add nocapture attribute to llvm.mem* intrinsics and have tblgen

parse them.  tblgen doesn't yet do anything with this info though.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62065 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/CodeGenIntrinsics.h

@@ -63,13 +63,17 @@ namespace llvm {
       NoMem, ReadArgMem, ReadMem, WriteArgMem, WriteMem
     } ModRef;
 
-    // This is set to true if the intrinsic is overloaded by its argument
-    // types.
+    /// This is set to true if the intrinsic is overloaded by its argument
+    /// types.
     bool isOverloaded;
 
-    // isCommutative - True if the intrinsic is commutative.
-    //
+    /// isCommutative - True if the intrinsic is commutative.
     bool isCommutative;
+    
+    enum ArgAttribute {
+      NoCapture
+    };
+    std::vector<std::pair<unsigned, ArgAttribute> > ArgumentAttributes;
 
     CodeGenIntrinsic(Record *R);
   };

utils/TableGen/CodeGenTarget.cpp

@@ -546,7 +546,10 @@ CodeGenIntrinsic::CodeGenIntrinsic(Record *R) {
       ModRef = WriteMem;
     else if (Property->getName() == "Commutative")
       isCommutative = true;
-    else
+    else if (Property->isSubClassOf("NoCapture")) {
+      unsigned ArgNo = Property->getValueAsInt("ArgNo");
+      ArgumentAttributes.push_back(std::make_pair(ArgNo, NoCapture));
+    } else
       assert(0 && "Unknown property!");
   }
 }