//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#ifndef LLVM_CODEGEN_VIRTREGMAP_H
#define LLVM_CODEGEN_VIRTREGMAP_H
-#include "llvm/Target/MRegisterInfo.h"
-#include "llvm/ADT/DenseMap.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/IndexedMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/Streams.h"
#include <map>
/// at.
IndexedMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
- /// Virt2StackSlotMap - This is virtual register to rematerialization id
+ /// Virt2ReMatIdMap - This is virtual register to rematerialization id
/// mapping. Each spilled virtual register that should be remat'd has an
/// entry in it which corresponds to the remat id.
IndexedMap<int, VirtReg2IndexFunctor> Virt2ReMatIdMap;
/// mapping.
IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2SplitMap;
+ /// Virt2SplitKillMap - This is splitted virtual register to its last use
+ /// (kill) index mapping.
+ IndexedMap<unsigned> Virt2SplitKillMap;
+
/// ReMatMap - This is virtual register to re-materialized instruction
/// mapping. Each virtual register whose definition is going to be
/// re-materialized has an entry in it.
/// SpillPt2VirtMap - This records the virtual registers which should
/// be spilled right after the MachineInstr due to live interval
/// splitting.
- std::map<MachineInstr*, std::vector<unsigned> > SpillPt2VirtMap;
+ std::map<MachineInstr*, std::vector<std::pair<unsigned,bool> > >
+ SpillPt2VirtMap;
+
+ /// RestorePt2VirtMap - This records the virtual registers which should
+ /// be restored right before the MachineInstr due to live interval
+ /// splitting.
+ std::map<MachineInstr*, std::vector<unsigned> > RestorePt2VirtMap;
+
+ /// EmergencySpillMap - This records the physical registers that should
+ /// be spilled / restored around the MachineInstr since the register
+ /// allocator has run out of registers.
+ std::map<MachineInstr*, std::vector<unsigned> > EmergencySpillMap;
+
+ /// EmergencySpillSlots - This records emergency spill slots used to
+ /// spill physical registers when the register allocator runs out of
+ /// registers. Ideally only one stack slot is used per function per
+ /// register class.
+ std::map<const TargetRegisterClass*, int> EmergencySpillSlots;
/// ReMatId - Instead of assigning a stack slot to a to be rematerialized
/// virtual register, an unique id is being assigned. This keeps track of
/// conflicts with stack slot numbers.
int ReMatId;
+ /// LowSpillSlot, HighSpillSlot - Lowest and highest spill slot indexes.
+ int LowSpillSlot, HighSpillSlot;
+
+ /// SpillSlotToUsesMap - Records uses for each register spill slot.
+ SmallVector<SmallPtrSet<MachineInstr*, 4>, 8> SpillSlotToUsesMap;
+
+ /// ImplicitDefed - One bit for each virtual register. If set it indicates
+ /// the register is implicitly defined.
+ BitVector ImplicitDefed;
+
VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
/// @brief returns the physical register mapped to the specified
/// virtual register
unsigned getPhys(unsigned virtReg) const {
- assert(MRegisterInfo::isVirtualRegister(virtReg));
+ assert(TargetRegisterInfo::isVirtualRegister(virtReg));
return Virt2PhysMap[virtReg];
}
/// @brief creates a mapping for the specified virtual register to
/// the specified physical register
void assignVirt2Phys(unsigned virtReg, unsigned physReg) {
- assert(MRegisterInfo::isVirtualRegister(virtReg) &&
- MRegisterInfo::isPhysicalRegister(physReg));
+ assert(TargetRegisterInfo::isVirtualRegister(virtReg) &&
+ TargetRegisterInfo::isPhysicalRegister(physReg));
assert(Virt2PhysMap[virtReg] == NO_PHYS_REG &&
"attempt to assign physical register to already mapped "
"virtual register");
/// @brief clears the specified virtual register's, physical
/// register mapping
void clearVirt(unsigned virtReg) {
- assert(MRegisterInfo::isVirtualRegister(virtReg));
+ assert(TargetRegisterInfo::isVirtualRegister(virtReg));
assert(Virt2PhysMap[virtReg] != NO_PHYS_REG &&
"attempt to clear a not assigned virtual register");
Virt2PhysMap[virtReg] = NO_PHYS_REG;
return Virt2SplitMap[virtReg];
}
- /// @brief returns true is the specified virtual register is not
+ /// @brief returns true if the specified virtual register is not
/// mapped to a stack slot or rematerialized.
