vbstop2hw
custom.vbstop = vbstop2hw(par->vbstop);
(copl++)->l = CMOVE(vbstop2hw(par->vbstop + 1), vbstop);
(cops++)->l = CMOVE(vbstop2hw(par->vbstop), vbstop);
(copl++)->l = CMOVE(vbstop2hw(par->vbstop), vbstop);