Dbl_subtract
Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb); \
Dbl_subtract(leftp1,leftp2,/*minus*/rightp1,rightp2,
Dbl_subtract(opnd2p1,opnd2p2,opnd1p1,opnd1p2,
Dbl_subtract(opnd1p1,opnd1p2,opnd2p1,opnd2p2,opnd1p1,opnd1p2);
Dbl_subtract(opnd1p1,opnd1p2,opnd2p1,opnd2p2,opnd1p1,opnd1p2);
Dbl_subtract(opnd2p1,opnd2p2,opnd1p1,opnd1p2,opnd1p1,opnd1p2);
Dbl_subtract(srcp1,srcp2,sump1,sump2,srcp1,srcp2);
Dbl_subtract(leftp1,leftp2,/*minus*/rightp1,rightp2,