Clean up the public interface of RegScavenger.

Remove unused methods and make others private.

llvm-svn: 79194

llvm/include/llvm/CodeGen/RegisterScavenging.h

@@ -95,31 +95,9 @@ public:
   ///
   void skipTo(MachineBasicBlock::iterator I) { MBBI = I; }
 
-  /// isReserved - Returns true if a register is reserved. It is never "unused".
-  bool isReserved(unsigned Reg) const { return ReservedRegs[Reg]; }
-
-  /// isUsed / isUsed - Test if a register is currently being used.
-  ///
-  bool isUsed(unsigned Reg) const   { return !RegsAvailable[Reg]; }
-  bool isUnused(unsigned Reg) const { return RegsAvailable[Reg]; }
-
-  /// isAliasUsed - Is Reg or an alias currently in use?
-  bool isAliasUsed(unsigned Reg) const;
-
   /// getRegsUsed - return all registers currently in use in used.
   void getRegsUsed(BitVector &used, bool includeReserved);
 
-  /// setUsed / setUnused - Mark the state of one or a number of registers.
-  ///
-  void setUsed(unsigned Reg);
-  void setUsed(BitVector &Regs) {
-    RegsAvailable &= ~Regs;
-  }
-  void setUnused(unsigned Reg, const MachineInstr *MI);
-  void setUnused(BitVector &Regs) {
-    RegsAvailable |= Regs;
-  }
-
   /// FindUnusedReg - Find a unused register of the specified register class
   /// from the specified set of registers. It return 0 is none is found.
   unsigned FindUnusedReg(const TargetRegisterClass *RegClass,
@@ -146,9 +124,26 @@ public:
   }
 
 private:
-  /// restoreScavengedReg - Restore scavenged by loading it back from the
-  /// emergency spill slot. Mark it used.
-  void restoreScavengedReg();
+  /// isReserved - Returns true if a register is reserved. It is never "unused".
+  bool isReserved(unsigned Reg) const { return ReservedRegs.test(Reg); }
+
+  /// isUsed / isUsed - Test if a register is currently being used.
+  ///
+  bool isUsed(unsigned Reg) const   { return !RegsAvailable.test(Reg); }
+  bool isUnused(unsigned Reg) const { return RegsAvailable.test(Reg); }
+
+  /// isAliasUsed - Is Reg or an alias currently in use?
+  bool isAliasUsed(unsigned Reg) const;
+
+  /// setUsed / setUnused - Mark the state of one or a number of registers.
+  ///
+  void setUsed(unsigned Reg);
+  void setUsed(BitVector &Regs) {
+    RegsAvailable &= ~Regs;
+  }
+  void setUnused(BitVector &Regs) {
+    RegsAvailable |= Regs;
+  }
 
   /// Add Reg and all its sub-registers to BV.
   void addRegWithSubRegs(BitVector &BV, unsigned Reg);

llvm/lib/CodeGen/RegisterScavenging.cpp

@@ -40,15 +40,6 @@ void RegScavenger::setUsed(unsigned Reg) {
     RegsAvailable.reset(SubReg);
 }
 
-/// setUnused - Set the register and its sub-registers as being unused.
-void RegScavenger::setUnused(unsigned Reg, const MachineInstr *MI) {
-  RegsAvailable.set(Reg);
-
-  for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
-       unsigned SubReg = *SubRegs; ++SubRegs)
-    RegsAvailable.set(SubReg);
-}
-
 bool RegScavenger::isAliasUsed(unsigned Reg) const {
   if (isUsed(Reg))
     return true;
@@ -118,16 +109,6 @@ void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
   Tracking = false;
 }
 
-void RegScavenger::restoreScavengedReg() {
-  TII->loadRegFromStackSlot(*MBB, MBBI, ScavengedReg,
-                            ScavengingFrameIndex, ScavengedRC);
-  MachineBasicBlock::iterator II = prior(MBBI);
-  TRI->eliminateFrameIndex(II, 0, this);
-  setUsed(ScavengedReg);
-  ScavengedReg = 0;
-  ScavengedRC = NULL;
-}
-
 #ifndef NDEBUG
 /// isLiveInButUnusedBefore - Return true if register is livein the MBB not
 /// not used before it reaches the MI that defines register.