mirror of
https://github.com/dart-lang/sdk
synced 2024-09-18 21:51:18 +00:00
24b33dae89
Change-Id: I90bc5ff6aae8998deb3cc28b1134c60058706f01 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150185 Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Srujan Gaddam <srujzs@google.com> Commit-Queue: Bob Nystrom <rnystrom@google.com>
59 lines
1.3 KiB
Dart
59 lines
1.3 KiB
Dart
// 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();
|
|
}
|
|
}
|