[PATCH] D110247: [InstCombine] Fold ptrtoint(gep null) with a variable index

[Alexander Richardson via Phabricator via llvm-commits]

arichardson created this revision.
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This is a follow-up to the previous changes that fold ptrtoint(gep null).
If there is only one variable index (and N constant ones), we can fold
this to a mul+add+zext/trunc. Avoiding the pointer operation should be
beneficial for follow-up optimizations.

Depends on D110246 <https://reviews.llvm.org/D110246>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110247

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
  llvm/test/Transforms/InstCombine/ptrtoint-nullgep.ll

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