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D71264 started using a context instruction in a computeKnownBits() call. However, if aliasing between two GEPs is checked, then the choice of context instruction will be different for alias(GEP1, GEP2) and alias(GEP2, GEP1), which is not supposed to happen. Resolve this by remembering which GEP a certain VarIndex belongs to, and use that as the context instruction. This makes the choice of context instruction predictable and symmetric. It should be noted that this choice of context instruction is non-optimal (just like the previous choice): The AA query result is only valid at points that are reachable from *both* instructions. Using either one of them is conservatively correct, but a larger context may also be valid to use. Differential Revision: https://reviews.llvm.org/D93183 |
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