If a vr is already marked alive in a bb, then it has PHI uses that are visited earlier, then it is not killed in the def block (i.e. not dead).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46763 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp
index b39e48d..70c191d 100644
--- a/lib/CodeGen/LiveVariables.cpp
+++ b/lib/CodeGen/LiveVariables.cpp
@@ -436,8 +436,9 @@
if (MO.isRegister() && MO.isDef() && MO.getReg()) {
if (MRegisterInfo::isVirtualRegister(MO.getReg())) {
VarInfo &VRInfo = getVarInfo(MO.getReg());
- // Defaults to dead
- VRInfo.Kills.push_back(MI);
+ if (VRInfo.AliveBlocks.none())
+ // If vr is not alive in any block, then defaults to dead.
+ VRInfo.Kills.push_back(MI);
} else if (MRegisterInfo::isPhysicalRegister(MO.getReg()) &&
!ReservedRegisters[MO.getReg()]) {
HandlePhysRegDef(MO.getReg(), MI);