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4ee451de36
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45418 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===-- llvm/CodeGen/PhysRegTracker.h - Physical Register Tracker -*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a physical register tracker. The tracker
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// tracks physical register usage through addRegUse and
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// delRegUse. isRegAvail checks if a physical register is available or
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// not taking into consideration register aliases.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_PHYSREGTRACKER_H
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#define LLVM_CODEGEN_PHYSREGTRACKER_H
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#include "llvm/Target/MRegisterInfo.h"
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namespace llvm {
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class PhysRegTracker {
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const MRegisterInfo* mri_;
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std::vector<unsigned> regUse_;
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public:
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explicit PhysRegTracker(const MRegisterInfo& mri)
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: mri_(&mri),
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regUse_(mri_->getNumRegs(), 0) {
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}
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PhysRegTracker(const PhysRegTracker& rhs)
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: mri_(rhs.mri_),
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regUse_(rhs.regUse_) {
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}
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const PhysRegTracker& operator=(const PhysRegTracker& rhs) {
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mri_ = rhs.mri_;
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regUse_ = rhs.regUse_;
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return *this;
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}
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void addRegUse(unsigned physReg) {
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assert(MRegisterInfo::isPhysicalRegister(physReg) &&
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"should be physical register!");
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++regUse_[physReg];
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for (const unsigned* as = mri_->getAliasSet(physReg); *as; ++as)
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++regUse_[*as];
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}
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void delRegUse(unsigned physReg) {
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assert(MRegisterInfo::isPhysicalRegister(physReg) &&
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"should be physical register!");
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assert(regUse_[physReg] != 0);
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--regUse_[physReg];
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for (const unsigned* as = mri_->getAliasSet(physReg); *as; ++as) {
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assert(regUse_[*as] != 0);
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--regUse_[*as];
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}
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}
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bool isRegAvail(unsigned physReg) const {
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assert(MRegisterInfo::isPhysicalRegister(physReg) &&
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"should be physical register!");
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return regUse_[physReg] == 0;
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}
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};
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} // End llvm namespace
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#endif
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