v8/test/mjsunit/compiler/regress-loadfield.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// Flags: --allow-natives-syntax

// Regression test for GVN on field loads.

function bar() {}

// Make sure there is a transition on adding "bar" inobject property.
var b = new bar();
b.bar = "bar";

function test(a) {
  var b = new Array(10);
  for (var i = 0; i < 10; i++) {
    b[i] = new bar();
  }

  for (var i = 0; i < 10; i++) {
    b[i].bar = a.foo;
  }
}

%PrepareFunctionForOptimization(test);

// Create an object with fast backing store properties.
var a = {};
a.p1 = "";
a.p2 = "";
a.p3 = "";
a.p4 = "";
a.p5 = "";
a.p6 = "";
a.p7 = "";
a.p8 = "";
a.p9 = "";
a.p10 = "";
a.p11 = "";
a.foo = "foo";
for (var i = 0; i < 5; i++) {
 test(a);
}
%OptimizeFunctionOnNextCall(test);
test(a);

test("");