test/mjsunit/compiler/regress-lazy-deopt.js

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// Flags: --allow-natives-syntax

// Test lazy deoptimization after CallFunctionStub.

function foo() { return 1; }

function f(x, y) {
  var a = [0];
  if (x == 0) {
    %DeoptimizeFunction(f);
    return 1;
  }
  a[0] = %_CallFunction(null, x - 1, f);
  return x >> a[0];
}

f(42);
f(42);
assertEquals(42, f(42));
%OptimizeFunctionOnNextCall(f);
assertEquals(42, f(42));