T-Head C908 (cycles):
vp7_idct_dc_add_c: 108.5
vp7_idct_dc_add_rvv_i32: 56.2 (before)
vp7_idct_dc_add_rvv_i32: 47.2 (after)
vp8_idct_dc_add_c: 96.2
vp8_idct_dc_add_rvv_i32: 43.0 (before)
vp8_idct_dc_add_rvv_i32: 34.0 (after)
---
libavcodec/riscv/vp8dsp_rvv.S | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/libavcodec/riscv/vp8dsp_rvv.S b/libavcodec/riscv/vp8dsp_rvv.S
index e50e27ce82..67b54c0035 100644
--- a/libavcodec/riscv/vp8dsp_rvv.S
+++ b/libavcodec/riscv/vp8dsp_rvv.S
@@ -169,12 +169,18 @@ func ff_vp78_idct_dc_add_rvv, zve32x
vsetivli zero, 4, e8, mf4, ta, ma
sh zero, (a1)
vlse32.v v8, (a0), a2
- vsetivli zero, 16, e16, m2, ta, ma
- vzext.vf2 v16, v8
- vadd.vx v16, v16, a3
- vmax.vx v16, v16, zero
- vsetvli zero, zero, e8, m1, ta, ma
- vnclipu.wi v8, v16, 0
+ vsetivli zero, 16, e8, m1, ta, ma
+ bgez a3, 1f
+
+ # block[0] < 0
+ neg a3, a3
+ vssubu.vx v8, v8, a3
+ vsetivli zero, 4, e8, mf4, ta, ma
+ vsse32.v v8, (a0), a2
+ ret
+
+1: # block[0] >= 0
+ vsaddu.vx v8, v8, a3
vsetivli zero, 4, e8, mf4, ta, ma
vsse32.v v8, (a0), a2
ret
--
2.45.2
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