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"
22 class InstructionNode;
24 class MachineCodeForInstruction;
27 //===--------------------- Required Functions ---------------------------------
28 // Target-dependent functions that MUST be implemented for each target.
31 extern void GetInstructionsByRule (InstructionNode* subtreeRoot,
34 TargetMachine &Target,
35 std::vector<MachineInstr*>& mvec);
37 extern bool ThisIsAChainRule (int eruleno);
40 //************************ Exported Functions ******************************/
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);
54 //************************ Exported Data Types *****************************/
57 //---------------------------------------------------------------------------
58 // class TmpInstruction
60 // This class represents temporary intermediate values
61 // used within the machine code for a VM instruction
62 //---------------------------------------------------------------------------
64 class TmpInstruction : public Instruction {
65 TmpInstruction(const TmpInstruction &TI)
66 : Instruction(TI.getType(), TI.getOpcode()) {
67 if (!TI.Operands.empty()) {
68 Operands.push_back(Use(TI.Operands[0], this));
69 if (TI.Operands.size() == 2)
70 Operands.push_back(Use(TI.Operands[1], this));
72 assert(0 && "Bad # operands to TmpInstruction!");
76 // Constructor that uses the type of S1 as the type of the temporary.
77 // s1 must be a valid value. s2 may be NULL.
78 TmpInstruction(MachineCodeForInstruction& mcfi,
79 Value *s1, Value *s2 = 0, const std::string &name = "");
81 // Constructor that requires the type of the temporary to be specified.
82 // Both S1 and S2 may be NULL.
83 TmpInstruction(MachineCodeForInstruction& mcfi,
84 const Type *Ty, Value *s1 = 0, Value* s2 = 0,
85 const std::string &name = "");
87 virtual Instruction *clone() const {
88 assert(0 && "Cannot clone TmpInstructions!");
91 virtual const char *getOpcodeName() const {
92 return "TempValueForMachineInstr";
95 // Methods for support type inquiry through isa, cast, and dyn_cast:
96 static inline bool classof(const TmpInstruction *) { return true; }
97 static inline bool classof(const Instruction *I) {
98 return (I->getOpcode() == Instruction::UserOp1);
100 static inline bool classof(const Value *V) {
101 return isa<Instruction>(V) && classof(cast<Instruction>(V));