forked from OSchip/llvm-project
0b168a49bf
Previously, GEPOp relies on `findKnownStructIndices` to check if a GEP index should be static. The truth is, `findKnownStructIndices` can only tell you a GEP index _might_ be indexing into a struct (which should use a static GEP index). But GEPOp::build and GEPOp::verify are falsely taking this information as a certain answer, which creates many false alarms like the one depicted in `test/Target/LLVMIR/Import/dynamic-gep-index.ll`. The solution presented here adopts a new verification scheme: When we're recursively checking the child element types of a struct type, instead of checking every child types, we only check the one dictated by the (static) GEP index value. We also combine "refinement" logics -- refine/promote struct index mlir::Value into constants -- into the very verification process since they have lots of logics in common. The resulting code is more concise and less brittle. We also hide GEPOp::findKnownStructIndices since most of the aforementioned logics are already encapsulated within GEPOp::build and GEPOp::verify, we found little reason for findKnownStructIndices (or the new findStructIndices) to be public. Differential Revision: https://reviews.llvm.org/D124935 |
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