llvm-6502/lib/Target/Alpha/AlphaISelLowering.h
2006-01-27 23:39:00 +00:00

90 lines
2.9 KiB
C++

//===-- AlphaISelLowering.h - Alpha DAG Lowering Interface ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Andrew Lenharth and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that Alpha uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
#define LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
#include "llvm/Target/TargetLowering.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "Alpha.h"
namespace llvm {
namespace AlphaISD {
enum NodeType {
// Start the numbering where the builting ops and target ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END+Alpha::INSTRUCTION_LIST_END,
//These corrospond to the identical Instruction
ITOFT_, FTOIT_, CVTQT_, CVTQS_, CVTTQ_,
/// GPRelHi/GPRelLo - These represent the high and low 16-bit
/// parts of a global address respectively.
GPRelHi, GPRelLo,
/// RetLit - Literal Relocation of a Global
RelLit,
/// GlobalBaseReg - used to restore the GOT ptr
GlobalBaseReg,
/// CALL - Normal call.
CALL,
/// DIVCALL - used for special library calls for div and rem
DivCall,
///LD, ST
LDQ_, LDT_, LDS_, LDL_, LDWU_, LDBU_,
STQ_, STT_, STS_, STL_, STW_, STB_,
};
}
class AlphaTargetLowering : public TargetLowering {
int VarArgsOffset; // What is the offset to the first vaarg
int VarArgsBase; // What is the base FrameIndex
unsigned GP; //GOT vreg
unsigned RA; //Return Address
bool useITOF;
public:
AlphaTargetLowering(TargetMachine &TM);
/// LowerOperation - Provide custom lowering hooks for some operations.
///
virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
//Friendly names for dumps
const char *getTargetNodeName(unsigned Opcode) const;
/// LowerArguments - This hook must be implemented to indicate how we should
/// lower the arguments for the specified function, into the specified DAG.
virtual std::vector<SDOperand>
LowerArguments(Function &F, SelectionDAG &DAG);
/// LowerCallTo - This hook lowers an abstract call to a function into an
/// actual call.
virtual std::pair<SDOperand, SDOperand>
LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
bool isTailCall, SDOperand Callee, ArgListTy &Args,
SelectionDAG &DAG);
void restoreGP(MachineBasicBlock* BB);
void restoreRA(MachineBasicBlock* BB);
unsigned getVRegGP() { return GP; }
unsigned getVRegRA() { return RA; }
bool hasITOF() { return useITOF; }
};
}
#endif // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H