[FFmpeg-cvslog] lavc/h264dsp: stick R-V V weight to 16-bit precision
Rémi Denis-Courmont
git at videolan.org
Fri Aug 2 21:24:41 EEST 2024
ffmpeg | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Tue Jul 30 20:29:02 2024 +0300| [677f28b310ac8cbf96e3a02865c2aff49c6950ff] | committer: Rémi Denis-Courmont
lavc/h264dsp: stick R-V V weight to 16-bit precision
T-Head C908 (ns):
h264_weight2_8_c: 1607.8
h264_weight2_8_rvv_i32: 515.0 (before)
h264_weight2_8_rvv_i32: 348.5 (after)
h264_weight4_8_c: 2255.8
h264_weight4_8_rvv_i32: 1015.0 (before)
h264_weight4_8_rvv_i32: 691.0 (after)
h264_weight8_8_c: 3857.5
h264_weight8_8_rvv_i32: 2218.8 (before)
h264_weight8_8_rvv_i32: 1561.3 (after)
h264_weight16_8_c: 7431.5
h264_weight16_8_rvv_i32: 2737.3 (before)
h264_weight16_8_rvv_i32: 1848.3 (after)
SpacemiT X60 (ns):
h264_weight2_8_c: 1624.1
h264_weight2_8_rvv_i32: 352.6 (before)
h264_weight2_8_rvv_i32: 259.3 (after)
h264_weight4_8_c: 2259.3
h264_weight4_8_rvv_i32: 685.8 (before)
h264_weight4_8_rvv_i32: 530.3 (after)
h264_weight8_8_c: 4103.3
h264_weight8_8_rvv_i32: 1581.8 (before)
h264_weight8_8_rvv_i32: 1238.6 (after)
h264_weight16_8_c: 7624.3
h264_weight16_8_rvv_i32: 2738.1 (before)
h264_weight16_8_rvv_i32: 1853.3 (after)
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=677f28b310ac8cbf96e3a02865c2aff49c6950ff
---
libavcodec/riscv/h264dsp_rvv.S | 37 ++++++++++++++++---------------------
1 file changed, 16 insertions(+), 21 deletions(-)
diff --git a/libavcodec/riscv/h264dsp_rvv.S b/libavcodec/riscv/h264dsp_rvv.S
index 0e08de43e4..0d641008cb 100644
--- a/libavcodec/riscv/h264dsp_rvv.S
+++ b/libavcodec/riscv/h264dsp_rvv.S
@@ -32,17 +32,15 @@ func ff_h264_weight_pixels_simple_8_rvv, zve32x
csrwi vxrm, 0
sll a5, a5, a3
1:
- vsetvli zero, a6, e32, m4, ta, ma
+ vsetvli zero, a6, e16, m2, ta, ma
vle8.v v8, (a0)
addi a2, a2, -1
- vmv.v.x v16, a5
- vsetvli zero, zero, e16, m2, ta, ma
vzext.vf2 v24, v8
- vwmaccsu.vx v16, a4, v24
- vnclip.wx v16, v16, a3
+ vmul.vx v16, v24, a4
+ vsadd.vx v16, v16, a5
vmax.vx v16, v16, zero
vsetvli zero, zero, e8, m1, ta, ma
- vnclipu.wi v8, v16, 0
+ vnclipu.wx v8, v16, a3
vse8.v v8, (a0)
add a0, a0, a1
bnez a2, 1b
@@ -85,23 +83,20 @@ func ff_h264_weight_pixels_8_rvv, zve32x
mv t0, a0
mv t6, a6
2:
- vsetvli t2, a2, e32, m8, ta, ma
+ vsetvli t2, a2, e16, m8, ta, ma
vlsseg2e8.v v0, (t0), a1
addi t6, t6, -2
- vmv.v.x v16, a5
- vmv.v.x v24, a5
- vsetvli zero, zero, e16, m4, ta, ma
- vzext.vf2 v8, v0
- vzext.vf2 v12, v2
- vwmaccsu.vx v16, a4, v8
- vwmaccsu.vx v24, a4, v12
- vnclip.wx v8, v16, a3
- vnclip.wx v12, v24, a3
- vmax.vx v8, v8, zero
- vmax.vx v12, v12, zero
- vsetvli zero, zero, e8, m2, ta, ma
- vnclipu.wi v0, v8, 0
- vnclipu.wi v2, v12, 0
+ vzext.vf2 v16, v0
+ vzext.vf2 v24, v4
+ vmul.vx v16, v16, a4
+ vmul.vx v24, v24, a4
+ vsadd.vx v16, v16, a5
+ vsadd.vx v24, v24, a5
+ vmax.vx v16, v16, zero
+ vmax.vx v24, v24, zero
+ vsetvli zero, zero, e8, m4, ta, ma
+ vnclipu.wx v0, v16, a3
+ vnclipu.wx v4, v24, a3
vssseg2e8.v v0, (t0), a1
addi t0, t0, 2
bnez t6, 2b
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