llvm-mirror/lib/Target/Sparc/SparcISelLowering.h

//===-- SparcISelLowering.h - Sparc 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 Sparc uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//

#ifndef SPARC_ISELLOWERING_H
#define SPARC_ISELLOWERING_H

#include "llvm/Target/TargetLowering.h"
#include "Sparc.h"

namespace llvm {
  namespace SPISD {
    enum {
      FIRST_NUMBER = ISD::BUILTIN_OP_END+SP::INSTRUCTION_LIST_END,
      CMPICC,      // Compare two GPR operands, set icc.
      CMPFCC,      // Compare two FP operands, set fcc.
      BRICC,       // Branch to dest on icc condition
      BRFCC,       // Branch to dest on fcc condition
      SELECT_ICC,  // Select between two values using the current ICC flags.
      SELECT_FCC,  // Select between two values using the current FCC flags.
      
      Hi, Lo,      // Hi/Lo operations, typically on a global address.
      
      FTOI,        // FP to Int within a FP register.
      ITOF,        // Int to FP within a FP register.
      
      CALL,        // A call instruction.
      RET_FLAG     // Return with a flag operand.
    };
  }
  
  class SparcTargetLowering : public TargetLowering {
    int VarArgsFrameOffset;   // Frame offset to start of varargs area.
  public:
    SparcTargetLowering(TargetMachine &TM);
    virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
    
    int getVarArgsFrameOffset() const { return VarArgsFrameOffset; }
    
    /// computeMaskedBitsForTargetNode - Determine which of the bits specified 
    /// in Mask are known to be either zero or one and return them in the 
    /// KnownZero/KnownOne bitsets.
    virtual void computeMaskedBitsForTargetNode(const SDOperand Op,
                                                const APInt &Mask,
                                                APInt &KnownZero, 
                                                APInt &KnownOne,
                                                const SelectionDAG &DAG,
                                                unsigned Depth = 0) const;
    
    virtual std::vector<SDOperand>
      LowerArguments(Function &F, SelectionDAG &DAG);
    virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
                                                        MachineBasicBlock *MBB);
    
    virtual const char *getTargetNodeName(unsigned Opcode) const;
  };
} // end namespace llvm

#endif    // SPARC_ISELLOWERING_H