323 #define Sglext_setzero(valA,valB)	\  argument
324     Sextallp1(valA) = 0; Sextallp2(valB) = 0
326 #define Sglext_isnotzero_mantissap2(valB) (Sextallp2(valB)!=0)  argument
330 #define Sglext_iszero(valA,valB) (Sextallp1(valA)==0 && Sextallp2(valB)==0)  argument
393 #define Sglext_leftshiftby8(valA,valB) \  argument
394     Shiftdouble(Sextallp1(valA),Sextallp2(valB),24,Sextallp1(valA)); \
395     Sextallp2(valB) <<= 8
396 #define Sglext_leftshiftby4(valA,valB) \  argument
397     Shiftdouble(Sextallp1(valA),Sextallp2(valB),28,Sextallp1(valA)); \
398     Sextallp2(valB) <<= 4
399 #define Sglext_leftshiftby3(valA,valB) \  argument
400     Shiftdouble(Sextallp1(valA),Sextallp2(valB),29,Sextallp1(valA)); \
401     Sextallp2(valB) <<= 3
402 #define Sglext_leftshiftby2(valA,valB) \  argument
403     Shiftdouble(Sextallp1(valA),Sextallp2(valB),30,Sextallp1(valA)); \
404     Sextallp2(valB) <<= 2
405 #define Sglext_leftshiftby1(valA,valB) \  argument
406     Shiftdouble(Sextallp1(valA),Sextallp2(valB),31,Sextallp1(valA)); \
407     Sextallp2(valB) <<= 1