928da8091f
Tbr: nicohartmann@chromium.org Bug: chromium:1198705, chromium:1199345, chromium:1200490 Change-Id: I4a486df636e084279423e6cd3b867137bfe3fd6f Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2939984 Reviewed-by: Georg Neis <neis@chromium.org> Commit-Queue: Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#74945}
47 lines
1.0 KiB
JavaScript
47 lines
1.0 KiB
JavaScript
// Copyright 2021 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --opt --no-always-opt
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(function() {
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function foo(a) {
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var x = -0;
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if (a) {
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x = 0;
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}
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return x + (x - 0);
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals(0, foo(true));
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(-0, foo(false));
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})();
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// The following test already passed before the bugfix.
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(function() {
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function foo(a) {
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var x = 0;
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var y = -0;
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if (a == 42) x = 2**32 - 1;
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if (a == 0) {
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x = 0
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y = 1;
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}
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if (a == 2) x = -0;
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return x + y;
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals(1, foo(0));
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(0, foo(1));
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// We don't automatically deopt for y = -0 because (x + -0) can only become -0
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// for x = -0.
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assertOptimized(foo);
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assertEquals(-0, foo(2));
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assertUnoptimized(foo);
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})();
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