbl_signextendedsign(value)  Dsignedsign(value)

#define Dbl_isone_hidden(dbl_value) (Is_dhidden(dbl_value)!=0)
/* Singles and doubles may include the sign and exponent fields.  The
 * hidden bit and the hidden overflow must be included. */
#define Dbl_increment(dbl_valueA,dbl_valueB) \
    if( (Dallp2(dbl_valueB) += 1) == 0 )  Dallp1(dbl_valueA) += 1
#define Dbl_increment_mantissa(dbl_valueA,dbl_valueB) \
    if( (Dmantissap2(dbl_valueB) += 1) == 0 )  \
    Deposit_dmantissap1(dbl_valueA,dbl_valueA+1)
#define Dbl_decrement(dbl_valueA,dbl_valueB) \
    if( Dallp2(dbl_valueB) == 0 )  Dallp1(dbl_valueA) -= 1; \
    Dallp2(dbl_valueB) -= 1

#define Dbl_isone_sign(dbl_value) (Is_dsign(dbl_value)!=0)
#define Dbl_isone_hiddenoverflow(dbl_value) (Is_dhiddenoverflow(dbl_value)!=0)
#define Dbl_isone_lowmantissap1(dbl_valueA) (Is_dlowp1(dbl_valueA)!=0)
#define Dbl_isone_lowmantissap2(dbl_valueB) (Is_dlowp2(dbl_valueB)!=0)
#define Dbl_isone_signaling(dbl_value) (Is_dsignaling(dbl_value)!=0)
#define Dbl_is_signalingnan(dbl_value) (Dsignalingnan(dbl_value)==0xfff)
#define Dbl_isnotzero(dbl_valueA,dbl_valueB) \
    (Dallp1(dbl_valueA) || Dallp2(dbl_valueB))
#define Dbl_isnotzero_hiddenhigh7mantissa(dbl_value) \
    (Dhiddenhigh7mantissa(dbl_value)!=0)
#define Dbl_isnotzero_exponent(dbl_value) (Dexponent(dbl_value)!=0)
#define Dbl_isnotzero_mantissa(dbl_valueA,dbl_valueB) \
    (Dmantissap1(dbl_valueA) || Dmantissap2(dbl_valueB))
#define Dbl_isnotzero_mantissap1(dbl_valueA) (Dmantissap1(dbl_valueA)!=0)
#define Dbl_isnotzero_mantissap2(dbl_valueB) (Dmantissap2(dbl_valueB)!=0)
#define Dbl_isnotzero_exponentmantissa(dbl_valueA,dbl_valueB) \
    (Dexponentmantissap1(dbl_valueA) || Dmantissap2(dbl_valueB))
#define Dbl_isnotzero_low4p2(dbl_value) (Dlow4p2(dbl_value)!=0)
#define Dbl_iszero(dbl_valueA,dbl_valueB) (Dallp1(dbl_valueA)==0 && \
    Dallp2(dbl_valueB)==0)
#define Dbl_iszero_allp1(dbl_value) (Dallp1(dbl_value)==0)
#define Dbl_iszero_allp2(dbl_value) (Dallp2(dbl_value)==0)
#define Dbl_iszero_hidden(dbl_value) (Is_dhidden(dbl_value)==0)
#define Dbl_iszero_hiddenoverflow(dbl_value) (Is_dhiddenoverflow(dbl_value)==0)
#define Dbl_iszero_hiddenhigh3mantissa(dbl_value) \
    (Dhiddenhigh3mantissa(dbl_value)==0)
#define Dbl_iszero_hiddenhigh7mantissa(dbl_value) \
    (Dhiddenhigh7mantissa(dbl_value)==0)
#define Dbl_iszero_sign(dbl_value) (Is_dsign(dbl_value)==0)
#define Dbl_iszero_exponent(dbl_value) (Dexponent(dbl_value)==0)
#define Dbl_iszero_mantissa(dbl_valueA,dbl_valueB) \
    (Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
#define Dbl_iszero_exponentmantissa(dbl_valueA,dbl_valueB) \
    (Dexponentmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
#define Dbl_isinfinity_exponent(dbl_value)            \
    (Dexponent(dbl_value)==DBL_INFINITY_EXPONENT)
#define Dbl_isnotinfinity_exponent(dbl_value)         \
    (Dexponent(dbl_value)!=DBL_INFINITY_EXPONENT)
#define Dbl_isinfinity(dbl_valueA,dbl_valueB)               \
    (Dexponent(dbl_valueA)==DBL_INFINITY_EXPONENT &&  \
    Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
#define Dbl_isnan(dbl_valueA,dbl_valueB)        \
    (Dexponent(dbl_valueA)==DBL_INFINITY_EXPONENT &&  \
    (Dmantissap1(dbl_valueA)!=0 || Dmantissap2(dbl_valueB)!=0))
#define Dbl_isnotnan(dbl_valueA,dbl_valueB)           \
    (Dexponent(dbl_valueA)!=DBL_INFINITY_EXPONENT ||  \
    (Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0))

