Allow for more than one DBG_VALUE targeting the
same dead instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95890 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp
index 6e01e59..7ed1a6a 100644
--- a/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -117,10 +117,10 @@
// the former operand will then be deleted normally.
if (MI->getNumOperands()==3 && MI->getOperand(0).isReg()) {
unsigned Reg = MI->getOperand(0).getReg();
- MachineRegisterInfo::use_iterator I = MRI->use_begin(Reg);
- assert(I != MRI->use_end());
- if (++I == MRI->use_end())
- // only one use, which must be this DBG_VALUE.
+ MachineRegisterInfo::use_nodbg_iterator I = MRI->use_nodbg_begin(Reg);
+ if (I == MRI->use_nodbg_end())
+ // All uses are DBG_VALUEs. Nullify this one; if we find
+ // others later we will nullify them then.
MI->getOperand(0).setReg(0U);
}
}