From: Rémi Denis-Courmont <r...@remlab.net>
---
libavutil/riscv/float_dsp_init.c | 3 +++
libavutil/riscv/float_dsp_rvv.S | 22 ++++++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/libavutil/riscv/float_dsp_init.c b/libavutil/riscv/float_dsp_init.c
index 2165394585..1183460181 100644
--- a/libavutil/riscv/float_dsp_init.c
+++ b/libavutil/riscv/float_dsp_init.c
@@ -30,6 +30,8 @@ void ff_vector_fmul_scalar_rvv(float *dst, const float *src,
float mul,
int len);
void ff_vector_fmul_add_rvv(float *dst, const float *src0, const float *src1,
const float *src2, int len);
+void ff_vector_fmul_reverse_rvv(float *dst, const float *src0,
+ const float *src1, int len);
void ff_butterflies_float_rvv(float *v1, float *v2, int len);
void ff_vector_dmul_rvv(double *dst, const double *src0, const double *src1,
@@ -48,6 +50,7 @@ av_cold void ff_float_dsp_init_riscv(AVFloatDSPContext *fdsp)
fdsp->vector_fmac_scalar = ff_vector_fmac_scalar_rvv;
fdsp->vector_fmul_scalar = ff_vector_fmul_scalar_rvv;
fdsp->vector_fmul_add = ff_vector_fmul_add_rvv;
+ fdsp->vector_fmul_reverse = ff_vector_fmul_reverse_rvv;
fdsp->butterflies_float = ff_butterflies_float_rvv;
if (flags & AV_CPU_FLAG_ZVE64D) {
diff --git a/libavutil/riscv/float_dsp_rvv.S b/libavutil/riscv/float_dsp_rvv.S
index 1c3b08b94f..b376392294 100644
--- a/libavutil/riscv/float_dsp_rvv.S
+++ b/libavutil/riscv/float_dsp_rvv.S
@@ -92,6 +92,28 @@ func ff_vector_fmul_add_rvv, zve32f
ret
endfunc
+// (a0) = (a1) * reverse(a2) [0..a3-1]
+func ff_vector_fmul_reverse_rvv, zve32f
+ add t3, a3, -1
+ li t2, -4 // byte stride
+ slli t3, t3, 2
+ add a2, a2, t3
+
+1: vsetvli t0, a3, e32, m8, ta, ma
+ slli t1, t0, 2
+ vle32.v v16, (a1)
+ add a1, a1, t1
+ vlse32.v v24, (a2), t2
+ sub a2, a2, t1
+ vfmul.vv v16, v16, v24
+ sub a3, a3, t0
+ vse32.v v16, (a0)
+ add a0, a0, t1
+ bnez a3, 1b
+
+ ret
+endfunc
+
// (a0) = (a0) + (a1), (a1) = (a0) - (a1) [0..a2-1]
func ff_butterflies_float_rvv, zve32f
1: vsetvli t0, a2, e32, m8, ta, ma
--
2.37.2
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