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Add bit-exact x86 SIMD fast paths for math, strings, images, audio and culling - #1521

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mcdubhghlas:perf/simd

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Add bit-exact x86 SIMD fast paths for math, strings, images, audio and culling#1521
mcdubhghlas wants to merge 8 commits into
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mcdubhghlas:perf/simd

Commits on Oct 16, 2026
- Add bit-exact x86 SIMD fast paths for math, strings, images, audio and culling
  
  mcdubhghlas
  and
  claude
  committed
  c1fedef
- code rabbit fixes; bigger increase for string hashes
  mcdubhghlas
  committed
  072d50a
- correct simd tests.
  mcdubhghlas
  committed
  96a5094
Commits on Oct 17, 2026
- C4996 error
  mcdubhghlas
  committed
  dc4bb3d
- Fix -O3 SIGSEGV in SIMD string test by removing embedded-NUL block
  mcdubhghlas
  committed
  60dfd87
Commits on Oct 18, 2026
- Fix SIMD test failures on CI: empty-string -O3 crash and MSVC round() UB
  mcdubhghlas
  committed
  a280c47
Commits on Oct 19, 2026
- well-defined domain for round()/color packing, bound UTF-8 offset
  mcdubhghlas
  committed
  0be6dc8
- Normalize round4 negative zero with a bitwise mask so MSVC can't drop it
  mcdubhghlas
  committed
  3337281