[PATCH] D140991: [DebugInfo] Replace UndefValue with PoisonValue in DIArgList::handleChangedOperand

[Orlando Cazalet-Hyams via Phabricator via llvm-commits]

Orlando created this revision.
Orlando added reviewers: nlopes, scott.linder, StephenTozer.
Orlando added a project: debug-info.
Herald added a subscriber: hiraditya.
Herald added a project: All.
Orlando requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

This helps towards the effort to remove UndefValue from LLVM.

Related to https://discourse.llvm.org/t/auto-undef-debug-uses-of-a-deleted-value


https://reviews.llvm.org/D140991

Files:
  llvm/lib/IR/DebugInfoMetadata.cpp
  llvm/test/Transforms/GlobalOpt/deadglobal-diarglist-use.ll


Index: llvm/test/Transforms/GlobalOpt/deadglobal-diarglist-use.ll
===================================================================
--- llvm/test/Transforms/GlobalOpt/deadglobal-diarglist-use.ll
+++ llvm/test/Transforms/GlobalOpt/deadglobal-diarglist-use.ll
@@ -9,7 +9,7 @@
 ; CHECK: %struct.S = type { i32 }
 ; CHECK-NOT: @s
 
-; CHECK: call void @llvm.dbg.value(metadata !DIArgList([1 x %struct.S]* undef
+; CHECK: call void @llvm.dbg.value(metadata !DIArgList([1 x %struct.S]* poison
 
 %struct.S = type { i32 }
 
Index: llvm/lib/IR/DebugInfoMetadata.cpp
===================================================================
--- llvm/lib/IR/DebugInfoMetadata.cpp
+++ llvm/lib/IR/DebugInfoMetadata.cpp
@@ -1908,7 +1908,7 @@
       if (NewVM)
         VM = NewVM;
       else
-        VM = ValueAsMetadata::get(UndefValue::get(VM->getValue()->getType()));
+        VM = ValueAsMetadata::get(PoisonValue::get(VM->getValue()->getType()));
     }
   }
   if (Uniq) {


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