*** old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/alloc/lsra/Range.java	Mon Mar 20 17:39:51 2017
--- new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/alloc/lsra/Range.java	Mon Mar 20 17:39:51 2017

*** 25,36 ****
--- 25,34 ----
  /**
   * Represents a range of integers from a start (inclusive) to an end (exclusive.
   */
  public final class Range {
  
      public static final Range EndMarker = new Range(Integer.MAX_VALUE, Integer.MAX_VALUE, null);
  
      /**
       * The start of the range, inclusive.
       */
      public int from;
  

*** 59,105 ****
--- 57,108 ----
          this.from = from;
          this.to = to;
          this.next = next;
      }
  
+     public boolean isEndMarker() {
+         assert from != Integer.MAX_VALUE || (to == Integer.MAX_VALUE && next == null);
+         return from == Integer.MAX_VALUE;
+     }
+ 
      int intersectsAt(Range other) {
          Range r1 = this;
          Range r2 = other;
  
          assert r2 != null : "null ranges not allowed";
!         assert r1 != EndMarker && r2 != EndMarker : "empty ranges not allowed";
!         assert !r1.isEndMarker() && !r2.isEndMarker() : "empty ranges not allowed";
  
          do {
              if (r1.from < r2.from) {
                  if (r1.to <= r2.from) {
                      r1 = r1.next;
!                     if (r1 == EndMarker) {
!                     if (r1.isEndMarker()) {
                          return -1;
                      }
                  } else {
                      return r2.from;
                  }
              } else {
                  if (r2.from < r1.from) {
                      if (r2.to <= r1.from) {
                          r2 = r2.next;
!                         if (r2 == EndMarker) {
!                         if (r2.isEndMarker()) {
                              return -1;
                          }
                      } else {
                          return r1.from;
                      }
                  } else { // r1.from() == r2.from()
                      if (r1.from == r1.to) {
                          r1 = r1.next;
!                         if (r1 == EndMarker) {
!                         if (r1.isEndMarker()) {
                              return -1;
                          }
                      } else {
                          if (r2.from == r2.to) {
                              r2 = r2.next;
!                             if (r2 == EndMarker) {
!                             if (r2.isEndMarker()) {
                                  return -1;
                              }
                          } else {
                              return r1.from;
                          }