zero_cmp         3466 libavcodec/dsputil.c             cmp[i]= zero_cmp;
zero_cmp          298 libavcodec/motion_est.c             s->dsp.me_cmp[2]= zero_cmp;
zero_cmp          301 libavcodec/motion_est.c             s->dsp.me_sub_cmp[2]= zero_cmp;