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Port fix for dotnet/runtime#32059 to release/3.1 (JIT: make sure to set compLongUsed during struct promotion) #28024
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If we're promoting a long field, make sure `compLongUsed` gets set. Otherwise we may fail to properly decompose a long later on, leading to access violations in the jit. See dotnet/runtime#32059 for the original bug report, and dotnet/runtime#32702 for the fix in 5.0. ## Customer Impact Unexpected and hard to diagnose crash in the jit. No easy workaround. ## Regression? Yes, introduced during the development 3.0 cycle. 2.x behaves correctly. ## Testing Verified the user's test case now passes; no diffs seen in any existing framework or test code. ## Risk **Low**: fix is surgical and enables existing long operand handling in the jit in one case that can be overlooked. Only impacts x86 and arm codegen. Problematic IL patterns may not be reachable from C#.
jeffschwMSFT
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Approved, will seek approval for April release |
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Two tests failed -- one timed out, the other got some Linux TLS error; both are unrelated. |
leecow
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danmoseley
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If we're promoting a long field, make sure
compLongUsedgets set.Otherwise we may fail to properly decompose a long later on, leading
to access violations in the jit.
See dotnet/runtime#32059 for the original bug report, and
dotnet/runtime#32702 for the fix in 5.0.
Customer Impact
Unexpected and hard to diagnose crash in the jit. No easy workaround.
Regression?
Yes, introduced during the development 3.0 cycle. 2.x behaves correctly.
Testing
Verified the user's test case now passes; no diffs seen in any existing
framework or test code.
Risk
Low: fix is surgical and enables existing long operand handling in
the jit in one case that can be overlooked. Only impacts x86 and arm
codegen. Problematic IL patterns may not be reachable from C#.