JSTests/microbenchmarks/Int8Array-load-with-byteLength.js

   1 // Test the performance of Int8Array by implementing Adler32.
   2
   3 function adler32(array)
   4 {
   5     var MOD_ADLER = 65521;
   6     var a = 1;
   7     var b = 0;
   8     var index;
   9
  10     /* Process each byte of the data in order */
  11     for (index = 0; index < array.byteLength; ++index)
  12     {
  13         a = (a + array[index]) % MOD_ADLER;
  14         b = (b + a) % MOD_ADLER;
  15     }
  16
  17     return (b << 16) | a;
  18 }
  19
  20 var array = new Int8Array(1000);
  21 for (var i = 0; i < array.byteLength ; ++i)
  22     array[i] = i;
  23
  24 var result = 0;
  25 for (var i = 0; i < 300; ++i)
  26     result += adler32(array);
  27
  28 if (result != -63300)
  29     throw "Bad result: " + result;