//
// 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/Target/TargetRegisterInfo.h"
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/IndexedMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Support/Streams.h"
#include <map>
namespace llvm {
class MachineInstr;
+ class MachineFunction;
+ class TargetInstrInfo;
class VirtRegMap {
public:
+ enum {
+ NO_PHYS_REG = 0,
+ NO_STACK_SLOT = (1L << 30)-1,
+ MAX_STACK_SLOT = (1L << 18)-1
+ };
+
enum ModRef { isRef = 1, isMod = 2, isModRef = 3 };
typedef std::multimap<MachineInstr*,
std::pair<unsigned, ModRef> > MI2VirtMapTy;
private:
+ const TargetInstrInfo &TII;
+
MachineFunction &MF;
/// Virt2PhysMap - This is a virtual to physical register
/// mapping. Each virtual register is required to have an entry in
/// it; even spilled virtual registers (the register mapped to a
/// spilled register is the temporary used to load it from the
/// stack).
- DenseMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
+ IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
+
/// Virt2StackSlotMap - This is virtual register to stack slot
/// mapping. Each spilled virtual register has an entry in it
/// which corresponds to the stack slot this register is spilled
/// at.
- DenseMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
+ IndexedMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
+
+ /// Virt2StackSlotMap - 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;
+
+ /// Virt2SplitMap - This is virtual register to splitted virtual register
+ /// 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.
+ IndexedMap<MachineInstr*, VirtReg2IndexFunctor> ReMatMap;
+
/// MI2VirtMap - This is MachineInstr to virtual register
/// mapping. In the case of memory spill code being folded into
/// instructions, we need to know which virtual register was
/// read/written by this instruction.
MI2VirtMapTy MI2VirtMap;
-
+
+ /// SpillPt2VirtMap - This records the virtual registers which should
+ /// be spilled right after the MachineInstr due to live interval
+ /// splitting.
+ 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;
+
+ /// ReMatId - Instead of assigning a stack slot to a to be rematerialized
+ /// virtual register, an unique id is being assigned. This keeps track of
+ /// the highest id used so far. Note, this starts at (1<<18) to avoid
+ /// 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;
+
VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
- enum {
- NO_PHYS_REG = 0,
- NO_STACK_SLOT = ~0 >> 1
- };
-
public:
- VirtRegMap(MachineFunction &mf)
- : MF(mf), Virt2PhysMap(NO_PHYS_REG), Virt2StackSlotMap(NO_STACK_SLOT) {
- grow();
- }
+ explicit VirtRegMap(MachineFunction &mf);
void grow();
/// @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;
grow();
}
- /// @brief returns true is the specified virtual register is
- /// mapped to a stack slot
- bool hasStackSlot(unsigned virtReg) const {
- return getStackSlot(virtReg) != NO_STACK_SLOT;
+ /// @brief records virtReg is a split live interval from SReg.
+ void setIsSplitFromReg(unsigned virtReg, unsigned SReg) {
+ Virt2SplitMap[virtReg] = SReg;
+ }
+
+ /// @brief returns the live interval virtReg is split from.
+ unsigned getPreSplitReg(unsigned virtReg) {
+ return Virt2SplitMap[virtReg];
+ }
+
+ /// @brief returns true is the specified virtual register is not
+ /// mapped to a stack slot or rematerialized.
+ bool isAssignedReg(unsigned virtReg) const {
+ if (getStackSlot(virtReg) == NO_STACK_SLOT &&
+ getReMatId(virtReg) == NO_STACK_SLOT)
+ return true;
+ // Split register can be assigned a physical register as well as a
+ // stack slot or remat id.
+ return (Virt2SplitMap[virtReg] && Virt2PhysMap[virtReg] != NO_PHYS_REG);
}
/// @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(TargetRegisterInfo::isVirtualRegister(virtReg));
+ return Virt2ReMatIdMap[virtReg];
+ }
+
/// @brief create a mapping for the specifed virtual register to
/// the next available stack slot
int assignVirt2StackSlot(unsigned virtReg);
/// the specified stack slot
void assignVirt2StackSlot(unsigned virtReg, int frameIndex);
+ /// @brief assign an unique re-materialization id to the specified
+ /// virtual register.
+ int assignVirtReMatId(unsigned virtReg);
+ /// @brief assign an unique re-materialization id to the specified
+ /// virtual register.
+ void assignVirtReMatId(unsigned virtReg, int id);
+
+ /// @brief returns true if the specified virtual register is being
+ /// re-materialized.
+ bool isReMaterialized(unsigned virtReg) const {
+ return ReMatMap[virtReg] != NULL;
+ }
+
+ /// @brief returns the original machine instruction being re-issued
+ /// to re-materialize the specified virtual register.
+ MachineInstr *getReMaterializedMI(unsigned virtReg) const {
+ return ReMatMap[virtReg];
+ }
+
+ /// @brief records the specified virtual register will be
+ /// re-materialized and the original instruction which will be re-issed
+ /// for this purpose. If parameter all is true, then all uses of the
+ /// registers are rematerialized and it's safe to delete the definition.
+ void setVirtIsReMaterialized(unsigned virtReg, MachineInstr *def) {
+ 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<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, bool isKill, MachineInstr *Pt) {
+ if (SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end())
+ SpillPt2VirtMap[Pt].push_back(std::make_pair(virtReg, isKill));
+ else {
+ std::vector<std::pair<unsigned,bool> > Virts;
+ Virts.push_back(std::make_pair(virtReg, isKill));
+ SpillPt2VirtMap.insert(std::make_pair(Pt, Virts));
+ }
+ }
+
+ void transferSpillPts(MachineInstr *Old, MachineInstr *New) {
+ 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().first;
+ bool isKill = I->second.back().second;
+ I->second.pop_back();
+ 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));
+ }
+ }
+
+ 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 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 Updates information about the specified virtual register's value
+ /// 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 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 the specified machine instruction.
+ void virtFolded(unsigned VirtReg, MachineInstr *MI, ModRef MRInfo);
/// @brief returns the virtual registers' values folded in memory
/// operands of this instruction
getFoldedVirts(MachineInstr* MI) const {
return MI2VirtMap.equal_range(MI);
}
+
+ /// RemoveMachineInstrFromMaps - MI is being erased, remove it from the
+ /// the folded instruction map and spill point map.
+ void RemoveMachineInstrFromMaps(MachineInstr *MI);
void print(std::ostream &OS) const;
+ void print(std::ostream *OS) const { if (OS) print(*OS); }
void dump() const;
};
+ inline std::ostream *operator<<(std::ostream *OS, const VirtRegMap &VRM) {
+ VRM.print(OS);
+ return OS;
+ }
inline std::ostream &operator<<(std::ostream &OS, const VirtRegMap &VRM) {
VRM.print(OS);
return OS;
struct Spiller {
virtual ~Spiller();
virtual bool runOnMachineFunction(MachineFunction &MF,
- const VirtRegMap &VRM) = 0;
+ VirtRegMap &VRM) = 0;
};
/// createSpiller - Create an return a spiller object, as specified on the
projects / oota-llvm.git / blobdiff