//===-- llvm/CodeGen/PhysRegTracker.h - Physical Register Tracker -*- C++ -*-=// // // The LLVM Compiler Infrastructure // // This file was developed by the LLVM research group and is distributed under // the University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements a physical register tracker. The tracker // tracks physical register usage through addRegUse and // delRegUse. isRegAvail checks if a physical register is available or // not taking into consideration register aliases. // //===----------------------------------------------------------------------===// #ifndef LLVM_CODEGEN_PHYSREGTRACKER_H #define LLVM_CODEGEN_PHYSREGTRACKER_H #include "llvm/Target/MRegisterInfo.h" namespace llvm { class PhysRegTracker { const MRegisterInfo* mri_; std::vector<unsigned> regUse_; public: PhysRegTracker(const MRegisterInfo& mri) : mri_(&mri), regUse_(mri_->getNumRegs(), 0) { } PhysRegTracker(const PhysRegTracker& rhs) : mri_(rhs.mri_), regUse_(rhs.regUse_) { } const PhysRegTracker& operator=(const PhysRegTracker& rhs) { mri_ = rhs.mri_; regUse_ = rhs.regUse_; return *this; } void addRegUse(unsigned physReg) { assert(MRegisterInfo::isPhysicalRegister(physReg) && "should be physical register!"); ++regUse_[physReg]; for (const unsigned* as = mri_->getAliasSet(physReg); *as; ++as) ++regUse_[*as]; } void delRegUse(unsigned physReg) { assert(MRegisterInfo::isPhysicalRegister(physReg) && "should be physical register!"); assert(regUse_[physReg] != 0); --regUse_[physReg]; for (const unsigned* as = mri_->getAliasSet(physReg); *as; ++as) { assert(regUse_[*as] != 0); --regUse_[*as]; } } bool isRegAvail(unsigned physReg) const { assert(MRegisterInfo::isPhysicalRegister(physReg) && "should be physical register!"); return regUse_[physReg] == 0; } }; } // End llvm namespace #endif