[PATCH] D125511: [InstCombine] Merging constant-indexed GEP of GEP in both directions

[William Junda Huang via Phabricator via llvm-commits]

huangjd created this revision.
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Previously GEP of GEP with constant indices are only merged to the front (Second GEP is merged to the first one whenever possible). This patch expanded the optimization to also try merging to the direction under some constraints on GEP usage, if the first attempt failed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125511

Files:
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/Transforms/InstCombine/gep-merge-constant-indices.ll
  llvm/test/Transforms/InstCombine/opaque-ptr.ll

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