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//===-- IA64ISelLowering.h - IA64 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 IA64 uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_IA64_IA64ISELLOWERING_H
#define LLVM_TARGET_IA64_IA64ISELLOWERING_H
#include "llvm/Target/TargetLowering.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "IA64.h"
namespace llvm {
namespace IA64ISD {
enum NodeType {
// Start the numbering where the builting ops and target ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END+IA64::INSTRUCTION_LIST_END,
/// GETFD - the getf.d instruction takes a floating point operand and
/// returns its 64-bit memory representation as an i64
GETFD,
// TODO: explain this hack
BRCALL,
// RET_FLAG - Return with a flag operand
RET_FLAG
};
}
class IA64TargetLowering : public TargetLowering {
int VarArgsFrameIndex; // FrameIndex for start of varargs area.
//int ReturnAddrIndex; // FrameIndex for return slot.
unsigned GP, SP, RP; // FIXME - clean this mess up
public:
explicit IA64TargetLowering(TargetMachine &TM);
unsigned VirtGPR; // this is public so it can be accessed in the selector
// for ISD::RET. add an accessor instead? FIXME
const char *getTargetNodeName(unsigned Opcode) const;
/// LowerArguments - This hook must be implemented to indicate how we should
/// lower the arguments for the specified function, into the specified DAG.
virtual std::vector<SDOperand>
LowerArguments(Function &F, SelectionDAG &DAG);
/// LowerCallTo - This hook lowers an abstract call to a function into an
/// actual call.
virtual std::pair<SDOperand, SDOperand>
LowerCallTo(SDOperand Chain, const Type *RetTy, bool RetTyIsSigned,
bool isVarArg, unsigned CC, bool isTailCall,
SDOperand Callee, ArgListTy &Args, SelectionDAG &DAG);
/// LowerOperation - for custom lowering specific ops
/// (currently, only "ret void")
virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
// XXX virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
// XXX MachineBasicBlock *MBB);
};
}
#endif // LLVM_TARGET_IA64_IA64ISELLOWERING_H
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