918fe04351
PR-URL: https://github.com/nodejs/node/pull/58070 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
41 lines
960 B
JavaScript
41 lines
960 B
JavaScript
// 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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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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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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%OptimizeMaglevOnNextCall(magnitude);
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magnitude(zero);
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// The first call immediately deopts
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assertFalse(isMaglevved(magnitude));
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// But we learn and don't deopt any more.
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%OptimizeMaglevOnNextCall(magnitude);
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magnitude(zero);
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assertTrue(isMaglevved(magnitude));
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// Also passing other old objects won't deopt.
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magnitude(anotherOldObject);
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assertTrue(isMaglevved(magnitude));
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