Index: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -87,6 +87,15 @@
 void SelectionDAG::DAGUpdateListener::NodeDeleted(SDNode*, SDNode*) {}
 void SelectionDAG::DAGUpdateListener::NodeUpdated(SDNode*) {}
 
+#define DEBUG_TYPE "selectiondag"
+
+static void NewSDValueDbgMsg(SDValue V, StringRef Msg) {
+  DEBUG(
+    dbgs() << Msg;
+    V.dump();
+  );
+}
+
 //===----------------------------------------------------------------------===//
 //                              ConstantFPSDNode Class
 //===----------------------------------------------------------------------===//
@@ -1158,7 +1167,10 @@
     SmallVector<SDValue, 8> Ops;
     for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i)
       Ops.insert(Ops.end(), EltParts.begin(), EltParts.end());
-    return getNode(ISD::BITCAST, DL, VT, getBuildVector(ViaVecVT, DL, Ops));
+
+    SDValue V = getNode(ISD::BITCAST, DL, VT, getBuildVector(ViaVecVT, DL, Ops));
+    NewSDValueDbgMsg(V, "Creating constant: ");
+    return V;
   }
 
   assert(Elt->getBitWidth() == EltVT.getSizeInBits() &&
@@ -1183,6 +1195,8 @@
   SDValue Result(N, 0);
   if (VT.isVector())
     Result = getSplatBuildVector(VT, DL, Result);
+
+  NewSDValueDbgMsg(Result, "Creating constant: ");
   return Result;
 }
 
@@ -1224,6 +1238,7 @@
   SDValue Result(N, 0);
   if (VT.isVector())
     Result = getSplatBuildVector(VT, DL, Result);
+  NewSDValueDbgMsg(Result, "Creating fp constant: ");
   return Result;
 }
 
@@ -3456,7 +3471,9 @@
                ? DAG.getZExtOrTrunc(Op, DL, SVT)
                : DAG.getSExtOrTrunc(Op, DL, SVT);
 
-  return DAG.getBuildVector(VT, DL, Elts);
+  SDValue V = DAG.getBuildVector(VT, DL, Elts);
+  NewSDValueDbgMsg(V, "New node fold concat vectors: ");
+  return V;
 }
 
 /// Gets or creates the specified node.
@@ -3472,7 +3489,9 @@
   CSEMap.InsertNode(N, IP);
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
@@ -3833,7 +3852,9 @@
   }
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 static std::pair<APInt, bool> FoldValue(unsigned Opcode, const APInt &C1,
@@ -4106,7 +4127,9 @@
     ScalarResults.push_back(ScalarResult);
   }
 
-  return getBuildVector(VT, DL, ScalarResults);
+  SDValue V = getBuildVector(VT, DL, ScalarResults);
+  NewSDValueDbgMsg(V, "New node fold constant vector: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
@@ -4606,7 +4629,9 @@
   }
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
@@ -4641,8 +4666,10 @@
       return V;
     // Vector constant folding.
     SDValue Ops[] = {N1, N2, N3};
-    if (SDValue V = FoldConstantVectorArithmetic(Opcode, DL, VT, Ops))
+    if (SDValue V = FoldConstantVectorArithmetic(Opcode, DL, VT, Ops)) {
+      NewSDValueDbgMsg(V, "New node vector constant folding: ");
       return V;
+    }
     break;
   }
   case ISD::SELECT:
@@ -4714,7 +4741,9 @@
   }
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,