[PATCH] D80691: Proposed fix for PR46114

[Qirun Zhang via Phabricator via llvm-commits]

helloqirun updated this revision to Diff 266967.
helloqirun added a comment.

Re-formatted the comment.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80691/new/

https://reviews.llvm.org/D80691

Files:
  llvm/lib/Transforms/Scalar/EarlyCSE.cpp


Index: llvm/lib/Transforms/Scalar/EarlyCSE.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/EarlyCSE.cpp
+++ llvm/lib/Transforms/Scalar/EarlyCSE.cpp
@@ -1136,6 +1136,9 @@
             LLVM_DEBUG(dbgs() << "Skipping due to debug counter\n");
             continue;
           }
+          // Salvage debug info early to be compatible with
+          // removeRedundantDbgInstrsUsingBackwardScan() used in SimplfyCFG.
+          salvageDebugInfoOrMarkUndef(Inst);
           if (!Inst.use_empty())
             Inst.replaceAllUsesWith(Op);
           salvageKnowledge(&Inst, &AC);


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