526 #define Dblext_setzero(valA,valB,valC,valD)	\  argument
528     Dextallp3(valC) = 0; Dextallp4(valD) = 0
532 #define Dblext_isnotzero_mantissap4(valD) (Dextallp3(valD)!=0)  argument
536 #define Dblext_iszero(valA,valB,valC,valD) (Dextallp1(valA)==0 && \  argument
537     Dextallp2(valB)==0 && Dextallp3(valC)==0 && Dextallp4(valD)==0)
670 #define Dblext_leftshiftby8(valA,valB,valC,valD) \  argument
673     Shiftdouble(Dextallp3(valC),Dextallp4(valD),24,Dextallp3(valC)); \
674     Dextallp4(valD) <<= 8
675 #define Dblext_leftshiftby4(valA,valB,valC,valD) \  argument
678     Shiftdouble(Dextallp3(valC),Dextallp4(valD),28,Dextallp3(valC)); \
679     Dextallp4(valD) <<= 4
680 #define Dblext_leftshiftby3(valA,valB,valC,valD) \  argument
683     Shiftdouble(Dextallp3(valC),Dextallp4(valD),29,Dextallp3(valC)); \
684     Dextallp4(valD) <<= 3
685 #define Dblext_leftshiftby2(valA,valB,valC,valD) \  argument
688     Shiftdouble(Dextallp3(valC),Dextallp4(valD),30,Dextallp3(valC)); \
689     Dextallp4(valD) <<= 2
690 #define Dblext_leftshiftby1(valA,valB,valC,valD) \  argument
693     Shiftdouble(Dextallp3(valC),Dextallp4(valD),31,Dextallp3(valC)); \
694     Dextallp4(valD) <<= 1