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 /// DIVCALL - used for special library calls for div and rem
45 LDQ_, LDT_, LDS_, LDL_, LDWU_, LDBU_,
46 STQ_, STT_, STS_, STL_, STW_, STB_,
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);
63 //Friendly names for dumps
64 const char *getTargetNodeName(unsigned Opcode) const;
66 /// LowerArguments - This hook must be implemented to indicate how we should
67 /// lower the arguments for the specified function, into the specified DAG.
68 virtual std::vector<SDOperand>
69 LowerArguments(Function &F, SelectionDAG &DAG);
71 /// LowerCallTo - This hook lowers an abstract call to a function into an
73 virtual std::pair<SDOperand, SDOperand>
74 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
75 bool isTailCall, SDOperand Callee, ArgListTy &Args,
78 virtual SDOperand LowerVAStart(SDOperand Chain, SDOperand VAListP,
79 Value *VAListV, SelectionDAG &DAG);
80 virtual SDOperand LowerVACopy(SDOperand Chain, SDOperand SrcP, Value *SrcV,
81 SDOperand DestP, Value *DestV,
83 virtual std::pair<SDOperand,SDOperand>
84 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
85 const Type *ArgTy, SelectionDAG &DAG);
87 void restoreGP(MachineBasicBlock* BB);
88 void restoreRA(MachineBasicBlock* BB);
89 unsigned getVRegGP() { return GP; }
90 unsigned getVRegRA() { return RA; }
91 bool hasITOF() { return useITOF; }
95 #endif // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H