[PATCH] D71771: [InstCombine] check alloc size in bitcast of geps fold (PR44321)

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: aqjune, efriedma, nlopes, lebedev.ri.
Herald added subscribers: hiraditya, mcrosier.
Herald added a project: LLVM.

We missed a constraint in D44833 <https://reviews.llvm.org/D44833> when folding a bitcast into a GEP with vector/array types.
If the alloc sizes specified by the datalayout don't match, this could miscompile as shown in:
https://bugs.llvm.org/show_bug.cgi?id=44321


https://reviews.llvm.org/D71771

Files:
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/Transforms/InstCombine/gep-vector.ll

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