[PATCH] D156055: [NewGVN][PHIOFOPS] Relax conditions when checking safety of memory accesses

[Manuel Brito via Phabricator via llvm-commits]

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Currently, we consider any instruction that might read from memory to be unsafe for phi-of-ops. 
This patch refines that by walking the memDef/memPhis until we either hit a block that strictly dominates the phi block (safe) or we hit a clobbering memPhi in the same block has the phi block(unsafe). This is analogous to how "regular " SSA values are handled.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156055

Files:
  llvm/lib/Transforms/Scalar/NewGVN.cpp
  llvm/test/Transforms/NewGVN/phi-of-ops-loads.ll
  llvm/test/Transforms/NewGVN/storeoverstore.ll

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