butterfly 510 libavcodec/arm/hevcdsp_idct_neon.S .macro butterfly e, o, tmp_p, tmp_m butterfly 189 libavcodec/arm/vp9itxfm_16bpp_neon.S .macro butterfly out1, out2, in1, in2 butterfly 178 libavcodec/arm/vp9itxfm_neon.S .macro butterfly out1, out2, in1, in2