#define Dbl_islessthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b) \
    (Dallp1(dbl_op1a) < Dallp1(dbl_op2a) ||                 \
     (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&               \
      Dallp2(dbl_op1b) < Dallp2(dbl_op2b)))
#define Dbl_isgreaterthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)    \
    (Dallp1(dbl_op1a) > Dallp1(dbl_op2a) ||                 \
     (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&               \
      Dallp2(dbl_op1b) > Dallp2(dbl_op2b)))
#define Dbl_isnotlessthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)    \
    (Dallp1(dbl_op1a) > Dallp1(dbl_op2a) ||                 \
     (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&               \
      Dallp2(dbl_op1b) >= Dallp2(dbl_op2b)))
#define Dbl_isnotgreaterthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b) \
    (Dallp1(dbl_op1a) < Dallp1(dbl_op2a) ||                 \
     (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&               \
      Dallp2(dbl_op1b) <= Dallp2(dbl_op2b)))
#define Dbl_isequal(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)    \
     ((Dallp1(dbl_op1a) == Dallp1(dbl_op2a)) &&             \
      (Dallp2(dbl_op1b) == Dallp2(dbl_op2b)))

#define Dbl_leftshiftby8(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),24,Dallp1(dbl_valueA)); \
    Dallp2(dbl_valueB) <<= 8
#define Dbl_leftshiftby7(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),25,Dallp1(dbl_valueA)); \
    Dallp2(dbl_valueB) <<= 7
#define Dbl_leftshiftby4(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),28,Dallp1(dbl_valueA)); \
    Dallp2(dbl_valueB) <<= 4
#define Dbl_leftshiftby3(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),29,Dallp1(dbl_valueA)); \
    Dallp2(dbl_valueB) <<= 3
#define Dbl_leftshiftby2(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),30,Dallp1(dbl_valueA)); \
    Dallp2(dbl_valueB) <<= 2
#define Dbl_leftshiftby1(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),31,Dallp1(dbl_valueA)); \
    Dallp2(dbl_valueB) <<= 1

#define Dbl_rightshiftby8(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),8,Dallp2(dbl_valueB)); \
    Dallp1(dbl_valueA) >>= 8
#define Dbl_rightshiftby4(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),4,Dallp2(dbl_valueB)); \
    Dallp1(dbl_valueA) >>= 4
#define Dbl_rightshiftby2(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),2,Dallp2(dbl_valueB)); \
    Dallp1(dbl_valueA) >>= 2
#define Dbl_rightshiftby1(dbl_valueA,dbl_valueB) \
    Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),1,Dallp2(dbl_valueB)); \
    Dallp1(dbl_valueA) >>= 1
    
/* This magnitude comparison uses the signless first words and
 * the regular part2 words.  The comparison is graphically:
 *
 *       1st greater?  -------------
 *                                 |
 *       1st less?-----------------+---------
 *                                 |        |
 *       2nd greater or equal----->|        |
 *                               False     True
 */
#define Dbl_ismagnitudeless(leftB,rightB,signlessleft,signlessright)    \
      ((signlessleft <= signlessright) &&                   \
       ( (signlessleft < signlessright) || (Dallp2(leftB)<Dallp2(rightB)) ))
    
#define Dbl_copytoint_exponentmantissap1(src,dest) \
    dest = Dexponentmantissap1(src)

/* A quiet NaN has the high mantissa bit clear and at least on other (in this
 * case the adjacent bit) bit set. */
#define Dbl_set_quiet(dbl_value) Deposit_dhigh2mantissa(dbl_value,1)
#define Dbl_set_exponent(dbl_value, exp) Deposit_dexponent(dbl_value,exp)

#define Dbl_set_mantissa(desta,destb,valuea,valueb)   \
    Deposit_dmantissap1(desta,valuea);                \
    Dmantissap2(destb) = Dmantissap2(valueb)
#define Dbl_set_mantissap1(desta,valuea)        \
    Deposit_dmantissap1(desta,valuea)
#define Dbl_set_mantissap2(destb,valueb)        \
    Dmantissap2(destb) = Dmantissap2(valueb)

#define Dbl_set_exponentmantissa(desta,destb,valuea,valueb) \
    Deposit_dexponentmantissap1(desta,valuea);              \
    Dmantissap2(destb) = Dmantissap2(valueb)
#define Dbl_set_exponentmantissap1(dest,value)              \
    Deposit_dexponentmantissap1(dest,value)

#define Dbl_copyfromptr(src,desta,destb) \
    Dallp1(desta) = src->wd0;       \
    Dallp2(destb) = src->wd1 
#define Dbl_copytoptr(srca,srcb,dest)     \
    dest->wd0 = Dallp1(srca);       \
    dest->wd1 = Dallp2(srcb)

/*  An infinity is represented with the max exponent and a zero mantissa */
#define Dbl_setinfinity_exponent(dbl_value) \
    Deposit_dexponent(dbl_value,DBL_INFINITY_EXPONENT)
#define Dbl_setinfinity_exponentmantissa(dbl_valueA,dbl_valueB)   \
    Deposit_dexponentmantissap1(dbl_valueA,                 \
    (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH))));    \
    Dmantissap2(dbl_valueB) = 0
#define Dbl_setinfinitypositive(dbl_valueA,dbl_valueB)            \
    Dallp1(dbl_valueA)                                \
        = (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));     \
    Dmantissap2(dbl_valueB) = 0
#define Dbl_setinfinitynegative(dbl_valueA,dbl_valueB)            \
    Dallp1(dbl_valueA) = ((unsigned int)1<<31) |            \
         (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));      \
    Dmantissap2(dbl_valueB) = 0
#define Dbl_setinfinity(dbl_valueA,dbl_valueB,sign)         \
    Dallp1(dbl_valueA) = ((unsigned int)sign << 31) |             \
      (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));   \
    Dmantissap2(dbl_valueB) = 0

