branching as late as possible -> speed gain
branching as late as possible -> speed gain

lovell/libvips,mcanthony/libvips,jcupitt/libvips,wishabi/libvips,jcupitt/libvips,wishabi/libvips,lovell/libvips,lovell/libvips,leiyangyou/libvips,mcanthony/libvips,jcupitt/libvips,leiyangyou/libvips,mcanthony/libvips,jcupitt/libvips,lovell/libvips,mcanthony/libvips,wishabi/libvips,leiyangyou/libvips,leiyangyou/libvips,wishabi/libvips