add a new isStoreToStackSlot method

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25909 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Target/MRegisterInfo.h b/include/llvm/Target/MRegisterInfo.h
index d17636d9a4d3e410c9ef2c05073bc4cbd1d4045f..67c118d5a852144a3fcd180d479d1d1b53a8d120 100644 (file)
--- a/include/llvm/Target/MRegisterInfo.h
+++ b/include/llvm/Target/MRegisterInfo.h
@@ -262,12 +262,21 @@ public:
   /// isLoadFromStackSlot - If the specified machine instruction is a direct
   /// load from a stack slot, return the virtual or physical register number of
   /// the destination along with the FrameIndex of the loaded stack slot.  If
-  /// not, return 0.  This predicate must return false if the instruction has
+  /// not, return 0.  This predicate must return 0 if the instruction has
   /// any side effects other than loading from the stack slot.
   virtual unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const{
     return 0;
   }
 
+  /// isStoreToStackSlot - If the specified machine instruction is a direct
+  /// store to a stack slot, return the virtual or physical register number of
+  /// the source reg along with the FrameIndex of the loaded stack slot.  If
+  /// not, return 0.  This predicate must return 0 if the instruction has
+  /// any side effects other than storing to the stack slot.
+  virtual unsigned isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const {
+    return 0;
+  }
+  
   /// foldMemoryOperand - Attempt to fold a load or store of the
   /// specified stack slot into the specified machine instruction for
   /// the specified operand.  If this is possible, a new instruction