#define Dbl_sethigh4bits(dbl_value, extsign) Deposit_dhigh4p1(dbl_value,extsign)
#define Dbl_set_sign(dbl_value,sign) Deposit_dsign(dbl_value,sign)
#define Dbl_invert_sign(dbl_value) Deposit_dsign(dbl_value,~Dsign(dbl_value))
#define Dbl_setone_sign(dbl_value) Deposit_dsign(dbl_value,1)
#define Dbl_setone_lowmantissap2(dbl_value) Deposit_dlowp2(dbl_value,1)
#define Dbl_setzero_sign(dbl_value) Dallp1(dbl_value) &= 0x7fffffff
#define Dbl_setzero_exponent(dbl_value)         \
    Dallp1(dbl_value) &= 0x800fffff
#define Dbl_setzero_mantissa(dbl_valueA,dbl_valueB)   \
    Dallp1(dbl_valueA) &= 0xfff00000;                 \
    Dallp2(dbl_valueB) = 0
#define Dbl_setzero_mantissap1(dbl_value) Dallp1(dbl_value) &= 0xfff00000
#define Dbl_setzero_mantissap2(dbl_value) Dallp2(dbl_value) = 0
#define Dbl_setzero_exponentmantissa(dbl_valueA,dbl_valueB) \
    Dallp1(dbl_valueA) &= 0x80000000;           \
    Dallp2(dbl_valueB) = 0
#define Dbl_setzero_exponentmantissap1(dbl_valueA)    \
    Dallp1(dbl_valueA) &= 0x80000000
#define Dbl_setzero(dbl_valueA,dbl_valueB) \
    Dallp1(dbl_valueA) = 0; Dallp2(dbl_valueB) = 0
#define Dbl_setzerop1(dbl_value) Dallp1(dbl_value) = 0
#define Dbl_setzerop2(dbl_value) Dallp2(dbl_value) = 0
#define Dbl_setnegativezero(dbl_value) \
    Dallp1(dbl_value) = (unsigned int)1 << 31; Dallp2(dbl_value) = 0
#define Dbl_setnegativezerop1(dbl_value) Dallp1(dbl_value) = (unsigned int)1<<31

/* Use the following macro for both overflow & underflow conditions */
#define ovfl -
#define unfl +
#define Dbl_setwrapped_exponent(dbl_value,exponent,op) \
    Deposit_dexponent(dbl_value,(exponent op DBL_WRAP))

#define Dbl_setlargestpositive(dbl_valueA,dbl_valueB)                   \
    Dallp1(dbl_valueA) = ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) \
                  | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 );          \
    Dallp2(dbl_valueB) = 0xFFFFFFFF
#define Dbl_setlargestnegative(dbl_valueA,dbl_valueB)                   \
    Dallp1(dbl_valueA) = ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) \
                  | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 )           \
                  | ((unsigned int)1<<31);                  \
    Dallp2(dbl_valueB) = 0xFFFFFFFF
#define Dbl_setlargest_exponentmantissa(dbl_valueA,dbl_valueB)          \
    Deposit_dexponentmantissap1(dbl_valueA,                       \
      (((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH)))           \
                  | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 )));  \
    Dallp2(dbl_valueB) = 0xFFFFFFFF

#define Dbl_setnegativeinfinity(dbl_valueA,dbl_valueB)                  \
    Dallp1(dbl_valueA) = ((1<<DBL_EXP_LENGTH) | DBL_INFINITY_EXPONENT)  \
                   << (32-(1+DBL_EXP_LENGTH)) ;                   \
    Dallp2(dbl_valueB) = 0
#define Dbl_setlargest(dbl_valueA,dbl_valueB,sign)                \
    Dallp1(dbl_valueA) = ((unsigned int)sign << 31) |             \
         ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) |       \
       ((1 << (32-(1+DBL_EXP_LENGTH))) - 1 );                     \
    Dallp2(dbl_valueB) = 0xFFFFFFFF
    

/* The high bit is always zero so arithmetic or logical shifts will work. */
#define Dbl_right_align(srcdstA,srcdstB,shift,extent)             \
    if( shift >= 32 )                                       \
      {                                               \
      /* Big shift requires examining the portion shift off             \
      the end to properly set inexact.  */                        \
      if(shift < 64)                                        \
          {                                           \
          if(shift > 32)                                    \
            {                                         \
              Variable_shift_double(Dallp1(srcdstA),Dallp2(srcdstB),    \
             shift-32, Extall(extent));                     \
              if(Dallp2(srcdstB) << 64 - (shift)) Ext_setone_low(extent); \
              }                                       \
          else Extall(extent) = Dallp2(srcdstB);                  \
          Dallp2(srcdstB) = Dallp1(srcdstA) >> (shift - 32);            \
          }                                           \
      else                                            \
          {                                           \
          Extall(extent) = Dallp1(srcdstA);                       \
          if(Dallp2(srcdstB)) Ext_setone_low(extent);             \
          Dallp2(srcdstB) = 0;                              \
          }                                           \
      Dallp1(srcdstA) = 0;                                  \
      }                                               \
    else                                              \
      {                                               \
      /* Small alignment is simpler.  Extension is easily set. */ \
      if (shift > 0)                                        \
          {                                           \
          Extall(extent) = Dallp2(srcdstB) << 32 - (shift);       \
          Variable_shift_double(Dallp1(srcdstA),Dallp2(srcdstB),shift, \
           Dallp2(srcdstB));                                \
          Dallp1(srcdstA) >>= shift;                              \
          }                                           \
      else Extall(extent) = 0;                              \
      }

