1 files changed, 92 insertions, 0 deletions
diff --git a/lib/Target/PIC16/PIC16ISelLowering.h b/lib/Target/PIC16/PIC16ISelLowering.h
new file mode 100644
index 0000000..a94ec4a
--- /dev/null
+++ b/lib/Target/PIC16/PIC16ISelLowering.h
@@ -0,0 +1,92 @@
+//===-- PIC16ISelLowering.h - PIC16 DAG Lowering Interface ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source 
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the interfaces that PIC16 uses to lower LLVM code into a
+// selection DAG.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PIC16ISELLOWERING_H
+#define PIC16ISELLOWERING_H
+
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/Target/TargetLowering.h"
+#include "PIC16.h"
+#include "PIC16Subtarget.h"
+
+namespace llvm {
+  namespace PIC16ISD {
+    enum NodeType {
+      // Start the numbering from where ISD NodeType finishes.
+      FIRST_NUMBER = ISD::BUILTIN_OP_END+PIC16::INSTRUCTION_LIST_END,
+
+      // used for encapsulating the expanded nodes into one node.
+      Package,
+
+      // Get the Higher 16 bits from a 32-bit immediate
+      Hi, 
+
+      // Get the Lower 16 bits from a 32-bit immediate
+      Lo,
+
+      Cmp,	// PIC16 Generic Comparison instruction.
+      Branch,	// PIC16 Generic Branch Instruction.	
+      BTFSS,	// PIC16 BitTest Instruction (Skip if set).
+      BTFSC,	// PIC16 BitTest Instruction (Skip if clear).
+
+      // PIC16 comparison to be converted to either XOR or SUB
+      // Following instructions cater to those convertions.
+      XORCC,	
+      SUBCC,	
+
+      // Get the Global Address wrapped into a wrapper that also captures 
+      // the bank or page.
+      Wrapper,
+      SetBank,
+      SetPage
+    };
+  }
+
+  //===--------------------------------------------------------------------===//
+  // TargetLowering Implementation
+  //===--------------------------------------------------------------------===//
+  class PIC16TargetLowering : public TargetLowering 
+  {
+  public:
+    typedef std::map<SDNode *, SDNode *> NodeMap_t;
+
+    explicit PIC16TargetLowering(PIC16TargetMachine &TM);
+
+    /// LowerOperation - Provide custom lowering hooks for some operations.
+    virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
+
+    SDOperand LowerGlobalAddress(SDOperand Op, SelectionDAG &DAG);
+    SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG);
+    SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG);
+    SDOperand LowerFrameIndex(SDOperand Op, SelectionDAG &DAG);
+    SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG);
+
+    SDOperand RemoveHiLo(SDNode *, SelectionDAG &DAG, 
+			 DAGCombinerInfo &DCI) const;
+    SDOperand LowerADDSUB(SDNode *, SelectionDAG &DAG, 
+			  DAGCombinerInfo &DCI) const;
+    SDOperand LowerLOAD(SDNode *, SelectionDAG &DAG, 
+                        DAGCombinerInfo &DCI) const;
+
+    /// getTargetNodeName - This method returns the name of a target specific 
+    //  DAG node.
+    virtual const char *getTargetNodeName(unsigned Opcode) const;
+    virtual SDOperand PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
+
+    // utility function.
+    const SDOperand *findLoadi8(const SDOperand &Src, SelectionDAG &DAG) const;
+  };
+} // namespace llvm
+
+#endif // PIC16ISELLOWERING_H