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a4d799c402
Note that cast_test.dart isn't migrated yet due to #39517. First patch set is just copying the tests over. The second patchset has the actual meaningful changes. Change-Id: I89233f20187b4305a776f865cde09a984423fa4f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/125920 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
185 lines
5.3 KiB
Dart
185 lines
5.3 KiB
Dart
// Copyright (c) 2013, 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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// Testing int.bitLength, int.toUnsigned and int.toSigned.
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library bit_twiddling_test;
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import "package:expect/expect.dart";
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testBitLength() {
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check(int i, width) {
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Expect.equals(width, i.bitLength, '$i.bitLength == $width');
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// (~i) written as (-i-1) to avoid issues with limited range of dart2js ops.
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Expect.equals(width, (-i - 1).bitLength, '(~$i).bitLength == $width');
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}
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check(0, 0);
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check(1, 1);
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check(2, 2);
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check(3, 2);
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check(4, 3);
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check(5, 3);
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check(6, 3);
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check(7, 3);
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check(8, 4);
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check(127, 7);
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check(128, 8);
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check(129, 8);
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check(2147483646, 31);
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check(2147483647, 31);
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check(2147483648, 32);
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check(2147483649, 32);
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check(4294967295, 32);
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check(4294967296, 33);
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check(0xffffffffff, 40);
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check(0xfffffffffff, 44);
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check(0xffffffffffff, 48);
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check(0x1000000000000, 49);
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check(0x1000000000001, 49);
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check(0x1ffffffffffff, 49);
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check(0x2000000000000, 50);
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check(0x2000000000001, 50);
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check(0xffffffffffffff, 56); // //# int64: ok
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check(0x7fffffffffffffff, 63); // //# int64: continued
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check(0xffffffffffffffff, 0); // //# int64: continued
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}
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testToUnsigned() {
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checkU(src, width, expected) {
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Expect.equals(expected, src.toUnsigned(width));
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}
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checkU(1, 8, 1);
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checkU(0xff, 8, 0xff);
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checkU(0xffff, 8, 0xff);
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checkU(-1, 8, 0xff);
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checkU(0xffffffff, 32, 0xffffffff);
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checkU(0x7fffffff, 30, 0x3fffffff);
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checkU(0x7fffffff, 31, 0x7fffffff);
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checkU(0x7fffffff, 32, 0x7fffffff);
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checkU(0x80000000, 30, 0);
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checkU(0x80000000, 31, 0);
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checkU(0x80000000, 32, 0x80000000);
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checkU(0xffffffff, 30, 0x3fffffff);
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checkU(0xffffffff, 31, 0x7fffffff);
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checkU(0xffffffff, 32, 0xffffffff);
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checkU(0x100000000, 30, 0);
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checkU(0x100000000, 31, 0);
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checkU(0x100000000, 32, 0);
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checkU(0x1ffffffff, 30, 0x3fffffff);
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checkU(0x1ffffffff, 31, 0x7fffffff);
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checkU(0x1ffffffff, 32, 0xffffffff);
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checkU(-1, 0, 0);
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checkU(0, 0, 0);
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checkU(1, 0, 0);
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checkU(2, 0, 0);
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checkU(3, 0, 0);
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checkU(-1, 1, 1);
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checkU(0, 1, 0);
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checkU(1, 1, 1);
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checkU(2, 1, 0);
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checkU(3, 1, 1);
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checkU(4, 1, 0);
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checkU(-1, 2, 3);
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checkU(0, 2, 0);
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checkU(1, 2, 1);
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checkU(2, 2, 2);
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checkU(3, 2, 3);
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checkU(4, 2, 0);
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checkU(-1, 3, 7);
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checkU(0, 3, 0);
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checkU(1, 3, 1);
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checkU(2, 3, 2);
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checkU(3, 3, 3);
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checkU(4, 3, 4);
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checkU(0x0100000000000001, 2, 1); // //# int64: continued
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checkU(0x0200000000000001, 60, 0x200000000000001); // //# int64: continued
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checkU(0x0200000000000001, 59, 0x200000000000001); // //# int64: continued
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checkU(0x0200000000000001, 58, 0x200000000000001); // //# int64: continued
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checkU(0x0200000000000001, 57, 1); // //# int64: continued
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checkU(0x8100000000000001, 2, 1); // //# int64: continued
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checkU(0x8200000000000001, 60, 0x200000000000001); // //# int64: continued
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checkU(0x8200000000000001, 59, 0x200000000000001); // //# int64: continued
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checkU(0x8200000000000001, 58, 0x200000000000001); // //# int64: continued
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checkU(0x8200000000000001, 57, 1); // //# int64: continued
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}
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testToSigned() {
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checkS(src, width, expected) {
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Expect.equals(
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expected, src.toSigned(width), '$src.toSigned($width) == $expected');
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}
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checkS(1, 8, 1);
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checkS(0xff, 8, -1);
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checkS(0xffff, 8, -1);
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checkS(-1, 8, -1);
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checkS(128, 8, -128);
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checkS(0xffffffff, 32, -1);
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checkS(0x7fffffff, 30, -1);
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checkS(0x7fffffff, 31, -1);
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checkS(0x7fffffff, 32, 0x7fffffff);
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checkS(0x80000000, 30, 0);
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checkS(0x80000000, 31, 0);
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checkS(0x80000000, 32, -2147483648);
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checkS(0xffffffff, 30, -1);
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checkS(0xffffffff, 31, -1);
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checkS(0xffffffff, 32, -1);
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checkS(0x100000000, 30, 0);
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checkS(0x100000000, 31, 0);
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checkS(0x100000000, 32, 0);
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checkS(0x1ffffffff, 30, -1);
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checkS(0x1ffffffff, 31, -1);
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checkS(0x1ffffffff, 32, -1);
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checkS(-1, 1, -1);
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checkS(0, 1, 0);
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checkS(1, 1, -1); // The only bit is the sign bit.
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checkS(2, 1, 0);
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checkS(3, 1, -1);
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checkS(4, 1, 0);
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checkS(-1, 2, -1);
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checkS(0, 2, 0);
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checkS(1, 2, 1);
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checkS(2, 2, -2);
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checkS(3, 2, -1);
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checkS(4, 2, 0);
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checkS(-1, 3, -1);
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checkS(0, 3, 0);
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checkS(1, 3, 1);
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checkS(2, 3, 2);
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checkS(3, 3, 3);
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checkS(4, 3, -4);
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checkS(0x0100000000000001, 2, 1); // //# int64: continued
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checkS(0x0200000000000001, 60, 0x200000000000001); // //# int64: continued
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checkS(0x0200000000000001, 59, 0x200000000000001); // //# int64: continued
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checkS(0x0200000000000001, 58, -0x200000000000000 + 1); // //# int64: continued
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checkS(0x0200000000000001, 57, 1); // //# int64: continued
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checkS(0x8100000000000001, 2, 1); // //# int64: continued
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checkS(0x8200000000000001, 60, 0x200000000000001); // //# int64: continued
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checkS(0x8200000000000001, 59, 0x200000000000001); // //# int64: continued
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checkS(0x8200000000000001, 58, -0x200000000000000 + 1); // //# int64: continued
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checkS(0x8200000000000001, 57, 1); // //# int64: continued
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}
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main() {
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testBitLength();
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testToUnsigned();
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testToSigned();
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}
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