third_party/v8/test/mjsunit/transition-elements-kind.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax

// Allocation site for empty double arrays.
function foo() {
  return new Array();
}
var a = foo();
a[0] = 1.1;

// Emit a TransitionElementsKindStub which transitions from double to object.
function store(a, x) {
  a[0] = x;
};
%PrepareFunctionForOptimization(store);
store([1.1], 'a');
store([1.1], 1.1);
%OptimizeFunctionOnNextCall(store);

// Use the TransitionElementsKindStub to transition from double to object.
var b = foo();
store(b, 'a');