456 #define Twoword_add(src1dstA,src1dstB,src2A,src2B)		\  argument
462 	if ((src1dstB) + (src2B) < (src1dstB)) Dallp1(src1dstA)++; \
464 	Dallp2(src1dstB) += (src2B)
466 #define Twoword_subtract(src1dstA,src1dstB,src2A,src2B)		\  argument
472 	if ((src1dstB) < (src2B)) Dallp1(src1dstA)--;		\
474 	Dallp2(src1dstB) -= (src2B)
747 #define Fourword_add(src1dstA,src1dstB,src1dstC,src1dstD,src2A,src2B,src2C,src2D) \  argument
758 	     if ((unsigned int)(src1dstB += (src2B) + 1) <=		\
761 	   else if ((unsigned int)(src1dstB += (src2B)) < 		\
767 	      if ((unsigned int)(src1dstB += (src2B) + 1) <=		\
770 	   else if ((unsigned int)(src1dstB += (src2B)) <		\