[PATCH] D125845: [InstCombine] Canonicalize GEP of GEP and merging GEP with constant indices

[William Junda Huang via Phabricator via llvm-commits]

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Canonicalize GEP of GEP by swapping GEP with some suffix constant indices to the back (and GEP with all constant indices to the back of that), this allows more constant index GEP merging to happen. Exceptions are: If swapping violates use-def relations, or anti-optimizes LICM

For constant indexed GEP of GEP, if they cannot be merged directly, they will be casted to i8* and merged.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125845

Files:
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/Transforms/InstCombine/gep-canonicalize-constant-indices.ll
  llvm/test/Transforms/InstCombine/gep-merge-constant-indices.ll
  llvm/test/Transforms/InstCombine/opaque-ptr.ll
  llvm/test/Transforms/InstCombine/shift.ll
  llvm/test/Transforms/LoopVectorize/AArch64/vector-reverse-mask4.ll
  llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll

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