Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var foo = [];
    for (var x = 0; x < 1000; ++ x )
        foo.push( Math.random( ) );
    
    var y = 54.323;
    var y_inv = 1 / y;
    
    var i = 0;
    
  };
</script>

Test runner

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x[ i ++ % 1000 ] /= y;

x[ i ++ % 1000 ] *= y_inv;

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