From: sunyuechi <sunyue...@iscas.ac.cn>
Since len < 64, the registers are sufficient, so it can be
directly unrolled (a4 is even).
Another benefit of unrolling is that it reduces one load operation
vertically compared to horizontally.
old new
C908 X60 C908 X60
vp8_put_bilin4_h_c : 6.2 5.5 : 6.2 5.5
vp8_put_bilin4_h_rvv_i32 : 2.2 2.0 : 1.5 1.5
vp8_put_bilin4_v_c : 6.5 5.7 : 6.2 5.7
vp8_put_bilin4_v_rvv_i32 : 2.2 2.0 : 1.2 1.5
vp8_put_bilin8_h_c : 24.2 21.5 : 24.2 21.5
vp8_put_bilin8_h_rvv_i32 : 5.2 4.7 : 3.5 3.5
vp8_put_bilin8_v_c : 24.5 21.7 : 24.5 21.7
vp8_put_bilin8_v_rvv_i32 : 5.2 4.7 : 3.5 3.2
vp8_put_bilin16_h_c : 48.0 42.7 : 48.0 42.7
vp8_put_bilin16_h_rvv_i32 : 5.7 5.0 : 5.2 4.5
vp8_put_bilin16_v_c : 48.2 43.0 : 48.2 42.7
vp8_put_bilin16_v_rvv_i32 : 5.7 5.2 : 4.5 4.2
---
libavcodec/riscv/vp8dsp_rvv.S | 34 +++++++++++++++++++++++++++++-----
1 file changed, 29 insertions(+), 5 deletions(-)
diff --git a/libavcodec/riscv/vp8dsp_rvv.S b/libavcodec/riscv/vp8dsp_rvv.S
index 3360a38cac..5bea6cba9c 100644
--- a/libavcodec/riscv/vp8dsp_rvv.S
+++ b/libavcodec/riscv/vp8dsp_rvv.S
@@ -172,11 +172,35 @@ func ff_put_vp8_bilin4_\type\()_rvv, zve32x
li t4, 4
sub t1, t1, \mn
1:
- addi a4, a4, -1
- bilin_load v0, \type, \mn
- vse8.v v0, (a0)
- add a2, a2, a3
- add a0, a0, a1
+ add t0, a2, a3
+ add t2, a0, a1
+ addi a4, a4, -2
+.ifc \type,v
+ add t3, t0, a3
+.else
+ addi t5, a2, 1
+ addi t3, t0, 1
+ vle8.v v2, (t5)
+.endif
+ vle8.v v0, (a2)
+ vle8.v v4, (t0)
+ vle8.v v6, (t3)
+ vwmulu.vx v28, v0, t1
+ vwmulu.vx v26, v4, t1
+.ifc \type,v
+ vwmaccu.vx v28, \mn, v4
+.else
+ vwmaccu.vx v28, \mn, v2
+.endif
+ vwmaccu.vx v26, \mn, v6
+ vwaddu.wx v24, v28, t4
+ vwaddu.wx v22, v26, t4
+ vnsra.wi v30, v24, 3
+ vnsra.wi v0, v22, 3
+ vse8.v v30, (a0)
+ vse8.v v0, (t2)
+ add a2, t0, a3
+ add a0, t2, a1
bnez a4, 1b
ret
--
2.45.1
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