400 #define Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb)			\  argument
403     Dallp1(resulta) = Dallp1(lefta) - Dallp1(righta)
407 #define Dbl_subtract_withextension(lefta,leftb,righta,rightb,extent,resulta,resultb)	\  argument
408     Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb);		\
414 #define Dbl_addition(lefta,leftb,righta,rightb,resulta,resultb)		\  argument
417     Dallp1(resulta) = Dallp1(lefta) + Dallp1(righta);			\
635 #define Dblext_subtract(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc…  argument
645     Dextallp1(resulta) = Dextallp1(lefta) - Dextallp1(righta)
647 #define Dblext_addition(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc…  argument
656 		    Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
657 	    else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
661 		    Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
662 	    else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
668 		    Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
669 	    else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
673 		    Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
674 	    else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)