- Allow target to specify when is register pressure "too high". In most cases,

[oota-llvm.git] / lib / Target / ARM / ARMBaseRegisterInfo.h

diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.h b/lib/Target/ARM/ARMBaseRegisterInfo.h
index ac5e6b67338ce56f9c0a46da48b0e93be1f3f241..eefbc126923f135e4bca24c1e4974222b179f0d9 100644 (file)
--- a/lib/Target/ARM/ARMBaseRegisterInfo.h
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.h
@@ -1,4 +1,4 @@
-//===- ARMBaseRegisterInfo.h - ARM Register Information Impl --------*- C++ -*-===//
+//===- ARMBaseRegisterInfo.h - ARM Register Information Impl ----*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -44,7 +44,7 @@ static inline bool isARMLowRegister(unsigned Reg) {
   }
 }
 
-struct ARMBaseRegisterInfo : public ARMGenRegisterInfo {
+class ARMBaseRegisterInfo : public ARMGenRegisterInfo {
 protected:
   const ARMBaseInstrInfo &TII;
   const ARMSubtarget &STI;
@@ -59,13 +59,6 @@ protected:
   // Return the opcode that implements 'Op', or 0 if no opcode
   unsigned getOpcode(int Op) const;
 
-  // If 'opcode' is an instruction with an unsigned offset that also
-  // has a version with a signed offset, return the opcode for the
-  // version with the signed offset. In 'NumBits' return the number of
-  // bits for the signed offset.
-  unsigned unsignedOffsetOpcodeToSigned(unsigned opcode,
-                                        unsigned *NumBits) const;
-
 public:
   /// getRegisterNumbering - Given the enum value for some register, e.g.
   /// ARM::LR, return the number that it corresponds to (e.g. 14). It
@@ -76,12 +69,26 @@ public:
   /// Code Generation virtual methods...
   const unsigned *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
 
-  const TargetRegisterClass* const*
-  getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
-
   BitVector getReservedRegs(const MachineFunction &MF) const;
 
-  const TargetRegisterClass *getPointerRegClass() const;
+  /// getMatchingSuperRegClass - Return a subclass of the specified register
+  /// class A so that each register in it has a sub-register of the
+  /// specified sub-register index which is in the specified register class B.
+  virtual const TargetRegisterClass *
+  getMatchingSuperRegClass(const TargetRegisterClass *A,
+                           const TargetRegisterClass *B, unsigned Idx) const;
+
+  /// canCombineSubRegIndices - Given a register class and a list of
+  /// subregister indices, return true if it's possible to combine the
+  /// subregister indices into one that corresponds to a larger
+  /// subregister. Return the new subregister index by reference. Note the
+  /// new index may be zero if the given subregisters can be combined to
+  /// form the whole register.
+  virtual bool canCombineSubRegIndices(const TargetRegisterClass *RC,
+                                       SmallVectorImpl<unsigned> &SubIndices,
+                                       unsigned &NewSubIdx) const;
+
+  const TargetRegisterClass *getPointerRegClass(unsigned Kind = 0) const;
 
   std::pair<TargetRegisterClass::iterator,TargetRegisterClass::iterator>
   getAllocationOrder(const TargetRegisterClass *RC,
@@ -96,12 +103,20 @@ public:
 
   bool hasFP(const MachineFunction &MF) const;
 
+  bool canRealignStack(const MachineFunction &MF) const;
+  bool needsStackRealignment(const MachineFunction &MF) const;
+
+  bool cannotEliminateFrame(const MachineFunction &MF) const;
+
   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
                                             RegScavenger *RS = NULL) const;
 
   // Debug information queries.
   unsigned getRARegister() const;
-  unsigned getFrameRegister(MachineFunction &MF) const;
+  unsigned getFrameRegister(const MachineFunction &MF) const;
+  int getFrameIndexReference(const MachineFunction &MF, int FI,
+                             unsigned &FrameReg) const;
+  int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
 
   // Exception handling queries.
   unsigned getEHExceptionRegister() const;
@@ -127,19 +142,25 @@ public:
 
   virtual bool requiresRegisterScavenging(const MachineFunction &MF) const;
 
-  virtual bool hasReservedCallFrame(MachineFunction &MF) const;
+  virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const;
+
+  virtual bool hasReservedCallFrame(const MachineFunction &MF) const;
+  virtual bool canSimplifyCallFramePseudos(const MachineFunction &MF) const;
 
   virtual void eliminateCallFramePseudoInstr(MachineFunction &MF,
-                                             MachineBasicBlock &MBB,
-                                             MachineBasicBlock::iterator I) const;
+                                           MachineBasicBlock &MBB,
+                                           MachineBasicBlock::iterator I) const;
 
-  virtual void eliminateFrameIndex(MachineBasicBlock::iterator II,
-                                   int SPAdj, RegScavenger *RS = NULL) const;
+  virtual unsigned eliminateFrameIndex(MachineBasicBlock::iterator II,
+                                       int SPAdj, FrameIndexValue *Value = NULL,
+                                       RegScavenger *RS = NULL) const;
 
   virtual void emitPrologue(MachineFunction &MF) const;
   virtual void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
 
 private:
+  unsigned estimateRSStackSizeLimit(MachineFunction &MF) const;
+
   unsigned getRegisterPairEven(unsigned Reg, const MachineFunction &MF) const;
 
   unsigned getRegisterPairOdd(unsigned Reg, const MachineFunction &MF) const;