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[BugFix] Fix unsafe visit else case under WarpSpecializationScope#1702

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LeiWang1999 merged 1 commit intotile-ai:mainfrom
SiriusNEO:chaofan/1698_0120
Jan 20, 2026
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[BugFix] Fix unsafe visit else case under WarpSpecializationScope#1702
LeiWang1999 merged 1 commit intotile-ai:mainfrom
SiriusNEO:chaofan/1698_0120

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@SiriusNEO SiriusNEO commented Jan 20, 2026 •
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Fix #1698

Summary by CodeRabbit

  • Bug Fixes
    • Enhanced safety by adding proper validation checks in edge case handling to prevent potential runtime errors.

✏️ Tip: You can customize this high-level summary in your review settings.

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coderabbitai bot commented Jan 20, 2026 •
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📝 Walkthrough

Walkthrough

A defensive guard is added to the kWarpSpecializationScope handling in the shared memory allocation merge transform, checking whether an optional else_case exists before attempting to access it, preventing unsafe optional value dereference.

Changes

Cohort / File(s) Summary
Warp Specialization Else Case Guard
src/transform/merge_shared_memory_allocations.cc		 Added conditional check for else_case existence before visiting it in kWarpSpecializationScope handling; prevents unsafe access to optional value

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A rabbit found an optional gone astray,
Without a guard, it crashed the day,
Now with a check before we poke,
The code runs strong—no broken spoke! 🌟

🚥 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%. 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 and specifically describes the bug fix: guarding unsafe optional access to else_case in WarpSpecializationScope handling, which directly addresses the RuntimeError reported in the linked issue.
Linked Issues check ✅ Passed The code change directly fixes the root cause of issue #1698 by adding a safety guard (checking if else_case is defined) before accessing it, preventing the 'Back optional access' RuntimeError during the MergeSharedMemoryAllocations pass.
Out of Scope Changes check ✅ Passed The change is narrowly scoped to fix the specific unsafe optional access bug in WarpSpecializationScope handling, with no extraneous modifications.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

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@SiriusNEO SiriusNEO mentioned this pull request Jan 20, 2026
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2 tasks
@LeiWang1999 LeiWang1999 merged commit bf675e2 into tile-ai:main Jan 20, 2026
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@kurisu6912 kurisu6912 mentioned this pull request Feb 11, 2026
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@LeiWang1999 LeiWang1999 LeiWang1999 approved these changes

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[Question] Why did I get this RuntimeError

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