[PATCH] D80756: Preserve DbgLoc when DeadArgumentElimination rewrites a 'ret'.

[Paul Robinson via Phabricator via llvm-commits]

probinson created this revision.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.
probinson added reviewers: dblaikie, jmorse.
probinson added a project: debug-info.

Fixes PR46002.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80756

Files:
  llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
  llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll


Index: llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll
===================================================================
--- llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll
+++ llvm/test/Transforms/DeadArgElim/dbginfo-preserve-dbgloc.ll
@@ -63,6 +63,7 @@
 
 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
 }
 
Index: llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
===================================================================
--- llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -1056,7 +1056,8 @@
         }
         // 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);
       }
 


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