1 files changed, 9 insertions, 0 deletions
diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index 0c1d45902f..d215d0c28a 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/lib/CodeGen/LiveRangeEdit.cpp
@@ -249,6 +249,15 @@ void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) {
       // Check if MI reads any unreserved physregs.
       if (Reg && MOI->readsReg() && !MRI.isReserved(Reg))
         ReadsPhysRegs = true;
+      else if (MOI->isDef()) {
+        for (MCRegUnitIterator Units(Reg, MRI.getTargetRegisterInfo());
+             Units.isValid(); ++Units) {
+          if (LiveInterval *LI = LIS.getCachedRegUnit(*Units)) {
+            if (VNInfo *VNI = LI->getVNInfoAt(Idx))
+              LI->removeValNo(VNI);
+          }
+        }
+      }
       continue;
     }
     LiveInterval &LI = LIS.getInterval(Reg);