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b4a1e4bea9
The functions must be implemented by the target-specific code generator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@951 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
3.1 KiB
C++
104 lines
3.1 KiB
C++
// $Id$ -*-c++-*-
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//***************************************************************************
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// File:
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// InstrSelection.h
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//
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// Purpose:
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// External interface to instruction selection.
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//
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// History:
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// 7/02/01 - Vikram Adve - Created
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//**************************************************************************/
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#ifndef LLVM_CODEGEN_INSTR_SELECTION_H
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#define LLVM_CODEGEN_INSTR_SELECTION_H
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#include "llvm/Instruction.h"
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class Method;
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class InstrForest;
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class MachineInstr;
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class InstructionNode;
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class TmpInstruction;
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class ConstPoolVal;
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class TargetMachine;
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/************************* Required Functions *******************************
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* Target-dependent functions that MUST be implemented for each target.
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***************************************************************************/
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const unsigned MAX_INSTR_PER_VMINSTR = 8;
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const Instruction::OtherOps TMP_INSTRUCTION_OPCODE = Instruction::UserOp1;
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extern unsigned GetInstructionsByRule (InstructionNode* subtreeRoot,
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int ruleForNode,
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short* nts,
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TargetMachine &Target,
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MachineInstr** minstrVec);
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extern unsigned GetInstructionsForProlog(BasicBlock* entryBB,
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TargetMachine &Target,
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MachineInstr** minstrVec);
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extern unsigned GetInstructionsForEpilog(BasicBlock* anExitBB,
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TargetMachine &Target,
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MachineInstr** minstrVec);
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extern bool ThisIsAChainRule (int eruleno);
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//************************ Exported Functions ******************************/
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//---------------------------------------------------------------------------
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// Function: SelectInstructionsForMethod
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//
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// Purpose:
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// Entry point for instruction selection using BURG.
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// Returns true if instruction selection failed, false otherwise.
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// Implemented in machine-specific instruction selection file.
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//---------------------------------------------------------------------------
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bool SelectInstructionsForMethod (Method* method,
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TargetMachine &Target);
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//************************ Exported Data Types *****************************/
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//---------------------------------------------------------------------------
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// class TmpInstruction
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//
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// This class represents temporary intermediate values
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// used within the machine code for a VM instruction
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//---------------------------------------------------------------------------
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class TmpInstruction : public Instruction {
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TmpInstruction (const TmpInstruction &CI) : Instruction(CI.getType(), CI.getOpcode()) {
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Operands.reserve(2);
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Operands.push_back(Use(Operands[0], this));
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Operands.push_back(Use(Operands[1], this));
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}
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public:
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TmpInstruction(OtherOps Opcode, Value *S1, Value* S2, const string &Name = "")
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: Instruction(S1->getType(), Opcode, Name)
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{
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assert(Opcode == TMP_INSTRUCTION_OPCODE &&
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"Tmp instruction opcode invalid!");
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Operands.reserve(S2? 2 : 1);
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Operands.push_back(Use(S1, this));
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if (S2)
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Operands.push_back(Use(S2, this));
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}
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virtual Instruction *clone() const { return new TmpInstruction(*this); }
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virtual const char *getOpcodeName() const {
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return "userOp1";
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}
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};
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//**************************************************************************/
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#endif
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