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Build precision 19 decimal scalars at i128 - #10903

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Build precision 19 decimal scalars at i128

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CodSpeed / CodSpeed Performance Analysis failed Oct 27, 2026 in 4m 55s

Performance Regression: -13.54%

3 warnings

⚠️ 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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⚠️ 3 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

⚡ 1 improved benchmark
❌ 3 regressed benchmarks
✅ 2200 untouched benchmarks
⏩ 370 skipped benchmarks1
🗄️ 30 archived benchmarks run2

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Walltime threshold_neon[64] 2.6 µs 3.8 µs -31.52%
❌ Walltime threshold_neon[80] 3.3 µs 4.4 µs -24.01%
❌ Walltime filter_neon[80] 2.4 µs 2.8 µs -12.32%
⚡ CPU Simulation test_repeated_scan_scalar_at[int_str] 412.1 µs 336.5 µs +22.46%

Tip

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


Comparing ct/decimal-scalar-factory-width (41073b9) with ct/decimal-width-owner (9836fef)

Open in CodSpeed

Footnotes

  1. 370 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. ↩

  2. 30 benchmarks were run, but are now archived. If they were deleted in another branch, consider rebasing to remove them from the report. Instead if they were added back, click here to restore them. ↩