[FFmpeg-devel] [PATCH 1/2] lavc/vc1dsp: fuse multiply-adds in R-V V inv_trans_4

[Rémi Denis-Courmont]

---
 libavcodec/riscv/vc1dsp_rvv.S | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/libavcodec/riscv/vc1dsp_rvv.S b/libavcodec/riscv/vc1dsp_rvv.S
index 9d85377cec..8c127c7644 100644
--- a/libavcodec/riscv/vc1dsp_rvv.S
+++ b/libavcodec/riscv/vc1dsp_rvv.S
@@ -194,14 +194,12 @@ func ff_vc1_inv_trans_4_rvv, zve32x
         li      t4, 22
         vmul.vx v10, v2, t3
         li      t2, 10
-        vmul.vx v14, v1, t4
+        vmul.vx v26, v1, t4
+        vmul.vx v27, v3, t4
         vadd.vv v24, v8, v10  # t1
         vsub.vv v25, v8, v10  # t2
-        vmul.vx v16, v3, t2
-        vmul.vx v18, v3, t4
-        vmul.vx v20, v1, t2
-        vadd.vv v26, v14, v16 # t3
-        vsub.vv v27, v18, v20 # t4
+        vmacc.vx v26, t2, v3  # t3
+        vnmsac.vx v27, t2, v1 # t4
         vwadd.vv  v8, v24, v26
         vwsub.vv  v10, v25, v27
         vwadd.vv  v12, v25, v27
-- 
2.45.2