v8/test/mjsunit/smi-negative-zero.js

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// Ensure that operations on small integers handle -0.

var zero = 0;
var one = 1;
var minus_one = -1;
var two = 2;
var four = 4;
var minus_two = -2;
var minus_four = -4;

// variable op variable

assertEquals(-Infinity, one / (-zero), "one / -0 I");

assertEquals(-Infinity, one / (zero * minus_one), "one / -1");
assertEquals(-Infinity, one / (minus_one * zero), "one / -0 II");
assertEquals(Infinity, one / (zero * zero), "one / 0 I");
assertEquals(1, one / (minus_one * minus_one), "one / 1");

assertEquals(-Infinity, one / (zero / minus_one), "one / -0 III");
assertEquals(Infinity, one / (zero / one), "one / 0 II");

assertEquals(-Infinity, one / (minus_four % two), "foo1");
assertEquals(-Infinity, one / (minus_four % minus_two), "foo2");
assertEquals(Infinity, one / (four % two), "foo3");
assertEquals(Infinity, one / (four % minus_two), "foo4");

// literal op variable

assertEquals(-Infinity, one / (0 * minus_one), "bar1");
assertEquals(-Infinity, one / (-1 * zero), "bar2");
assertEquals(Infinity, one / (0 * zero), "bar3");
assertEquals(1, one / (-1 * minus_one), "bar4");

assertEquals(-Infinity, one / (0 / minus_one), "baz1");
assertEquals(Infinity, one / (0 / one), "baz2");

assertEquals(-Infinity, one / (-4 % two), "baz3");
assertEquals(-Infinity, one / (-4 % minus_two), "baz4");
assertEquals(Infinity, one / (4 % two), "baz5");
assertEquals(Infinity, one / (4 % minus_two), "baz6");

// variable op literal

assertEquals(-Infinity, one / (zero * -1), "fizz1");
assertEquals(-Infinity, one / (minus_one * 0), "fizz2");
assertEquals(Infinity, one / (zero * 0), "fizz3");
assertEquals(1, one / (minus_one * -1), "fizz4");

assertEquals(-Infinity, one / (zero / -1), "buzz1");
assertEquals(Infinity, one / (zero / 1), "buzz2");

assertEquals(-Infinity, one / (minus_four % 2), "buzz3");
assertEquals(-Infinity, one / (minus_four % -2), "buzz4");
assertEquals(Infinity, one / (four % 2), "buzz5");
assertEquals(Infinity, one / (four % -2), "buzz6");

// literal op literal

assertEquals(-Infinity, one / (-0), "fisk1");

assertEquals(-Infinity, one / (0 * -1), "fisk2");
assertEquals(-Infinity, one / (-1 * 0), "fisk3");
assertEquals(Infinity, one / (0 * 0), "fisk4");
assertEquals(1, one / (-1 * -1), "fisk5");

assertEquals(-Infinity, one / (0 / -1), "hest1");
assertEquals(Infinity, one / (0 / 1), "hest2");

assertEquals(-Infinity, one / (-4 % 2), "fiskhest1");
assertEquals(-Infinity, one / (-4 % -2), "fiskhest2");
assertEquals(Infinity, one / (4 % 2), "fiskhest3");
assertEquals(Infinity, one / (4 % -2), "fiskhest4");


// This tests against a singleton -0.0 object being overwritten.gc
x = 0;
z = 3044;

function foo(x) {
  var y = -x + z;
  return -x;
}

assertEquals(0, foo(x));
assertEquals(0, foo(x));