1 files changed, 5 insertions, 56 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h
index e5b837aeea28..67583be616c3 100644
--- a/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -95,20 +95,8 @@ private:
     return MO->Contents.Reg.Next;
   }
 
-  /// UsedRegUnits - This is a bit vector that is computed and set by the
-  /// register allocator, and must be kept up to date by passes that run after
-  /// register allocation (though most don't modify this).  This is used
-  /// so that the code generator knows which callee save registers to save and
-  /// for other target specific uses.
-  /// This vector has bits set for register units that are modified in the
-  /// current function. It doesn't include registers clobbered by function
-  /// calls with register mask operands.
-  BitVector UsedRegUnits;
-
   /// UsedPhysRegMask - Additional used physregs including aliases.
   /// This bit vector represents all the registers clobbered by function calls.
-  /// It can model things that UsedRegUnits can't, such as function calls that
-  /// clobber ymm7 but preserve the low half in xmm7.
   BitVector UsedPhysRegMask;
 
   /// ReservedRegs - This is a bit vector of reserved registers.  The target
@@ -647,40 +635,11 @@ public:
   /// deleted during LiveDebugVariables analysis.
   void markUsesInDebugValueAsUndef(unsigned Reg) const;
 
-  //===--------------------------------------------------------------------===//
-  // Physical Register Use Info
-  //===--------------------------------------------------------------------===//
-
-  /// isPhysRegUsed - Return true if the specified register is used in this
-  /// function. Also check for clobbered aliases and registers clobbered by
-  /// function calls with register mask operands.
-  ///
-  /// This only works after register allocation. It is primarily used by
-  /// PrologEpilogInserter to determine which callee-saved registers need
-  /// spilling.
-  bool isPhysRegUsed(unsigned Reg) const {
-    if (UsedPhysRegMask.test(Reg))
-      return true;
-    for (MCRegUnitIterator Units(Reg, getTargetRegisterInfo());
-         Units.isValid(); ++Units)
-      if (UsedRegUnits.test(*Units))
-        return true;
-    return false;
-  }
-
-  /// Mark the specified register unit as used in this function.
-  /// This should only be called during and after register allocation.
-  void setRegUnitUsed(unsigned RegUnit) {
-    UsedRegUnits.set(RegUnit);
-  }
-
-  /// setPhysRegUsed - Mark the specified register used in this function.
-  /// This should only be called during and after register allocation.
-  void setPhysRegUsed(unsigned Reg) {
-    for (MCRegUnitIterator Units(Reg, getTargetRegisterInfo());
-         Units.isValid(); ++Units)
-      UsedRegUnits.set(*Units);
-  }
+  /// Return true if the specified register is modified in this function.
+  /// This checks that no defining machine operands exist for the register or
+  /// any of its aliases. Definitions found on functions marked noreturn are
+  /// ignored.
+  bool isPhysRegModified(unsigned PhysReg) const;
 
   /// addPhysRegsUsedFromRegMask - Mark any registers not in RegMask as used.
   /// This corresponds to the bit mask attached to register mask operands.
@@ -688,16 +647,6 @@ public:
     UsedPhysRegMask.setBitsNotInMask(RegMask);
   }
 
-  /// setPhysRegUnused - Mark the specified register unused in this function.
-  /// This should only be called during and after register allocation.
-  void setPhysRegUnused(unsigned Reg) {
-    UsedPhysRegMask.reset(Reg);
-    for (MCRegUnitIterator Units(Reg, getTargetRegisterInfo());
-         Units.isValid(); ++Units)
-      UsedRegUnits.reset(*Units);
-  }
-
-
   //===--------------------------------------------------------------------===//
   // Reserved Register Info
   //===--------------------------------------------------------------------===//