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diff --git a/llvm/lib/Target/AMDGPU/AMDILSIDevice.h b/llvm/lib/Target/AMDGPU/AMDILSIDevice.h
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+++ b/llvm/lib/Target/AMDGPU/AMDILSIDevice.h
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+//===------- AMDILSIDevice.h - Define SI Device for AMDIL -*- C++ -*------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//==-----------------------------------------------------------------------===//
+//
+// Interface for the subtarget data classes.
+//
+//===---------------------------------------------------------------------===//
+// This file will define the interface that each generation needs to
+// implement in order to correctly answer queries on the capabilities of the
+// specific hardware.
+//===---------------------------------------------------------------------===//
+#ifndef _AMDILSIDEVICE_H_
+#define _AMDILSIDEVICE_H_
+#include "AMDILEvergreenDevice.h"
+#include "AMDILSubtarget.h"
+
+namespace llvm {
+  class AMDILSubtarget;
+//===---------------------------------------------------------------------===//
+// SI generation of devices and their respective sub classes
+//===---------------------------------------------------------------------===//
+
+// The AMDILSIDevice is the base class for all Northern Island series of
+// cards. It is very similiar to the AMDILEvergreenDevice, with the major
+// exception being differences in wavefront size and hardware capabilities.  The
+// SI devices are all 64 wide wavefronts and also add support for signed 24 bit
+// integer operations
+
+  class AMDILSIDevice : public AMDILEvergreenDevice {
+    public:
+      AMDILSIDevice(AMDILSubtarget*);
+      virtual ~AMDILSIDevice();
+      virtual size_t getMaxLDSSize() const;
+      virtual uint32_t getGeneration() const;
+      virtual std::string getDataLayout() const;
+    protected:
+  }; // AMDILSIDevice
+
+} // namespace llvm
+#endif // _AMDILSIDEVICE_H_