typedef const unsigned* const_iterator;
private:
- const unsigned RegSize; // Size of register in bytes
+ const unsigned RegSize, Alignment; // Size & Alignment of register in bytes
const iterator RegsBegin, RegsEnd;
public:
- TargetRegisterClass(unsigned RS, iterator RB, iterator RE)
- : RegSize(RS), RegsBegin(RB), RegsEnd(RE) {}
+ TargetRegisterClass(unsigned RS, unsigned Al, iterator RB, iterator RE)
+ : RegSize(RS), Alignment(Al), RegsBegin(RB), RegsEnd(RE) {}
virtual ~TargetRegisterClass() {} // Allow subclasses
+ // begin/end - Return all of the registers in this class.
iterator begin() const { return RegsBegin; }
iterator end() const { return RegsEnd; }
+ // getNumRegs - Return the number of registers in this class
unsigned getNumRegs() const { return RegsEnd-RegsBegin; }
+
+ // getRegister - Return the specified register in the class
unsigned getRegister(unsigned i) const {
assert(i < getNumRegs() && "Register number out of range!");
return RegsBegin[i];
}
- unsigned getDataSize() const { return RegSize; }
+ /// allocation_order_begin/end - These methods define a range of registers
+ /// which specify the registers in this class that are valid to register
+ /// allocate, and the preferred order to allocate them in. For example,
+ /// callee saved registers should be at the end of the list, because it is
+ /// cheaper to allocate caller saved registers.
+ ///
+ /// These methods take a MachineFunction argument, which can be used to tune
+ /// the allocatable registers based on the characteristics of the function.
+ /// One simple example is that the frame pointer register can be used if
+ /// frame-pointer-elimination is performed.
+ ///
+ /// By default, these methods return all registers in the class.
+ ///
+ virtual iterator allocation_order_begin(MachineFunction &MF) const {
+ return begin();
+ }
+ virtual iterator allocation_order_end(MachineFunction &MF) const {
+ return end();
+ }
+
+
+
+ /// getSize - Return the size of the register in bytes, which is also the size
+ /// of a stack slot allocated to hold a spilled copy of this register.
+ unsigned getSize() const { return RegSize; }
+
+ /// getAlignment - Return the minimum required alignment for a register of
+ /// this class.
+ unsigned getAlignment() const { return Alignment; }
};
regclass_iterator RegClassBegin, RegClassEnd; // List of regclasses
const TargetRegisterClass **PhysRegClasses; // Reg class for each register
+ int CallFrameSetupOpcode, CallFrameDestroyOpcode;
protected:
MRegisterInfo(const MRegisterDesc *D, unsigned NR,
- regclass_iterator RegClassBegin, regclass_iterator RegClassEnd);
+ regclass_iterator RegClassBegin, regclass_iterator RegClassEnd,
+ int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);
virtual ~MRegisterInfo();
public:
return get(RegNo).AliasSet;
}
- virtual unsigned getFramePointer() const = 0;
- virtual unsigned getStackPointer() const = 0;
-
virtual const unsigned* getCalleeSaveRegs() const = 0;
- virtual const unsigned* getCallerSaveRegs() const = 0;
//===--------------------------------------------------------------------===//
//===--------------------------------------------------------------------===//
- // Interfaces used primarily by the register allocator to move data around
- // between registers, immediates and memory.
+ // Interfaces used by the register allocator and stack frame manipulation
+ // passes to move data around between registers, immediates and memory.
//
- virtual void emitPrologue(MachineFunction &MF, unsigned Bytes) const = 0;
- virtual void emitEpilogue(MachineBasicBlock &MBB, unsigned Bytes) const = 0;
-
- virtual void storeReg2RegOffset(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned SrcReg, unsigned DestReg,
- unsigned ImmOffset,
- const TargetRegisterClass *RC) const = 0;
-
- virtual void loadRegOffset2Reg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned DestReg, unsigned SrcReg,
- unsigned ImmOffset,
- const TargetRegisterClass *RC) const = 0;
-
- virtual void moveReg2Reg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned DestReg, unsigned SrcReg,
- const TargetRegisterClass *RC) const = 0;
-
- virtual void moveImm2Reg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned DestReg, unsigned Imm,
- const TargetRegisterClass *RC) const = 0;
+ virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned SrcReg, int FrameIndex,
+ const TargetRegisterClass *RC) const = 0;
+
+ virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned DestReg, int FrameIndex,
+ const TargetRegisterClass *RC) const = 0;
+
+ virtual void copyRegToReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned DestReg, unsigned SrcReg,
+ const TargetRegisterClass *RC) const = 0;
+
+
+ /// getCallFrameSetup/DestroyOpcode - These methods return the opcode of the
+ /// frame setup/destroy instructions if they exist (-1 otherwise). Some
+ /// targets use pseudo instructions in order to abstract away the difference
+ /// between operating with a frame pointer and operating without, through the
+ /// use of these two instructions.
+ ///
+ int getCallFrameSetupOpcode() const { return CallFrameSetupOpcode; }
+ int getCallFrameDestroyOpcode() const { return CallFrameDestroyOpcode; }
+
+
+ /// eliminateCallFramePseudoInstr - This method is called during prolog/epilog
+ /// code insertion to eliminate call frame setup and destroy pseudo
+ /// instructions (but only if the Target is using them). It is responsible
+ /// for eliminating these instructions, replacing them with concrete
+ /// instructions. This method need only be implemented if using call frame
+ /// setup/destroy pseudo instructions.
+ ///
+ virtual void eliminateCallFramePseudoInstr(MachineFunction &MF,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &I) const {
+ assert(getCallFrameSetupOpcode()== -1 && getCallFrameDestroyOpcode()== -1 &&
+ "eliminateCallFramePseudoInstr must be implemented if using"
+ " call frame setup/destroy pseudo instructions!");
+ assert(0 && "Call Frame Pseudo Instructions do not exist on this target!");
+ }
+
+ /// processFunctionBeforeFrameFinalized - This method is called immediately
+ /// before the specified functions frame layout (MF.getFrameInfo()) is
+ /// finalized. Once the frame is finalized, MO_FrameIndex operands are
+ /// replaced with direct constants. This method is optional.
+ ///
+ virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {}
+
+ /// eliminateFrameIndex - This method must be overriden to eliminate abstract
+ /// frame indices from instructions which may use them. The instruction
+ /// referenced by the iterator contains an MO_FrameIndex operand which must be
+ /// eliminated by this method. This method may modify or replace the
+ /// specified instruction, as long as it keeps the iterator pointing the the
+ /// finished product.
+ ///
+ virtual void eliminateFrameIndex(MachineFunction &MF,
+ MachineBasicBlock::iterator &II) const = 0;
+
+ /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
+ /// the function.
+ virtual void emitPrologue(MachineFunction &MF) const = 0;
+ virtual void emitEpilogue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const = 0;
};
#endif
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