Use a kill, not a dead definition, update comment
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6131 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp
index 4a23eb2..11835cb 100644
--- a/lib/CodeGen/PHIElimination.cpp
+++ b/lib/CodeGen/PHIElimination.cpp
@@ -87,12 +87,11 @@
MachineInstr *PHICopy = *(AfterPHIsIt-1);
// Add information to LiveVariables to know that the incoming value is
- // dead. This says that the register is dead, not killed, because we
- // cannot use the live variable information to indicate that the variable
- // is defined in multiple entry blocks. Instead, we pretend that this
- // instruction defined it and killed it at the same time.
+ // killed. Note that because the value is defined in several places (once
+ // each for each incoming block), the "def" block and instruction fields
+ // for the VarInfo is not filled in.
//
- LV->addVirtualRegisterDead(IncomingReg, &MBB, PHICopy);
+ LV->addVirtualRegisterKilled(IncomingReg, &MBB, PHICopy);
// Since we are going to be deleting the PHI node, if it is the last use
// of any registers, or if the value itself is dead, we need to move this