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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179925 91177308-0d34-0410-b5e6-96231b3b80d8
180 lines
5.9 KiB
C++
180 lines
5.9 KiB
C++
//===-- ARMBaseRegisterInfo.h - ARM Register Information Impl ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the base ARM implementation of TargetRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef ARMBASEREGISTERINFO_H
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#define ARMBASEREGISTERINFO_H
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#include "ARM.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#define GET_REGINFO_HEADER
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#include "ARMGenRegisterInfo.inc"
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namespace llvm {
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class ARMSubtarget;
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class ARMBaseInstrInfo;
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class Type;
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/// Register allocation hints.
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namespace ARMRI {
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enum {
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RegPairOdd = 1,
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RegPairEven = 2
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};
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}
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/// isARMArea1Register - Returns true if the register is a low register (r0-r7)
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/// or a stack/pc register that we should push/pop.
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static inline bool isARMArea1Register(unsigned Reg, bool isIOS) {
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using namespace ARM;
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switch (Reg) {
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case R0: case R1: case R2: case R3:
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case R4: case R5: case R6: case R7:
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case LR: case SP: case PC:
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return true;
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case R8: case R9: case R10: case R11:
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// For iOS we want r7 and lr to be next to each other.
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return !isIOS;
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default:
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return false;
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}
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}
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static inline bool isARMArea2Register(unsigned Reg, bool isIOS) {
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using namespace ARM;
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switch (Reg) {
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case R8: case R9: case R10: case R11:
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// iOS has this second area.
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return isIOS;
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default:
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return false;
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}
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}
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static inline bool isARMArea3Register(unsigned Reg, bool isIOS) {
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using namespace ARM;
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switch (Reg) {
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case D15: case D14: case D13: case D12:
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case D11: case D10: case D9: case D8:
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return true;
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default:
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return false;
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}
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}
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class ARMBaseRegisterInfo : public ARMGenRegisterInfo {
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protected:
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const ARMBaseInstrInfo &TII;
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const ARMSubtarget &STI;
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/// FramePtr - ARM physical register used as frame ptr.
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unsigned FramePtr;
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/// BasePtr - ARM physical register used as a base ptr in complex stack
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/// frames. I.e., when we need a 3rd base, not just SP and FP, due to
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/// variable size stack objects.
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unsigned BasePtr;
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// Can be only subclassed.
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explicit ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii,
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const ARMSubtarget &STI);
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// Return the opcode that implements 'Op', or 0 if no opcode
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unsigned getOpcode(int Op) const;
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public:
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/// Code Generation virtual methods...
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const uint16_t *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
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const uint32_t *getCallPreservedMask(CallingConv::ID) const;
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const uint32_t *getThisReturnPreservedMask(CallingConv::ID) const;
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const uint32_t *getNoPreservedMask() const;
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BitVector getReservedRegs(const MachineFunction &MF) const;
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const TargetRegisterClass*
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getPointerRegClass(const MachineFunction &MF, unsigned Kind = 0) const;
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const TargetRegisterClass*
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getCrossCopyRegClass(const TargetRegisterClass *RC) const;
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const TargetRegisterClass*
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getLargestLegalSuperClass(const TargetRegisterClass *RC) const;
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unsigned getRegPressureLimit(const TargetRegisterClass *RC,
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MachineFunction &MF) const;
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void getRegAllocationHints(unsigned VirtReg,
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ArrayRef<MCPhysReg> Order,
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SmallVectorImpl<MCPhysReg> &Hints,
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const MachineFunction &MF,
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const VirtRegMap *VRM) const;
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void UpdateRegAllocHint(unsigned Reg, unsigned NewReg,
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MachineFunction &MF) const;
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virtual bool avoidWriteAfterWrite(const TargetRegisterClass *RC) const;
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bool hasBasePointer(const MachineFunction &MF) const;
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bool canRealignStack(const MachineFunction &MF) const;
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bool needsStackRealignment(const MachineFunction &MF) const;
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int64_t getFrameIndexInstrOffset(const MachineInstr *MI, int Idx) const;
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bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const;
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void materializeFrameBaseRegister(MachineBasicBlock *MBB,
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unsigned BaseReg, int FrameIdx,
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int64_t Offset) const;
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void resolveFrameIndex(MachineBasicBlock::iterator I,
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unsigned BaseReg, int64_t Offset) const;
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bool isFrameOffsetLegal(const MachineInstr *MI, int64_t Offset) const;
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bool cannotEliminateFrame(const MachineFunction &MF) const;
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// Debug information queries.
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unsigned getFrameRegister(const MachineFunction &MF) const;
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unsigned getBaseRegister() const { return BasePtr; }
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// Exception handling queries.
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unsigned getEHExceptionRegister() const;
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unsigned getEHHandlerRegister() const;
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bool isLowRegister(unsigned Reg) const;
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/// emitLoadConstPool - Emits a load from constpool to materialize the
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/// specified immediate.
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virtual void emitLoadConstPool(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator &MBBI,
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DebugLoc dl,
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unsigned DestReg, unsigned SubIdx,
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int Val,
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ARMCC::CondCodes Pred = ARMCC::AL,
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unsigned PredReg = 0,
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unsigned MIFlags = MachineInstr::NoFlags)const;
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/// Code Generation virtual methods...
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virtual bool requiresRegisterScavenging(const MachineFunction &MF) const;
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virtual bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const;
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virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const;
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virtual bool requiresVirtualBaseRegisters(const MachineFunction &MF) const;
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virtual void eliminateFrameIndex(MachineBasicBlock::iterator II,
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int SPAdj, unsigned FIOperandNum,
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RegScavenger *RS = NULL) const;
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};
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} // end namespace llvm
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#endif
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