test/mjsunit/regress/regress-2326.js

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// This tests that we do not share optimized code across closures that
// were optimized using OSR (for a particular OSR entry AST id) even if
// caching of optimized code kicks in.

function makeClosure() {
  function f(mode, iterations) {
    var accumulator = 0;
    if (mode == 1) {
      while (--iterations > 0) accumulator = Math.ceil(accumulator);
      return 1;
    } else {
      while (--iterations > 0) accumulator = Math.floor(accumulator);
      return 2;
    }
  }
  return f;
}

// Generate two closures sharing the same underlying function literal.
var f1 = makeClosure();
var f2 = makeClosure();

// This function should be optimized via OSR in the first tight loop.
assertSame(1, f1(1, 100000));

// This function should be optimized via OSR in the second tight loop.
assertSame(2, f2(2, 100000));