37 lines
888 B
JavaScript
37 lines
888 B
JavaScript
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// Copyright 2024 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 --maglev --no-always-turbofan
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// Flags: --turbofan --turbolev
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class Vector {
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constructor(x) {
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this.x = x;
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}
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}
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function magnitude(v) {
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return v.x;
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}
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const zero = new Vector(0); // Map1
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const anotherOldObject = new Vector(0); // Map1
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%PrepareFunctionForOptimization(magnitude);
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magnitude(zero);
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// Make the feedback polymorphic with an unrelated map.
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const unrelated = {a: 0, b: 0, c: 0, x: 0};
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magnitude(unrelated);
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const nonzero = new Vector(0.6); // Map2
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// Map1 is now deprecated but Map2 is not a migration target.
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%OptimizeFunctionOnNextCall(magnitude);
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magnitude(nonzero);
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// The first call doesn't deopt if called with a new object.
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assertOptimized(magnitude);
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