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It is invalid to hoist stores or loads if they are not executed on all paths from the hoisting point to the exit of the function. In the testcase, there are paths in the loop that do not execute the stores or the loads, and so hoisting them within the loop is unsafe. The problem is that the current implementation of hoistingFromAllPaths is incomplete: it walks all blocks dominated by the hoisting point, and does not return false when the loop contains a path on which the hoisted ld/st is not executed. Differential Revision: https://reviews.llvm.org/D23843 llvm-svn: 279732
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