<commit_before>//===-- LiveRegMatrix.cpp - Track register interference -------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the LiveRegMatrix analysis pass.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "regalloc"
#include "llvm/CodeGen/LiveRegMatrix.h"
#include "RegisterCoalescer.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/VirtRegMap.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"

using namespace llvm;

STATISTIC(NumAssigned   , "Number of registers assigned");
STATISTIC(NumUnassigned , "Number of registers unassigned");

char LiveRegMatrix::ID = 0;
INITIALIZE_PASS_BEGIN(LiveRegMatrix, "liveregmatrix",
                      "Live Register Matrix", false, false)
INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
INITIALIZE_PASS_DEPENDENCY(VirtRegMap)
INITIALIZE_PASS_END(LiveRegMatrix, "liveregmatrix",
                    "Live Register Matrix", false, false)

LiveRegMatrix::LiveRegMatrix() : MachineFunctionPass(ID),
  UserTag(0), RegMaskTag(0), RegMaskVirtReg(0) {}

void LiveRegMatrix::getAnalysisUsage(AnalysisUsage &AU) const {
  AU.setPreservesAll();
  AU.addRequiredTransitive<LiveIntervals>();
  AU.addRequiredTransitive<VirtRegMap>();
  MachineFunctionPass::getAnalysisUsage(AU);
}

bool LiveRegMatrix::runOnMachineFunction(MachineFunction &MF) {
  TRI = MF.getTarget().getRegisterInfo();
  MRI = &MF.getRegInfo();
  LIS = &getAnalysis<LiveIntervals>();
  VRM = &getAnalysis<VirtRegMap>();

  unsigned NumRegUnits = TRI->getNumRegUnits();
  if (NumRegUnits != Matrix.size())
    Queries.reset(new LiveIntervalUnion::Query[NumRegUnits]);
  Matrix.init(LIUAlloc, NumRegUnits);

  // Make sure no stale queries get reused.
  invalidateVirtRegs();
  return false;
}

void LiveRegMatrix::releaseMemory() {
  for (unsigned i = 0, e = Matrix.size(); i != e; ++i) {
    Matrix[i].clear();
    Queries[i].clear();
  }
}

void LiveRegMatrix::assign(LiveInterval &VirtReg, unsigned PhysReg) {
  DEBUG(dbgs() << "assigning " << PrintReg(VirtReg.reg, TRI)
               << " to " << PrintReg(PhysReg, TRI) << ':');
  assert(!VRM->hasPhys(VirtReg.reg) && "Duplicate VirtReg assignment");
  VRM->assignVirt2Phys(VirtReg.reg, PhysReg);
  MRI->setPhysRegUsed(PhysReg);
  for (MCRegUnitIterator Units(PhysReg, TRI); Units.isValid(); ++Units) {
    DEBUG(dbgs() << ' ' << PrintRegUnit(*Units, TRI));
    Matrix[*Units].unify(VirtReg);
  }
  ++NumAssigned;
  DEBUG(dbgs() << '\n');
}<commit_msg>This small change reduces compile time for small programs on targets that have large register files. The omission of Queries.clear() is perfectly safe because LiveIntervalUnion::Query doesn't contain any data that needs freeing and because LiveRegMatrix::runOnFunction happens to reset the OwningArrayPtr holding Queries every time it is run, so there's no need to zero out the queries either. Not having to do this for very large numbers of physregs is a noticeable constant cost reduction in compilation of small programs.<commit_after>//===-- LiveRegMatrix.cpp - Track register interference -------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the LiveRegMatrix analysis pass.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "regalloc"
#include "llvm/CodeGen/LiveRegMatrix.h"
#include "RegisterCoalescer.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/VirtRegMap.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"

using namespace llvm;

STATISTIC(NumAssigned   , "Number of registers assigned");
STATISTIC(NumUnassigned , "Number of registers unassigned");

char LiveRegMatrix::ID = 0;
INITIALIZE_PASS_BEGIN(LiveRegMatrix, "liveregmatrix",
                      "Live Register Matrix", false, false)
INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
INITIALIZE_PASS_DEPENDENCY(VirtRegMap)
INITIALIZE_PASS_END(LiveRegMatrix, "liveregmatrix",
                    "Live Register Matrix", false, false)

LiveRegMatrix::LiveRegMatrix() : MachineFunctionPass(ID),
  UserTag(0), RegMaskTag(0), RegMaskVirtReg(0) {}

void LiveRegMatrix::getAnalysisUsage(AnalysisUsage &AU) const {
  AU.setPreservesAll();
  AU.addRequiredTransitive<LiveIntervals>();
  AU.addRequiredTransitive<VirtRegMap>();
  MachineFunctionPass::getAnalysisUsage(AU);
}

bool LiveRegMatrix::runOnMachineFunction(MachineFunction &MF) {
  TRI = MF.getTarget().getRegisterInfo();
  MRI = &MF.getRegInfo();
  LIS = &getAnalysis<LiveIntervals>();
  VRM = &getAnalysis<VirtRegMap>();

  unsigned NumRegUnits = TRI->getNumRegUnits();
  if (NumRegUnits != Matrix.size())
    Queries.reset(new LiveIntervalUnion::Query[NumRegUnits]);
  Matrix.init(LIUAlloc, NumRegUnits);

  // Make sure no stale queries get reused.
  invalidateVirtRegs();
  return false;
}

void LiveRegMatrix::releaseMemory() {
  for (unsigned i = 0, e = Matrix.size(); i != e; ++i) {
    Matrix[i].clear();
    // No need to clear Queries here, since LiveIntervalUnion::Query doesn't
    // have anything important to clear and LiveRegMatrix's runOnFunction()
    // does a OwningPtr::reset anyways.
  }
}

void LiveRegMatrix::assign(LiveInterval &VirtReg, unsigned PhysReg) {
  DEBUG(dbgs() << "assigning " << PrintReg(VirtReg.reg, TRI)
               << " to " << PrintReg(PhysReg, TRI) << ':');
  assert(!VRM->hasPhys(VirtReg.reg) && "Duplicate VirtReg assignment");
  VRM->assignVirt2Phys(VirtReg.reg, PhysReg);
  MRI->setPhysRegUsed(PhysReg);
  for (MCRegUnitIterator Units(PhysReg, TRI); Units.isValid(); ++Units) {
    DEBUG(dbgs() << ' ' << PrintRegUnit(*Units, TRI));
    Matrix[*Units].unify(VirtReg);
  }
  ++NumAssigned;
  DEBUG(dbgs() << '\n');
}
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