Gabriel Terwesten
73b7d0c40a
This is a reland of commite2d6cb69fbOriginal change's description: > Reland "[vm/compiler] Optimize switch statements" > > This is a reland of commitf5228127f8> > Original change's description: > > [vm/compiler] Optimize switch statements > > > > Switch statements that either contain only integers or only enum values of the same type can be optimized. > > > > Depending on the number of switch expressions and the number of holes that the range of switch expressions contains, either a binary search or a jump table is used. > > > > TEST=runtime/test/vm/dart{,_2}/optimized_switch > > TEST=tests/language{,_2}/switch > > > > Fixes: https://github.com/dart-lang/sdk/issues/49585 > > > > Co-authored-by: Gabriel Terwesten gabriel@terwesten.net > > > > Change-Id: I62dcdb7843107f03de7e468c60b4db52ec78f676 > > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/253787 > > Reviewed-by: Alexander Markov <alexmarkov@google.com> > > Commit-Queue: Alexander Markov <alexmarkov@google.com> > > TEST=runtime/test/vm/dart{,_2}/optimized_switch > TEST=tests/language{,_2}/switch > > Change-Id: Ie96e5ff41dce33e2425ba9ad15ecd931d09bec6e > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/255700 > Reviewed-by: Alexander Markov <alexmarkov@google.com> > Commit-Queue: Alexander Markov <alexmarkov@google.com> TEST=runtime/test/vm/dart{,_2}/optimized_switch TEST=tests/language{,_2}/switch Change-Id: I56f8d25a88bb856115550c5da3f02c80c7547802 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/256180 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
39 lines
1.0 KiB
Dart
39 lines
1.0 KiB
Dart
// TODO(multitest): This was automatically migrated from a multitest and may
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// contain strange or dead code.
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// Copyright (c) 2011, 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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// Check that FallThroughError is thrown if switch clause does not terminate.
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// VMOptions=
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// VMOptions=--force-switch-dispatch-type=0
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// VMOptions=--force-switch-dispatch-type=1
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// VMOptions=--force-switch-dispatch-type=2
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import "package:expect/expect.dart";
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String test(int n) {
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String result = "foo";
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switch (n) {
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case 0:
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result = "zero";
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break;
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case 1:
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// fall-through, error if case is non-empty
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case 9:
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result = "nine";
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// No implicit FallThroughError at end of switch statement.
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}
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return result;
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}
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main() {
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Expect.equals("zero", test(0));
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Expect.equals("nine", test(1));
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Expect.equals("nine", test(9));
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Expect.equals("foo", test(99));
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}
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