[PATCH] D126030: [InstCombine] Canonicalize GEP of GEP by swapping constant-indexed GEP to the back

[William Junda Huang via Phabricator via llvm-commits]

huangjd created this revision.
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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

Originally D125845 <https://reviews.llvm.org/D125845>, clean up revision mess


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126030

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/shift.ll
  llvm/test/Transforms/LoopVectorize/AArch64/vector-reverse-mask4.ll
  llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll

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