*** old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.word/src/org/graalvm/compiler/word/Word.java	Fri Jul  7 09:31:57 2017
--- new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.word/src/org/graalvm/compiler/word/Word.java	Fri Jul  7 09:31:57 2017

*** 78,87 ****
--- 78,89 ----
       * The canonical {@link Operation} represented by a method in the {@link Word} class.
       */
      public enum Opcode {
          NODE_CLASS,
          COMPARISON,
+         IS_NULL,
+         IS_NON_NULL,
          NOT,
          READ_POINTER,
          READ_OBJECT,
          READ_BARRIERED,
          READ_HEAP,

*** 424,433 ****
--- 426,447 ----
      public Word not() {
          return box(~unbox());
      }
  
      @Override
+     @Operation(opcode = Opcode.IS_NULL)
+     public boolean isNull() {
+         return equal(WordFactory.zero());
+     }
+ 
+     @Override
+     @Operation(opcode = Opcode.IS_NON_NULL)
+     public boolean isNonNull() {
+         return notEqual(WordFactory.zero());
+     }
+ 
+     @Override
      @Operation(opcode = Opcode.COMPARISON, condition = Condition.EQ)
      public boolean equal(ComparableWord val) {
          return equal((Word) val);
      }
  

*** 714,724 ****
--- 728,738 ----
      }
  
      @Override
      @Operation(opcode = Opcode.READ_POINTER)
      public <T extends WordBase> T readWord(int offset, LocationIdentity locationIdentity) {
-         return readWord((WordBase)signed(offset), locationIdentity);
      }
  
      @Override
      @Operation(opcode = Opcode.READ_POINTER)
      public Object readObject(int offset, LocationIdentity locationIdentity) {

*** 941,951 ****
--- 955,965 ----
      }
  
      @Override
      @Operation(opcode = Opcode.READ_POINTER)
      public <T extends WordBase> T readWord(int offset) {
-         return readWord((WordBase)signed(offset));
      }
  
      @Override
      @Operation(opcode = Opcode.READ_POINTER)
      public Object readObject(int offset) {

*** 1114,1124 ****
--- 1128,1138 ----
      }
  
      @Override
      @Operation(opcode = Opcode.CAS_POINTER)
      public <T extends WordBase> T compareAndSwapWord(int offset, T expectedValue, T newValue, LocationIdentity locationIdentity) {
-         return compareAndSwapWord((WordBase)signed(offset), expectedValue, newValue, locationIdentity);
      }
  
      @Override
      @Operation(opcode = Opcode.CAS_POINTER)
      public Object compareAndSwapObject(int offset, Object expectedValue, Object newValue, LocationIdentity locationIdentity) {