mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-12 18:25:57 +02:00
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>
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/*
|
|
* AAC Spectral Band Replication decoding functions
|
|
* Copyright (c) 2012 Christophe Gisquet <christophe.gisquet@gmail.com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "libavutil/cpu.h"
|
|
#include "libavcodec/sbrdsp.h"
|
|
|
|
float ff_sbr_sum_square_sse(float (*x)[2], int n);
|
|
void ff_sbr_hf_g_filt_sse(float (*Y)[2], const float (*X_high)[40][2],
|
|
const float *g_filt, int m_max, intptr_t ixh);
|
|
|
|
void ff_sbrdsp_init_x86(SBRDSPContext *s)
|
|
{
|
|
if (HAVE_YASM) {
|
|
int mm_flags = av_get_cpu_flags();
|
|
|
|
if (mm_flags & AV_CPU_FLAG_SSE) {
|
|
s->sum_square = ff_sbr_sum_square_sse;
|
|
s->hf_g_filt = ff_sbr_hf_g_filt_sse;
|
|
}
|
|
}
|
|
}
|