[PATCH] D60831: [DebugInfo at O2][LoopVectorize] pr39024: Vectorized code linenos step through loop even after completion

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

Orlando added a comment.

In D60831#1546469 <https://reviews.llvm.org/D60831#1546469>, @aprantl wrote:

> There is one thing I don't understand:
> It looks like !680 is only used in the !llvm.loop !679 metadata. How can that trigger a !dbg attachment points at wrong subprogram for function verifier failure?


Empty loop preheaders are sometimes removed and later regenerated. This patch
uses loop metadata to identify the start of the loop when regenerating the
preheader. The DILocation of the `start` node (node index 1) of the loop
metadata is given to the new preheader's branch.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D60831/new/

https://reviews.llvm.org/D60831