#define LLVM_CODEGEN_VIRTREGMAP_H
#include "llvm/Target/MRegisterInfo.h"
-#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/BitVector.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;
/// 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;
+ IndexedMap<int, VirtReg2IndexFunctor> Virt2ReMatIdMap;
/// 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;
+ /// 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;
+
+ /// 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
- enum {
- NO_PHYS_REG = 0,
- NO_STACK_SLOT = ~0 >> 1
- };
-
public:
- VirtRegMap(MachineFunction &mf);
+ explicit VirtRegMap(MachineFunction &mf);
void grow();
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 returns true is the specified virtual register is not
+ /// mapped to a stack slot or rematerialized.
+ bool isAssignedReg(unsigned virtReg) const {
+ return getStackSlot(virtReg) == NO_STACK_SLOT &&
+ getReMatId(virtReg) == NO_STACK_SLOT;
}
/// @brief returns the stack slot mapped to the specified virtual
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);
/// 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 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>
}
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;
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