CMP
if (CMP(CMP) > 0)
if (CMP(CMP /*EQ*/) == 0)
int st = CMP(pa->start, pb->start);
int ed = CMP(pb->end, pa->end);
#define XT_CMP(CMP, K, X, OFFSET64)\
(CMP) = ((K) >= OFFSET64 + lengthXAD(X)) ? 1 :\