//
// 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 <map>
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/ADT/IndexedMap.h"
namespace llvm {
class MachineInstr;
+ class MachineFunction;
+ class MachineRegisterInfo;
+ class TargetInstrInfo;
+ class raw_ostream;
+ class SlotIndexes;
- class VirtRegMap {
+ class VirtRegMap : public MachineFunctionPass {
public:
- typedef std::multimap<MachineInstr*, unsigned> MI2VirtMapTy;
-
- private:
- MachineFunction &MF;
- DenseMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
- DenseMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
- MI2VirtMapTy MI2VirtMap;
-
- VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
- void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
-
enum {
NO_PHYS_REG = 0,
- NO_STACK_SLOT = ~0 >> 1
+ NO_STACK_SLOT = (1L << 30)-1,
+ MAX_STACK_SLOT = (1L << 18)-1
};
+ private:
+ MachineRegisterInfo *MRI;
+ const TargetInstrInfo *TII;
+ const TargetRegisterInfo *TRI;
+ 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;
+
+ /// Virt2SplitMap - This is virtual register to splitted virtual register
+ /// mapping.
+ IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2SplitMap;
+
+ /// createSpillSlot - Allocate a spill slot for RC from MFI.
+ unsigned createSpillSlot(const TargetRegisterClass *RC);
+
+ VirtRegMap(const VirtRegMap&) LLVM_DELETED_FUNCTION;
+ void operator=(const VirtRegMap&) LLVM_DELETED_FUNCTION;
+
public:
- VirtRegMap(MachineFunction &mf)
- : MF(mf), Virt2PhysMap(NO_PHYS_REG), Virt2StackSlotMap(NO_STACK_SLOT) {
- grow();
+ static char ID;
+ VirtRegMap() : MachineFunctionPass(ID), Virt2PhysMap(NO_PHYS_REG),
+ Virt2StackSlotMap(NO_STACK_SLOT), Virt2SplitMap(0) { }
+ virtual bool runOnMachineFunction(MachineFunction &MF);
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ MachineFunctionPass::getAnalysisUsage(AU);
}
+ MachineFunction &getMachineFunction() const {
+ assert(MF && "getMachineFunction called before runOnMachineFunction");
+ return *MF;
+ }
+
+ MachineRegisterInfo &getRegInfo() const { return *MRI; }
+ const TargetRegisterInfo &getTargetRegInfo() const { return *TRI; }
+
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));
+ 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");
Virt2PhysMap[virtReg] = physReg;
}
+ /// @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;
}
+ /// @brief clears all virtual to physical register mappings
void clearAllVirt() {
Virt2PhysMap.clear();
grow();
}
- bool hasStackSlot(unsigned virtReg) const {
- return getStackSlot(virtReg) != NO_STACK_SLOT;
+ /// @brief returns the register allocation preference.
+ unsigned getRegAllocPref(unsigned virtReg);
+
+ /// @brief returns true if VirtReg is assigned to its preferred physreg.
+ bool hasPreferredPhys(unsigned VirtReg) {
+ return getPhys(VirtReg) == getRegAllocPref(VirtReg);
+ }
+
+ /// @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) const {
+ return Virt2SplitMap[virtReg];
+ }
+
+ /// getOriginal - Return the original virtual register that VirtReg descends
+ /// from through splitting.
+ /// A register that was not created by splitting is its own original.
+ /// This operation is idempotent.
+ unsigned getOriginal(unsigned VirtReg) const {
+ unsigned Orig = getPreSplitReg(VirtReg);
+ return Orig ? Orig : VirtReg;
+ }
+
+ /// @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)
+ 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 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);
- void virtFolded(unsigned virtReg, MachineInstr* oldMI,
- MachineInstr* newMI);
-
- std::pair<MI2VirtMapTy::const_iterator, MI2VirtMapTy::const_iterator>
- getFoldedVirts(MachineInstr* MI) const {
- return MI2VirtMap.equal_range(MI);
- }
-
- void print(std::ostream &OS) const;
+ void print(raw_ostream &OS, const Module* M = 0) const;
void dump() const;
};
- inline std::ostream &operator<<(std::ostream &OS, const VirtRegMap &VRM) {
+ inline raw_ostream &operator<<(raw_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,
- const VirtRegMap &VRM) = 0;
- };
-
- /// createSpiller - Create an return a spiller object, as specified on the
- /// command line.
- Spiller* createSpiller();
-
} // End llvm namespace
#endif
projects / oota-llvm.git / blobdiff