[llvm-commits] [llvm] r49408 - /llvm/branches/ggreif/use-diet/include/llvm/Use.h

[Gabor Greif]

Author: ggreif
Date: Tue Apr  8 18:22:52 2008
New Revision: 49408

URL: http://llvm.org/viewvc/llvm-project?rev=49408&view=rev
Log:
preliminary tag stripping

Modified:
    llvm/branches/ggreif/use-diet/include/llvm/Use.h

Modified: llvm/branches/ggreif/use-diet/include/llvm/Use.h
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/ggreif/use-diet/include/llvm/Use.h?rev=49408&r1=49407&r2=49408&view=diff

==============================================================================
--- llvm/branches/ggreif/use-diet/include/llvm/Use.h (original)
+++ llvm/branches/ggreif/use-diet/include/llvm/Use.h Tue Apr  8 18:22:52 2008
@@ -36,18 +36,18 @@
   inline void init(Value *V, User *U);
 
   Use(Value *V, User *U) { init(V, U); }
-  Use(const Use &U) { init(U.Val, U.U); }
+  Use(const Use &U) { init(U.get(), U.U); }
   inline ~Use() {
-    if (Val) removeFromList();
+    if (get()) removeFromList();
   }
 
   /// Default ctor - This leaves the Use completely uninitialized.  The only thing
   /// that is valid to do with this use is to call the "init" method.
-  inline Use() : Val(0) {}
+  inline Use() {}
 
 
-  operator Value*() const { return Val; }
-  Value *get() const { return Val; }
+  operator Value*() const { return stripTag(Val); }
+  Value *get() const { return stripTag(Val); }
   User *getUser() const { return U; }
   const Use* getImpliedUser() const;
   static void initTags(Use *Start, Use *Stop, ptrdiff_t Done = 0);
@@ -59,12 +59,12 @@
     return RHS;
   }
   const Use &operator=(const Use &RHS) {
-    set(RHS.Val);
+    set(RHS.get());
     return *this;
   }
 
-        Value *operator->()       { return Val; }
-  const Value *operator->() const { return Val; }
+        Value *operator->()       { return stripTag(Val); }
+  const Value *operator->() const { return stripTag(Val); }
 
   Use *getNext() const { return Next; }
 private:
@@ -72,6 +72,9 @@
   Value *Val;
   User *U;
 
+  static Value *stripTag(Value *V) {
+    return reinterpret_cast<Value*>(reinterpret_cast<ptrdiff_t>(V) & ~3UL);
+  }
   void addToList(Use **List) {
     Next = *List;
     if (Next) Next->Prev = &Next;