[PATCH] D60556: [DebugInfo at O2] Fix pr41175 Dead Store Elimination missing debug loc

[Orlando Cazalet-Hyams via Phabricator via llvm-commits]

Orlando created this revision.
Orlando added reviewers: aprantl, vsk, junbuml.
Orlando added a project: debug-info.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

Bug: https://bugs.llvm.org/show_bug.cgi?id=41175

In the bug test case the DSE pass is shortening the range of memory that a memset is working on. A getelementptr is generated so that the new starting address can be passed to memset. This instruction was not given a DebugLoc.

To fix the bug I copy the DebugLoc from the memset instruction.
I've added a test that checks this.


Repository:
  rL LLVM

https://reviews.llvm.org/D60556

Files:
  llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
  llvm/test/Transforms/DeadStoreElimination/memset-missing-debugloc.ll

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