Stephen Adams
1eee3c7dc7
Within the [-2^31, 2^31) range it is faster to truncate and correct at boundaries than call Math.ceil/Math.floor. Each call to toInt() has been specialized to the calling operator (ceil, floor, ~/ etc). This makes the conversion faster (values are already integral) and lets us put the name of the operation and original operands in conversion errors, e.g (a / b).floor(); // b == 0 Unsupported operation: Infinity --> Unsupported operation: Infinity.floor() a ~/ b; // b == 0 Unsupported operation: Infinity --> Unsupported operation: Result of truncating division is Infinity: 132 ~/ 0 R=sigmund@google.com Review URL: https://codereview.chromium.org/1405113003 . Downside: an extra 400 bytes
83 lines
4.4 KiB
Dart
83 lines
4.4 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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import 'package:expect/expect.dart';
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main() {
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Expect.equals(0, 0.0.floor());
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Expect.equals(0, double.MIN_POSITIVE.floor());
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Expect.equals(0, (2.0 * double.MIN_POSITIVE).floor());
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Expect.equals(0, (1.18e-38).floor());
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Expect.equals(0, (1.18e-38 * 2).floor());
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Expect.equals(0, 0.49999999999999994.floor());
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Expect.equals(0, 0.5.floor());
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Expect.equals(0, 0.9999999999999999.floor());
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Expect.equals(1, 1.0.floor());
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Expect.equals(1, 1.000000000000001.floor());
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// The following numbers are on the border of 52 bits.
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// For example: 4503599627370499 + 0.5 => 4503599627370500.
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Expect.equals(4503599627370496, 4503599627370496.0.floor());
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Expect.equals(4503599627370497, 4503599627370497.0.floor());
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Expect.equals(4503599627370498, 4503599627370498.0.floor());
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Expect.equals(4503599627370499, 4503599627370499.0.floor());
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Expect.equals(9007199254740991, 9007199254740991.0.floor());
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Expect.equals(9007199254740992, 9007199254740992.0.floor());
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Expect.equals(179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368,
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double.MAX_FINITE.floor());
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Expect.equals(-1, (-double.MIN_POSITIVE).floor());
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Expect.equals(-1, (2.0 * -double.MIN_POSITIVE).floor());
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Expect.equals(-1, (-1.18e-38).floor());
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Expect.equals(-1, (-1.18e-38 * 2).floor());
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Expect.equals(-1, (-0.49999999999999994).floor());
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Expect.equals(-1, (-0.5).floor());
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Expect.equals(-1, (-0.9999999999999999).floor());
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Expect.equals(-1, (-1.0).floor());
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Expect.equals(-2, (-1.000000000000001).floor());
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Expect.equals(-4503599627370496, (-4503599627370496.0).floor());
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Expect.equals(-4503599627370497, (-4503599627370497.0).floor());
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Expect.equals(-4503599627370498, (-4503599627370498.0).floor());
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Expect.equals(-4503599627370499, (-4503599627370499.0).floor());
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Expect.equals(-9007199254740991, (-9007199254740991.0).floor());
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Expect.equals(-9007199254740992, (-9007199254740992.0).floor());
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Expect.equals(-179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368,
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(-double.MAX_FINITE).floor());
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Expect.isTrue(0.0.floor() is int);
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Expect.isTrue(double.MIN_POSITIVE.floor() is int);
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Expect.isTrue((2.0 * double.MIN_POSITIVE).floor() is int);
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Expect.isTrue((1.18e-38).floor() is int);
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Expect.isTrue((1.18e-38 * 2).floor() is int);
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Expect.isTrue(0.49999999999999994.floor() is int);
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Expect.isTrue(0.5.floor() is int);
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Expect.isTrue(0.9999999999999999.floor() is int);
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Expect.isTrue(1.0.floor() is int);
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Expect.isTrue(1.000000000000001.floor() is int);
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Expect.isTrue(4503599627370496.0.floor() is int);
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Expect.isTrue(4503599627370497.0.floor() is int);
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Expect.isTrue(4503599627370498.0.floor() is int);
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Expect.isTrue(4503599627370499.0.floor() is int);
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Expect.isTrue(9007199254740991.0.floor() is int);
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Expect.isTrue(9007199254740992.0.floor() is int);
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Expect.isTrue(double.MAX_FINITE.floor() is int);
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Expect.isTrue((-double.MIN_POSITIVE).floor() is int);
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Expect.isTrue((2.0 * -double.MIN_POSITIVE).floor() is int);
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Expect.isTrue((-1.18e-38).floor() is int);
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Expect.isTrue((-1.18e-38 * 2).floor() is int);
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Expect.isTrue((-0.49999999999999994).floor() is int);
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Expect.isTrue((-0.5).floor() is int);
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Expect.isTrue((-0.9999999999999999).floor() is int);
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Expect.isTrue((-1.0).floor() is int);
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Expect.isTrue((-1.000000000000001).floor() is int);
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Expect.isTrue((-4503599627370496.0).floor() is int);
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Expect.isTrue((-4503599627370497.0).floor() is int);
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Expect.isTrue((-4503599627370498.0).floor() is int);
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Expect.isTrue((-4503599627370499.0).floor() is int);
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Expect.isTrue((-9007199254740991.0).floor() is int);
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Expect.isTrue((-9007199254740992.0).floor() is int);
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Expect.isTrue((-double.MAX_FINITE).floor() is int);
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}
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