/* 
 * Here we need to shift the result right to correct for an overshift
 * (due to the exponent becoming negative) during normalization.
 */
#define Dbl_fix_overshift(srcdstA,srcdstB,shift,extent)                 \
          Extall(extent) = Dallp2(srcdstB) << 32 - (shift);       \
          Dallp2(srcdstB) = (Dallp1(srcdstA) << 32 - (shift)) |   \
            (Dallp2(srcdstB) >> (shift));                   \
          Dallp1(srcdstA) = Dallp1(srcdstA) >> shift

#define Dbl_hiddenhigh3mantissa(dbl_value) Dhiddenhigh3mantissa(dbl_value)
#define Dbl_hidden(dbl_value) Dhidden(dbl_value)
#define Dbl_lowmantissap2(dbl_value) Dlowp2(dbl_value)

/* The left argument is never smaller than the right argument */
#define Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb)               \
    if( Dallp2(rightb) > Dallp2(leftb) ) Dallp1(lefta)--;   \
    Dallp2(resultb) = Dallp2(leftb) - Dallp2(rightb);       \
    Dallp1(resulta) = Dallp1(lefta) - Dallp1(righta)

/* Subtract right augmented with extension from left augmented with zeros and
 * store into result and extension. */
#define Dbl_subtract_withextension(lefta,leftb,righta,rightb,extent,resulta,resultb)      \
    Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb);            \
    if( (Extall(extent) = 0-Extall(extent)) )                     \
        {                                             \
        if((Dallp2(resultb)--) == 0) Dallp1(resulta)--;                 \
        }

#define Dbl_addition(lefta,leftb,righta,rightb,resulta,resultb)         \
    /* If the sum of the low words is less than either source, then     \
     * an overflow into the next word occurred. */                \
    Dallp1(resulta) = Dallp1(lefta) + Dallp1(righta);             \
    if((Dallp2(resultb) = Dallp2(leftb) + Dallp2(rightb)) < Dallp2(rightb)) \
      Dallp1(resulta)++

#define Dbl_xortointp1(left,right,result)             \
    result = Dallp1(left) XOR Dallp1(right)

#define Dbl_xorfromintp1(left,right,result)                 \
    Dallp1(result) = left XOR Dallp1(right)

#define Dbl_swap_lower(left,right)                    \
    Dallp2(left)  = Dallp2(left) XOR Dallp2(right);         \
    Dallp2(right) = Dallp2(left) XOR Dallp2(right);         \
    Dallp2(left)  = Dallp2(left) XOR Dallp2(right)

/* Need to Initialize */
#define Dbl_makequietnan(desta,destb)                             \
    Dallp1(desta) = ((DBL_EMAX+DBL_BIAS)+1)<< (32-(1+DBL_EXP_LENGTH))   \
                 | (1<<(32-(1+DBL_EXP_LENGTH+2)));                \
    Dallp2(destb) = 0
#define Dbl_makesignalingnan(desta,destb)                   \
    Dallp1(desta) = ((DBL_EMAX+DBL_BIAS)+1)<< (32-(1+DBL_EXP_LENGTH))   \
                 | (1<<(32-(1+DBL_EXP_LENGTH+1)));                \
    Dallp2(destb) = 0

#define Dbl_normalize(dbl_opndA,dbl_opndB,exponent)               \
      while(Dbl_iszero_hiddenhigh7mantissa(dbl_opndA)) {          \
            Dbl_leftshiftby8(dbl_opndA,dbl_opndB);                \
            exponent -= 8;                                  \
      }                                               \
      if(Dbl_iszero_hiddenhigh3mantissa(dbl_opndA)) {             \
            Dbl_leftshiftby4(dbl_opndA,dbl_opndB);                \
            exponent -= 4;                                  \
      }                                               \
      while(Dbl_iszero_hidden(dbl_opndA)) {                       \
            Dbl_leftshiftby1(dbl_opndA,dbl_opndB);                \
            exponent -= 1;                                  \
      }

#define Twoword_add(src1dstA,src1dstB,src2A,src2B)          \
      /*                                        \
       * want this macro to generate:                       \
       *    ADD   src1dstB,src2B,src1dstB;            \
       *    ADDC  src1dstA,src2A,src1dstA;            \
       */                                       \
      if ((src1dstB) + (src2B) < (src1dstB)) Dallp1(src1dstA)++; \
      Dallp1(src1dstA) += (src2A);                    \
      Dallp2(src1dstB) += (src2B)

#define Twoword_subtract(src1dstA,src1dstB,src2A,src2B)           \
      /*                                        \
       * want this macro to generate:                       \
       *    SUB   src1dstB,src2B,src1dstB;            \
       *    SUBB  src1dstA,src2A,src1dstA;            \
       */                                       \
      if ((src1dstB) < (src2B)) Dallp1(src1dstA)--;         \
      Dallp1(src1dstA) -= (src2A);                    \
      Dallp2(src1dstB) -= (src2B)

