Implement the Expand action for binary vector operations to break the binop

into elements and operate on each piece.  This allows generic vector integer
multiplies to work on PPC, though the generated code is horrible.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27347 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 18 insertions, 1 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index f3d2fdfce4..27afe117e6 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1916,12 +1916,29 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
     Result = DAG.UpdateNodeOperands(Result, Tmp1, Tmp2);
       
     switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) {
-    default: assert(0 && "Operation not supported");
+    default: assert(0 && "BinOp legalize operation not supported");
     case TargetLowering::Legal: break;
     case TargetLowering::Custom:
       Tmp1 = TLI.LowerOperation(Result, DAG);
       if (Tmp1.Val) Result = Tmp1;
       break;
+    case TargetLowering::Expand: {
+      assert(MVT::isVector(Node->getValueType(0)) &&
+             "Cannot expand this binary operator!");
+      // Expand the operation into a bunch of nasty scalar code.
+      std::vector<SDOperand> Ops;
+      MVT::ValueType EltVT = MVT::getVectorBaseType(Node->getValueType(0));
+      MVT::ValueType PtrVT = TLI.getPointerTy();
+      for (unsigned i = 0, e = MVT::getVectorNumElements(Node->getValueType(0));
+           i != e; ++i) {
+        SDOperand Idx = DAG.getConstant(i, PtrVT);
+        SDOperand LHS = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Tmp1, Idx);
+        SDOperand RHS = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Tmp2, Idx);
+        Ops.push_back(DAG.getNode(Node->getOpcode(), EltVT, LHS, RHS));
+      }
+      Result = DAG.getNode(ISD::BUILD_VECTOR, Node->getValueType(0), Ops);
+      break;
+    }
     }
     break;