test/mjsunit/regress/regress-2537.js

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// Flags: --allow-natives-syntax

var large_int = 0x40000000;

function foo(x, expected) {
  assertEquals(expected, x);  // This succeeds.
  x += 0;  // Force int32 representation so that
           // CompareNumericAndBranch is used.
  if (3 != x) {
    x += 0;  // Poor man's "iDef".
    // Fails due to Smi-tagging without overflow check.
    assertEquals(expected, x);
  }
}

foo(1, 1);
foo(3, 3);
%OptimizeFunctionOnNextCall(foo);
foo(large_int, large_int);