1 //===-- IA64ISelLowering.h - IA64 DAG Lowering Interface --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Duraid Madina and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that IA64 uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_IA64_IA64ISELLOWERING_H
16 #define LLVM_TARGET_IA64_IA64ISELLOWERING_H
18 #include "llvm/Target/TargetLowering.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
25 // Start the numbering where the builting ops and target ops leave off.
26 FIRST_NUMBER = ISD::BUILTIN_OP_END+IA64::INSTRUCTION_LIST_END,
28 /// GETFD - the getf.d instruction takes a floating point operand and
29 /// returns its 64-bit memory representation as an i64
32 // TODO: explain this hack
35 // RET_FLAG - Return with a flag operand
40 class IA64TargetLowering : public TargetLowering {
41 int VarArgsFrameIndex; // FrameIndex for start of varargs area.
42 //int ReturnAddrIndex; // FrameIndex for return slot.
43 unsigned GP, SP, RP; // FIXME - clean this mess up
46 IA64TargetLowering(TargetMachine &TM);
48 unsigned VirtGPR; // this is public so it can be accessed in the selector
49 // for ISD::RET. add an accessor instead? FIXME
51 /// LowerOperation - Provide custom lowering hooks for some operations.
53 // XXX virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
55 const char *getTargetNodeName(unsigned Opcode) const;
57 /// LowerArguments - This hook must be implemented to indicate how we should
58 /// lower the arguments for the specified function, into the specified DAG.
59 virtual std::vector<SDOperand>
60 LowerArguments(Function &F, SelectionDAG &DAG);
62 /// LowerCallTo - This hook lowers an abstract call to a function into an
64 virtual std::pair<SDOperand, SDOperand>
65 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg,
67 bool isTailCall, SDOperand Callee, ArgListTy &Args,
70 /// LowerReturnTo - This spits out restore-previous-frame-state+br.ret
72 virtual SDOperand LowerReturnTo(SDOperand Chain, SDOperand Op,
75 /// LowerOperation - for custom lowering specific ops
76 /// (currently, only "ret void")
77 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
79 virtual std::pair<SDOperand, SDOperand>
80 LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
83 // XXX virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
84 // XXX MachineBasicBlock *MBB);
88 #endif // LLVM_TARGET_IA64_IA64ISELLOWERING_H