x86/opusdsp: implement FMA3 accelerated postfilter and deemphasis
58893 decicycles in deemphasis_c, 130548 runs, 524 skips
9475 decicycles in deemphasis_fma3, 130686 runs, 386 skips -> 6.21x speedup
24866 decicycles in postfilter_c, 65386 runs, 150 skips
5268 decicycles in postfilter_fma3, 65505 runs, 31 skips -> 4.72x speedup
Total decoder speedup: ~14%
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;
}
6 years ago
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;******************************************************************************
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;* Opus SIMD functions
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;*
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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/x86/x86util.asm"
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SECTION_RODATA
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; 0.85..^1 0.85..^2 0.85..^3 0.85..^4
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tab_st: dd 0x3f599a00, 0x3f38f671, 0x3f1d382a, 0x3f05a32f
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tab_x0: dd 0x0, 0x3f599a00, 0x3f599a00, 0x3f599a00
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tab_x1: dd 0x0, 0x0, 0x3f38f671, 0x3f38f671
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tab_x2: dd 0x0, 0x0, 0x0, 0x3f1d382a
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SECTION .text
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INIT_XMM fma3
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%if UNIX64
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cglobal opus_deemphasis, 3, 3, 8, out, in, len
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%else
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cglobal opus_deemphasis, 4, 4, 8, out, in, coeff, len
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%endif
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%if ARCH_X86_32
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VBROADCASTSS m0, coeffm
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%elif WIN64
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shufps m0, m2, m2, 0
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x86/opusdsp: implement FMA3 accelerated postfilter and deemphasis
58893 decicycles in deemphasis_c, 130548 runs, 524 skips
9475 decicycles in deemphasis_fma3, 130686 runs, 386 skips -> 6.21x speedup
24866 decicycles in postfilter_c, 65386 runs, 150 skips
5268 decicycles in postfilter_fma3, 65505 runs, 31 skips -> 4.72x speedup
Total decoder speedup: ~14%
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;
}
6 years ago
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%else
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shufps m0, m0, 0
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%endif
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movaps m4, [tab_st]
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movaps m5, [tab_x0]
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movaps m6, [tab_x1]
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movaps m7, [tab_x2]
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.loop:
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movaps m1, [inq] ; x0, x1, x2, x3
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pslldq m2, m1, 4 ; 0, x0, x1, x2
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pslldq m3, m1, 8 ; 0, 0, x0, x1
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fmaddps m2, m2, m5, m1 ; x + c1*x[0-2]
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pslldq m1, 12 ; 0, 0, 0, x0
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fmaddps m2, m3, m6, m2 ; x + c1*x[0-2] + c2*x[0-1]
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fmaddps m1, m1, m7, m2 ; x + c1*x[0-2] + c2*x[0-1] + c3*x[0]
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fmaddps m0, m0, m4, m1 ; x + c1*x[0-2] + c2*x[0-1] + c3*x[0] + c*s
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movaps [outq], m0
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shufps m0, m0, q3333 ; new state
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add inq, mmsize
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add outq, mmsize
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sub lenq, mmsize >> 2
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jg .loop
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%if ARCH_X86_64 == 0
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movss r0m, m0
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fld dword r0m
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%endif
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RET
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INIT_XMM fma3
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cglobal opus_postfilter, 4, 4, 8, data, period, gains, len
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VBROADCASTSS m0, [gainsq + 0]
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VBROADCASTSS m1, [gainsq + 4]
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VBROADCASTSS m2, [gainsq + 8]
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lea periodq, [periodq*4 + 8]
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neg periodq
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movups m3, [dataq + periodq]
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mulps m3, m2
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.loop:
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movups m4, [dataq + periodq + 4]
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movups m5, [dataq + periodq + 8]
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movups m6, [dataq + periodq + 12]
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movups m7, [dataq + periodq + 16]
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fmaddps m3, m7, m2, m3
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addps m6, m4
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fmaddps m5, m5, m0, [dataq]
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fmaddps m6, m6, m1, m3
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addps m5, m6
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mulps m3, m7, m2
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movaps [dataq], m5
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add dataq, mmsize
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sub lenq, mmsize >> 2
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jg .loop
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RET
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