test/mjsunit/regress/regress-1257.js

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//
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function g(y) { assertEquals(y, 12); }

var X = 0;

function foo () {
  var cnt = 0;
  var l = -1;
  var x = 0;
  while (1) switch (l) {
      case -1:
        var y = x + 12;
        l = 0;
        break;
      case 0:
        // Loop for to hit OSR.
        if (cnt++ < 10000000) {
          l = 0;
          break;
        } else {
          l = 1;
          break;
        }
      case 1:
        // This case will contain deoptimization
        // because it has no type feedback.
        g(y);
        return;
    };
}

foo();