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 IntrinsicLowering;
26 class MachineCodeForInstruction;
30 //===--------------------- Required Functions ---------------------------------
31 // Target-dependent functions that MUST be implemented for each target.
34 extern void GetInstructionsByRule (InstructionNode* subtreeRoot,
37 TargetMachine &Target,
38 std::vector<MachineInstr*>& mvec);
40 extern bool ThisIsAChainRule (int eruleno);
43 //************************ Exported Functions ******************************/
46 //---------------------------------------------------------------------------
47 // Function: createInstructionSelectionPass
50 // Entry point for instruction selection using BURG.
51 // Return a pass that performs machine dependent instruction selection.
52 //---------------------------------------------------------------------------
54 FunctionPass *createInstructionSelectionPass(TargetMachine &Target,
55 IntrinsicLowering &IL);
58 //************************ Exported Data Types *****************************/
61 //---------------------------------------------------------------------------
62 // class TmpInstruction
64 // This class represents temporary intermediate values
65 // used within the machine code for a VM instruction
66 //---------------------------------------------------------------------------
68 class TmpInstruction : public Instruction {
69 TmpInstruction(const TmpInstruction &TI)
70 : Instruction(TI.getType(), TI.getOpcode()) {
71 if (!TI.Operands.empty()) {
72 Operands.push_back(Use(TI.Operands[0], this));
73 if (TI.Operands.size() == 2)
74 Operands.push_back(Use(TI.Operands[1], this));
76 assert(0 && "Bad # operands to TmpInstruction!");
80 // Constructor that uses the type of S1 as the type of the temporary.
81 // s1 must be a valid value. s2 may be NULL.
82 TmpInstruction(MachineCodeForInstruction& mcfi,
83 Value *s1, Value *s2 = 0, const std::string &name = "");
85 // Constructor that requires the type of the temporary to be specified.
86 // Both S1 and S2 may be NULL.
87 TmpInstruction(MachineCodeForInstruction& mcfi,
88 const Type *Ty, Value *s1 = 0, Value* s2 = 0,
89 const std::string &name = "");
91 virtual Instruction *clone() const {
92 assert(0 && "Cannot clone TmpInstructions!");
95 virtual const char *getOpcodeName() const {
96 return "TempValueForMachineInstr";
99 // Methods for support type inquiry through isa, cast, and dyn_cast:
100 static inline bool classof(const TmpInstruction *) { return true; }
101 static inline bool classof(const Instruction *I) {
102 return (I->getOpcode() == Instruction::UserOp1);
104 static inline bool classof(const Value *V) {
105 return isa<Instruction>(V) && classof(cast<Instruction>(V));
109 } // End llvm namespace