Make compile-time constants in _IntegerImplementation.compareTo const.

runtime/lib/integers.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // TODO(srdjan): fix limitations.
 // - shift amount must be a Smi.
 class _IntegerImplementation {
   factory _IntegerImplementation._uninstantiable() {
     throw new UnsupportedError(
         "_IntegerImplementation can only be allocated by the VM");
@@ skipping 99 matching lines @@
     // The value of binary number weights each bit by a power of two.  The
     // twos-complement value weights the sign bit negatively.  We compute the
     // value of the negative weighting by isolating the sign bit with the
     // correct power of two weighting and subtracting it from the value of the
     // lower bits.
     int signMask = 1 << (width - 1);
     return (this & (signMask - 1)) - (this & signMask);
   }
 
   int compareTo(num other) {
-    final int EQUAL = 0, LESS = -1, GREATER = 1;
+    const int EQUAL = 0, LESS = -1, GREATER = 1;
     if (other is double) {
-      // TODO(floitsch): the following locals should be 'const'.
-      int MAX_EXACT_INT_TO_DOUBLE = 9007199254740992;  // 2^53.
-      int MIN_EXACT_INT_TO_DOUBLE = -MAX_EXACT_INT_TO_DOUBLE;
+      const int MAX_EXACT_INT_TO_DOUBLE = 9007199254740992;  // 2^53.
+      const int MIN_EXACT_INT_TO_DOUBLE = -MAX_EXACT_INT_TO_DOUBLE;
       double d = other;
       if (d.isInfinite) {
         return d == double.NEGATIVE_INFINITY ? GREATER : LESS;
       }
       if (d.isNaN) {
         return LESS;
       }
       if (MIN_EXACT_INT_TO_DOUBLE <= this && this <= MAX_EXACT_INT_TO_DOUBLE) {
         // Let the double implementation deal with -0.0.
         return -(d.compareTo(this.toDouble()));
@@ skipping 333 matching lines @@
     } else {
       return 0;
     }
   }
   int _shlFromInt(int other) native "Bigint_shlFromInt";
 
   int pow(int exponent) {
     throw "Bigint.pow not implemented";
   }
 }