[PATCH] D118572: [NewGVN] Improve phi-of-ops fix to allow loads that loop invariant-ish

[Nuno Lopes via Phabricator via llvm-commits]

nlopes created this revision.
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My previous fix for the phi-of-ops was a bit of a big hammer.
This patch uses Memory SSA to detect when a load is guaranteed to not depend on a store that may happen inside the loop.

This patch fixes the regression in storeoverstore.ll, where the big hammer had disabled phi-of-ops for this test case.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118572

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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