v8/test/mjsunit/compiler/compare-objeq-elim.js

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// modification, are permitted provided that the following conditions are
// met:
//
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// Flags: --allow-natives-syntax --check-elimination

function A(x, y) {
  this.x = x;
  this.y = y;
}

function B(x, y) {
  this.x = x;
  this.y = y;
}

function F1(a, b) {
  if (a == b) return a.x;
  else return b.x;
}

function F2(a, b) {
  if (a == b) return a.x;
  else return b.x;
}

function F3(a, b) {
  var f = a.y;
  if (a == b) return a.x;
  else return b.x;
}

function F4(a, b) {
  var f = b.y;
  if (a == b) return a.x;
  else return b.x;
}

%NeverOptimizeFunction(test);

function test(f, a, b) {
  f(a, a);
  f(a, b);
  f(b, a);
  f(b, c);
  f(b, b);
  f(c, c);

  %OptimizeFunctionOnNextCall(f)

  assertEquals(a.x, f(a, a));
  assertEquals(b.x, f(b, b));
}

var a = new A(3, 5);
var b = new B(2, 6);
var c = new A(1, 7);

test(F1, a, c);
test(F2, a, b);
test(F3, a, b);
test(F4, a, b);