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https://github.com/FFmpeg/FFmpeg.git
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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>
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/*
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* Monkey's Audio lossless audio decoder
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* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
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* based upon libdemac from Dave Chapman.
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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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#include "config.h"
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#include "libavutil/attributes.h"
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#include "lossless_audiodsp.h"
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static int32_t scalarproduct_and_madd_int16_c(int16_t *v1, const int16_t *v2,
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const int16_t *v3,
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int order, int mul)
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{
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unsigned res = 0;
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do {
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res += *v1 * *v2++;
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*v1++ += mul * *v3++;
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res += *v1 * *v2++;
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*v1++ += mul * *v3++;
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} while (order-=2);
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return res;
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}
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static int32_t scalarproduct_and_madd_int32_c(int16_t *v1, const int32_t *v2,
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const int16_t *v3,
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int order, int mul)
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{
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int res = 0;
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do {
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res += *v1 * (uint32_t)*v2++;
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*v1++ += mul * *v3++;
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res += *v1 * (uint32_t)*v2++;
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*v1++ += mul * *v3++;
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} while (order-=2);
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return res;
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}
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av_cold void ff_llauddsp_init(LLAudDSPContext *c)
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{
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c->scalarproduct_and_madd_int16 = scalarproduct_and_madd_int16_c;
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c->scalarproduct_and_madd_int32 = scalarproduct_and_madd_int32_c;
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#if ARCH_ARM
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ff_llauddsp_init_arm(c);
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#elif ARCH_PPC
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ff_llauddsp_init_ppc(c);
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#elif ARCH_X86
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ff_llauddsp_init_x86(c);
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#endif
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}
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