[PATCH] D37338: [LoopUnroll][DebugInfo] Don't add metadata to unrolled remainder loop

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.

Debug information can be, and was, corrupted when the runtime remainder loop was fully unrolled. This is because the a !null node can be created instead of a unique one describing the loop. In this case, the original node gets incorrectly updated with the NewLoopID metadata.

      

In the case when the remainder loop is going to be quickly fully unrolled, there isn't the need to add loop metadata for it anyway.


https://reviews.llvm.org/D37338

Files:
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  test/DebugInfo/unrolled-loop-remainder.ll
  test/Transforms/LoopUnroll/runtime-unroll-remainder.ll

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