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_, CVTTQ_,
31 /// GPRelHi/GPRelLo - These represent the high and low 16-bit
32 /// parts of a global address respectively.
35 /// RetLit - Literal Relocation of a Global
38 /// GlobalBaseReg - used to restore the GOT ptr
41 /// CALL - Normal call.
44 /// DIVCALL - used for special library calls for div and rem
50 class AlphaTargetLowering : public TargetLowering {
51 int VarArgsOffset; // What is the offset to the first vaarg
52 int VarArgsBase; // What is the base FrameIndex
53 unsigned GP; //GOT vreg
54 unsigned RA; //Return Address
57 AlphaTargetLowering(TargetMachine &TM);
59 /// LowerOperation - Provide custom lowering hooks for some operations.
61 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
62 virtual SDOperand CustomPromoteOperation(SDOperand Op, SelectionDAG &DAG);
64 //Friendly names for dumps
65 const char *getTargetNodeName(unsigned Opcode) const;
67 /// LowerArguments - This hook must be implemented to indicate how we should
68 /// lower the arguments for the specified function, into the specified DAG.
69 virtual std::vector<SDOperand>
70 LowerArguments(Function &F, SelectionDAG &DAG);
72 /// LowerCallTo - This hook lowers an abstract call to a function into an
74 virtual std::pair<SDOperand, SDOperand>
75 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
76 bool isTailCall, SDOperand Callee, ArgListTy &Args,
79 void restoreGP(MachineBasicBlock* BB);
80 void restoreRA(MachineBasicBlock* BB);
81 unsigned getVRegGP() { return GP; }
82 unsigned getVRegRA() { return RA; }
83 bool hasITOF() { return useITOF; }
87 #endif // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H