RVV: Shuffle Channel

[thelastlin]

RVV: Shuffle Channel, fp32/fp16/bf16, with elempack support

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.60%. Comparing base (b10c9dd) to head (0449e2e).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4907      +/-   ##
==========================================
- Coverage   95.77%   95.60%   -0.18%     
==========================================
  Files         743      704      -39     
  Lines      249816   241982    -7834     
==========================================
- Hits       239271   231344    -7927     
- Misses      10545    10638      +93     

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[nihui]

其实 shufflechannel 优化挺难的，加油

[thelastlin]

newlib-rv64gc-gcc failed due to the compiler not supporting some RISC-V Vector intrinsics like vlm_v_b8 or vset_v_f32m1_f32m4.

But it seems that the compiler shouldn't enable RVV intrinsics support at this CI, or we might need upgrade the compiler used by this CI?

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
0 out of 2 committers have signed the CLA.

❌ thelastlin
❌ nihui
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[github-actions]

The binary size change of libncnn.so (bytes)

architecture	base size	pr size	difference
x86_64	15643128	15643128	0 😘
armhf	6648220	6648220	0 😘
aarch64	9986896	9986896	0 😘

[nihui]

closed for #6243 merged