bool isAssignedReg(unsigned virtReg) const {
if (getStackSlot(virtReg) == NO_STACK_SLOT &&
/// @brief returns the stack slot mapped to the specified virtual
/// register
int getStackSlot(unsigned virtReg) const {
- assert(MRegisterInfo::isVirtualRegister(virtReg));
+ assert(TargetRegisterInfo::isVirtualRegister(virtReg));
return Virt2StackSlotMap[virtReg];
}
/// @brief returns the rematerialization id mapped to the specified virtual
/// register
int getReMatId(unsigned virtReg) const {
- assert(MRegisterInfo::isVirtualRegister(virtReg));
+ assert(TargetRegisterInfo::isVirtualRegister(virtReg));
return Virt2ReMatIdMap[virtReg];
}
ReMatMap[virtReg] = def;
}
+ /// @brief record the last use (kill) of a split virtual register.
+ void addKillPoint(unsigned virtReg, unsigned index) {
+ Virt2SplitKillMap[virtReg] = index;
+ }
+
+ unsigned getKillPoint(unsigned virtReg) const {
+ return Virt2SplitKillMap[virtReg];
+ }
+
+ /// @brief remove the last use (kill) of a split virtual register.
+ void removeKillPoint(unsigned virtReg) {
+ Virt2SplitKillMap[virtReg] = 0;
+ }
+
/// @brief returns true if the specified MachineInstr is a spill point.
bool isSpillPt(MachineInstr *Pt) const {
return SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end();
/// @brief returns the virtual registers that should be spilled due to
/// splitting right after the specified MachineInstr.
- std::vector<unsigned> &getSpillPtSpills(MachineInstr *Pt) {
+ std::vector<std::pair<unsigned,bool> > &getSpillPtSpills(MachineInstr *Pt) {
return SpillPt2VirtMap[Pt];
}
/// @brief records the specified MachineInstr as a spill point for virtReg.
- void addSpillPoint(unsigned virtReg, MachineInstr *Pt) {
+ void addSpillPoint(unsigned virtReg, bool isKill, MachineInstr *Pt) {
if (SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end())
- SpillPt2VirtMap[Pt].push_back(virtReg);
+ SpillPt2VirtMap[Pt].push_back(std::make_pair(virtReg, isKill));
else {
- std::vector<unsigned> Virts;
- Virts.push_back(virtReg);
+ std::vector<std::pair<unsigned,bool> > Virts;
+ Virts.push_back(std::make_pair(virtReg, isKill));
SpillPt2VirtMap.insert(std::make_pair(Pt, Virts));
}
}
+ /// @brief - transfer spill point information from one instruction to
+ /// another.
void transferSpillPts(MachineInstr *Old, MachineInstr *New) {
- std::map<MachineInstr*,std::vector<unsigned> >::iterator I =
- SpillPt2VirtMap.find(Old);
+ std::map<MachineInstr*,std::vector<std::pair<unsigned,bool> > >::iterator
+ I = SpillPt2VirtMap.find(Old);
if (I == SpillPt2VirtMap.end())
return;
while (!I->second.empty()) {
- unsigned virtReg = I->second.back();
+ unsigned virtReg = I->second.back().first;
+ bool isKill = I->second.back().second;
I->second.pop_back();
- addSpillPoint(virtReg, New);
+ addSpillPoint(virtReg, isKill, New);
}
SpillPt2VirtMap.erase(I);
}
+ /// @brief returns true if the specified MachineInstr is a restore point.
+ bool isRestorePt(MachineInstr *Pt) const {
+ return RestorePt2VirtMap.find(Pt) != RestorePt2VirtMap.end();
+ }
+
+ /// @brief returns the virtual registers that should be restoreed due to
+ /// splitting right after the specified MachineInstr.
+ std::vector<unsigned> &getRestorePtRestores(MachineInstr *Pt) {
+ return RestorePt2VirtMap[Pt];
+ }
+
+ /// @brief records the specified MachineInstr as a restore point for virtReg.
+ void addRestorePoint(unsigned virtReg, MachineInstr *Pt) {
+ if (RestorePt2VirtMap.find(Pt) != RestorePt2VirtMap.end())
+ RestorePt2VirtMap[Pt].push_back(virtReg);
+ else {
+ std::vector<unsigned> Virts;
+ Virts.push_back(virtReg);
+ RestorePt2VirtMap.insert(std::make_pair(Pt, Virts));
+ }
+ }
+
+ /// @brief - transfer restore point information from one instruction to
+ /// another.
