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27 lines
770 B
JavaScript
27 lines
770 B
JavaScript
// Copyright 2018 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 --noalways-opt
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// Test that NumberModulus passes kIdentifiesZero to the
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// left hand side input when the result doesn't care about
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// 0 vs -0, even when the inputs are outside Signed32.
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(function() {
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function foo(x) {
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return (x * -2) % (2 ** 32) === 0;
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}
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assertFalse(foo(2));
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assertFalse(foo(1));
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%OptimizeFunctionOnNextCall(foo);
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assertFalse(foo(2));
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assertFalse(foo(1));
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// Now `foo` should stay optimized even if `x * -2` would
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// produce -0, aka when we pass a zero value for `x`.
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assertTrue(foo(0));
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assertOptimized(foo);
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})();
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