[Mem2Reg] Replaced loop with getSingleSuccessor. #40020
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Thanks to the lack of critical edges in SIL, if a block B dominated by P has a successor S which is not dominated by P, then B must have only a single successor. Used this fact to replace a loop over successors to a call to getSinglePredecessor. Also added an assertion that, in the notation above, B is dominated by P.
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@swift-ci please test |
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@swift-ci please test and merge |
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Thanks to the lack of critical edges in SIL, if a block B dominated by P has a successor S which is not dominated by P, then B must have only a single successor. Used this fact to replace a loop over successors to a call to getSinglePredecessor.
Also added an assertion that, in the notation above, B is dominated by P.