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lavc/videodsp: RISC-V zicbop prefetch

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There are currently no ways to run-time detect the CPU capability, so we
take it for granted (in the worst case, it will execute NOPs).
This commit is contained in:
Rémi Denis-Courmont
2022-09-23 18:09:54 +03:00
parent 4570b9f3c4
commit 262168b04e
5 changed files with 75 additions and 0 deletions
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2
libavcodec/riscv/Makefile
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@@ -67,6 +67,8 @@ RVV-OBJS-$(CONFIG_UTVIDEO_DECODER) += riscv/utvideodsp_rvv.o
OBJS-$(CONFIG_VC1DSP) += riscv/vc1dsp_init.o
RV-OBJS-$(CONFIG_VC1DSP) += riscv/vc1dsp_rvi.o
RVV-OBJS-$(CONFIG_VC1DSP) += riscv/vc1dsp_rvv.o
OBJS-$(CONFIG_VIDEODSP) += riscv/videodsp_init.o
RV-OBJS-$(CONFIG_VIDEODSP) += riscv/videodsp.o
OBJS-$(CONFIG_VP7_DECODER) += riscv/vp7dsp_init.o
RVV-OBJS-$(CONFIG_VP7_DECODER) += riscv/vp7dsp_rvv.o
OBJS-$(CONFIG_VP8DSP) += riscv/vp8dsp_init.o

34
libavcodec/riscv/videodsp.S Normal file
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@@ -0,0 +1,34 @@
/*
* Copyright © 2022 Rémi Denis-Courmont.
*
* 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 "config.h"
#include "libavutil/riscv/asm.S"
#if HAVE_RV_ZICBOP
func ff_prefetch_rv_zicbop, zicbop
1:
addi a2, a2, -1
prefetch.r (a0)
add a0, a0, a1
bnez a2, 1b
ret
endfunc
#endif

36
libavcodec/riscv/videodsp_init.c Normal file
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@@ -0,0 +1,36 @@
/*
* 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 "config.h"
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavcodec/videodsp.h"
void ff_prefetch_rv_zicbop(const uint8_t *mem, ptrdiff_t stride, int h);
av_cold void ff_videodsp_init_riscv(VideoDSPContext *ctx, int bpc)
{
#if HAVE_RV_ZICBOP
/* TODO: Since we pay for the indirect function call anyway, we should
* only set this if Cache-Block Operation Prefetch (Zicbop) is actually
* supported and otherwise save a few cycles of NOPs.
* But so far there are no means to detect Zicbop (in user mode).
*/
ctx->prefetch = ff_prefetch_rv_zicbop;
#endif
}

2
libavcodec/videodsp.c
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@@ -51,6 +51,8 @@ av_cold void ff_videodsp_init(VideoDSPContext *ctx, int bpc)
ff_videodsp_init_arm(ctx, bpc);
#elif ARCH_PPC
ff_videodsp_init_ppc(ctx, bpc);
#elif ARCH_RISCV
ff_videodsp_init_riscv(ctx, bpc);
#elif ARCH_X86
ff_videodsp_init_x86(ctx, bpc);
#elif ARCH_MIPS

1
libavcodec/videodsp.h
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@@ -81,6 +81,7 @@ void ff_videodsp_init(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_aarch64(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_arm(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_ppc(VideoDSPContext *ctx, int bpc);
void ff_videodsp_init_riscv(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);