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;
25 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);
43 //---------------------------------------------------------------------------
44 // Function: createInstructionSelectionPass
47 // Entry point for instruction selection using BURG.
48 // Return a pass that performs machine dependent instruction selection.
49 //---------------------------------------------------------------------------
51 FunctionPass *createInstructionSelectionPass(TargetMachine &Target);
55 //---------------------------------------------------------------------------
56 // class TmpInstruction
58 // This class represents temporary intermediate values
59 // used within the machine code for a VM instruction
60 //---------------------------------------------------------------------------
62 class TmpInstruction : public Instruction {
63 TmpInstruction(const TmpInstruction &TI)
64 : Instruction(TI.getType(), TI.getOpcode()) {
65 if (!TI.Operands.empty()) {
66 Operands.push_back(Use(TI.Operands[0], this));
67 if (TI.Operands.size() == 2)
68 Operands.push_back(Use(TI.Operands[1], this));
70 assert(0 && "Bad # operands to TmpInstruction!");
74 // Constructor that uses the type of S1 as the type of the temporary.
75 // s1 must be a valid value. s2 may be NULL.
76 TmpInstruction(MachineCodeForInstruction& mcfi,
77 Value *s1, Value *s2 = 0, const std::string &name = "");
79 // Constructor that uses the type of S1 as the type of the temporary,
80 // but does not require a MachineCodeForInstruction.
81 // s1 must be a valid value. s2 may be NULL.
82 TmpInstruction(Value *s1, Value *s2 = 0, const std::string &name = "");
84 // Constructor that requires the type of the temporary to be specified.
85 // Both S1 and S2 may be NULL.
86 TmpInstruction(MachineCodeForInstruction& mcfi,
87 const Type *Ty, Value *s1 = 0, Value* s2 = 0,
88 const std::string &name = "");
90 virtual Instruction *clone() const {
91 assert(0 && "Cannot clone TmpInstructions!");
94 virtual const char *getOpcodeName() const {
95 return "TempValueForMachineInstr";
98 // Methods for support type inquiry through isa, cast, and dyn_cast:
99 static inline bool classof(const TmpInstruction *) { return true; }
100 static inline bool classof(const Instruction *I) {
101 return (I->getOpcode() == Instruction::UserOp1);
103 static inline bool classof(const Value *V) {
104 return isa<Instruction>(V) && classof(cast<Instruction>(V));
108 } // End llvm namespace