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Skip codegen of unreachable type dispatch arms - #10740

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rk/size-unreachable-dispatch-arms

Skip codegen of unreachable type dispatch arms

dd90465
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CodSpeed / CodSpeed Performance Analysis failed Oct 23, 2026 in 15m 19s

1 benchmark regressed

3 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 1 benchmark

This benchmark measured no execution time, so its result is not comparable and counts as unchanged. This usually happens when the compiler removes the code under test.

Prevent compiler optimizations

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⚠️ 20 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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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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⚡ 8 improved benchmarks
❌ 1 regressed benchmark
✅ 2399 untouched benchmarks
⏩ 12 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Walltime threshold_avx2[80] 2.6 µs 2.9 µs -10.54%
⚡ Walltime filter_neon[8] 1,997 ns 924 ns ×2.2
⚡ Walltime threshold_neon[8] 2.6 µs 1.3 µs +96.65%
⚡ Walltime filter_neon[64] 2.5 µs 1.8 µs +39.35%
⚡ Walltime threshold_neon[64] 3.5 µs 2.6 µs +36.62%
⚡ Walltime threshold_neon[80] 4.6 µs 3.4 µs +34.78%
⚡ Walltime filter_neon[80] 3.4 µs 2.7 µs +26.32%
⚡ Walltime decode_chunked_neon[i64, 524288] 15.7 µs 13.4 µs +17.34%
⚡ CPU Simulation or_true_constant 20.8 µs 18.8 µs +10.53%

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-unreachable-dispatch-arms (dd90465) with develop (c750fbd)

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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. ↩