Optimize slide_hash using RVV

[alexsifivetw]

We use upstream toolchain and run it on SiFive internal FPGA /w p470 bitstream:

Benchmark	Speedup (RVV / Scalar)
slide_hash/1024	7.727057765
slide_hash/2048	8.157694973
slide_hash/4096	8.529243135
slide_hash/8192	8.598595279
slide_hash/16384	8.149867804
slide_hash/32768	7.753176293

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (afd2a0c) 83.88% compared to head (867d76b) 83.90%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1522      +/-   ##
===========================================
+ Coverage    83.88%   83.90%   +0.01%     
===========================================
  Files          132      132              
  Lines        10841    10841              
  Branches      2792     2792              
===========================================
+ Hits          9094     9096       +2     
+ Misses        1048     1045       -3     
- Partials       699      700       +1     

Flag	Coverage Δ
macos_clang	42.97% <ø> (ø)
macos_gcc	73.69% <ø> (ø)
ubuntu_clang	82.53% <ø> (ø)
ubuntu_clang_debug	82.16% <ø> (ø)
ubuntu_clang_inflate_allow_invalid_dist	81.95% <ø> (-0.23%)	⬇️
ubuntu_clang_inflate_strict	82.52% <ø> (ø)
ubuntu_clang_mmap	82.85% <ø> (ø)
ubuntu_clang_pigz	14.16% <ø> (-0.06%)	⬇️
ubuntu_clang_pigz_no_optim	11.61% <ø> (ø)
ubuntu_clang_pigz_no_threads	14.03% <ø> (+0.05%)	⬆️
ubuntu_clang_reduced_mem	82.70% <ø> (-0.23%)	⬇️
ubuntu_clang_toolchain_riscv	∅ <ø> (∅)
ubuntu_gcc	75.32% <ø> (ø)
ubuntu_gcc_aarch64	77.43% <ø> (ø)
ubuntu_gcc_aarch64_compat_no_opt	75.71% <ø> (?)
ubuntu_gcc_aarch64_no_acle	76.24% <ø> (ø)
ubuntu_gcc_aarch64_no_neon	76.24% <ø> (ø)
ubuntu_gcc_armhf	77.50% <ø> (ø)
ubuntu_gcc_armhf_compat_no_opt	75.66% <ø> (-0.02%)	⬇️
ubuntu_gcc_armhf_no_acle	77.45% <ø> (ø)
ubuntu_gcc_armhf_no_neon	77.35% <ø> (ø)
ubuntu_gcc_armsf	74.82% <ø> (ø)
ubuntu_gcc_armsf_compat_no_opt	74.30% <ø> (+0.01%)	⬆️
ubuntu_gcc_benchmark	73.72% <ø> (ø)
ubuntu_gcc_compat_no_opt	76.88% <ø> (+0.01%)	⬆️
ubuntu_gcc_compat_sprefix	73.75% <ø> (ø)
ubuntu_gcc_m32	73.54% <ø> (+0.15%)	⬆️
ubuntu_gcc_mingw_i686	73.60% <ø> (ø)
ubuntu_gcc_mingw_x86_64	73.60% <ø> (-0.16%)	⬇️
ubuntu_gcc_mips	75.07% <ø> (ø)
ubuntu_gcc_mips64	75.08% <ø> (ø)
ubuntu_gcc_no_avx2	74.35% <ø> (ø)
ubuntu_gcc_no_ctz	74.81% <ø> (ø)
ubuntu_gcc_no_ctzll	74.80% <ø> (ø)
ubuntu_gcc_no_pclmulqdq	74.34% <ø> (ø)
ubuntu_gcc_no_sse2	74.61% <ø> (ø)
ubuntu_gcc_no_sse42	74.79% <ø> (+0.55%)	⬆️
ubuntu_gcc_o1	74.24% <ø> (+0.05%)	⬆️
ubuntu_gcc_osb	∅ <ø> (∅)
ubuntu_gcc_pigz	38.28% <ø> (-0.08%)	⬇️
ubuntu_gcc_pigz_aarch64	39.22% <ø> (+0.02%)	⬆️
ubuntu_gcc_ppc	74.08% <ø> (ø)
ubuntu_gcc_ppc64	74.51% <ø> (ø)
ubuntu_gcc_ppc64_power9	74.69% <ø> (ø)
ubuntu_gcc_ppc64le	74.52% <ø> (ø)
ubuntu_gcc_ppc64le_novsx	74.89% <ø> (ø)
ubuntu_gcc_ppc64le_power9	74.46% <ø> (ø)
ubuntu_gcc_ppc_no_power8	74.77% <ø> (ø)
ubuntu_gcc_s390x	74.96% <ø> (ø)
ubuntu_gcc_s390x_dfltcc	72.03% <ø> (ø)
ubuntu_gcc_s390x_dfltcc_compat	74.04% <ø> (ø)
ubuntu_gcc_s390x_no_crc32	74.75% <ø> (ø)
ubuntu_gcc_sparc64	74.89% <ø> (ø)
ubuntu_gcc_sprefix	73.40% <ø> (ø)
win64_gcc	74.14% <ø> (ø)
win64_gcc_compat_no_opt	74.88% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
functable.c	74.56% <ø> (ø)
test/benchmarks/benchmark_slidehash.cc	72.00% <ø> (ø)

... and 3 files with indirect coverage changes

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