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function SameValue(x, y) {
if (x === y) {
return (x !== 0) || (1 / x === 1 / y);
}
return (x !== x && y !== y);
}
function* cartesian(a, b = a) {
for (var pa of a) {
for (var pb of b) {
yield [pa, pb];
}
}
}
var testValues = {
Double: `[-0.0, +0.0, 1.0, NaN]`,
Int32: `[-1, 0, 1, 2]`,
Value: `[-0.0, +0.0, "", NaN]`,
};
for (var [xs, ys] of cartesian(Object.values(testValues))) {
var fn = Function(`
var xs = ${xs};
var ys = ${ys};
assertEq(xs.length, 4);
assertEq(ys.length, 4);
// Compare each entry in xs with each entry in ys and ensure Object.is
// computes the same result as SameValue.
var actual = 0, expected = 0;
for (var i = 0; i < 1000; ++i) {
// 0 1 2 3
var xi = i & 3;
// 0 1 2 3 1 2 3 0 2 3 0 1 3 0 1 2
var yi = (i + ((i >> 2) & 3)) & 3;
actual += Object.is(xs[xi], ys[yi]) ? 1 : 0;
expected += SameValue(xs[xi], ys[yi]) ? 1 : 0;
}
assertEq(actual, expected);
`);
for (var i = 0; i < 3; ++i) {
fn();
}
}