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lavc/audiodsp: RISC-V F vector_clipf

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RV64G supports MIN & MAX instructions natively only on floating point
registers, not general purpose ones. The later would require the Zbb
extension. Due to that, it is actually faster to perform the clipping
"properly" in FPU.

Benchmarks on SiFive U74-MC (courtesy of Shanghai StarFive Tech):
audiodsp.vector_clipf_c: 29551.5
audiodsp.vector_clipf_rvf: 17871.0

Also tried unrolling with 2 or 8 elements but it gets worse either way.
This commit is contained in:
Rémi Denis-Courmont 2022-09-26 17:52:23 +03:00 committed by Lynne
parent 746f1ff36a
commit 04d092e7d5
5 changed files with 87 additions and 0 deletions
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2
libavcodec/audiodsp.c
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@ -113,6 +113,8 @@ av_cold void ff_audiodsp_init(AudioDSPContext *c)
ff_audiodsp_init_arm(c);
#elif ARCH_PPC
ff_audiodsp_init_ppc(c);
#elif ARCH_RISCV
ff_audiodsp_init_riscv(c);
#elif ARCH_X86
ff_audiodsp_init_x86(c);
#endif

1
libavcodec/audiodsp.h
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@ -55,6 +55,7 @@ typedef struct AudioDSPContext {
void ff_audiodsp_init(AudioDSPContext *c);
void ff_audiodsp_init_arm(AudioDSPContext *c);
void ff_audiodsp_init_ppc(AudioDSPContext *c);
void ff_audiodsp_init_riscv(AudioDSPContext *c);
void ff_audiodsp_init_x86(AudioDSPContext *c);
#endif /* AVCODEC_AUDIODSP_H */

2
libavcodec/riscv/Makefile Normal file
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@ -0,0 +1,2 @@
OBJS-$(CONFIG_AUDIODSP) += riscv/audiodsp_init.o \
riscv/audiodsp_rvf.o

33
libavcodec/riscv/audiodsp_init.c Normal file
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@ -0,0 +1,33 @@
/*
* 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 "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavcodec/audiodsp.h"
void ff_vector_clipf_rvf(float *dst, const float *src, int len, float min, float max);
av_cold void ff_audiodsp_init_riscv(AudioDSPContext *c)
{
int flags = av_get_cpu_flags();
if (flags & AV_CPU_FLAG_RVF)
c->vector_clipf = ff_vector_clipf_rvf;
}

49
libavcodec/riscv/audiodsp_rvf.S Normal file
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@ -0,0 +1,49 @@
/*
* 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 "libavutil/riscv/asm.S"
func ff_vector_clipf_rvf, f
NOHWF fmv.w.x fa0, a3
NOHWF fmv.w.x fa1, a4
1:
flw ft0, (a1)
flw ft1, 4(a1)
fmax.s ft0, ft0, fa0
flw ft2, 8(a1)
fmax.s ft1, ft1, fa0
flw ft3, 12(a1)
fmax.s ft2, ft2, fa0
addi a2, a2, -4
fmax.s ft3, ft3, fa0
addi a1, a1, 16
fmin.s ft0, ft0, fa1
fmin.s ft1, ft1, fa1
fsw ft0, (a0)
fmin.s ft2, ft2, fa1
fsw ft1, 4(a0)
fmin.s ft3, ft3, fa1
fsw ft2, 8(a0)
fsw ft3, 12(a0)
addi a0, a0, 16
bnez a2, 1b
ret
endfunc