v8/test/mjsunit/compiler/regress-rep-change.js

// Copyright 2010 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 the case where a phi has two input operands with
// the same value.

function test(start) {
  if (true) {
    for (var i = start; i < 10; i++) { }
  }
  for (var i = start; i < 10; i++) { }
}

var n = 3;

for (var i = 0; i < n; ++i) {
  test(0);
}

%OptimizeFunctionOnNextCall(test);
test(0);