d_QNAN1
#define NAN_WORD1 d_QNAN1
#define NAN_WORD0 d_QNAN1
u->L[1] = (u+1)->L[1] = d_QNAN1;
u.L[1] = d_QNAN1;
u->L[1] = u->L[3] = d_QNAN1;
L[1] = d_QNAN1;
L[1] = L[3] = d_QNAN1;