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

* [FFmpeg-devel] [PATCH] lavu/fixed_dsp: unroll RISC-V V loop
@ 2023-07-14 19:54 Rémi Denis-Courmont
  0 siblings, 0 replies; only message in thread
From: Rémi Denis-Courmont @ 2023-07-14 19:54 UTC (permalink / raw)
  To: ffmpeg-devel

Before:
butterflies_fixed_c: 804.7
butterflies_fixed_rvv_i32: 348.2

After:
butterflies_fixed_rvv_i32: 308.7
---
 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)
-- 
2.40.1

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