40e6575aa3
This is more spec-compliant because it does not rely on dead-code elimination by the compiler. Especially MSVC has problems with this, as can be seen in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html or https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html This commit does not eliminate every instance where we rely on dead code elimination: It only tackles branching to the initialization of arch-specific dsp code, not e.g. all uses of CONFIG_ and HAVE_ checks. But maybe it is already enough to compile FFmpeg with MSVC with whole-programm-optimizations enabled (if one does not disable too many components). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
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* Copyright (c) 2017 Paul B Mahol
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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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#ifndef AVFILTER_AFIRDSP_H
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#define AVFILTER_AFIRDSP_H
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#include <stddef.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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typedef struct AudioFIRDSPContext {
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void (*fcmul_add)(float *sum, const float *t, const float *c,
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ptrdiff_t len);
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void (*dcmul_add)(double *sum, const double *t, const double *c,
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ptrdiff_t len);
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} AudioFIRDSPContext;
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void ff_afir_init_x86(AudioFIRDSPContext *s);
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static void fcmul_add_c(float *sum, const float *t, const float *c, ptrdiff_t len)
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{
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int n;
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for (n = 0; n < len; n++) {
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const float cre = c[2 * n ];
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const float cim = c[2 * n + 1];
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const float tre = t[2 * n ];
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const float tim = t[2 * n + 1];
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sum[2 * n ] += tre * cre - tim * cim;
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sum[2 * n + 1] += tre * cim + tim * cre;
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}
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sum[2 * n] += t[2 * n] * c[2 * n];
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}
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static void dcmul_add_c(double *sum, const double *t, const double *c, ptrdiff_t len)
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{
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int n;
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for (n = 0; n < len; n++) {
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const double cre = c[2 * n ];
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const double cim = c[2 * n + 1];
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const double tre = t[2 * n ];
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const double tim = t[2 * n + 1];
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sum[2 * n ] += tre * cre - tim * cim;
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sum[2 * n + 1] += tre * cim + tim * cre;
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}
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sum[2 * n] += t[2 * n] * c[2 * n];
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}
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static av_unused void ff_afir_init(AudioFIRDSPContext *dsp)
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{
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dsp->fcmul_add = fcmul_add_c;
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dsp->dcmul_add = dcmul_add_c;
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#if ARCH_X86
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ff_afir_init_x86(dsp);
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#endif
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}
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#endif /* AVFILTER_AFIRDSP_H */
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