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Share FastLanes compare kernels between operators and signedness - #10739

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rk/size-fastlanes-compare-negate
Oct 26, 2026
Merged

connortsui20 merged 2 commits into
developfrom
rk/size-fastlanes-compare-negate

Compare signed bit-packed values with unsigned kernels

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CodSpeed / CodSpeed Performance Analysis failed Oct 26, 2026 in 0s

2 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.

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⚠️ 17 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.

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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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⚡ 24 improved benchmarks
❌ 2 regressed benchmarks
✅ 2413 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 bench_compare_sliced_dict_primitive[(3333, 10000)] 32.9 µs 71 µs -53.63%
❌ CPU Simulation filter_powerlaw_by_random[250000] 131.3 µs 174.3 µs -24.66%
⚡ CPU Simulation chunked_dict_primitive_canonical_into[f64, (1000, 1000, 10)] 203.3 µs 149.4 µs +36.07%
⚡ CPU Simulation compare[33] 503.3 µs 446.1 µs +12.82%
⚡ CPU Simulation compare[34] 504.3 µs 447.8 µs +12.62%
⚡ CPU Simulation compare[36] 512.5 µs 456.3 µs +12.31%
⚡ CPU Simulation compare[35] 518.3 µs 461.9 µs +12.2%
⚡ CPU Simulation compare[31] 482 µs 429.9 µs +12.1%
⚡ CPU Simulation compare[30] 466 µs 416.2 µs +11.98%
⚡ CPU Simulation compare[29] 462.1 µs 413.1 µs +11.86%
⚡ CPU Simulation compare[28] 436.7 µs 390.7 µs +11.77%
⚡ CPU Simulation compare[38] 535.6 µs 479.6 µs +11.67%
⚡ CPU Simulation compare[37] 532.7 µs 478.2 µs +11.4%
⚡ CPU Simulation compare[39] 550.2 µs 494.6 µs +11.24%
⚡ CPU Simulation compare[27] 440.5 µs 396.9 µs +10.99%
⚡ CPU Simulation decompress[u16, (4000, 256)] 62.5 µs 56.3 µs +10.98%
⚡ CPU Simulation compare[26] 425.6 µs 383.8 µs +10.89%
⚡ CPU Simulation compare[42] 567.1 µs 511.7 µs +10.84%
⚡ CPU Simulation compare[25] 421.8 µs 380.7 µs +10.78%
⚡ CPU Simulation compare[44] 575.4 µs 520.3 µs +10.59%
... ... ... ... ... ...

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

Tip

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


Comparing rk/size-fastlanes-compare-negate (47f9018) with develop (76d8371)

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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. ↩