16 Mar 2019, 16:34 by d...@lynne.ee: > 153372 UNITS in postfilter_c, 65536 runs, 0 skips > 73164 UNITS in postfilter_neon, 65536 runs, 0 skips -> 2.1x speedup > > 80591 UNITS in deemphasis_c, 131072 runs, 0 skips > 43969 UNITS in deemphasis_neon, 131072 runs, 0 skips -> 1.83x speedup > > Total decoder speedup: ~15% on a Raspberry Pi 3 (from 28.1x to 33.5x realtime) > > Deemphasis SIMD based on the following unrolling: > const float c1 = CELT_EMPH_COEFF, c2 = c1*c1, c3 = c2*c1, c4 = c3*c1; > float state = coeff; > > for (int i = 0; i < len; i += 4) { > y[0] = x[0] + c1*state; > y[1] = x[1] + c2*state + c1*x[0]; > y[2] = x[2] + c3*state + c1*x[1] + c2*x[0]; > y[3] = x[3] + c4*state + c1*x[2] + c2*x[1] + c3*x[0]; > > state = y[3]; > y += 4; > x += 4; > } > > Unlike the x86 version, duplication is used instead of pslldq so > the structure and tables are different. > Same approach tested on x86 (3x pslldq -> vbroadcastss + shufps + pslldq) > had the same performance, so 3x pslldq was kept as vbroadcastss has a higher > latency. >
Could someone review the patches? _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".