#define Dbl_setoverflow(resultA,resultB)                    \
      /* set result to infinity or largest number */              \
      switch (Rounding_mode()) {                            \
            case ROUNDPLUS:                                 \
                  if (Dbl_isone_sign(resultA)) {                  \
                        Dbl_setlargestnegative(resultA,resultB); \
                  }                                   \
                  else {                                    \
                        Dbl_setinfinitypositive(resultA,resultB); \
                  }                                   \
                  break;                                    \
            case ROUNDMINUS:                          \
                  if (Dbl_iszero_sign(resultA)) {                 \
                        Dbl_setlargestpositive(resultA,resultB); \
                  }                                   \
                  else {                                    \
                        Dbl_setinfinitynegative(resultA,resultB); \
                  }                                   \
                  break;                                    \
            case ROUNDNEAREST:                              \
                  Dbl_setinfinity_exponentmantissa(resultA,resultB); \
                  break;                                    \
            case ROUNDZERO:                                 \
                  Dbl_setlargest_exponentmantissa(resultA,resultB); \
      }

#define Dbl_denormalize(opndp1,opndp2,exponent,guard,sticky,inexact)    \
    Dbl_clear_signexponent_set_hidden(opndp1);                    \
    if (exponent >= (1-DBL_P)) {                            \
      if (exponent >= -31) {                                \
          guard = (Dallp2(opndp2) >> -exponent) & 1;              \
          if (exponent < 0) sticky |= Dallp2(opndp2) << (32+exponent); \
          if (exponent > -31) {                             \
            Variable_shift_double(opndp1,opndp2,1-exponent,opndp2);     \
            Dallp1(opndp1) >>= 1-exponent;                        \
          }                                           \
          else {                                      \
            Dallp2(opndp2) = Dallp1(opndp1);                \
            Dbl_setzerop1(opndp1);                          \
          }                                           \
      }                                               \
      else {                                                \
          guard = (Dallp1(opndp1) >> -32-exponent) & 1;           \
          if (exponent == -32) sticky |= Dallp2(opndp2);          \
          else sticky |= (Dallp2(opndp2) | Dallp1(opndp1) << 64+exponent); \
          Dallp2(opndp2) = Dallp1(opndp1) >> -31-exponent;        \
          Dbl_setzerop1(opndp1);                            \
      }                                               \
      inexact = guard | sticky;                             \
    }                                                 \
    else {                                            \
      guard = 0;                                      \
      sticky |= (Dallp1(opndp1) | Dallp2(opndp2));                \
      Dbl_setzero(opndp1,opndp2);                           \
      inexact = sticky;                               \
    }

/* 
 * The fused multiply add instructions requires a double extended format,
 * with 106 bits of mantissa.
 */
#define DBLEXT_THRESHOLD 106

#define Dblext_setzero(valA,valB,valC,valD)     \
    Dextallp1(valA) = 0; Dextallp2(valB) = 0;   \
    Dextallp3(valC) = 0; Dextallp4(valD) = 0


#define Dblext_isnotzero_mantissap3(valC) (Dextallp3(valC)!=0)
#define Dblext_isnotzero_mantissap4(valD) (Dextallp3(valD)!=0)
#define Dblext_isone_lowp2(val) (Dextlowp2(val)!=0)
#define Dblext_isone_highp3(val) (Dexthighp3(val)!=0)
#define Dblext_isnotzero_low31p3(val) (Dextlow31p3(val)!=0)
#define Dblext_iszero(valA,valB,valC,valD) (Dextallp1(valA)==0 && \
    Dextallp2(valB)==0 && Dextallp3(valC)==0 && Dextallp4(valD)==0)

#define Dblext_copy(srca,srcb,srcc,srcd,desta,destb,destc,destd) \
    Dextallp1(desta) = Dextallp4(srca);   \
    Dextallp2(destb) = Dextallp4(srcb);   \
    Dextallp3(destc) = Dextallp4(srcc);   \
    Dextallp4(destd) = Dextallp4(srcd)

#define Dblext_swap_lower(leftp2,leftp3,leftp4,rightp2,rightp3,rightp4)  \
    Dextallp2(leftp2)  = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
    Dextallp2(rightp2) = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
    Dextallp2(leftp2)  = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
    Dextallp3(leftp3)  = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
    Dextallp3(rightp3) = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
    Dextallp3(leftp3)  = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
    Dextallp4(leftp4)  = Dextallp4(leftp4) XOR Dextallp4(rightp4);  \
    Dextallp4(rightp4) = Dextallp4(leftp4) XOR Dextallp4(rightp4);  \
    Dextallp4(leftp4)  = Dextallp4(leftp4) XOR Dextallp4(rightp4)

#define Dblext_setone_lowmantissap4(dbl_value) Deposit_dextlowp4(dbl_value,1)

