src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.loop/src/org/graalvm/compiler/loop/DerivedScaledInductionVariable.java

rev 52509 : [mq]: graal

*** 61,77 ****
          return value;
      }
  
      @Override
      public Direction direction() {
          Stamp stamp = scale.stamp(NodeView.DEFAULT);
          if (stamp instanceof IntegerStamp) {
              IntegerStamp integerStamp = (IntegerStamp) stamp;
              if (integerStamp.isStrictlyPositive()) {
!                 return base.direction();
              } else if (integerStamp.isStrictlyNegative()) {
!                 return base.direction().opposite();
              }
          }
          return null;
      }
  
--- 61,81 ----
          return value;
      }
  
      @Override
      public Direction direction() {
+         Direction baseDirection = base.direction();
+         if (baseDirection == null) {
+             return null;
+         }
          Stamp stamp = scale.stamp(NodeView.DEFAULT);
          if (stamp instanceof IntegerStamp) {
              IntegerStamp integerStamp = (IntegerStamp) stamp;
              if (integerStamp.isStrictlyPositive()) {
!                 return baseDirection;
              } else if (integerStamp.isStrictlyNegative()) {
!                 return baseDirection.opposite();
              }
          }
          return null;
      }