[FFmpeg-devel] [PATCH 2/2] lavc/vc1dsp: fuse multiply-adds in R-V V inv_trans_8
Rémi Denis-Courmont
remi at remlab.net
Sun Jun 30 14:54:56 EEST 2024
---
libavcodec/riscv/vc1dsp_rvv.S | 63 +++++++++++++++--------------------
1 file changed, 27 insertions(+), 36 deletions(-)
diff --git a/libavcodec/riscv/vc1dsp_rvv.S b/libavcodec/riscv/vc1dsp_rvv.S
index 8c127c7644..d8b62579aa 100644
--- a/libavcodec/riscv/vc1dsp_rvv.S
+++ b/libavcodec/riscv/vc1dsp_rvv.S
@@ -116,55 +116,46 @@ endfunc
.variant_cc ff_vc1_inv_trans_8_rvv
func ff_vc1_inv_trans_8_rvv, zve32x
li t4, 12
- vsll.vi v18, v6, 4
+ vsll.vi v14, v6, 4
li t2, 6
- vmul.vx v8, v0, t4
+ vsll.vi v12, v2, 4
li t5, 15
- vmul.vx v10, v4, t4
+ vmul.vx v8, v0, t4
li t3, 9
# t[2..5] = [6 9 12 15]
- vsll.vi v12, v2, 4
- vmul.vx v14, v6, t2
+ vmul.vx v10, v4, t4
vmul.vx v16, v2, t2
- vadd.vv v26, v12, v14 # t3
+ vmacc.vx v12, t2, v6 # t3
+ vnmsac.vx v14, t2, v2 # -t4
vadd.vv v24, v8, v10 # t1
vsub.vv v25, v8, v10 # t2
- vsub.vv v27, v16, v18 # t4
- vadd.vv v28, v24, v26 # t5
- vsub.vv v31, v24, v26 # t8
- vadd.vv v29, v25, v27 # t6
- vsub.vv v30, v25, v27 # t7
+ vadd.vv v28, v24, v12 # t5
+ vsub.vv v31, v24, v12 # t8
+ vsub.vv v29, v25, v14 # t6
+ vadd.vv v30, v25, v14 # t7
vsll.vi v20, v1, 4
- vmul.vx v21, v3, t5
- vmul.vx v22, v5, t3
- vsll.vi v23, v7, 2
- vadd.vv v20, v20, v21
- vadd.vv v22, v22, v23
+ vsll.vi v22, v7, 2
+ vmacc.vx v20, t5, v3
+ vmacc.vx v22, t3, v5
vsll.vi v21, v3, 2
+ vsll.vi v23, v5, 4
vadd.vv v24, v20, v22 # t1
- vmul.vx v20, v1, t5
- vsll.vi v22, v5, 4
- vmul.vx v23, v7, t3
- vsub.vv v20, v20, v21
- vadd.vv v22, v22, v23
- vsll.vi v21, v3, 4
- vsub.vv v25, v20, v22 # t2
- vmul.vx v20, v1, t3
+ vnmsac.vx v21, t5, v1
+ vmacc.vx v23, t3, v7
+ vsll.vi v20, v3, 4
vsll.vi v22, v5, 2
- vmul.vx v23, v7, t5
- vsub.vv v20, v20, v21
- vadd.vv v22, v22, v23
- vmul.vx v21, v3, t3
- vadd.vv v26, v20, v22 # t3
- vsll.vi v20, v1, 2
- vmul.vx v22, v5, t5
+ vadd.vv v25, v21, v23 # -t2
+ vnmsac.vx v20, t3, v1
+ vmacc.vx v22, t5, v7
+ vsll.vi v21, v1, 2
vsll.vi v23, v7, 4
- vsub.vv v20, v20, v21
- vsub.vv v22, v22, v23
- vadd.vv v27, v20, v22 # t4
+ vsub.vv v26, v22, v20 # t3
+ vnmsac.vx v21, t3, v3
+ vnmsac.vx v23, t5, v5
srli t2, t1, 2
vwadd.vv v8, v28, v24
- vwadd.vv v10, v29, v25
+ vwsub.vv v10, v29, v25
+ vsub.vv v27, v21, v23 # t4
vwadd.vv v12, v30, v26
vwadd.vv v14, v31, v27
beqz t2, 1f # faster than 4x add t2=zero
@@ -174,7 +165,7 @@ func ff_vc1_inv_trans_8_rvv, zve32x
1:
vwsub.vv v16, v31, v27
vwsub.vv v18, v30, v26
- vwsub.vv v20, v29, v25
+ vwadd.vv v20, v29, v25
vwsub.vv v22, v28, v24
vnclip.wx v0, v8, t1
vnclip.wx v1, v10, t1
--
2.45.2
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