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lavc/h264dsp: unroll R-V V weight16

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As VLSE128.V does not exist, we have no other way to deal with latency.

T-Head C908:
h264_weight16_8_c:                                     989.4 ( 1.00x)
h264_weight16_8_rvv_i32:                               193.2 ( 5.12x)

SpacemiT X60:
h264_weight16_8_c:                                     874.1 ( 1.00x)
h264_weight16_8_rvv_i32:                               196.9 ( 4.44x)
This commit is contained in:
Rémi Denis-Courmont 2024-09-01 16:31:13 +03:00
parent 4936bb2508
commit 459a1512f1
2 changed files with 16 additions and 7 deletions
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2
libavcodec/riscv/h264dsp_init.c
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@ -97,7 +97,7 @@ av_cold void ff_h264dsp_init_riscv(H264DSPContext *dsp, const int bit_depth,
const bool zvl128b = ff_rv_vlen_least(128);
if (bit_depth == 8) {
if (zvl128b)
if (zvl128b && (flags & AV_CPU_FLAG_RVB))
dsp->weight_h264_pixels_tab[0] =
ff_h264_weight_funcs_8_rvv[0].weight;
if (flags & AV_CPU_FLAG_RVV_I64)