JIT: Disallow tailcall stress in async methods#122869
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jakobbotsch merged 1 commit intodotnet:mainfrom Jan 6, 2026
Merged
JIT: Disallow tailcall stress in async methods#122869jakobbotsch merged 1 commit intodotnet:mainfrom
jakobbotsch merged 1 commit intodotnet:mainfrom
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Explicit tailcalls are not allowed out of async methods so it does not make sense to allow turning on tailcall stress. Turning it on also impacts IR created because we we may skip creating some `GT_RETURN` nodes, which is not expected by async transformations.
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Pull request overview
This PR fixes issue #122632 by disabling tailcall stress mode for async methods. Since explicit tailcalls are not allowed out of async methods (they need to restore contexts), it doesn't make sense to enable tailcall stress mode in these methods. Enabling tailcall stress in async methods can also cause issues with IR creation, as some GT_RETURN nodes may be skipped, which is not expected by async transformations.
Key Changes
- Added
!compIsAsync()check tocompTailCallStress()to prevent tailcall stress mode from being enabled in async methods - Added explanatory comment documenting why tailcalls are not allowed in async methods
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PTAL @dotnet/jit-contrib |
AndyAyersMS
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Jan 5, 2026
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This was referenced Jan 9, 2026
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Explicit tailcalls are not allowed out of async methods so it does not make sense to allow turning on tailcall stress. Turning it on also impacts IR created because we we may skip creating some
GT_RETURNnodes, which is not expected by async transformations.Fix #122632