[PATCH] D101103: [InstSimplify] Treat invariant group insts as bitcasts for load operands

[Chang Lin via Phabricator via llvm-commits]

clin1 added a comment.

Hi @aeubanks, we turned up a corner case where jump threading is creating a self-referential GEP:

  %tmp27 = getelementptr inbounds i8, i8* %tmp27, i64 1

Surprisingly, this is allowed in unreachable code:
https://lists.llvm.org/pipermail/llvm-dev/2012-October/054719.html

The self reference causes InstSimplify to hang when it's called from JT.
Test case "reduced.ll" attached. Would you mind checking it out? Thank you!F17315031: reduced.ll <https://reviews.llvm.org/F17315031>


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https://reviews.llvm.org/D101103