mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-17 21:29:20 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44428 91177308-0d34-0410-b5e6-96231b3b80d8
336 lines
12 KiB
C++
336 lines
12 KiB
C++
//===-- llvm/CodeGen/VirtRegMap.h - Virtual Register Map -*- C++ -*--------===//
|
|
//
|
|
// 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 implements a virtual register map. This maps virtual registers to
|
|
// physical registers and virtual registers to stack slots. It is created and
|
|
// updated by a register allocator and then used by a machine code rewriter that
|
|
// adds spill code and rewrites virtual into physical register references.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_VIRTREGMAP_H
|
|
#define LLVM_CODEGEN_VIRTREGMAP_H
|
|
|
|
#include "llvm/Target/MRegisterInfo.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/ADT/IndexedMap.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).
|
|
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.
|
|
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;
|
|
|
|
/// 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<unsigned> > 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;
|
|
|
|
VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
|
|
void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
|
|
|
|
public:
|
|
explicit VirtRegMap(MachineFunction &mf);
|
|
|
|
void grow();
|
|
|
|
/// @brief returns true if the specified virtual register is
|
|
/// mapped to a physical register
|
|
bool hasPhys(unsigned virtReg) const {
|
|
return getPhys(virtReg) != NO_PHYS_REG;
|
|
}
|
|
|
|
/// @brief returns the physical register mapped to the specified
|
|
/// virtual register
|
|
unsigned getPhys(unsigned virtReg) const {
|
|
assert(MRegisterInfo::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(Virt2PhysMap[virtReg] == NO_PHYS_REG &&
|
|
"attempt to assign physical register to already mapped "
|
|
"virtual register");
|
|
Virt2PhysMap[virtReg] = physReg;
|
|
}
|
|
|
|
/// @brief clears the specified virtual register's, physical
|
|
/// register mapping
|
|
void clearVirt(unsigned virtReg) {
|
|
assert(MRegisterInfo::isVirtualRegister(virtReg));
|
|
assert(Virt2PhysMap[virtReg] != NO_PHYS_REG &&
|
|
"attempt to clear a not assigned virtual register");
|
|
Virt2PhysMap[virtReg] = NO_PHYS_REG;
|
|
}
|
|
|
|
/// @brief clears all virtual to physical register mappings
|
|
void clearAllVirt() {
|
|
Virt2PhysMap.clear();
|
|
grow();
|
|
}
|
|
|
|
/// @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));
|
|
return Virt2StackSlotMap[virtReg];
|
|
}
|
|
|
|
/// @brief returns the rematerialization id mapped to the specified virtual
|
|
/// register
|
|
int getReMatId(unsigned virtReg) const {
|
|
assert(MRegisterInfo::isVirtualRegister(virtReg));
|
|
return Virt2ReMatIdMap[virtReg];
|
|
}
|
|
|
|
/// @brief create a mapping for the specifed virtual register to
|
|
/// the next available stack slot
|
|
int assignVirt2StackSlot(unsigned virtReg);
|
|
/// @brief create a mapping for the specified virtual register to
|
|
/// 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 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) {
|
|
return SpillPt2VirtMap[Pt];
|
|
}
|
|
|
|
/// @brief records the specified MachineInstr as a spill point for virtReg.
|
|
void addSpillPoint(unsigned virtReg, MachineInstr *Pt) {
|
|
if (SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end())
|
|
SpillPt2VirtMap[Pt].push_back(virtReg);
|
|
else {
|
|
std::vector<unsigned> Virts;
|
|
Virts.push_back(virtReg);
|
|
SpillPt2VirtMap.insert(std::make_pair(Pt, Virts));
|
|
}
|
|
}
|
|
|
|
void transferSpillPts(MachineInstr *Old, MachineInstr *New) {
|
|
std::map<MachineInstr*,std::vector<unsigned> >::iterator I =
|
|
SpillPt2VirtMap.find(Old);
|
|
if (I == SpillPt2VirtMap.end())
|
|
return;
|
|
while (!I->second.empty()) {
|
|
unsigned virtReg = I->second.back();
|
|
I->second.pop_back();
|
|
addSpillPoint(virtReg, 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 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);
|
|
|
|
/// @brief Updates information about the specified virtual register's value
|
|
/// 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
|
|
std::pair<MI2VirtMapTy::const_iterator, MI2VirtMapTy::const_iterator>
|
|
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) {
|
|
MI2VirtMap.erase(MI);
|
|
SpillPt2VirtMap.erase(MI);
|
|
RestorePt2VirtMap.erase(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;
|
|
}
|
|
|
|
/// Spiller interface: Implementations of this interface assign spilled
|
|
/// virtual registers to stack slots, rewriting the code.
|
|
struct Spiller {
|
|
virtual ~Spiller();
|
|
virtual bool runOnMachineFunction(MachineFunction &MF,
|
|
VirtRegMap &VRM) = 0;
|
|
};
|
|
|
|
/// createSpiller - Create an return a spiller object, as specified on the
|
|
/// command line.
|
|
Spiller* createSpiller();
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|