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Some optimisations in DAGCombiner cause miscompilations for targets that use TargetLowering::UndefinedBooleanContent, because they assume that the results of a SELECT_CC node are boolean values, and can be safely ANDed, ORed and XORed. These optimisations are only valid for targets that use ZeroOrOneBooleanContent or ZeroOrNegativeOneBooleanContent. This is a follow-up to D6210/r221693. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222123 91177308-0d34-0410-b5e6-96231b3b80d8
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