REX3_REG_XYENDI
rex3_write(dc, REX3_REG_XYENDI,
rex3_write_go(dc, REX3_REG_XYENDI, (x2 << REX3_XYENDI_XSHIFT) | y2);
rex3_write(dc, REX3_REG_XYENDI, (xe << REX3_XYENDI_XSHIFT) | ye);