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/ADT/VectorExtras.h"
19 #include "llvm/Target/TargetLowering.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
27 // Start the numbering where the builting ops and target ops leave off.
28 FIRST_NUMBER = ISD::BUILTIN_OP_END+Alpha::INSTRUCTION_LIST_END,
29 //These corrospond to the identical Instruction
30 ITOFT_, FTOIT_, CVTQT_, CVTQS_, CVTTQ_,
32 /// GPRelHi/GPRelLo - These represent the high and low 16-bit
33 /// parts of a global address respectively.
36 /// RetLit - Literal Relocation of a Global
39 /// GlobalBaseReg - used to restore the GOT ptr
42 /// GlobalRetAddr - used to restore the return address
45 /// CALL - Normal call.
48 /// DIVCALL - used for special library calls for div and rem
51 /// return flag operand
57 class AlphaTargetLowering : public TargetLowering {
58 int VarArgsOffset; // What is the offset to the first vaarg
59 int VarArgsBase; // What is the base FrameIndex
60 unsigned GP; //GOT vreg
61 unsigned RA; //Return Address
64 AlphaTargetLowering(TargetMachine &TM);
66 /// LowerOperation - Provide custom lowering hooks for some operations.
68 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
69 virtual SDOperand CustomPromoteOperation(SDOperand Op, SelectionDAG &DAG);
71 //Friendly names for dumps
72 const char *getTargetNodeName(unsigned Opcode) const;
74 /// LowerCallTo - This hook lowers an abstract call to a function into an
76 virtual std::pair<SDOperand, SDOperand>
77 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
78 bool isTailCall, SDOperand Callee, ArgListTy &Args,
81 ConstraintType getConstraintType(char ConstraintLetter) const;
84 getRegClassForInlineAsmConstraint(const std::string &Constraint,
85 MVT::ValueType VT) const;
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