Bump simdutf to 9.1.2

[JakubOnderka]

Summary by CodeRabbit

• Bug Fixes

  • Invalid Base64 padding is now consistently reported as an error.
  • Improved safety and correctness for Base64 decoding across supported platforms.
  • Enhanced UTF-8 validation for large inputs and edge cases.
  • Improved whitespace scanning reliability.

• Performance

  • Optimized Base64 decoding and UTF-8 validation for faster processing of large inputs.

• Maintenance

  • Updated the library version to 9.1.2.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: f96a49b8-181e-4282-852c-4d75c180dfa6

📥 Commits

Reviewing files that changed from the base of the PR and between 3087234 and e03c037.

📒 Files selected for processing (2)

• src/simdutf.cpp
• src/simdutf.h

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The generated SIMD sources update Base64 validation and safe stores, UTF-8 validation, whitespace scan bounds, platform detection, and version metadata across AVX-512, AVX2, LASX, and shared headers.

Changes

SIMD backend updates

Layer / File(s)	Summary
AVX-512 Base64 decoding src/simdutf.cpp	AVX-512 Base64 translation now uses shared lookup tables, bulk decoding paths, separated packing and stores, and bounded safe stores. Invalid-padding results are marked fatal.
UTF validation and whitespace scans src/simdutf.cpp	Large UTF-8 inputs use aligned reads, batched error checks, safe-prefix tracking, and scalar rewind handling. AVX-512 and AVX2 whitespace scans use remaining-length loop bounds.
Other Base64 backend handling src/simdutf.cpp	Big-endian paths use zero-vector padding lanes. LASX safe decoding uses aligned temporary storage and copies valid output bytes. Additional invalid-padding results are marked fatal.
Generated header and platform metadata src/simdutf.cpp, src/simdutf.h	Generated timestamps were updated. The library version changed from 9.1.0 to 9.1.2. PPC64 detection now also requires __POWER8_VECTOR__.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to e03c0

The dependency update has no identified merge-blocking issue and is ready for normal validation and merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 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%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the primary change: updating simdutf to version 9.1.2. It is concise and directly matches the pull request objective.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 too large.)

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-simdutf-9.1.2

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