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[InstSimplify] Fix incorrect poison propagation when folding phi (#96631 )

We can only replace phi(X, undef) with X, if X is known not to be
poison. Otherwise, the result may be more poisonous on the undef branch.

Fixes https://github.com/llvm/llvm-project/issues/68683.

2024-11-07 14:09:45 +01:00

2002-03-28-UninitializedVal.ll

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2002-05-01-ShouldNotPromoteThisAlloca.ll

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2003-04-10-DFNotFound.ll

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2003-04-18-DeadBlockProblem.ll

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2003-04-24-MultipleIdenticalSuccessors.ll

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2003-06-26-IterativePromote.ll

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2003-10-05-DeadPHIInsertion.ll

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2005-06-30-ReadBeforeWrite.ll

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2005-11-28-Crash.ll

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2007-08-27-VolatileLoadsStores.ll

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alloca_addrspace.ll

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atomic.ll

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ConvertDebugInfo2.ll

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ConvertDebugInfo.ll

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crash.ll

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dbg_declare_to_value_conversions.ll

[debuginfo] replace usage of undef with poison as placeholder [NFC]

2024-08-07 09:33:55 +01:00

dbg-inline-scope-for-phi.ll

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debug-alloca-phi-2.ll

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debug-alloca-phi.ll

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debug-alloca-vla-1.ll

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debug-alloca-vla-2.ll

[debuginfo] replace usage of undef with poison as placeholder [NFC]

2024-08-07 09:33:55 +01:00

ignore-droppable.ll

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ignore-lifetime.ll

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opaque-ptr.ll

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optnone.ll

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pr24179.ll

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pr37632-unreachable-list-of-stores.ll

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preserve-nonnull-load-metadata.ll

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PromoteMemToRegister.ll

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single-store.ll

[InstSimplify] Fix incorrect poison propagation when folding phi (#96631 )

2024-11-07 14:09:45 +01:00

undef-order.ll

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UndefValuesMerge.ll

[InstSimplify] Fix incorrect poison propagation when folding phi (#96631 )

2024-11-07 14:09:45 +01:00