d_QNAN0
#define NAN_WORD0 d_QNAN0
#define NAN_WORD1 d_QNAN0
u->L[0] = (u+1)->L[0] = d_QNAN0;
u.L[0] = d_QNAN0;
u->L[0] = u->L[2] = d_QNAN0;
#ifdef d_QNAN0
L[0] = d_QNAN0;
L[0] = L[2] = d_QNAN0;