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JIT: Remove overzealous async assert #115883

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Merged
merged 1 commit into from
May 23, 2025
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The store can come from a STORE_LCL_FLD, so in reality there is no relation between the type of the resultLcl and the call type. The code below handles STORE_LCL_FLD correctly, so just remove the assert.

Fix #115839

The store can come from a `STORE_LCL_FLD`, so in reality there is no
relation between the type of the resultLcl and the call type. The code
below handles `STORE_LCL_FLD` correctly, so just remove the assert.
@Copilot Copilot AI review requested due to automatic review settings May 22, 2025 09:21
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Pull Request Overview

This PR removes an overzealous assert in the async transformation logic that mistakenly assumes the structure type of the result local variable matches the call’s return type, even when the store originates from a STORE_LCL_FLD.

  • Removed a redundant assert in async.cpp
  • Clarified handling of STORE_LCL_FLD scenarios to prevent incorrect assumptions
Comments suppressed due to low confidence (1)

src/coreclr/jit/async.cpp:1540

  • Consider adding a brief comment here to explain why this assertion was removed, particularly highlighting that STORE_LCL_FLD may yield a different relation between result local type and call return type.
assert(varTypeIsStruct(resultLcl) == varTypeIsStruct(call->gtReturnType));

@github-actions github-actions bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 22, 2025
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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PTAL @dotnet/jit-contrib

@jakobbotsch jakobbotsch requested a review from a team May 22, 2025 15:21
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/ba-g Timeout

@jakobbotsch jakobbotsch merged commit d4c23c6 into dotnet:main May 23, 2025
107 of 109 checks passed
@jakobbotsch jakobbotsch deleted the fix-115839 branch May 23, 2025 07:32
SimaTian pushed a commit that referenced this pull request May 27, 2025
The store can come from a `STORE_LCL_FLD`, so in reality there is no
relation between the type of the resultLcl and the call type. The code
below handles `STORE_LCL_FLD` correctly, so just remove the assert.
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JIT: Assertion failed 'varTypeIsStruct(resultLcl) == varTypeIsStruct(call->gtReturnType)' during 'Transform async'
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