/* The high bit is always zero so arithmetic or logical shifts will work. */
#define Dblext_right_align(srcdstA,srcdstB,srcdstC,srcdstD,shift) \
  {int shiftamt, sticky;                                    \
    shiftamt = shift % 32;                                  \
    sticky = 0;                                             \
    switch (shift/32) {                                     \
     case 0: if (shiftamt > 0) {                            \
              sticky = Dextallp4(srcdstD) << 32 - (shiftamt);     \
                Variable_shift_double(Dextallp3(srcdstC),         \
             Dextallp4(srcdstD),shiftamt,Dextallp4(srcdstD));     \
                Variable_shift_double(Dextallp2(srcdstB),         \
             Dextallp3(srcdstC),shiftamt,Dextallp3(srcdstC));     \
                Variable_shift_double(Dextallp1(srcdstA),         \
             Dextallp2(srcdstB),shiftamt,Dextallp2(srcdstB));     \
              Dextallp1(srcdstA) >>= shiftamt;              \
           }                                                \
           break;                                     \
     case 1: if (shiftamt > 0) {                            \
                sticky = (Dextallp3(srcdstC) << 31 - shiftamt) |  \
                   Dextallp4(srcdstD);                      \
                Variable_shift_double(Dextallp2(srcdstB),         \
             Dextallp3(srcdstC),shiftamt,Dextallp4(srcdstD));     \
                Variable_shift_double(Dextallp1(srcdstA),         \
             Dextallp2(srcdstB),shiftamt,Dextallp3(srcdstC));     \
           }                                                \
           else {                                     \
            sticky = Dextallp4(srcdstD);                    \
            Dextallp4(srcdstD) = Dextallp3(srcdstC);        \
            Dextallp3(srcdstC) = Dextallp2(srcdstB);        \
           }                                                \
           Dextallp2(srcdstB) = Dextallp1(srcdstA) >> shiftamt;   \
           Dextallp1(srcdstA) = 0;                          \
           break;                                     \
     case 2: if (shiftamt > 0) {                            \
                sticky = (Dextallp2(srcdstB) << 31 - shiftamt) |  \
                   Dextallp3(srcdstC) | Dextallp4(srcdstD); \
                Variable_shift_double(Dextallp1(srcdstA),         \
             Dextallp2(srcdstB),shiftamt,Dextallp4(srcdstD));     \
           }                                                \
           else {                                     \
            sticky = Dextallp3(srcdstC) | Dextallp4(srcdstD);     \
            Dextallp4(srcdstD) = Dextallp2(srcdstB);        \
           }                                                \
           Dextallp3(srcdstC) = Dextallp1(srcdstA) >> shiftamt;   \
           Dextallp1(srcdstA) = Dextallp2(srcdstB) = 0;           \
           break;                                     \
     case 3: if (shiftamt > 0) {                            \
                sticky = (Dextallp1(srcdstA) << 31 - shiftamt) |  \
                   Dextallp2(srcdstB) | Dextallp3(srcdstC) |      \
                   Dextallp4(srcdstD);                      \
           }                                                \
           else {                                     \
            sticky = Dextallp2(srcdstB) | Dextallp3(srcdstC) |    \
                Dextallp4(srcdstD);                         \
           }                                                \
           Dextallp4(srcdstD) = Dextallp1(srcdstA) >> shiftamt;   \
           Dextallp1(srcdstA) = Dextallp2(srcdstB) = 0;           \
           Dextallp3(srcdstC) = 0;                          \
           break;                                     \
    }                                                 \
    if (sticky) Dblext_setone_lowmantissap4(srcdstD);             \
  }

/* The left argument is never smaller than the right argument */
#define Dblext_subtract(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc,resultd) \
    if( Dextallp4(rightd) > Dextallp4(leftd) )              \
      if( (Dextallp3(leftc)--) == 0)                        \
          if( (Dextallp2(leftb)--) == 0) Dextallp1(lefta)--;      \
    Dextallp4(resultd) = Dextallp4(leftd) - Dextallp4(rightd);    \
    if( Dextallp3(rightc) > Dextallp3(leftc) )              \
        if( (Dextallp2(leftb)--) == 0) Dextallp1(lefta)--;  \
    Dextallp3(resultc) = Dextallp3(leftc) - Dextallp3(rightc);    \
    if( Dextallp2(rightb) > Dextallp2(leftb) ) Dextallp1(lefta)--; \
    Dextallp2(resultb) = Dextallp2(leftb) - Dextallp2(rightb);    \
    Dextallp1(resulta) = Dextallp1(lefta) - Dextallp1(righta)

#define Dblext_addition(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc,resultd) \
    /* If the sum of the low words is less than either source, then \
     * an overflow into the next word occurred. */ \
    if ((Dextallp4(resultd) = Dextallp4(leftd)+Dextallp4(rightd)) < \
      Dextallp4(rightd)) \
      if((Dextallp3(resultc) = Dextallp3(leftc)+Dextallp3(rightc)+1) <= \
          Dextallp3(rightc)) \
          if((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)+1) \
              <= Dextallp2(rightb))  \
                Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
          else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
      else \
          if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)) < \
              Dextallp2(rightb)) \
                Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
          else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
    else \
      if ((Dextallp3(resultc) = Dextallp3(leftc)+Dextallp3(rightc)) < \
          Dextallp3(rightc))  \
          if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)+1) \
              <= Dextallp2(rightb)) \
                Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
          else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
      else \
          if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)) < \
              Dextallp2(rightb)) \
                Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
          else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)


