1 files changed, 6 insertions, 7 deletions
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 63413d77cf..3f7e4a5fac 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -671,13 +671,12 @@ bool FastISel::SelectBitCast(const User *I) {
   if (SrcVT.getSimpleVT() == DstVT.getSimpleVT()) {
     TargetRegisterClass* SrcClass = TLI.getRegClassFor(SrcVT);
     TargetRegisterClass* DstClass = TLI.getRegClassFor(DstVT);
-    ResultReg = createResultReg(DstClass);
-    
-    bool InsertedCopy = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
-                                         ResultReg, Op0,
-                                         DstClass, SrcClass, DL);
-    if (!InsertedCopy)
-      ResultReg = 0;
+    // Don't attempt a cross-class copy. It will likely fail.
+    if (SrcClass == DstClass) {
+      ResultReg = createResultReg(DstClass);
+      BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+              ResultReg).addReg(Op0);
+    }
   }
   
   // If the reg-reg copy failed, select a BIT_CONVERT opcode.