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perf: vectorize small u8 table take with NEON - #9571

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joseph-isaacs merged 6 commits into
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ji/small-u8-table-take-neon
Oct 5, 2026
Merged

joseph-isaacs merged 6 commits into
developfrom
ji/small-u8-table-take-neon

Merge develop and preserve allocator in small-table take dispatch

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CodSpeed / CodSpeed Performance Analysis succeeded Oct 5, 2026 in 0s

Performance Gate Passed

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ 1 benchmark measured no execution time

Nothing ran under measurement, usually because the compiler removed the code under test. This result is not comparable, so it counts as unchanged.

Preventing compiler optimizations

⚡ 1 improved benchmark
✅ 2094 untouched benchmarks
⏩ 518 skipped benchmarks1

Performance Changes

Mode Benchmark BASE HEAD Efficiency
⚡ WallTime dict_canonicalize_gt_u8_neon[1000000] 487.8 µs 50.9 µs ×9.6
⚠️ Simulation density_sweep_dense_runs[0.9] < 1 ns < 1 ns N/A

Tip

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Comparing ji/small-u8-table-take-neon (544409f) with develop (98e9ff4)

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Footnotes

  1. 518 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