mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
4d2f62150d
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.
114 lines
2.8 KiB
ArmAsm
114 lines
2.8 KiB
ArmAsm
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/aarch64/asm.S"
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// 0.85..^1 0.85..^2 0.85..^3 0.85..^4
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const tab_st, align=4
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.word 0x3f599a00, 0x3f38f671, 0x3f1d382a, 0x3f05a32f
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endconst
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const tab_x0, align=4
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.word 0x0, 0x3f599a00, 0x3f38f671, 0x3f1d382a
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endconst
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const tab_x1, align=4
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.word 0x0, 0x0, 0x3f599a00, 0x3f38f671
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endconst
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const tab_x2, align=4
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.word 0x0, 0x0, 0x0, 0x3f599a00
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endconst
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function ff_opus_deemphasis_neon, export=1
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movrel x4, tab_st
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ld1 {v4.4s}, [x4]
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movrel x4, tab_x0
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ld1 {v5.4s}, [x4]
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movrel x4, tab_x1
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ld1 {v6.4s}, [x4]
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movrel x4, tab_x2
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ld1 {v7.4s}, [x4]
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fmul v0.4s, v4.4s, v0.s[0]
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1: ld1 {v1.4s, v2.4s}, [x1], #32
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fmla v0.4s, v5.4s, v1.s[0]
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fmul v3.4s, v7.4s, v2.s[2]
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fmla v0.4s, v6.4s, v1.s[1]
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fmla v3.4s, v6.4s, v2.s[1]
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fmla v0.4s, v7.4s, v1.s[2]
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fmla v3.4s, v5.4s, v2.s[0]
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fadd v1.4s, v1.4s, v0.4s
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fadd v2.4s, v2.4s, v3.4s
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fmla v2.4s, v4.4s, v1.s[3]
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st1 {v1.4s, v2.4s}, [x0], #32
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fmul v0.4s, v4.4s, v2.s[3]
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subs w2, w2, #8
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b.gt 1b
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mov s0, v2.s[3]
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ret
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endfunc
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function ff_opus_postfilter_neon, export=1
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ld1 {v0.4s}, [x2]
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dup v1.4s, v0.s[1]
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dup v2.4s, v0.s[2]
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dup v0.4s, v0.s[0]
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add w1, w1, #2
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sub x1, x0, x1, lsl #2
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ld1 {v3.4s}, [x1]
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fmul v3.4s, v3.4s, v2.4s
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1: add x1, x1, #4
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ld1 {v4.4s}, [x1]
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add x1, x1, #4
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ld1 {v5.4s}, [x1]
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add x1, x1, #4
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ld1 {v6.4s}, [x1]
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add x1, x1, #4
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ld1 {v7.4s}, [x1]
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fmla v3.4s, v7.4s, v2.4s
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fadd v6.4s, v6.4s, v4.4s
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ld1 {v8.4s}, [x0]
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fmla v8.4s, v5.4s, v0.4s
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fmul v6.4s, v6.4s, v1.4s
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fadd v6.4s, v6.4s, v3.4s
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fadd v8.4s, v8.4s, v6.4s
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fmul v3.4s, v7.4s, v2.4s
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st1 {v8.4s}, [x0], #16
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subs w3, w3, #4
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b.gt 1b
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ret
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endfunc
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