Added a more function PIC16 backend. However to get this working a patch in

ExpandIntegerOperand (LegalizeIntegerTypes.cpp) is needed which is yet to be reworked and submitted. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59617 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PIC16/PIC16ISelDAGToDAG.h

@@ -0,0 +1,60 @@
+//===-- PIC16ISelDAGToDAG.cpp - A dag to dag inst selector for PIC16 ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source 
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an instruction selector for the PIC16 target.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "pic16-isel"
+
+#include "PIC16.h"
+#include "PIC16ISelLowering.h"
+#include "PIC16RegisterInfo.h"
+#include "PIC16TargetMachine.h"
+#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Intrinsics.h"
+using namespace llvm;
+
+namespace {
+
+class VISIBILITY_HIDDEN PIC16DAGToDAGISel : public SelectionDAGISel {
+
+  /// TM - Keep a reference to PIC16TargetMachine.
+  PIC16TargetMachine &TM;
+
+  /// PIC16Lowering - This object fully describes how to lower LLVM code to an
+  /// PIC16-specific SelectionDAG.
+  PIC16TargetLowering PIC16Lowering;
+
+public:
+  explicit PIC16DAGToDAGISel(PIC16TargetMachine &tm) : 
+        SelectionDAGISel(PIC16Lowering),
+        TM(tm), PIC16Lowering(*TM.getTargetLowering()) {}
+  
+  // Pass Name
+  virtual const char *getPassName() const {
+    return "PIC16 DAG->DAG Pattern Instruction Selection";
+  } 
+
+  virtual void InstructionSelect();
+  
+private:
+  // Include the pieces autogenerated from the target description.
+#include "PIC16GenDAGISel.inc"
+
+  SDNode *Select(SDValue N);
+
+  // Match direct address complex pattern.
+  bool SelectDirectAddr(SDValue Op, SDValue N, SDValue &Address);
+
+};
+
+}
+