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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>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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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 <stdint.h>
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#include "libavutil/attributes.h"
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#include "libavutil/bswap.h"
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#include "bswapdsp.h"
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static void bswap_buf(uint32_t *dst, const uint32_t *src, int w)
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{
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int i;
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for (i = 0; i + 8 <= w; i += 8) {
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dst[i + 0] = av_bswap32(src[i + 0]);
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dst[i + 1] = av_bswap32(src[i + 1]);
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dst[i + 2] = av_bswap32(src[i + 2]);
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dst[i + 3] = av_bswap32(src[i + 3]);
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dst[i + 4] = av_bswap32(src[i + 4]);
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dst[i + 5] = av_bswap32(src[i + 5]);
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dst[i + 6] = av_bswap32(src[i + 6]);
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dst[i + 7] = av_bswap32(src[i + 7]);
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}
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for (; i < w; i++)
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dst[i + 0] = av_bswap32(src[i + 0]);
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}
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static void bswap16_buf(uint16_t *dst, const uint16_t *src, int len)
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{
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while (len--)
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*dst++ = av_bswap16(*src++);
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}
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av_cold void ff_bswapdsp_init(BswapDSPContext *c)
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{
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c->bswap_buf = bswap_buf;
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c->bswap16_buf = bswap16_buf;
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#if ARCH_X86
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ff_bswapdsp_init_x86(c);
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#endif
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}
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