#define Dblext_arithrightshiftby1(srcdstA,srcdstB,srcdstC,srcdstD)      \
    Shiftdouble(Dextallp3(srcdstC),Dextallp4(srcdstD),1,Dextallp4(srcdstD)); \
    Shiftdouble(Dextallp2(srcdstB),Dextallp3(srcdstC),1,Dextallp3(srcdstC)); \
    Shiftdouble(Dextallp1(srcdstA),Dextallp2(srcdstB),1,Dextallp2(srcdstB)); \
    Dextallp1(srcdstA) = (int)Dextallp1(srcdstA) >> 1
   
#define Dblext_leftshiftby8(valA,valB,valC,valD) \
    Shiftdouble(Dextallp1(valA),Dextallp2(valB),24,Dextallp1(valA)); \
    Shiftdouble(Dextallp2(valB),Dextallp3(valC),24,Dextallp2(valB)); \
    Shiftdouble(Dextallp3(valC),Dextallp4(valD),24,Dextallp3(valC)); \
    Dextallp4(valD) <<= 8
#define Dblext_leftshiftby4(valA,valB,valC,valD) \
    Shiftdouble(Dextallp1(valA),Dextallp2(valB),28,Dextallp1(valA)); \
    Shiftdouble(Dextallp2(valB),Dextallp3(valC),28,Dextallp2(valB)); \
    Shiftdouble(Dextallp3(valC),Dextallp4(valD),28,Dextallp3(valC)); \
    Dextallp4(valD) <<= 4
#define Dblext_leftshiftby3(valA,valB,valC,valD) \
    Shiftdouble(Dextallp1(valA),Dextallp2(valB),29,Dextallp1(valA)); \
    Shiftdouble(Dextallp2(valB),Dextallp3(valC),29,Dextallp2(valB)); \
    Shiftdouble(Dextallp3(valC),Dextallp4(valD),29,Dextallp3(valC)); \
    Dextallp4(valD) <<= 3
#define Dblext_leftshiftby2(valA,valB,valC,valD) \
    Shiftdouble(Dextallp1(valA),Dextallp2(valB),30,Dextallp1(valA)); \
    Shiftdouble(Dextallp2(valB),Dextallp3(valC),30,Dextallp2(valB)); \
    Shiftdouble(Dextallp3(valC),Dextallp4(valD),30,Dextallp3(valC)); \
    Dextallp4(valD) <<= 2
#define Dblext_leftshiftby1(valA,valB,valC,valD) \
    Shiftdouble(Dextallp1(valA),Dextallp2(valB),31,Dextallp1(valA)); \
    Shiftdouble(Dextallp2(valB),Dextallp3(valC),31,Dextallp2(valB)); \
    Shiftdouble(Dextallp3(valC),Dextallp4(valD),31,Dextallp3(valC)); \
    Dextallp4(valD) <<= 1

#define Dblext_rightshiftby4(valueA,valueB,valueC,valueD) \
    Shiftdouble(Dextallp3(valueC),Dextallp4(valueD),4,Dextallp4(valueD)); \
    Shiftdouble(Dextallp2(valueB),Dextallp3(valueC),4,Dextallp3(valueC)); \
    Shiftdouble(Dextallp1(valueA),Dextallp2(valueB),4,Dextallp2(valueB)); \
    Dextallp1(valueA) >>= 4
#define Dblext_rightshiftby1(valueA,valueB,valueC,valueD) \
    Shiftdouble(Dextallp3(valueC),Dextallp4(valueD),1,Dextallp4(valueD)); \
    Shiftdouble(Dextallp2(valueB),Dextallp3(valueC),1,Dextallp3(valueC)); \
    Shiftdouble(Dextallp1(valueA),Dextallp2(valueB),1,Dextallp2(valueB)); \
    Dextallp1(valueA) >>= 1

#define Dblext_xortointp1(left,right,result) Dbl_xortointp1(left,right,result)

#define Dblext_xorfromintp1(left,right,result) \
      Dbl_xorfromintp1(left,right,result)

#define Dblext_copytoint_exponentmantissap1(src,dest) \
      Dbl_copytoint_exponentmantissap1(src,dest)

#define Dblext_ismagnitudeless(leftB,rightB,signlessleft,signlessright) \
      Dbl_ismagnitudeless(leftB,rightB,signlessleft,signlessright)

#define Dbl_copyto_dblext(src1,src2,dest1,dest2,dest3,dest4) \
      Dextallp1(dest1) = Dallp1(src1); Dextallp2(dest2) = Dallp2(src2); \
      Dextallp3(dest3) = 0; Dextallp4(dest4) = 0

#define Dblext_set_sign(dbl_value,sign)  Dbl_set_sign(dbl_value,sign)  
#define Dblext_clear_signexponent_set_hidden(srcdst) \
      Dbl_clear_signexponent_set_hidden(srcdst) 
#define Dblext_clear_signexponent(srcdst) Dbl_clear_signexponent(srcdst) 
#define Dblext_clear_sign(srcdst) Dbl_clear_sign(srcdst) 
#define Dblext_isone_hidden(dbl_value) Dbl_isone_hidden(dbl_value) 

/*
 * The Fourword_add() macro assumes that integers are 4 bytes in size.
 * It will break if this is not the case.
 */

