[PATCH] D124527: [GVN] Encode GEPs in offset representation

[Nikita Popov via Phabricator via llvm-commits]

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When using opaque pointers, convert GEPs into offset representation of the form `P + V1 * Scale1 + V2 * Scale2 + ... + ConstantOffset`. This allows us to recognize equivalent address calculations even if the GEPs don't use the same source element type.

This fixes an opaque pointer codegen regression seen in rustc.


https://reviews.llvm.org/D124527

Files:
  llvm/include/llvm/Transforms/Scalar/GVN.h
  llvm/lib/Transforms/Scalar/GVN.cpp
  llvm/test/Transforms/GVN/opaque-ptr.ll

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