xref: /src/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 *);