[FFmpeg-devel] [PATCH] lavc/vorbisdsp: unroll RISC-V V inverse_coupling

[FFmpeg-devel] [PATCH] lavc/vorbisdsp: unroll RISC-V V inverse_coupling

[Rémi Denis-Courmont]

This increases the group multiplier as per T-Head C910 benchmarks:

inverse_coupling_c: 4597.0
inverse_coupling_rvv_i32: 1312.7 (m1)
inverse_coupling_rvv_i32: 1116.7 (m2)
inverse_coupling_rvv_i32: 732.2  (m4)
inverse_coupling_rvv_i32: 898.0  (m8)
---
 libavcodec/riscv/vorbisdsp_rvv.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/riscv/vorbisdsp_rvv.S b/libavcodec/riscv/vorbisdsp_rvv.S
index f45e7dc2f1..81a6c62a65 100644
--- a/libavcodec/riscv/vorbisdsp_rvv.S
+++ b/libavcodec/riscv/vorbisdsp_rvv.S
@@ -23,7 +23,7 @@
 func ff_vorbis_inverse_coupling_rvv, zve32f
         fmv.w.x   ft0, zero
 1:
-        vsetvli   t0, a2, e32, m1, ta, ma
+        vsetvli   t0, a2, e32, m4, ta, ma
         vle32.v   v16, (a1)
         sub       a2, a2, t0
         vle32.v   v24, (a0)
-- 
2.40.1

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