src/v8/test/mjsunit/compiler/regress-shared-deopt.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
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//
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// Flags: --allow-natives-syntax

var soft = false;

// disable optimization of this global
soft = true;
soft = false;
soft = true;
soft = false;

function test() {
  var f4 = makeF(4);
  var f5 = makeF(5);

  function makeF(i) {
    return function f(x) {
      if (x == 0) return i;
      if (i == 4) if (soft) print("wahoo" + i);
      return f4(x - 1);
    }
  }

  %PrepareFunctionForOptimization(f4);
  f4(9);
  f4(11);
  %OptimizeFunctionOnNextCall(f4);
  f4(12);

  %PrepareFunctionForOptimization(f5);
  f5(9);
  f5(11);
  %OptimizeFunctionOnNextCall(f5);
  f5(12);

  soft = true;
  f4(1);
  f5(9);
}

test();