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SimplifyConstantIfBranchExecution leaves unreachable code - #546
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timtebeek merged 3 commits intoMay 9, 2025
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… return statements. Modified condition on `RemoveUnneededBlock` to allow for block flattening even if it contains variable declarations as long as it also contains a return (which when combined with `RemoveUnreachableCodeVisitor` should be able to prevent issues that might crop up due to descoping the first block.
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Code changes look good already; let me know if you saw any results on a large run that gave you pause before a merge, or if we can already merge as is.
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Certain cases where there is an object assignment in an unneeded
ifblock in the initial code can causeSimplifyConstantIfBranchExecutionto leave scoping braces and unreachable lines in the code. The underlying cause is due toRemoveUnneededBlockdeciding to not remove scoping braces if a block contains variable declarations, however, if the block also contains a return, thenSimplifyConstantIfBranchExecutionwhich also usesRemoveUnreachableCodeVisitorshould be able to be unwrapped because there should be no conflicts after unreachable code is removed.What's changed?
SimplifyConstantIfBranchExecutiontests and test example provided forRemoveUnneededBlockspecifically covering change in logic to allow unwrapping if return statement is nested.Checklist