Nikita Popov 884bb97dca [MustExec][LICM] Handle latch being part of an inner cycle (PR57780) ...

The algorithm in allLoopPathsLeadToBlock() does not handle the case
where the loop latch is part of the predecessor set correctly: In
this case, we may take the backedge (escaping to a different loop
iteration) and not execute other latch successors. This can happen
if the latch is part of an inner cycle.

Fixes https://github.com/llvm/llvm-project/issues/57780.

Differential Revision: https://reviews.llvm.org/D134279

2022-10-11 09:30:13 +02:00

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