23 Mar 2019, 15:04 by ceffm...@gmail.com: > 2019-03-23 15:23 GMT+01:00, Lynne <> d...@lynne.ee <mailto:d...@lynne.ee>> >: > >> 16 Mar 2019, 16:34 by >> d...@lynne.ee <mailto: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? >> > > Which toolchains did you test? > (For compilation, not performance.) >
gcc 8.2.1 on both aarch64 and x86-64 _______________________________________________ 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".