From: Rémi Denis-Courmont <r...@remlab.net>
---
libavutil/riscv/float_dsp_init.c | 2 ++
libavutil/riscv/float_dsp_rvv.S | 19 +++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/libavutil/riscv/float_dsp_init.c b/libavutil/riscv/float_dsp_init.c
index 2ddd2050f7..f164b1308f 100644
--- a/libavutil/riscv/float_dsp_init.c
+++ b/libavutil/riscv/float_dsp_init.c
@@ -33,6 +33,7 @@ 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_butterflies_float_rvv(float *v1, float *v2, int len);
void ff_vector_dmul_rvv(double *dst, const double *src0, const double *src1,
int len);
@@ -51,6 +52,7 @@ 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->butterflies_float = ff_butterflies_float_rvv;
if (flags & AV_CPU_FLAG_RV_ZVE64D) {
fdsp->vector_dmul = ff_vector_dmul_rvv;
diff --git a/libavutil/riscv/float_dsp_rvv.S b/libavutil/riscv/float_dsp_rvv.S
index 9b68187e01..0366009213 100644
--- a/libavutil/riscv/float_dsp_rvv.S
+++ b/libavutil/riscv/float_dsp_rvv.S
@@ -96,6 +96,25 @@ func ff_vector_fmul_add_rvv, zve32f
ret
endfunc
+// (a0) = (a0) + (a1), (a1) = (a0) - (a1) [0..a2-1]
+func ff_butterflies_float_rvv, zve32f
+1:
+ vsetvli t0, a2, e32, m1, ta, ma
+ slli t1, t0, 2
+ vle32.v v16, (a0)
+ vle32.v v24, (a1)
+ vfadd.vv v0, v16, v24
+ vfsub.vv v8, v16, v24
+ sub a2, a2, t0
+ vse32.v v0, (a0)
+ add a0, a0, t1
+ vse32.v v8, (a1)
+ add a1, a1, t1
+ bnez a2, 1b
+
+ ret
+endfunc
+
// (a0) = (a1) * (a2) [0..a3-1]
func ff_vector_dmul_rvv, zve64d
1:
--
2.37.2
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