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Refine BitPackingScheme to per-block bit widths when fastlanes.bitpacked.v2 is allowed - #10245

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Refine BitPackingScheme to per-block bit widths when fastlanes.bitpacked.v2 is allowed#10245
mhk197 wants to merge 4 commits into
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mk/bitpacked-v2-scheme

use renamed bitpack_blocked_to_best_bit_widths in BitPackingScheme

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CodSpeed / CodSpeed Performance Analysis failed Oct 9, 2026 in 0s

Performance Regression: -24.89%

⚠️ 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

❌ 2 regressed benchmarks
✅ 2187 untouched benchmarks
⏩ 409 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Simulation decode_primitives[i64, (1000, 32)] 24.1 µs 38 µs -36.41%
❌ WallTime bitpack_blocked_compress_avx2 6.8 µs 7.6 µs -11.28%

Tip

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

Comparing mk/bitpacked-v2-scheme (f638117) with mk/bitpacked-v2-wire (fc9ce15)

Open in CodSpeed

Footnotes

  1. 409 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