v8/test/mjsunit/regress/regress-1167.js

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// Flags: --allow-natives-syntax

// Deoptimization after a logical not in an effect context should not see a
// value for the logical not expression.
function test0(n) {
  var a = new Array(n);
  for (var i = 0; i < n; ++i) {
    // ~ of a non-numeric value is used to trigger deoptimization.
    a[i] = void !delete 'object' % ~delete 4;
  }
}

// OSR (after deoptimization) is used to observe the stack height mismatch.
for (var i = 0; i < 5; ++i) {
  for (var j = 1; j < 12; ++j) {
    test0(j * 1000);
  }
}


// Similar test with a different subexpression of unary !.
function test1(n) {
  var a = new Array(n);
  for (var i = 0; i < n; ++i) {
    a[i] = void !-'object' % ~delete 4;
  }
}

for (i = 0; i < 5; ++i) {
  for (j = 1; j < 12; ++j) {
    test1(j * 1000);
  }
}


// A similar issue, different subexpression of unary ! (e0 !== e1 is
// translated into !(e0 == e1)) and different effect context.
function side_effect() {}
function observe(x, y) {
  return x;
}
function test2(x) {
  return observe(
      this, (side_effect.observe <= side_effect.side_effect !== false, x + 1));
};
%PrepareFunctionForOptimization(test2);
for (var i = 0; i < 5; ++i) test2(0);
%OptimizeFunctionOnNextCall(test2);
test2(0);
test2(test2);