1 //===-- llvm/CodeGen/InstrSelection.h ---------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // External interface to instruction selection.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CODEGEN_INSTR_SELECTION_H
15 #define LLVM_CODEGEN_INSTR_SELECTION_H
17 #include "llvm/Instruction.h"
24 class InstructionNode;
26 class MachineCodeForInstruction;
29 //===--------------------- Required Functions ---------------------------------
30 // Target-dependent functions that MUST be implemented for each target.
33 extern void GetInstructionsByRule (InstructionNode* subtreeRoot,
36 TargetMachine &Target,
37 std::vector<MachineInstr*>& mvec);
39 extern bool ThisIsAChainRule (int eruleno);
42 //************************ Exported Functions ******************************/
45 //---------------------------------------------------------------------------
46 // Function: createInstructionSelectionPass
49 // Entry point for instruction selection using BURG.
50 // Return a pass that performs machine dependent instruction selection.
51 //---------------------------------------------------------------------------
53 FunctionPass *createInstructionSelectionPass(TargetMachine &Target);
56 //************************ Exported Data Types *****************************/
59 //---------------------------------------------------------------------------
60 // class TmpInstruction
62 // This class represents temporary intermediate values
63 // used within the machine code for a VM instruction
64 //---------------------------------------------------------------------------
66 class TmpInstruction : public Instruction {
67 TmpInstruction(const TmpInstruction &TI)
68 : Instruction(TI.getType(), TI.getOpcode()) {
69 if (!TI.Operands.empty()) {
70 Operands.push_back(Use(TI.Operands[0], this));
71 if (TI.Operands.size() == 2)
72 Operands.push_back(Use(TI.Operands[1], this));
74 assert(0 && "Bad # operands to TmpInstruction!");
78 // Constructor that uses the type of S1 as the type of the temporary.
79 // s1 must be a valid value. s2 may be NULL.
80 TmpInstruction(MachineCodeForInstruction& mcfi,
81 Value *s1, Value *s2 = 0, const std::string &name = "");
83 // Constructor that requires the type of the temporary to be specified.
84 // Both S1 and S2 may be NULL.
85 TmpInstruction(MachineCodeForInstruction& mcfi,
86 const Type *Ty, Value *s1 = 0, Value* s2 = 0,
87 const std::string &name = "");
89 virtual Instruction *clone() const {
90 assert(0 && "Cannot clone TmpInstructions!");
93 virtual const char *getOpcodeName() const {
94 return "TempValueForMachineInstr";
97 // Methods for support type inquiry through isa, cast, and dyn_cast:
98 static inline bool classof(const TmpInstruction *) { return true; }
99 static inline bool classof(const Instruction *I) {
100 return (I->getOpcode() == Instruction::UserOp1);
102 static inline bool classof(const Value *V) {
103 return isa<Instruction>(V) && classof(cast<Instruction>(V));
107 } // End llvm namespace