X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FRegisterScavenging.cpp;h=ca02aa1b81436721f72eec90325ecdf7451f432e;hb=70303688bc489a316cb0892499ac4024088fa58a;hp=e2c25aba02e09d5dec372affe256aae6e6b3c14d;hpb=2048e4ab7fb4ed45bae2159bae600ddf610303b1;p=oota-llvm.git

diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp
index e2c25aba02e..ca02aa1b814 100644
--- a/lib/CodeGen/RegisterScavenging.cpp
+++ b/lib/CodeGen/RegisterScavenging.cpp
@@ -181,12 +181,14 @@ void RegScavenger::forward() {
   // Verify uses and defs.
   for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
     const MachineOperand &MO = MI->getOperand(i);
-    if (!MO.isReg() || MO.isUndef())
+    if (!MO.isReg())
       continue;
     unsigned Reg = MO.getReg();
     if (!Reg || isReserved(Reg))
       continue;
     if (MO.isUse()) {
+      if (MO.isUndef())
+        continue;
       if (!isUsed(Reg)) {
         // Check if it's partial live: e.g.
         // D0 = insert_subreg D0<undef>, S0
@@ -204,6 +206,7 @@ void RegScavenger::forward() {
             break;
           }
         assert(SubUsed && "Using an undefined register!");
+        (void)SubUsed;
       }
       assert((!EarlyClobberRegs.test(Reg) || MI->isRegTiedToDefOperand(i)) &&
              "Using an early clobbered register!");