[DAG] Add const variants for BaseIndexOffset functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345623 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/SelectionDAGAddressAnalysis.h

@@ -45,18 +45,21 @@ public:
         IsIndexSignExt(IsIndexSignExt) {}
 
   SDValue getBase() { return Base; }
+  SDValue getBase() const { return Base; }
   SDValue getIndex() { return Index; }
+  SDValue getIndex() const { return Index; }
 
-  bool equalBaseIndex(BaseIndexOffset &Other, const SelectionDAG &DAG) {
+  bool equalBaseIndex(const BaseIndexOffset &Other,
+                      const SelectionDAG &DAG) const {
     int64_t Off;
     return equalBaseIndex(Other, DAG, Off);
   }
 
-  bool equalBaseIndex(BaseIndexOffset &Other, const SelectionDAG &DAG,
-                      int64_t &Off);
+  bool equalBaseIndex(const BaseIndexOffset &Other, const SelectionDAG &DAG,
+                      int64_t &Off) const;
 
   /// Parses tree in Ptr for base, index, offset addresses.
-  static BaseIndexOffset match(LSBaseSDNode *N, const SelectionDAG &DAG);
+  static BaseIndexOffset match(const LSBaseSDNode *N, const SelectionDAG &DAG);
 };
 
 } // end namespace llvm

lib/CodeGen/SelectionDAG/SelectionDAGAddressAnalysis.cpp

@@ -19,8 +19,9 @@
 
 using namespace llvm;
 
-bool BaseIndexOffset::equalBaseIndex(BaseIndexOffset &Other,
-                                     const SelectionDAG &DAG, int64_t &Off) {
+bool BaseIndexOffset::equalBaseIndex(const BaseIndexOffset &Other,
+                                     const SelectionDAG &DAG,
+                                     int64_t &Off) const {
   // Conservatively fail if we a match failed..
   if (!Base.getNode() || !Other.Base.getNode())
     return false;
@@ -75,7 +76,7 @@ bool BaseIndexOffset::equalBaseIndex(BaseIndexOffset &Other,
 }
 
 /// Parses tree in Ptr for base, index, offset addresses.
-BaseIndexOffset BaseIndexOffset::match(LSBaseSDNode *N,
+BaseIndexOffset BaseIndexOffset::match(const LSBaseSDNode *N,
                                        const SelectionDAG &DAG) {
   SDValue Ptr = N->getBasePtr();