#define DEBUG_TYPE "virtregmap"
#include "VirtRegMap.h"
#include "llvm/Function.h"
+#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DepthFirstIterator.h"
// VirtRegMap implementation
//===----------------------------------------------------------------------===//
-VirtRegMap::VirtRegMap(MachineFunction &mf)
- : TII(*mf.getTarget().getInstrInfo()), MF(mf),
- Virt2PhysMap(NO_PHYS_REG), Virt2StackSlotMap(NO_STACK_SLOT),
- Virt2ReMatIdMap(NO_STACK_SLOT), Virt2SplitMap(0),
- Virt2SplitKillMap(0), ReMatMap(NULL), ReMatId(MAX_STACK_SLOT+1),
- LowSpillSlot(NO_STACK_SLOT), HighSpillSlot(NO_STACK_SLOT) {
+char VirtRegMap::ID = 0;
+
+static RegisterPass<VirtRegMap>
+X("virtregmap", "Virtual Register Map");
+
+bool VirtRegMap::runOnMachineFunction(MachineFunction &mf) {
+ MRI = &mf.getRegInfo();
+ TII = mf.getTarget().getInstrInfo();
+ TRI = mf.getTarget().getRegisterInfo();
+ MF = &mf;
+
+ ReMatId = MAX_STACK_SLOT+1;
+ LowSpillSlot = HighSpillSlot = NO_STACK_SLOT;
+
+ Virt2PhysMap.clear();
+ Virt2StackSlotMap.clear();
+ Virt2ReMatIdMap.clear();
+ Virt2SplitMap.clear();
+ Virt2SplitKillMap.clear();
+ ReMatMap.clear();
+ ImplicitDefed.clear();
+ SpillSlotToUsesMap.clear();
+ MI2VirtMap.clear();
+ SpillPt2VirtMap.clear();
+ RestorePt2VirtMap.clear();
+ EmergencySpillMap.clear();
+ EmergencySpillSlots.clear();
+
SpillSlotToUsesMap.resize(8);
- ImplicitDefed.resize(MF.getRegInfo().getLastVirtReg()+1-
+ ImplicitDefed.resize(MF->getRegInfo().getLastVirtReg()+1-
TargetRegisterInfo::FirstVirtualRegister);
+
+ allocatableRCRegs.clear();
+ for (TargetRegisterInfo::regclass_iterator I = TRI->regclass_begin(),
+ E = TRI->regclass_end(); I != E; ++I)
+ allocatableRCRegs.insert(std::make_pair(*I,
+ TRI->getAllocatableSet(mf, *I)));
+
grow();
+
+ return false;
}
void VirtRegMap::grow() {
- unsigned LastVirtReg = MF.getRegInfo().getLastVirtReg();
+ unsigned LastVirtReg = MF->getRegInfo().getLastVirtReg();
Virt2PhysMap.grow(LastVirtReg);
Virt2StackSlotMap.grow(LastVirtReg);
Virt2ReMatIdMap.grow(LastVirtReg);
ImplicitDefed.resize(LastVirtReg-TargetRegisterInfo::FirstVirtualRegister+1);
}
+unsigned VirtRegMap::getRegAllocPref(unsigned virtReg) {
+ std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(virtReg);
+ unsigned physReg = Hint.second;
+ if (physReg &&
+ TargetRegisterInfo::isVirtualRegister(physReg) && hasPhys(physReg))
+ physReg = getPhys(physReg);
+ if (Hint.first == 0)
+ return (physReg && TargetRegisterInfo::isPhysicalRegister(physReg))
+ ? physReg : 0;
+ return TRI->ResolveRegAllocHint(Hint.first, physReg, *MF);
+}
+
int VirtRegMap::assignVirt2StackSlot(unsigned virtReg) {
assert(TargetRegisterInfo::isVirtualRegister(virtReg));
assert(Virt2StackSlotMap[virtReg] == NO_STACK_SLOT &&
"attempt to assign stack slot to already spilled register");
- const TargetRegisterClass* RC = MF.getRegInfo().getRegClass(virtReg);
- int SS = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
+ const TargetRegisterClass* RC = MF->getRegInfo().getRegClass(virtReg);
+ int SS = MF->getFrameInfo()->CreateStackObject(RC->getSize(),
RC->getAlignment());
if (LowSpillSlot == NO_STACK_SLOT)
LowSpillSlot = SS;
assert(Virt2StackSlotMap[virtReg] == NO_STACK_SLOT &&
