[llvm] [LoopUnroll] Remove redundant llvm.dbg instructions after blocks (PR #89069)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: CL (coderchenlin)

<details>
<summary>Changes</summary>

merged.

---
Full diff: https://github.com/llvm/llvm-project/pull/89069.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Utils/BasicBlockUtils.cpp (+3) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index 5aa59acfa6df99..ca9d7649ea9826 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -333,6 +333,9 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, DomTreeUpdater *DTU,
   // Finally, erase the old block and update dominator info.
   DeleteDeadBlock(BB, DTU);
 
+  // Remove redundant "llvm.dbg" instrunctions after blocks merged.
+  RemoveRedundantDbgInstrs(PredBB);
+
   return true;
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/89069