#define Fourword_add(src1dstA,src1dstB,src1dstC,src1dstD,src2A,src2B,src2C,src2D) \
      /*                                              \
       * want this macro to generate:                             \
       *    ADD   src1dstD,src2D,src1dstD;                  \
       *    ADDC  src1dstC,src2C,src1dstC;                  \
       *    ADDC  src1dstB,src2B,src1dstB;                  \
       *    ADDC  src1dstA,src2A,src1dstA;                  \
       */                                             \
      if ((unsigned int)(src1dstD += (src2D)) < (unsigned int)(src2D)) { \
         if ((unsigned int)(src1dstC += (src2C) + 1) <=           \
             (unsigned int)(src2C)) {                             \
           if ((unsigned int)(src1dstB += (src2B) + 1) <=         \
             (unsigned int)(src2B)) src1dstA++;             \
         }                                            \
         else if ((unsigned int)(src1dstB += (src2B)) <           \
                (unsigned int)(src2B)) src1dstA++;                \
      }                                               \
      else {                                                \
         if ((unsigned int)(src1dstC += (src2C)) <                \
             (unsigned int)(src2C)) {                             \
            if ((unsigned int)(src1dstB += (src2B) + 1) <=        \
              (unsigned int)(src2B)) src1dstA++;                  \
         }                                            \
         else if ((unsigned int)(src1dstB += (src2B)) <           \
                (unsigned int)(src2B)) src1dstA++;                \
      }                                               \
      src1dstA += (src2A)

#define Dblext_denormalize(opndp1,opndp2,opndp3,opndp4,exponent,is_tiny) \
  {int shiftamt, sticky;                                    \
    is_tiny = TRUE;                                         \
    if (exponent == 0 && (Dextallp3(opndp3) || Dextallp4(opndp4))) {    \
      switch (Rounding_mode()) {                            \
      case ROUNDPLUS:                                       \
            if (Dbl_iszero_sign(opndp1)) {                        \
                  Dbl_increment(opndp1,opndp2);             \
                  if (Dbl_isone_hiddenoverflow(opndp1))           \
                        is_tiny = FALSE;              \
                  Dbl_decrement(opndp1,opndp2);             \
            }                                         \
            break;                                          \
      case ROUNDMINUS:                                \
            if (Dbl_isone_sign(opndp1)) {                   \
                  Dbl_increment(opndp1,opndp2);             \
                  if (Dbl_isone_hiddenoverflow(opndp1))           \
                        is_tiny = FALSE;              \
                  Dbl_decrement(opndp1,opndp2);             \
            }                                         \
            break;                                          \
      case ROUNDNEAREST:                                    \
            if (Dblext_isone_highp3(opndp3) &&              \
                (Dblext_isone_lowp2(opndp2) ||              \
                 Dblext_isnotzero_low31p3(opndp3)))   {           \
                  Dbl_increment(opndp1,opndp2);             \
                  if (Dbl_isone_hiddenoverflow(opndp1))           \
                        is_tiny = FALSE;              \
                  Dbl_decrement(opndp1,opndp2);             \
            }                                         \
            break;                                          \
      }                                               \
    }                                                 \
    Dblext_clear_signexponent_set_hidden(opndp1);                 \
    if (exponent >= (1-QUAD_P)) {                           \
      shiftamt = (1-exponent) % 32;                         \
      switch((1-exponent)/32) {                             \
        case 0: sticky = Dextallp4(opndp4) << 32-(shiftamt);            \
              Variableshiftdouble(opndp3,opndp4,shiftamt,opndp4); \
              Variableshiftdouble(opndp2,opndp3,shiftamt,opndp3); \
              Variableshiftdouble(opndp1,opndp2,shiftamt,opndp2); \
              Dextallp1(opndp1) >>= shiftamt;               \
              break;                                  \
        case 1: sticky = (Dextallp3(opndp3) << 32-(shiftamt)) |   \
                     Dextallp4(opndp4);                     \
              Variableshiftdouble(opndp2,opndp3,shiftamt,opndp4); \
              Variableshiftdouble(opndp1,opndp2,shiftamt,opndp3); \
              Dextallp2(opndp2) = Dextallp1(opndp1) >> shiftamt;  \
              Dextallp1(opndp1) = 0;                        \
              break;                                  \
        case 2: sticky = (Dextallp2(opndp2) << 32-(shiftamt)) |   \
                      Dextallp3(opndp3) | Dextallp4(opndp4);      \
              Variableshiftdouble(opndp1,opndp2,shiftamt,opndp4); \
              Dextallp3(opndp3) = Dextallp1(opndp1) >> shiftamt;  \
              Dextallp1(opndp1) = Dextallp2(opndp2) = 0;          \
              break;                                  \
        case 3: sticky = (Dextallp1(opndp1) << 32-(shiftamt)) |   \
                  Dextallp2(opndp2) | Dextallp3(opndp3) |   \
                  Dextallp4(opndp4);                        \
              Dextallp4(opndp4) = Dextallp1(opndp1) >> shiftamt;  \
              Dextallp1(opndp1) = Dextallp2(opndp2) = 0;          \
              Dextallp3(opndp3) = 0;                        \
              break;                                  \
      }                                               \
    }                                                 \
    else {                                            \
      sticky = Dextallp1(opndp1) | Dextallp2(opndp2) |            \
             Dextallp3(opndp3) | Dextallp4(opndp4);               \
      Dblext_setzero(opndp1,opndp2,opndp3,opndp4);                \
    }                                                 \
    if (sticky) Dblext_setone_lowmantissap4(opndp4);              \
    exponent = 0;                                     \
  }

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