[LoopUnroll] Remove redundant llvm.dbg instructions after blocks

coderchenlin · chenlin (CG) · commit 5bd126f6cca6 · 2024-04-18T14:14:06.000+08:00
merged. (#89073)
diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -333,6 +333,10 @@ 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.
+  if (PredBB->getParent()->getSubprogram())
+    RemoveRedundantDbgInstrs(PredBB);
+
   return true;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -333,6 +333,10 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock BB, DomTreeUpdater DTU,`
`333`	`333`	`// Finally, erase the old block and update dominator info.`
`334`	`334`	`DeleteDeadBlock(BB, DTU);`
`335`	`335`
	`336`	`+ // Remove redundant "llvm.dbg" instrunctions after blocks merged.`
	`337`	`+ if (PredBB->getParent()->getSubprogram())`
	`338`	`+ RemoveRedundantDbgInstrs(PredBB);`
	`339`	`+`
`336`	`340`	`return true;`
`337`	`341`	`}`
`338`	`342`