src/third_party/mozjs-45/js/src/jit-test/tests/ion/getelem-bounds-coalesce.js

var a = [1,2,3,4];

// Basic constants.
function foo(x) {
  return x[0] + x[1] + x[2] + x[3];
}
for (var i = 0; i < 100; i++)
  assertEq(foo(a), 10);
assertEq(foo([1,2,3]), NaN);

// Basic terms.
function foo2(x, n) {
  return x[n] + x[n + 1] + x[n + 2];
}
for (var i = 0; i < 100; i++)
  assertEq(foo2(a, 1), 9);
assertEq(foo2(a, 2), NaN);

// Term underflow.
function foo3(x, n) {
  return x[n] + x[n + 1] + x[n + 2];
}
for (var i = 0; i < 100; i++)
  assertEq(foo3(a, 1), 9);
assertEq(foo3(a, -1), NaN);

// Integer overflow computing bound.
function foo4(x, n) {
  return x[n] + x[n + 1] + x[n + 2];
}
for (var i = 0; i < 45; i++)
  assertEq(foo4(a, 1), 9);
assertEq(foo4(a, 0x7fffffff), NaN);

// Underflow at an offset.
function foo5(x, n) {
  return x[n + 10] + x[n + 11] + x[n + 12];
}
for (var i = 0; i < 45; i++)
  assertEq(foo5(a, -9), 9);
assertEq(foo5(a, -11), NaN);

// Overflow at offset.
function foo6(x, n) {
  return x[n - 10] + x[n - 11] + x[n - 12];
}
for (var i = 0; i < 45; i++)
  assertEq(foo6(a, 13), 9);
assertEq(foo6(a, 14), NaN);