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fc9e63474f
Makes GCC optimize the scalar codepath away. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2014 Arwa Arif <arwaarif1994@gmail.com>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef AVFILTER_PP7DSP_H
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#define AVFILTER_PP7DSP_H
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#include <stdint.h>
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#include "config.h"
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typedef struct PP7DSPContext {
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void (*dctB)(int16_t *restrict dst, const int16_t *restrict src);
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} PP7DSPContext;
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void ff_pp7dsp_init_x86(PP7DSPContext *pp7dsp);
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static void dctB_c(int16_t *restrict dst, const int16_t *restrict src)
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{
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for (int i = 0; i < 4; i++) {
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int s0 = src[0 * 4] + src[6 * 4];
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int s1 = src[1 * 4] + src[5 * 4];
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int s2 = src[2 * 4] + src[4 * 4];
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int s3 = src[3 * 4];
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int s = s3 + s3;
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s3 = s - s0;
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s0 = s + s0;
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s = s2 + s1;
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s2 = s2 - s1;
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dst[0 * 4] = s0 + s;
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dst[2 * 4] = s0 - s;
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dst[1 * 4] = 2 * s3 + s2;
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dst[3 * 4] = s3 - 2 * s2;
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src++;
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dst++;
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}
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}
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static inline void ff_pp7dsp_init(PP7DSPContext *pp7dsp)
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{
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pp7dsp->dctB = dctB_c;
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#if ARCH_X86 && HAVE_X86ASM
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ff_pp7dsp_init_x86(pp7dsp);
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#endif
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}
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#endif /* AVFILTER_PP7DSP_H */
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