sys/arch/hppa/spmath/dbl_float.h

root/sys/arch/hppa/spmath/dbl_float.h
/*      $NetBSD: dbl_float.h,v 1.4 2022/05/28 22:08:47 andvar Exp $     */

/*      $OpenBSD: dbl_float.h,v 1.10 2004/01/02 14:39:01 mickey Exp $   */

/*
 * Copyright 1996 1995 by Open Software Foundation, Inc.
 *              All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appears in all copies and
 * that both the copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
/*
 * pmk1.1
 */
/*
 * (c) Copyright 1986 HEWLETT-PACKARD COMPANY
 *
 * To anyone who acknowledges that this file is provided "AS IS"
 * without any express or implied warranty:
 *     permission to use, copy, modify, and distribute this file
 * for any purpose is hereby granted without fee, provided that
 * the above copyright notice and this notice appears in all
 * copies, and that the name of Hewlett-Packard Company not be
 * used in advertising or publicity pertaining to distribution
 * of the software without specific, written prior permission.
 * Hewlett-Packard Company makes no representations about the
 * suitability of this software for any purpose.
 */

#include <sys/cdefs.h>

/**************************************
 * Declare double precision functions *
 **************************************/

/* 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)|~(1<<31)) & Dallp1(src1dst)
#define Dbl_or_signs( src1dst, src2)            \
    Dallp1(src1dst) = (Dallp1(src2)&(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) &= ~(1<<31)
#define Dbl_clear_signexponent(srcdst) \
    Dallp1(srcdst) &= Dmantissap1((unsigned)-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) &= (1<<31);  /* clear exponentmantissa 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)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) = (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) = (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) = 1 << 31; Dallp2(dbl_value) = 0
#define Dbl_setnegativezerop1(dbl_value) Dallp1(dbl_value) = 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 ) | (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) = (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;                                               \
    }


int dbl_fadd(dbl_floating_point *, dbl_floating_point*, dbl_floating_point*, unsigned int *);
int dbl_fcmp(dbl_floating_point *, dbl_floating_point*, unsigned int, unsigned int *);
int dbl_fdiv(dbl_floating_point *, dbl_floating_point *, dbl_floating_point *, unsigned int *);
int dbl_fmpy(dbl_floating_point *, dbl_floating_point *, dbl_floating_point*, unsigned int *);
int dbl_frem(dbl_floating_point *, dbl_floating_point *, dbl_floating_point*, unsigned int *);
int dbl_fsqrt(dbl_floating_point *, dbl_floating_point *, unsigned int *);
int dbl_fsub(dbl_floating_point *, dbl_floating_point *, dbl_floating_point*, unsigned int *);

dbl_floating_point dbl_setoverflow(unsigned int);

int sgl_to_dbl_fcnvff(sgl_floating_point *, dbl_floating_point *, unsigned int *);
int dbl_to_sgl_fcnvff(dbl_floating_point *, sgl_floating_point *, unsigned int *);

int dbl_frnd(dbl_floating_point *, dbl_floating_point *, unsigned int *);