update align to avoid signed cast and clang warning

[pknowles]

This does change the compiled result for all of gcc, clang, msvc.

Summary by CodeRabbit

• Refactor
  • Optimized internal memory alignment calculation while maintaining full compatibility with the existing public interface.

[coderabbitai]

Walkthrough

The allocate function's alignment calculation in the memory allocator is modified. The previous bit-twiddling approach is replaced with an explicit power-of-two alignment formula (m_next + align - 1) & ~(align - 1), maintaining functional equivalence while clarifying the alignment assumption.

Changes

Cohort / File(s)	Summary
Alignment Calculation Refactor include/decodeless/allocator.hpp	Modified alignment calculation logic in allocate function from cast-based bit-twiddling to explicit power-of-two formula. Two lines changed with identical public interface and control flow.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 Bits aligned in perfect rows,
Where memory flows and math still grows,
Power-of-two, a clearer way,
To allocate with grace today! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating alignment calculation logic to avoid signed cast issues and Clang warnings.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pknowles/clang_cast

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No actionable comments were generated in the recent review. 🎉

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