tests/language_2/vm/bitnot_int_test.dart

// Copyright (c) 2019, 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.

// @dart = 2.9

// VMOptions=--no_background_compilation --optimization_counter_threshold=10

import "package:expect/expect.dart";

// Tests for long bit-not under 64-bit arithmetic wrap-around semantics.

final int maxInt32 = 2147483647;
final int minInt32 = -2147483648;
final int maxInt64 = 0x7fffffffffffffff;
final int minInt64 = 0x8000000000000000;

int bitnot(int x) {
  return ~x;
}

doConstant() {
  Expect.equals(0, bitnot(-1));
  Expect.equals(-1, bitnot(0));
  Expect.equals(-2, bitnot(1));

  Expect.equals(minInt32, bitnot(maxInt32));
  Expect.equals(maxInt32, bitnot(minInt32));
  Expect.equals(minInt64, bitnot(maxInt64));
  Expect.equals(maxInt64, bitnot(minInt64)); // sic!
}

doVar() {
  int d = 0;
  for (int i = -88; i < 10; i++) {
    d += bitnot(i);
  }
  Expect.equals(3773, d);
}

main() {
  // Repeat tests to enter JIT (when applicable).
  for (int i = 0; i < 20; i++) {
    doConstant();
    doVar();
  }
}