+ void transferRestorePts(MachineInstr *Old, MachineInstr *New) {
+ std::map<MachineInstr*,std::vector<unsigned> >::iterator I =
+ RestorePt2VirtMap.find(Old);
+ if (I == RestorePt2VirtMap.end())
+ return;
+ while (!I->second.empty()) {
+ unsigned virtReg = I->second.back();
+ I->second.pop_back();
+ addRestorePoint(virtReg, New);
+ }
+ RestorePt2VirtMap.erase(I);
+ }
+
+ /// @brief records that the specified physical register must be spilled
+ /// around the specified machine instr.
+ void addEmergencySpill(unsigned PhysReg, MachineInstr *MI) {
+ if (EmergencySpillMap.find(MI) != EmergencySpillMap.end())
+ EmergencySpillMap[MI].push_back(PhysReg);
+ else {
+ std::vector<unsigned> PhysRegs;
+ PhysRegs.push_back(PhysReg);
+ EmergencySpillMap.insert(std::make_pair(MI, PhysRegs));
+ }
+ }
+
+ /// @brief returns true if one or more physical registers must be spilled
+ /// around the specified instruction.
+ bool hasEmergencySpills(MachineInstr *MI) const {
+ return EmergencySpillMap.find(MI) != EmergencySpillMap.end();
+ }
+
+ /// @brief returns the physical registers to be spilled and restored around
+ /// the instruction.
+ std::vector<unsigned> &getEmergencySpills(MachineInstr *MI) {
+ return EmergencySpillMap[MI];
+ }
+
+ /// @brief - transfer emergency spill information from one instruction to
+ /// another.
+ void transferEmergencySpills(MachineInstr *Old, MachineInstr *New) {
+ std::map<MachineInstr*,std::vector<unsigned> >::iterator I =
+ EmergencySpillMap.find(Old);
+ if (I == EmergencySpillMap.end())
+ return;
+ while (!I->second.empty()) {
+ unsigned virtReg = I->second.back();
+ I->second.pop_back();
+ addEmergencySpill(virtReg, New);
+ }
+ EmergencySpillMap.erase(I);
+ }
+
+ /// @brief return or get a emergency spill slot for the register class.
+ int getEmergencySpillSlot(const TargetRegisterClass *RC);
+
+ /// @brief Return lowest spill slot index.
+ int getLowSpillSlot() const {
+ return LowSpillSlot;
+ }
+
+ /// @brief Return highest spill slot index.
+ int getHighSpillSlot() const {
+ return HighSpillSlot;
+ }
+
+ /// @brief Records a spill slot use.
+ void addSpillSlotUse(int FrameIndex, MachineInstr *MI);
+
+ /// @brief Returns true if spill slot has been used.
+ bool isSpillSlotUsed(int FrameIndex) const {
+ assert(FrameIndex >= 0 && "Spill slot index should not be negative!");
+ return !SpillSlotToUsesMap[FrameIndex-LowSpillSlot].empty();
+ }
+
+ /// @brief Mark the specified register as being implicitly defined.
+ void setIsImplicitlyDefined(unsigned VirtReg) {
+ ImplicitDefed.set(VirtReg-TargetRegisterInfo::FirstVirtualRegister);
+ }
+
+ /// @brief Returns true if the virtual register is implicitly defined.
+ bool isImplicitlyDefined(unsigned VirtReg) const {
+ return ImplicitDefed[VirtReg-TargetRegisterInfo::FirstVirtualRegister];
+ }
+
/// @brief Updates information about the specified virtual register's value
- /// folded into newMI machine instruction. The OpNum argument indicates the
- /// operand number of OldMI that is folded.
- void virtFolded(unsigned VirtReg, MachineInstr *OldMI, unsigned OpNum,
- MachineInstr *NewMI);
+ /// folded into newMI machine instruction.
+ void virtFolded(unsigned VirtReg, MachineInstr *OldMI, MachineInstr *NewMI,
+ ModRef MRInfo);
/// @brief Updates information about the specified virtual register's value
/// folded into the specified machine instruction.
/// RemoveMachineInstrFromMaps - MI is being erased, remove it from the
/// the folded instruction map and spill point map.
- void RemoveMachineInstrFromMaps(MachineInstr *MI) {
- MI2VirtMap.erase(MI);
- SpillPt2VirtMap.erase(MI);
- }
+ void RemoveMachineInstrFromMaps(MachineInstr *MI);
void print(std::ostream &OS) const;
void print(std::ostream *OS) const { if (OS) print(*OS); }
projects / oota-llvm.git / blobdiff