1 //===-- AlphaISelLowering.h - Alpha DAG Lowering Interface ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Andrew Lenharth 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 Alpha uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
16 #define LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
18 #include "llvm/Target/TargetLowering.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
26 // Start the numbering where the builting ops and target ops leave off.
27 FIRST_NUMBER = ISD::BUILTIN_OP_END+Alpha::INSTRUCTION_LIST_END,
28 //These corrospond to the identical Instruction
29 ITOFT_, FTOIT_, CVTQT_, CVTQS_,
33 class AlphaTargetLowering : public TargetLowering {
34 int VarArgsOffset; // What is the offset to the first vaarg
35 int VarArgsBase; // What is the base FrameIndex
36 unsigned GP; //GOT vreg
37 unsigned RA; //Return Address
40 AlphaTargetLowering(TargetMachine &TM);
42 /// LowerOperation - Provide custom lowering hooks for some operations.
44 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
46 /// LowerArguments - This hook must be implemented to indicate how we should
47 /// lower the arguments for the specified function, into the specified DAG.
48 virtual std::vector<SDOperand>
49 LowerArguments(Function &F, SelectionDAG &DAG);
51 /// LowerCallTo - This hook lowers an abstract call to a function into an
53 virtual std::pair<SDOperand, SDOperand>
54 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
55 bool isTailCall, SDOperand Callee, ArgListTy &Args,
58 virtual SDOperand LowerVAStart(SDOperand Chain, SDOperand VAListP,
59 Value *VAListV, SelectionDAG &DAG);
60 virtual SDOperand LowerVACopy(SDOperand Chain, SDOperand SrcP, Value *SrcV,
61 SDOperand DestP, Value *DestV,
63 virtual std::pair<SDOperand,SDOperand>
64 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
65 const Type *ArgTy, SelectionDAG &DAG);
67 void restoreGP(MachineBasicBlock* BB);
68 void restoreRA(MachineBasicBlock* BB);
69 unsigned getVRegGP() { return GP; }
70 unsigned getVRegRA() { return RA; }
71 bool hasITOF() { return useITOF; }
75 #endif // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H