[FFmpeg-devel] [PATCH 4/6] lavc/audiodsp: drop R-V F vector_clipf

["Rémi Denis-Courmont" <remi@remlab.net>]

This is now firmly slower than C.

SiFive-U74 (cycles):
audiodsp.vector_clipf_c:   31.2
audiodsp.vector_clipf_rvf: 39.5
---
 libavcodec/riscv/Makefile        |  1 -
 libavcodec/riscv/audiodsp_init.c |  8 +----
 libavcodec/riscv/audiodsp_rvf.S  | 50 --------------------------------
 3 files changed, 1 insertion(+), 58 deletions(-)
 delete mode 100644 libavcodec/riscv/audiodsp_rvf.S

diff --git a/libavcodec/riscv/Makefile b/libavcodec/riscv/Makefile
index 0bbdd38116..621c099a5b 100644
--- a/libavcodec/riscv/Makefile
+++ b/libavcodec/riscv/Makefile
@@ -9,7 +9,6 @@ RVVB-OBJS-$(CONFIG_AC3DSP) += riscv/ac3dsp_rvvb.o
 OBJS-$(CONFIG_ALAC_DECODER) += riscv/alacdsp_init.o
 RVV-OBJS-$(CONFIG_ALAC_DECODER) += riscv/alacdsp_rvv.o
 OBJS-$(CONFIG_AUDIODSP) += riscv/audiodsp_init.o
-RV-OBJS-$(CONFIG_AUDIODSP) += riscv/audiodsp_rvf.o
 RVV-OBJS-$(CONFIG_AUDIODSP) += riscv/audiodsp_rvv.o
 OBJS-$(CONFIG_BLOCKDSP) += riscv/blockdsp_init.o
 RVV-OBJS-$(CONFIG_BLOCKDSP) += riscv/blockdsp_rvv.o
diff --git a/libavcodec/riscv/audiodsp_init.c b/libavcodec/riscv/audiodsp_init.c
index f606406429..5750d4d8a7 100644
--- a/libavcodec/riscv/audiodsp_init.c
+++ b/libavcodec/riscv/audiodsp_init.c
@@ -24,8 +24,6 @@
 #include "libavutil/cpu.h"
 #include "libavcodec/audiodsp.h"
 
-void ff_vector_clipf_rvf(float *dst, const float *src, int len, float min, float max);
-
 int32_t ff_scalarproduct_int16_rvv(const int16_t *v1, const int16_t *v2, int len);
 void ff_vector_clip_int32_rvv(int32_t *dst, const int32_t *src, int32_t min,
                               int32_t max, unsigned int len);
@@ -33,12 +31,9 @@ void ff_vector_clipf_rvv(float *dst, const float *src, int len, float min, float
 
 av_cold void ff_audiodsp_init_riscv(AudioDSPContext *c)
 {
-#if HAVE_RV
+#if HAVE_RVV
     int flags = av_get_cpu_flags();
 
-    if (flags & AV_CPU_FLAG_RVF)
-        c->vector_clipf = ff_vector_clipf_rvf;
-#if HAVE_RVV
     if (flags & AV_CPU_FLAG_RVB_ADDR) {
         if (flags & AV_CPU_FLAG_RVV_I32) {
             c->scalarproduct_int16 = ff_scalarproduct_int16_rvv;
@@ -48,5 +43,4 @@ av_cold void ff_audiodsp_init_riscv(AudioDSPContext *c)
             c->vector_clipf = ff_vector_clipf_rvv;
     }
 #endif
-#endif
 }
diff --git a/libavcodec/riscv/audiodsp_rvf.S b/libavcodec/riscv/audiodsp_rvf.S
deleted file mode 100644
index 97aa930ab5..0000000000
--- a/libavcodec/riscv/audiodsp_rvf.S
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * 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
-        lpad    0
-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
-- 
2.45.2

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