[release/10.0] JIT: Handle more unsupported argument conversion cases#119388
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jeffschwMSFT merged 1 commit intodotnet:release/10.0from Sep 11, 2025
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[release/10.0] JIT: Handle more unsupported argument conversion cases#119388jeffschwMSFT merged 1 commit intodotnet:release/10.0from
jeffschwMSFT merged 1 commit intodotnet:release/10.0from
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On 32-bit platforms we can end up with long operands to a function taking a parameter in a double. We would try to create bitcasts for this cast. Generalize a condition to properly detect this unsupported case.
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Pull Request Overview
This backport PR fixes a JIT compiler issue on ARM32 where bad codegen could occur when an 8-byte struct is classified as being passed in a double register but the operand is in integer registers. The fix prevents invalid IR generation by adding checks for unsupported argument conversion cases.
Key changes:
- Removes an assertion that was too restrictive for certain struct passing scenarios
- Adds validation to prevent unsupported int-to-float register conversions that require insertions
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jeffschwMSFT
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Sep 5, 2025
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approved. please get a code review. we can merge when ready
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AndyAyersMS
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Sep 9, 2025
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/ba-g Android timeout failure |
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Backport of #119328 to release/10.0
Customer Impact
Potential bad codegen when an 8 byte struct is classified as being passed in a double register on arm32. If the JIT ends up with an operand that is in integer registers, then it produces an invalid IR that it is not prepared to handle.
Regression
Testing
Existing stress testing revealed the issue in #119062, and the fix was verified on that test.
Risk
Low