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2784d18791
Unrolling the main loop to process, instead of 4 elements: - 8: minor gain of 2 cycles (not worth the extra object size) - 2: loss of 8 cycles. Assigning STEP to a register is a loss. Output address (Y) is almost always unaligned. Timings: - C (32/64 bits): 117/109 cycles - SSE: 57 cycles Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
40 lines
1.4 KiB
C
40 lines
1.4 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_sbr_hf_g_filt_sse(float (*Y)[2], const float (*X_high)[40][2],
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const float *g_filt, int m_max, intptr_t ixh);
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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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s->hf_g_filt = ff_sbr_hf_g_filt_sse;
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}
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}
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}
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