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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>
61 lines
2.1 KiB
C
61 lines
2.1 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 "libavutil/attributes.h"
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#include "ttaencdsp.h"
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#include "config.h"
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static void ttaenc_filter_process_c(int32_t *qm, int32_t *dx, int32_t *dl,
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int32_t *error, int32_t *in, int32_t shift,
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int32_t round) {
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if (*error < 0) {
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qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3];
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qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7];
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} else if (*error > 0) {
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qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3];
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qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7];
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}
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round += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] +
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dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7];
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dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4];
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dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4];
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dx[4] = ((dl[4] >> 30) | 1);
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dx[5] = ((dl[5] >> 30) | 2) & ~1;
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dx[6] = ((dl[6] >> 30) | 2) & ~1;
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dx[7] = ((dl[7] >> 30) | 4) & ~3;
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dl[4] = -dl[5]; dl[5] = -dl[6];
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dl[6] = *in - dl[7]; dl[7] = *in;
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dl[5] += dl[6]; dl[4] += dl[5];
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*in -= (round >> shift);
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*error = *in;
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}
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av_cold void ff_ttaencdsp_init(TTAEncDSPContext *c)
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{
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c->filter_process = ttaenc_filter_process_c;
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#if ARCH_X86
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ff_ttaencdsp_init_x86(c);
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#endif
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}
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