__LO
ly = __LO(y);
__LO(x) = lx;
__LO(x) = lx;
ly = __LO(y); /* low word of y */
lx = __LO(x); /* low word of x */
ly = __LO(y); /* low word of y */
lx = __LO(x);
__LO(y) = lx;
__LO(z) = 0;
__LO(zh) = 0;
lx = __LO(x);
lx = __LO(x);
__LO(y) = lx;
__LO(z) = 0;