ALIGNMASK
align = startx & ALIGNMASK;
rmask = ALL1BITS << (-width & ALIGNMASK);
align = startx & ALIGNMASK;
rmask = ALL1BITS << (-width & ALIGNMASK);
align = startx & ALIGNMASK;
rmask = ALL1BITS << (-width & ALIGNMASK);
align = startx & ALIGNMASK;
rmask = ALL1BITS << (-width & ALIGNMASK);