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Vectorize small-offset overlapping match copies with NEON `tbl` / SSSE3 `pshufb` - #4718

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ClickHouse:vectorize-overlap-copy

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Vectorize small-offset overlapping match copies with NEON `tbl` / SSSE3 `pshufb`#4718
thevar1able wants to merge 4 commits into
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ClickHouse:vectorize-overlap-copy

Commits on Jul 30, 2026
- Vectorize small-offset overlapping copies on AArch64 with NEON tbl
  
  authored and
  thevar1able
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  c963f40
- Vectorize small-offset overlapping copies on x86_64 with SSSE3 pshufb
  
  thevar1able
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  claude
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  cae1d79
- Restrict the vectorized NEON overlap-copy path to AArch64
  
  thevar1able
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  claude
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  2b939fc
- Move the vectorized overlap copy into a standalone noinline function
  
  thevar1able
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  claude
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  f9e5fd3