xref: /kernel/linux/linux-6.6/arch/parisc/math-emu/dbl_float.h (revision 62306a36)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
 *
 * Floating-point emulation code
 *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
 */
#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;							\
  }