mirror of
https://github.com/FFmpeg/FFmpeg.git
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46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/*
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* Copyright (c) 2021 Loongson Technology Corporation Limited
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* Contributed by Xiwei Gu <guxiwei-hf@loongson.cn>
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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 "libavcodec/videodsp.h"
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#include "libavutil/attributes.h"
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static void prefetch_loongarch(const uint8_t *mem, ptrdiff_t stride, int h)
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{
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register const uint8_t *p = mem;
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__asm__ volatile (
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"1: \n\t"
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"preld 0, %[p], 0 \n\t"
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"preld 0, %[p], 32 \n\t"
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"addi.d %[h], %[h], -1 \n\t"
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"add.d %[p], %[p], %[stride] \n\t"
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"blt $r0, %[h], 1b \n\t"
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: [p] "+r" (p), [h] "+r" (h)
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: [stride] "r" (stride)
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);
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}
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av_cold void ff_videodsp_init_loongarch(VideoDSPContext *ctx, int bpc)
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{
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ctx->prefetch = prefetch_loongarch;
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}
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