third_party/WebKit/LayoutTests/fast/js/regress/script-tests/big-int-mul.js

   1 // Test the performance of integer multiplication by implementing a 16-bit
   2 // string hash.
   3
   4 function stringHash(string)
   5 {
   6     // source: http://en.wikipedia.org/wiki/Java_hashCode()#Sample_implementations_of_the_java.lang.String_algorithm
   7     var h = 0;
   8     var len = string.length;
   9     for (var index = 0; index < len; index++) {
  10         h = (((31 * h) | 0) + string.charCodeAt(index)) | 0;
  11     }
  12     return h;
  13 }
  14
  15 for (var i = 0; i < 10000; ++i) {
  16     var result =
  17         (stringHash("The spirit is willing but the flesh is weak.") *
  18          stringHash("The vodka is strong but the meat is rotten.")) | 0;
  19     if (result != -1136304128)
  20         throw "Bad result: " + result;
  21 }
  22