Ben Konyi
192579020c
Bug: Change-Id: I194436597ba39b2e2b872fb58b77314ab925b3aa Reviewed-on: https://dart-review.googlesource.com/7080 Commit-Queue: Ben Konyi <bkonyi@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>
48 lines
1.5 KiB
Dart
48 lines
1.5 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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// Regression test for dart2js, whose value range analysis phase
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// assumed loop phis that were integer necessarily had integer inputs.
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var array = const [0, 0.5];
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var globalB = array[0];
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var otherArray = [5];
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main() {
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var b = globalB;
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var a = b + 1;
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if (otherArray[0] == 0) {
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// Use a non-existing selector to prevent adding a bailout check.
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(a as dynamic).noSuch();
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a = otherArray[0];
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}
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// Use [a] to make sure it does not become dead code.
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var f = array[a];
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// Add an integer check on [b].
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var d = array[b];
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// This instruction will be GVN to the same value as [a].
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// By being GVN'ed, [e] will have its type changed from integer
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// to number: because of the int type check on [b], we know
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// [: b + 1 :] returns an integer.
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// However we update this instruction with the previous [: b + 1 :]
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// that did not have that information and therefore only knows that
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// the instruction returns a number.
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var e = b + 1;
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// Introduce a loop phi that has [e] as header input, and [e++] as
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// update input. By having [e] as input, dart2js will compute an
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// integer type for the phi. However, after GVN, [e] becomes a
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// number.
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while (otherArray[0] == 0) {
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// Use [e] as an index for an array so that the value range
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// analysis tries to compute a range for [e].
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otherArray[e] = d + f;
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e++;
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}
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}
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