Hexagon backend support

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146412 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Hexagon/HexagonSubtarget.h

@@ -0,0 +1,74 @@
+//==-- HexagonSubtarget.h - Define Subtarget for the Hexagon ----*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the Hexagon specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef Hexagon_SUBTARGET_H
+#define Hexagon_SUBTARGET_H
+
+#include "llvm/Target/TargetSubtargetInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include <string>
+
+#define GET_SUBTARGETINFO_HEADER
+#include "HexagonGenSubtargetInfo.inc"
+
+#define Hexagon_SMALL_DATA_THRESHOLD 8
+
+namespace llvm {
+
+class HexagonSubtarget : public HexagonGenSubtargetInfo {
+
+  bool UseMemOps;
+
+public:
+  enum HexagonArchEnum {
+    V1, V2, V3, V4
+  };
+
+  HexagonArchEnum HexagonArchVersion;
+  std::string CPUString;
+  InstrItineraryData InstrItins;
+
+public:
+  HexagonSubtarget(StringRef TT, StringRef CPU, StringRef FS);
+
+  /// getInstrItins - Return the instruction itineraies based on subtarget
+  /// selection.
+  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
+
+
+  /// ParseSubtargetFeatures - Parses features string setting specified
+  /// subtarget options.  Definition of function is auto generated by tblgen.
+  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
+
+  bool hasV2TOps () const { return HexagonArchVersion >= V2; }
+  bool hasV2TOpsOnly () const { return HexagonArchVersion == V2; }
+  bool hasV3TOps () const { return HexagonArchVersion >= V3; }
+  bool hasV3TOpsOnly () const { return HexagonArchVersion == V3; }
+  bool hasV4TOps () const { return HexagonArchVersion >= V4; }
+  bool useMemOps () const { return HexagonArchVersion >= V4 && UseMemOps; }
+
+  bool isSubtargetV2() const { return HexagonArchVersion == V2;}
+  const std::string &getCPUString () const { return CPUString; }
+
+  // Threshold for small data section
+  unsigned getSmallDataThreshold() const {
+    return Hexagon_SMALL_DATA_THRESHOLD;
+  }
+  const HexagonArchEnum &getHexagonArchVersion() const {
+    return  HexagonArchVersion;
+  }
+};
+
+} // end namespace llvm
+
+#endif