"attempt to assign stack slot to already spilled register");
assert((SS >= 0 ||
- (SS >= MF.getFrameInfo()->getObjectIndexBegin())) &&
+ (SS >= MF->getFrameInfo()->getObjectIndexBegin())) &&
"illegal fixed frame index");
Virt2StackSlotMap[virtReg] = SS;
}
EmergencySpillSlots.find(RC);
if (I != EmergencySpillSlots.end())
return I->second;
- int SS = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
+ int SS = MF->getFrameInfo()->CreateStackObject(RC->getSize(),
RC->getAlignment());
if (LowSpillSlot == NO_STACK_SLOT)
LowSpillSlot = SS;
}
void VirtRegMap::addSpillSlotUse(int FI, MachineInstr *MI) {
- if (!MF.getFrameInfo()->isFixedObjectIndex(FI)) {
+ if (!MF->getFrameInfo()->isFixedObjectIndex(FI)) {
// If FI < LowSpillSlot, this stack reference was produced by
// instruction selection and is not a spill
if (FI >= LowSpillSlot) {
if (!MO.isFI())
continue;
int FI = MO.getIndex();
- if (MF.getFrameInfo()->isFixedObjectIndex(FI))
+ if (MF->getFrameInfo()->isFixedObjectIndex(FI))
continue;
// This stack reference was produced by instruction selection and
// is not a spill
EmergencySpillMap.erase(MI);
}
-void VirtRegMap::print(std::ostream &OS) const {
- const TargetRegisterInfo* TRI = MF.getTarget().getRegisterInfo();
+/// FindUnusedRegisters - Gather a list of allocatable registers that
+/// have not been allocated to any virtual register.
+bool VirtRegMap::FindUnusedRegisters(LiveIntervals* LIs) {
+ unsigned NumRegs = TRI->getNumRegs();
+ UnusedRegs.reset();
+ UnusedRegs.resize(NumRegs);
+
+ BitVector Used(NumRegs);
+ for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
+ e = MF->getRegInfo().getLastVirtReg(); i <= e; ++i)
+ if (Virt2PhysMap[i] != (unsigned)VirtRegMap::NO_PHYS_REG)
+ Used.set(Virt2PhysMap[i]);
+
+ BitVector Allocatable = TRI->getAllocatableSet(*MF);
+ bool AnyUnused = false;
+ for (unsigned Reg = 1; Reg < NumRegs; ++Reg) {
+ if (Allocatable[Reg] && !Used[Reg] && !LIs->hasInterval(Reg)) {
+ bool ReallyUnused = true;
+ for (const unsigned *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
+ if (Used[*AS] || LIs->hasInterval(*AS)) {
+ ReallyUnused = false;
+ break;
+ }
+ }
+ if (ReallyUnused) {
+ AnyUnused = true;
+ UnusedRegs.set(Reg);
+ }
+ }
+ }
+
+ return AnyUnused;
+}
+
+void VirtRegMap::print(std::ostream &OS, const Module* M) const {
+ raw_os_ostream RawOS(OS);
+ print(RawOS, M);
+}
+
+void VirtRegMap::print(raw_ostream &OS, const Module* M) const {
+ const TargetRegisterInfo* TRI = MF->getTarget().getRegisterInfo();
OS << "********** REGISTER MAP **********\n";
for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
- e = MF.getRegInfo().getLastVirtReg(); i <= e; ++i) {
+ e = MF->getRegInfo().getLastVirtReg(); i <= e; ++i) {
if (Virt2PhysMap[i] != (unsigned)VirtRegMap::NO_PHYS_REG)
OS << "[reg" << i << " -> " << TRI->getName(Virt2PhysMap[i])
<< "]\n";
}
for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
- e = MF.getRegInfo().getLastVirtReg(); i <= e; ++i)
+ e = MF->getRegInfo().getLastVirtReg(); i <= e; ++i)
if (Virt2StackSlotMap[i] != VirtRegMap::NO_STACK_SLOT)
OS << "[reg" << i << " -> fi#" << Virt2StackSlotMap[i] << "]\n";
OS << '\n';
void VirtRegMap::dump() const {
print(cerr);
-}
\ No newline at end of file
+}
projects / oota-llvm.git / blobdiff