[PATCH] D67766: [Float2Int] avoid crashing on unreachable code (PR38502)

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: bevinh, jmolloy, RKSimon.
Herald added subscribers: hiraditya, mcrosier.
Herald added a project: LLVM.

In the example from:
https://bugs.llvm.org/show_bug.cgi?id=38502
...we hit infinite looping/crashing because we have non-standard IR - an instruction operand is used before defined. 
This is allowed in unreachable blocks, so I'm proposing to avoid the problem by using DominatorTree to step around the landmines.


https://reviews.llvm.org/D67766

Files:
  llvm/include/llvm/Transforms/Scalar/Float2Int.h
  llvm/lib/Transforms/Scalar/Float2Int.cpp
  llvm/test/Transforms/Float2Int/basic.ll

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