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>
74 lines
1.8 KiB
C
74 lines
1.8 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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/**
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* @file
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* Scene SAD functions
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*/
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#include "scene_sad.h"
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void ff_scene_sad16_c(SCENE_SAD_PARAMS)
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{
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uint64_t sad = 0;
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const uint16_t *src1w = (const uint16_t *)src1;
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const uint16_t *src2w = (const uint16_t *)src2;
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int x, y;
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stride1 /= 2;
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stride2 /= 2;
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for (y = 0; y < height; y++) {
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for (x = 0; x < width; x++)
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sad += FFABS(src1w[x] - src2w[x]);
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src1w += stride1;
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src2w += stride2;
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}
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*sum = sad;
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}
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void ff_scene_sad_c(SCENE_SAD_PARAMS)
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{
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uint64_t sad = 0;
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int x, y;
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for (y = 0; y < height; y++) {
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for (x = 0; x < width; x++)
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sad += FFABS(src1[x] - src2[x]);
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src1 += stride1;
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src2 += stride2;
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}
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*sum = sad;
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}
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ff_scene_sad_fn ff_scene_sad_get_fn(int depth)
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{
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ff_scene_sad_fn sad = NULL;
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#if ARCH_X86
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sad = ff_scene_sad_get_fn_x86(depth);
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#endif
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if (!sad) {
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if (depth == 8)
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sad = ff_scene_sad_c;
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if (depth == 16)
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sad = ff_scene_sad16_c;
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}
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return sad;
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}
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