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34454c761f
The 32bits targets have been compiled with -mfpmath=sse for proper reference.
sbr_sum_square C /32bits: 82c (unrolled)/102c
C /64bits: 69c (unrolled)/82c
SSE/32bits: 42c
SSE/64bits: 31c
Use of SSE4.1 dpps to perform the final sum is slower.
Not unrolling to perform 8 operations in a loop yields 10 more cycles.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/*
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* AAC Spectral Band Replication decoding functions
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* Copyright (c) 2012 Christophe Gisquet <christophe.gisquet@gmail.com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "config.h"
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#include "libavutil/cpu.h"
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#include "libavcodec/sbrdsp.h"
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float ff_sbr_sum_square_sse(float (*x)[2], int n);
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void ff_sbrdsp_init_x86(SBRDSPContext *s)
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{
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if (HAVE_YASM) {
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int mm_flags = av_get_cpu_flags();
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if (mm_flags & AV_CPU_FLAG_SSE) {
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s->sum_square = ff_sbr_sum_square_sse;
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}
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}
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}
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