Preserve DbgLoc when DeadArgumentElimination rewrites a 'ret'.

Fixes PR46002.

diff --git a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
index 5dc1a6f..00fcba4 100644 (file)
--- a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -1056,7 +1056,8 @@ bool DeadArgumentEliminationPass::RemoveDeadStuffFromFunction(Function *F) {
         }
         // Replace the return instruction with one returning the new return
         // value (possibly 0 if we became void).
-        ReturnInst::Create(F->getContext(), RetVal, RI);
+        auto *NewRet = ReturnInst::Create(F->getContext(), RetVal, RI);
+        NewRet->setDebugLoc(RI->getDebugLoc());
         BB.getInstList().erase(RI);
       }
 

diff --git a/llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll b/llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll
index de5082d..ab7645e 100644 (file)
--- a/llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll
+++ b/llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll
@@ -63,6 +63,7 @@ if.end3:                                          ; preds = %if.end
 
 cleanup:                                          ; preds = %if.end3, %if.then2, %if.then
   %retval.0 = phi i1 [ false, %if.then2 ], [ true, %if.end3 ], [ false, %if.then ]
+; CHECK: ret void, !dbg
   ret i1 %retval.0, !dbg !56
 }