blob: 1f0042387c1167ed66de3ea5565017b04003659d [file] [log] [blame]
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
import "package:expect/expect.dart";
constants() {
Expect.equals(0, 499 >> 33);
Expect.equals(0, (499 << 33) & 0xFFFFFFFF);
Expect.equals(0, (499 << 32) >> 65);
Expect.equals(0, (499 << 32) << 65);
}
foo(i) {
if (i != 0) {
y--;
foo(i - 1);
y++;
}
}
var y;
// id returns [x] in a way that should be difficult to predict statically.
id(x) {
y = x;
foo(10);
return y;
}
interceptors() {
Expect.equals(0, id(499) >> 33);
Expect.equals(0, (id(499) << 33) & 0xFFFFFFFF);
Expect.equals(0, id(499 << 32) >> 65);
Expect.equals(0, id(499 << 32) << 65);
}
speculative() {
var a = id(499);
var b = id(499 << 32);
for (int i = 0; i < 1; i++) {
Expect.equals(0, a >> 33);
Expect.equals(0, (a << 33) & 0xFFFFFFFF);
Expect.equals(0, b >> 65);
Expect.equals(0, b << 65);
}
}
// JavaScript shifts by the amount modulo 32. That is x << y is equivalent to
// x << (y & 0x1F). Dart does not.
main() {
for (var i = 0; i < 10; ++i) {
constants();
interceptors();
speculative();
}
}