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lavc/h264dsp: stick R-V V weight to 16-bit precision

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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)
This commit is contained in:
Rémi Denis-Courmont 2024-07-30 20:29:02 +03:00
parent afd45c7ff7
commit 677f28b310
1 changed files with 16 additions and 21 deletions
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37
libavcodec/riscv/h264dsp_rvv.S
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@ -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