X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FLivePhysRegs.cpp;h=eef7643367fb672af63538cec3a6759f7659cc03;hb=9758b4ae957d85e4b1e7fff1592f276ae684ee98;hp=b6369275051faed35ccb43b0349bfa62615ff1e3;hpb=46356f6f6fb1b67c4f585139527a998a65289ce9;p=oota-llvm.git

diff --git a/lib/CodeGen/LivePhysRegs.cpp b/lib/CodeGen/LivePhysRegs.cpp
index b6369275051..eef7643367f 100644
--- a/lib/CodeGen/LivePhysRegs.cpp
+++ b/lib/CodeGen/LivePhysRegs.cpp
@@ -77,8 +77,9 @@ void LivePhysRegs::stepForward(const MachineInstr &MI,
       if (Reg == 0)
         continue;
       if (O->isDef()) {
-        if (!O->isDead())
-          Clobbers.push_back(std::make_pair(Reg, &*O));
+        // Note, dead defs are still recorded.  The caller should decide how to
+        // handle them.
+        Clobbers.push_back(std::make_pair(Reg, &*O));
       } else {
         if (!O->isKill())
           continue;
@@ -90,8 +91,12 @@ void LivePhysRegs::stepForward(const MachineInstr &MI,
   }
 
   // Add defs to the set.
-  for (auto Reg : Clobbers)
+  for (auto Reg : Clobbers) {
+    // Skip dead defs.  They shouldn't be added to the set.
+    if (Reg.second->isReg() && Reg.second->isDead())
+      continue;
     addReg(Reg.first);
+  }
 }
 
 /// Prin the currently live registers to OS.