[FFmpeg-cvslog] lavu/fixed_dsp: unroll RISC-V V loop

[Rémi Denis-Courmont]

ffmpeg | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Fri Jul 14 22:53:35 2023 +0300| [3d79afbe700ade76b77de84245f22010e65ce1bb] | committer: Rémi Denis-Courmont

lavu/fixed_dsp: unroll RISC-V V loop

Before:
butterflies_fixed_c: 804.7
butterflies_fixed_rvv_i32: 348.2

After:
butterflies_fixed_rvv_i32: 308.7

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3d79afbe700ade76b77de84245f22010e65ce1bb
---

 libavutil/riscv/fixed_dsp_rvv.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavutil/riscv/fixed_dsp_rvv.S b/libavutil/riscv/fixed_dsp_rvv.S
index a91316e1da..6e13395294 100644
--- a/libavutil/riscv/fixed_dsp_rvv.S
+++ b/libavutil/riscv/fixed_dsp_rvv.S
@@ -23,7 +23,7 @@
 // (a0) = (a0) + (a1), (a1) = (a0) - (a1) [0..a2-1]
 func ff_butterflies_fixed_rvv, zve32x
 1:
-        vsetvli t0, a2, e32, m1, ta, ma
+        vsetvli t0, a2, e32, m4, ta, ma
         vle32.v v16, (a0)
         sub     a2, a2, t0
         vle32.v v24, (a1)