[llvm] r279437 - Reset isUndef when removing subreg from a def operand

[Krzysztof Parzyszek via llvm-commits]

Author: kparzysz
Date: Mon Aug 22 09:50:12 2016
New Revision: 279437

URL: http://llvm.org/viewvc/llvm-project?rev=279437&view=rev
Log:
Reset isUndef when removing subreg from a def operand

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

Modified: llvm/trunk/lib/CodeGen/MachineInstr.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineInstr.cpp?rev=279437&r1=279436&r2=279437&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineInstr.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineInstr.cpp Mon Aug 22 09:50:12 2016
@@ -93,6 +93,8 @@ void MachineOperand::substPhysReg(unsign
     // Note that getSubReg() may return 0 if the sub-register doesn't exist.
     // That won't happen in legal code.
     setSubReg(0);
+    if (isDef())
+      setIsUndef(false);
   }
   setReg(Reg);
 }