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Preserve the NEON Boolean packing reduction - #10671

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ct/row-fn-cleanup/neon-packing
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ct/row-fn-cleanup/neon-packing

Preserve the NEON Boolean packing reduction

bf27cc1
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CodSpeed / CodSpeed Performance Analysis failed Oct 21, 2026

4 benchmarks regressed

4 warnings, 1 note

⚠️ Walltime results may be unreliable

Some benchmarks used the Walltime instrument outside CodSpeed Macro Runners, which can make the results inconsistent.

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⚠️ Unable to measure the execution of 2 benchmarks

These benchmarks measured no execution time, so their results are not comparable and count as unchanged. This usually happens when the compiler removes the code under test.

Prevent compiler optimizations

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⚠️ 16 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

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⚠️ Base and head ran on different runner types

Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.

Learn more about Macro Runners

Open the report in CodSpeed to investigate

ℹ️ 40 benchmarks have no flamegraph

The flamegraph wasn't generated: the symbols of the profiling trace could not be resolved, because no information about the language frames was collected.

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⚡ 3 improved benchmarks
❌ 4 regressed benchmarks
✅ 2401 untouched benchmarks
⏩ 12 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ CPU Simulation density_sweep_dense_runs[0.001] 43 µs 60.5 µs -28.86%
❌ Walltime take_u16_nullable_from_65536_avx512[1048576] 389.9 µs 449.1 µs -13.17%
❌ Walltime deferred_bool_constant_neon[PerRowConstant] 6 µs 6.9 µs -12.81%
❌ Walltime threshold_neon[80] 3.6 µs 4.1 µs -11.85%
⚡ Walltime filter_neon[64] 2.9 µs 1.7 µs +68.89%
⚡ Walltime filter_neon[8] 1,343 ns 910 ns +47.58%
⚡ Walltime filter_neon[80] 3.1 µs 2.6 µs +19.86%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.


Comparing ct/row-fn-cleanup/neon-packing (bf27cc1) with develop (8374e7a)

Open in CodSpeed

Footnotes

  1. 12 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. ↩