Try harder to get a consistent floating point results.

[oota-llvm.git] / lib / CodeGen / SelectionDAG / DAGCombiner.cpp

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 20b0981e973e0e56efc4b0b9d9f99c98f23aff51..805cc9e0f27f75d8e1e6ee3ae8bae09e4e319652 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -1635,19 +1635,8 @@ static SDValue tryFoldToZero(SDLoc DL, const TargetLowering &TLI, EVT VT,
                              bool LegalOperations, bool LegalTypes) {
   if (!VT.isVector())
     return DAG.getConstant(0, VT);
-  if (!LegalOperations || TLI.isOperationLegal(ISD::BUILD_VECTOR, VT)) {
-    // Produce a vector of zeros.
-    EVT ElemTy = VT.getVectorElementType();
-    if (LegalTypes && TLI.getTypeAction(*DAG.getContext(), ElemTy) ==
-                      TargetLowering::TypePromoteInteger)
-      ElemTy = TLI.getTypeToTransformTo(*DAG.getContext(), ElemTy);
-    assert((!LegalTypes || TLI.isTypeLegal(ElemTy)) &&
-           "Type for zero vector elements is not legal");
-    SDValue El = DAG.getConstant(0, ElemTy);
-    std::vector<SDValue> Ops(VT.getVectorNumElements(), El);
-    return DAG.getNode(ISD::BUILD_VECTOR, DL, VT,
-      &Ops[0], Ops.size());
-  }
+  if (!LegalOperations || TLI.isOperationLegal(ISD::BUILD_VECTOR, VT))
+    return DAG.getConstant(0, VT);
   return SDValue();
 }
 
@@ -8703,6 +8692,11 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode* St) {
         Index = STn;
         break;
       } else if (LoadSDNode *Ldn = dyn_cast<LoadSDNode>(NextInChain)) {
+        if (Ldn->isVolatile()) {
+          Index = NULL;
+          break;
+        }
+
         // Save the load node for later. Continue the scan.
         AliasLoadNodes.push_back(Ldn);
         NextInChain = Ldn->getChain().getNode();