RVV: use new interface for segment load/store & change word_type to size_t&add clang ci (part #4100)

[thelastlin]

Tuple types in segment load/store operation have been removed from latest compilers.

This PR uses new interface for segment load/store, and add some wrapper for old compilers which only support tuple types.

This PR also change word_type to size_t, then add clang ci (riscv64-unknown-linux-gnu).

(Issue #4100)

[codecov-commenter]

Codecov Report

Merging #4118 (6612a44) into master (00c08d7) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4118      +/-   ##
==========================================
+ Coverage   94.43%   94.44%   +0.01%     
==========================================
  Files         748      750       +2     
  Lines      179005   179375     +370     
==========================================
+ Hits       169047   169417     +370     
  Misses       9958     9958              

Impacted Files	Coverage Δ
src/layer/riscv/padding_packn.h	100.00% <ø> (ø)
src/layer/riscv/riscv_activation.h	100.00% <ø> (ø)
src/layer/riscv/rvv_mathfun.h	100.00% <ø> (ø)
src/layer/riscv/rvv_mathfun_fp16s.h	100.00% <ø> (ø)
src/layer/riscv/absval_riscv.cpp	100.00% <100.00%> (ø)
src/layer/riscv/binaryop_riscv.cpp	100.00% <100.00%> (ø)
src/layer/riscv/cast_riscv.cpp	95.58% <100.00%> (ø)
src/layer/riscv/clip_riscv.cpp	100.00% <100.00%> (ø)
src/layer/riscv/concat_riscv.cpp	95.58% <100.00%> (ø)
src/layer/riscv/convolution1d_riscv.cpp	99.00% <100.00%> (ø)
... and 78 more

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[thelastlin]

Failed to pass tests when build with riscv-gcc/riscv-gcc-rvv-next(edffbea), binutils-2.39 :

test_convolution
test_convolution1d
test_convolutiondepthwise
test_deconvolution
test_deconvolutiondepthwise
test_squeezenet

[thelastlin]

Failed to pass tests when build with riscv-gcc/riscv-gcc-rvv-next(edffbea), binutils-2.39 :

Succeed with clang-14 with following requirement to build:

• Append some type definitions in riscv-vector.h;
• clang++ complains VLAs; [83d7d50]
• Need binutils-2.39 and other GNU toolchains (--gnu-toolchain=); [113052b]
• --ld-path= to ld in RISC-V GNU toolchains may required. [113052b]

[thelastlin]

Failed to pass tests when build with riscv-gcc/riscv-gcc-rvv-next(edffbea), binutils-2.39

Use riscv-gcc/riscv-gcc-rvv-next(32c7d7c), binutils-2.39 instead.

[zhongjuzhe]

Hi, would you mind telling me whether there is still some bugs when running your algorithm using the latest riscv-gcc-rvv-next.

If you encounter any bugs or performance issues,
feel free to file a issue here: https://github.com/riscv-collab/riscv-gcc/issues

Recently, I am working on push RVV codes to GCC upstream. Your feedbacks are important.

[nihui]

Thanks for your contribution !