[llvm-commits] [llvm] r95890 - /llvm/trunk/lib/CodeGen/DeadMachineInstructionElim.cpp

[Dale Johannesen]

Author: johannes
Date: Thu Feb 11 12:23:23 2010
New Revision: 95890

URL: http://llvm.org/viewvc/llvm-project?rev=95890&view=rev
Log:
Allow for more than one DBG_VALUE targeting the
same dead instruction.


Modified:
    llvm/trunk/lib/CodeGen/DeadMachineInstructionElim.cpp

Modified: llvm/trunk/lib/CodeGen/DeadMachineInstructionElim.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/DeadMachineInstructionElim.cpp?rev=95890&r1=95889&r2=95890&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/DeadMachineInstructionElim.cpp (original)
+++ llvm/trunk/lib/CodeGen/DeadMachineInstructionElim.cpp Thu Feb 11 12:23:23 2010
@@ -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);
         }
       }