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//===-- 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 "PIC16.h"
#include "PIC16Subtarget.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.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 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG);
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
SDValue RemoveHiLo(SDNode *, SelectionDAG &DAG,
DAGCombinerInfo &DCI) const;
SDValue LowerADDSUB(SDNode *, SelectionDAG &DAG,
DAGCombinerInfo &DCI) const;
SDValue 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 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
// utility function.
const SDValue *findLoadi8(const SDValue &Src, SelectionDAG &DAG) const;
};
} // namespace llvm
#endif // PIC16ISELLOWERING_H
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