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refactor(allocator): simplify is_pointer_aligned_to#21741

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Apr 25, 2026
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refactor(allocator): simplify is_pointer_aligned_to#21741
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om/04-25-refactor_allocator_simplify_is_pointer_aligned_to_

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@overlookmotel overlookmotel commented Apr 25, 2026 •
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Simplify the implementation of is_pointer_aligned_to. Results in the same assembly, but is clearer exactly what it does.

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overlookmotel commented Apr 25, 2026 •
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This was referenced Apr 25, 2026
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overlookmotel force-pushed the om/04-25-refactor_allocator_is_pointer_aligned_to_take_any_pointer branch from 0930b77 to faed9a1 Compare April 25, 2026 01:27
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overlookmotel force-pushed the om/04-25-refactor_allocator_simplify_is_pointer_aligned_to_ branch from 00d3c3e to 332198f Compare April 25, 2026 01:27
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Merging this PR will not alter performance

✅ 48 untouched benchmarks
⏩ 3 skipped benchmarks1

Comparing om/04-25-refactor_allocator_simplify_is_pointer_aligned_to_ (7fa4826) with main (1b97124)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 (2e2bb90) during the generation of this report, so 1b97124 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 25, 2026
@overlookmotel overlookmotel added A-allocator Area - Allocator C-cleanup Category - technical debt or refactoring. Solution not expected to change behavior labels Apr 25, 2026
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overlookmotel force-pushed the om/04-25-refactor_allocator_simplify_is_pointer_aligned_to_ branch from 332198f to 8a21fa6 Compare April 25, 2026 10:06
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overlookmotel marked this pull request as ready for review April 25, 2026 10:42
Copilot AI review requested due to automatic review settings April 25, 2026 10:42
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Pull request overview

Refactors is_pointer_aligned_to to a simpler bitmask-based alignment check and documents the alignment requirement/inlining rationale.

Changes:

  • Replace round_down_to-based comparison with (addr & (align - 1)) == 0
  • Add rustdoc explaining alignment requirements and rationale for #[inline(always)]

Comment thread crates/oxc_allocator/src/arena/utils.rs
@overlookmotel overlookmotel mentioned this pull request Apr 25, 2026
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@overlookmotel
refactor(allocator): simplify is_pointer_aligned_to (#21741)
7fa4826 
Simplify the implementation of `is_pointer_aligned_to`. Results in the same assembly, but is clearer exactly what it does.
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graphite-app Bot force-pushed the om/04-25-refactor_allocator_is_pointer_aligned_to_take_any_pointer branch from faed9a1 to 2e2bb90 Compare April 25, 2026 11:24
@graphite-app
graphite-app Bot force-pushed the om/04-25-refactor_allocator_simplify_is_pointer_aligned_to_ branch from 8a21fa6 to 7fa4826 Compare April 25, 2026 11:25
Base automatically changed from om/04-25-refactor_allocator_is_pointer_aligned_to_take_any_pointer to main April 25, 2026 11:30
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graphite-app Bot merged commit 7fa4826 into main Apr 25, 2026
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graphite-app Bot deleted the om/04-25-refactor_allocator_simplify_is_pointer_aligned_to_ branch April 25, 2026 11:31
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