added a skeleton of the ARM backend

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28301 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMInstrInfo.h

@@ -0,0 +1,57 @@
+//===- ARMInstrInfo.h - ARM Instruction Information --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the "Instituto Nokia de Tecnologia" and
+// is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the ARM implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ARMINSTRUCTIONINFO_H
+#define ARMINSTRUCTIONINFO_H
+
+#include "llvm/Target/TargetInstrInfo.h"
+#include "ARMRegisterInfo.h"
+
+namespace llvm {
+
+class ARMInstrInfo : public TargetInstrInfo {
+  const ARMRegisterInfo RI;
+public:
+  ARMInstrInfo();
+
+  /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
+  /// such, whenever a client has an instance of instruction info, it should
+  /// always be able to get register info as well (through this method).
+  ///
+  virtual const MRegisterInfo &getRegisterInfo() const { return RI; }
+
+  /// Return true if the instruction is a register to register move and
+  /// leave the source and dest operands in the passed parameters.
+  ///
+  virtual bool isMoveInstr(const MachineInstr &MI,
+                           unsigned &SrcReg, unsigned &DstReg) const;
+
+  /// isLoadFromStackSlot - If the specified machine instruction is a direct
+  /// load from a stack slot, return the virtual or physical register number of
+  /// the destination along with the FrameIndex of the loaded stack slot.  If
+  /// not, return 0.  This predicate must return 0 if the instruction has
+  /// any side effects other than loading from the stack slot.
+  virtual unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
+
+  /// isStoreToStackSlot - If the specified machine instruction is a direct
+  /// store to a stack slot, return the virtual or physical register number of
+  /// the source reg along with the FrameIndex of the loaded stack slot.  If
+  /// not, return 0.  This predicate must return 0 if the instruction has
+  /// any side effects other than storing to the stack slot.
+  virtual unsigned isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const;
+};
+
+}
+
+#endif