Add addrspacecast instruction.

Patch by Michele Scandale!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194760 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/ISDOpcodes.h

@@ -419,6 +419,10 @@ namespace ISD {
     /// getNode().
     BITCAST,
 
+    /// ADDRSPACECAST - This operator converts between pointers of different
+    /// address spaces.
+    ADDRSPACECAST,
+
     /// CONVERT_RNDSAT - This operator is used to support various conversions
     /// between various types (float, signed, unsigned and vectors of those
     /// types) with rounding and saturation. NOTE: Avoid using this operator as

include/llvm/CodeGen/SelectionDAG.h

@@ -802,6 +802,10 @@ public:
   /// getMDNode - Return an MDNodeSDNode which holds an MDNode.
   SDValue getMDNode(const MDNode *MD);
 
+  /// getAddrSpaceCast - Return an AddrSpaceCastSDNode.
+  SDValue getAddrSpaceCast(SDLoc dl, EVT VT, SDValue Ptr,
+                           unsigned SrcAS, unsigned DestAS);
+
   /// getShiftAmountOperand - Return the specified value casted to
   /// the target's desired shift amount type.
   SDValue getShiftAmountOperand(EVT LHSTy, SDValue Op);

include/llvm/CodeGen/SelectionDAGNodes.h

@@ -950,6 +950,23 @@ public:
   const SDValue &getValue() const { return Op; }
 };
 
+class AddrSpaceCastSDNode : public UnarySDNode {
+private:
+  unsigned SrcAddrSpace;
+  unsigned DestAddrSpace;
+
+public:
+  AddrSpaceCastSDNode(unsigned Order, DebugLoc dl, EVT VT, SDValue X,
+                      unsigned SrcAS, unsigned DestAS);
+
+  unsigned getSrcAddressSpace() const { return SrcAddrSpace; }
+  unsigned getDestAddressSpace() const { return DestAddrSpace; }
+
+  static bool classof(const SDNode *N) {
+    return N->getOpcode() == ISD::ADDRSPACECAST;
+  }
+};
+
 /// Abstact virtual class for operations for memory operations
 class MemSDNode : public SDNode {
 private: