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5989add4ab
This improves accuracy (very slightly) and speed for processors having fma3. Sample benchmark (fate flac-16-lpc-cholesky, Haswell): old: 5993610 decicycles in ff_lpc_calc_coefs, 64 runs, 0 skips 5951528 decicycles in ff_lpc_calc_coefs, 128 runs, 0 skips new: 5252410 decicycles in ff_lpc_calc_coefs, 64 runs, 0 skips 5232869 decicycles in ff_lpc_calc_coefs, 128 runs, 0 skips Tested with FATE and --disable-fma3, also examined contents of lavu/lls-test. Reviewed-by: James Almer <jamrial@gmail.com> Reviewed-by: Henrik Gramner <henrik@gramner.com> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/*
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* linear least squares model
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*
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* Copyright (c) 2013 Loren Merritt
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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/lls.h"
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#include "libavutil/x86/cpu.h"
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void ff_update_lls_sse2(LLSModel *m, const double *var);
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void ff_update_lls_avx(LLSModel *m, const double *var);
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void ff_update_lls_fma3(LLSModel *m, const double *var);
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double ff_evaluate_lls_sse2(LLSModel *m, const double *var, int order);
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av_cold void ff_init_lls_x86(LLSModel *m)
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{
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int cpu_flags = av_get_cpu_flags();
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if (EXTERNAL_SSE2(cpu_flags)) {
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m->update_lls = ff_update_lls_sse2;
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if (m->indep_count >= 4)
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m->evaluate_lls = ff_evaluate_lls_sse2;
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}
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if (EXTERNAL_AVX_FAST(cpu_flags)) {
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m->update_lls = ff_update_lls_avx;
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}
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if (EXTERNAL_FMA3(cpu_flags) && !(cpu_flags & AV_CPU_FLAG_AVXSLOW)) {
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m->update_lls = ff_update_lls_fma3;
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}
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}
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