v8/test/mjsunit/elements-kind-depends.js

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

function burn() {
  var a = new Array(3);
  a[0] = 10;
  a[1] = 15.5;
  a[2] = 20;
  return a;
}
%PrepareFunctionForOptimization(burn);

function check(a) {
  assertEquals(10, a[0]);
  assertEquals(15.5, a[1]);
  assertEquals(20, a[2]);
}

var b;
for (var i = 0; i < 3; ++i) {
  b = burn();
  check(b);  // all OK
}
%OptimizeFunctionOnNextCall(burn);
b = burn();
check(b);  // fails


function loop_test(x) {
  for (i=0;i<3;i++) {
    x[i] = (i+1) * 0.5;
  }
}
%PrepareFunctionForOptimization(loop_test);

function check2(b) {
  assertEquals(0.5, b[0]);
  assertEquals(1.0, b[1]);
  assertEquals(1.5, b[2]);
}

for (var i = 0; i < 3; ++i) {
  b = [0,1,2];
  loop_test(b);
  check2(b);
}
%OptimizeFunctionOnNextCall(loop_test);
b = [0,1,2];
loop_test(b);
check2(b);