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refactor(allocator): remove pointless debug_assert!s#21728

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Apr 24, 2026
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refactor(allocator): remove pointless debug_assert!s#21728
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@overlookmotel overlookmotel commented Apr 24, 2026 •
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usize::is_power_of_two already returns false for 0, so this is pointless duplication:

debug_assert!(n > 0);
debug_assert!(n.is_power_of_two());

Remove the first debug_assert! in these cases, to reduce code size and improve perf in debug builds.

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overlookmotel commented Apr 24, 2026 •
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codspeed-hq Bot commented Apr 24, 2026 •
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Merging this PR will not alter performance

✅ 48 untouched benchmarks
⏩ 3 skipped benchmarks1

Comparing om/04-24-refactor_allocator_remove_pointless_debug_assert_s (a717a55) with main (83b91f5)2

Open in CodSpeed

Footnotes

  1. 3 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. No successful run was found on main (a717a55) during the generation of this report, so 83b91f5 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

@overlookmotel overlookmotel self-assigned this Apr 24, 2026
@overlookmotel overlookmotel added C-cleanup Category - technical debt or refactoring. Solution not expected to change behavior A-allocator Area - Allocator labels Apr 24, 2026
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overlookmotel marked this pull request as ready for review April 24, 2026 19:39
Copilot AI review requested due to automatic review settings April 24, 2026 19:39
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Pull request overview

This PR refactors oxc_allocator arena utilities by removing redundant debug_assert!(divisor > 0) checks where debug_assert!(divisor.is_power_of_two()) already guarantees non-zero, reducing debug-build code size and minor overhead.

Changes:

  • Remove redundant debug_assert!(divisor > 0) from round_up_to, round_down_to, round_mut_ptr_down_to, and round_mut_ptr_up_to_unchecked.

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graphite-app Bot commented Apr 24, 2026 •
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@overlookmotel
refactor(allocator): remove pointless debug_assert!s (#21728)
a717a55 
`usize::is_power_of_two` already returns `false` for `0`, so this is pointless duplication:

```rust
debug_assert!(n > 0);
debug_assert!(n.is_power_of_two());
```

Remove the first `debug_assert!` in these cases, to reduce code size and improve perf in debug builds.
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graphite-app Bot force-pushed the om/04-24-refactor_allocator_remove_pointless_debug_assert_s branch from 4aac05b to a717a55 Compare April 24, 2026 21:15
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graphite-app Bot merged commit a717a55 into main Apr 24, 2026
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graphite-app Bot deleted the om/04-24-refactor_allocator_remove_pointless_debug_assert_s branch April 24, 2026 21:20
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