Bob Nystrom
14011f47e3
They're back from the grave, and ready to party! Change-Id: I088134a9be7ecabf1fbf751c015a656a15cabff9 Reviewed-on: https://dart-review.googlesource.com/12821 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: William Hesse <whesse@google.com>
64 lines
1.6 KiB
Dart
64 lines
1.6 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
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import "package:expect/expect.dart";
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// Note: in --limit-ints-to-64-bits mode all integers are 64-bit already.
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// Still, it is harmless to apply _uint64Mask because (1 << 64) is 0 (all bits
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// are shifted out), so _uint64Mask is -1 (its bit pattern is 0xffffffffffffffff).
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const _uint64Mask = (1 << 64) - 1;
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constants() {
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Expect.equals(0, 499 >> 33);
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Expect.equals(0, (499 << 33) & 0xFFFFFFFF);
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Expect.equals(0, (499 << 32) >> 65);
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Expect.equals(0, ((499 << 32) << 65) & _uint64Mask);
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}
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foo(i) {
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if (i != 0) {
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y--;
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foo(i - 1);
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y++;
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}
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}
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var y;
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// id returns [x] in a way that should be difficult to predict statically.
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id(x) {
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y = x;
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foo(10);
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return y;
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}
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interceptors() {
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Expect.equals(0, id(499) >> 33);
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Expect.equals(0, (id(499) << 33) & 0xFFFFFFFF);
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Expect.equals(0, id(499 << 32) >> 65);
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Expect.equals(0, (id(499 << 32) << 65) & _uint64Mask);
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}
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speculative() {
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var a = id(499);
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var b = id(499 << 32);
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for (int i = 0; i < 1; i++) {
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Expect.equals(0, a >> 33);
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Expect.equals(0, (a << 33) & 0xFFFFFFFF);
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Expect.equals(0, b >> 65);
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Expect.equals(0, (b << 65) & _uint64Mask);
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}
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}
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// JavaScript shifts by the amount modulo 32. That is x << y is equivalent to
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// x << (y & 0x1F). Dart does not.
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main() {
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for (var i = 0; i < 10; ++i) {
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constants();
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interceptors();
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speculative();
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}
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}
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