Undefined value in reg 0 may need a marker to identify end of source range.

This will be used to truncate live range of DBG_VALUE instruction by register allocator and friends.

llvm-svn: 121061

1 files changed, 2 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index f2c7238f5fa..f43055054e4 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -2783,16 +2783,14 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
         DIVariable DV(MI->getOperand(MI->getNumOperands() - 1).getMetadata());
         if (!DV.Verify()) continue;
         // If DBG_VALUE is for a local variable then it needs a label.
-        if (DV.getTag() != dwarf::DW_TAG_arg_variable
-            && isDbgValueInUndefinedReg(MI) == false)
+        if (DV.getTag() != dwarf::DW_TAG_arg_variable)
           InsnNeedsLabel.insert(MI);
         // DBG_VALUE for inlined functions argument needs a label.
         else if (!DISubprogram(getDISubprogram(DV.getContext())).
                  describes(MF->getFunction()))
           InsnNeedsLabel.insert(MI);
         // DBG_VALUE indicating argument location change needs a label.
-        else if (isDbgValueInUndefinedReg(MI) == false
-                 && !ProcessedArgs.insert(DV))
+        else if (!ProcessedArgs.insert(DV))
           InsnNeedsLabel.insert(MI);
       } else {
         // If location is unknown then instruction needs a location only if