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| author | Jean Boussier <jean.boussier@gmail.com> | 2025-04-28 15:23:48 +0200 |
|---|---|---|
| committer | Jean Boussier <jean.boussier@gmail.com> | 2025-04-30 08:12:41 +0200 |
| commit | b5beed45a22265f9537d23717637f6067458c834 (patch) | |
| tree | d14e9522710958b153f4f2e0c47108c051f1c2fd /include/ruby/internal/error.h | |
| parent | b7d1e33f26be7610df27d5c4538f443e81f986fa (diff) | |
[ruby/json] SIMD: Match control char and double quote in one pass
`c < 32 || c == 34` is equivalent to `c ^ 2 < 33`.
Found in: https://lemire.me/blog/2025/04/13/detect-control-characters-quotes-and-backslashes-efficiently-using-swar/
The gain seem mostly present on micro-benchmark, and even there aren't
very consistent, but it's never slower.
```
== Encoding long string (124001 bytes)
ruby 3.4.2 (2025-02-15 revision https://github.com/ruby/json/commit/d2930f8e7a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
after 5.295k i/100ms
Calculating -------------------------------------
after 55.796k (± 3.4%) i/s (17.92 μs/i) - 280.635k in 5.035690s
Comparison:
before: 49840.7 i/s
after: 55795.8 i/s - 1.12x faster
```
https://github.com/ruby/json/commit/034c5debd8
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