test/mjsunit/regress/regress-crbug-309623.js

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// Flags: --allow-natives-syntax

var u = new Uint32Array(2);
u[0] = 1;
u[1] = 0xEE6B2800;

var a = [0, 1, 2];
a[0] = 0;  // Kill the COW.
assertTrue(%HasFastSmiElements(a));

function foo(i) {
  a[0] = u[i];
  return a[0];
}

assertEquals(u[0], foo(0));
assertEquals(u[0], foo(0));
%OptimizeFunctionOnNextCall(foo);
assertEquals(u[1], foo(1));