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[codex] Experiment: Fearless SIMD boolean packing - #10320

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[codex] Experiment: Fearless SIMD boolean packing#10320
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ji/fearless-simd-bool-packing

Experiment with Fearless SIMD boolean packing

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

Performance Regression: -30.93%

⚠️ 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.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 9 improved benchmarks
❌ 17 regressed benchmarks
✅ 2075 untouched benchmarks
⏩ 518 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ WallTime deferred_bool_avx2[16384, (ConstantLhs, PartialAccepted)] 33.5 µs 231.9 µs -85.54%
❌ WallTime deferred_bool_avx512[16384, (ConstantLhs, PartialAccepted)] 38.2 µs 232.2 µs -83.57%
❌ WallTime deferred_bool_avx2[16384, (Columns, PartialAccepted)] 42.6 µs 231.5 µs -81.59%
❌ WallTime deferred_bool_avx512[16384, (Columns, PartialAccepted)] 43.6 µs 231.9 µs -81.19%
❌ WallTime deferred_bool_neon[16384, (ConstantLhs, PartialAccepted)] 54.8 µs 181.6 µs -69.84%
❌ WallTime deferred_bool_neon[16384, (Columns, PartialAccepted)] 68.8 µs 174.3 µs -60.53%
❌ WallTime deferred_bool_avx512[16384, (ConstantLhs, NullOnlyFailure)] 285.7 µs 498.5 µs -42.69%
❌ WallTime deferred_bool_avx2[16384, (Columns, NullOnlyFailure)] 278.4 µs 467.9 µs -40.49%
❌ WallTime deferred_bool_avx2[16384, (ConstantLhs, NullOnlyFailure)] 297.4 µs 498.9 µs -40.39%
❌ WallTime deferred_bool_avx512[16384, (Columns, NullOnlyFailure)] 302 µs 467.6 µs -35.42%
❌ Simulation from_bool_slice[1024] 3.4 µs 5.2 µs -34.34%
❌ WallTime words_gather_dispatch_neon[65536] 2.1 µs 2.8 µs -27.16%
❌ WallTime deferred_bool_neon[16384, (ConstantLhs, NullOnlyFailure)] 375.5 µs 496.1 µs -24.3%
❌ WallTime words_gather_dispatch_neon[1048576] 29.8 µs 38.5 µs -22.52%
❌ WallTime deferred_bool_neon[16384, (Columns, NullOnlyFailure)] 381.1 µs 478.3 µs -20.32%
❌ Simulation compare[1] 114.3 µs 135.1 µs -15.4%
❌ WallTime words_gather_dispatch_avx512[65536] 967 ns 1,075 ns -10.05%
⚡ WallTime infallible_bool_avx2[i64, PerRowPerRow] 10.4 µs 5.6 µs +85.76%
⚡ WallTime infallible_bool_constant_avx2[PerRowConstant] 10.3 µs 5.6 µs +85.28%
⚡ WallTime deferred_bool_constant_avx2[PerRowConstant] 10.8 µs 6 µs +80.25%
... ... ... ... ... ...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

Tip

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Comparing ji/fearless-simd-bool-packing (428719b) with develop (c6e51ba)

Open in CodSpeed

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. ↩

View more details on CodSpeed