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avcodec: [loongarch] Optimize prefetch with loongarch.

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./ffmpeg -i ../1_h264_1080p_30fps_3Mbps.mp4 -f rawvideo -y /dev/null -an
before:296
after :308

Reviewed-by: 殷时友 <yinshiyou-hf@loongson.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
gxw 2021-12-29 18:18:22 +08:00 committed by Michael Niedermayer
parent 555b850bd5
commit 8ca7d474c1
4 changed files with 49 additions and 0 deletions
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1
libavcodec/loongarch/Makefile
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@ -7,6 +7,7 @@ OBJS-$(CONFIG_VP9_DECODER) += loongarch/vp9dsp_init_loongarch.o
OBJS-$(CONFIG_VC1DSP) += loongarch/vc1dsp_init_loongarch.o
OBJS-$(CONFIG_HPELDSP) += loongarch/hpeldsp_init_loongarch.o
OBJS-$(CONFIG_IDCTDSP) += loongarch/idctdsp_init_loongarch.o
OBJS-$(CONFIG_VIDEODSP) += loongarch/videodsp_init.o
LASX-OBJS-$(CONFIG_H264CHROMA) += loongarch/h264chroma_lasx.o
LASX-OBJS-$(CONFIG_H264QPEL) += loongarch/h264qpel_lasx.o
LASX-OBJS-$(CONFIG_H264DSP) += loongarch/h264dsp_lasx.o \

45
libavcodec/loongarch/videodsp_init.c Normal file
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@ -0,0 +1,45 @@
/*
* Copyright (c) 2021 Loongson Technology Corporation Limited
* Contributed by Xiwei Gu <guxiwei-hf@loongson.cn>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/videodsp.h"
#include "libavutil/attributes.h"
static void prefetch_loongarch(uint8_t *mem, ptrdiff_t stride, int h)
{
register const uint8_t *p = mem;
__asm__ volatile (
"1: \n\t"
"preld 0, %[p], 0 \n\t"
"preld 0, %[p], 32 \n\t"
"addi.d %[h], %[h], -1 \n\t"
"add.d %[p], %[p], %[stride] \n\t"
"blt $r0, %[h], 1b \n\t"
: [p] "+r" (p), [h] "+r" (h)
: [stride] "r" (stride)
);
}
av_cold void ff_videodsp_init_loongarch(VideoDSPContext *ctx, int bpc)
{
ctx->prefetch = prefetch_loongarch;
}

2
libavcodec/videodsp.c
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@ -54,4 +54,6 @@ av_cold void ff_videodsp_init(VideoDSPContext *ctx, int bpc)
ff_videodsp_init_x86(ctx, bpc);
if (ARCH_MIPS)
ff_videodsp_init_mips(ctx, bpc);
if (ARCH_LOONGARCH64)
ff_videodsp_init_loongarch(ctx, bpc);
}

1
libavcodec/videodsp.h
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@ -84,5 +84,6 @@ void ff_videodsp_init_arm(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_ppc(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_x86(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_mips(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_loongarch(VideoDSPContext *ctx, int bpc);
#endif /* AVCODEC_VIDEODSP_H */