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. These nodes have
33 /// two operands, the first of which must be a
34 /// TargetGlobalAddress, and the second of which must be a
35 /// Constant. Selected naively, these turn into 'ldah R(G)' and
36 /// 'lda R(C)', though these are usually folded into other nodes.
39 /// GlobalBaseReg, used to restore the GOT ptr
45 class AlphaTargetLowering : public TargetLowering {
46 int VarArgsOffset; // What is the offset to the first vaarg
47 int VarArgsBase; // What is the base FrameIndex
48 unsigned GP; //GOT vreg
49 unsigned RA; //Return Address
52 AlphaTargetLowering(TargetMachine &TM);
54 /// LowerOperation - Provide custom lowering hooks for some operations.
56 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
58 /// LowerArguments - This hook must be implemented to indicate how we should
59 /// lower the arguments for the specified function, into the specified DAG.
60 virtual std::vector<SDOperand>
61 LowerArguments(Function &F, SelectionDAG &DAG);
63 /// LowerCallTo - This hook lowers an abstract call to a function into an
65 virtual std::pair<SDOperand, SDOperand>
66 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
67 bool isTailCall, SDOperand Callee, ArgListTy &Args,
70 virtual SDOperand LowerVAStart(SDOperand Chain, SDOperand VAListP,
71 Value *VAListV, SelectionDAG &DAG);
72 virtual SDOperand LowerVACopy(SDOperand Chain, SDOperand SrcP, Value *SrcV,
73 SDOperand DestP, Value *DestV,
75 virtual std::pair<SDOperand,SDOperand>
76 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
77 const Type *ArgTy, SelectionDAG &DAG);
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