[PATCH] D70040: Clang-trunk Generates Wrong Debug values with -O1

[kamlesh kumar via Phabricator via llvm-commits]

kamleshbhalui created this revision.
kamleshbhalui added a reviewer: vsk.
kamleshbhalui added a project: debug-info.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

Bit-Tracking Dead Code Elimination (bdce) do not mark dbg.value as undef after deleting instruction.
which shows invalid state of variable in debugger.
This patches fixes this by marking the dbg.value as undef which depends on dead instruction.

This fixes 
https://bugs.llvm.org/show_bug.cgi?id=41925


Repository:
  rL LLVM

https://reviews.llvm.org/D70040

Files:
  llvm/lib/Transforms/Scalar/BDCE.cpp
  llvm/test/Transforms/BDCE/pr41925.ll

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