29 lines
811 B
JavaScript
29 lines
811 B
JavaScript
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// Copyright 2023 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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//
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// Flags: --allow-natives-syntax --maglev
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function foo(a, b) {
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// Write to a.x, which will also cache the value in a.x
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a.x = 7;
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// This write should be cached here.
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const x = a.x;
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// a might alias b, so we should clear the cached value here...
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b.x = 4;
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// ... and return the old and uncached new value here (which is 4 if a aliases
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// b, 7 otherwise).
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const y = a.x;
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return [x, y];
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}
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const a = {x: 1};
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const b = {x: 2};
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%PrepareFunctionForOptimization(foo);
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assertEquals([7,4], foo(a, a));
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assertEquals([7,7], foo(a, b));
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%OptimizeMaglevOnNextCall(foo);
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assertEquals([7,4], foo(a, a));
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assertEquals([7,7], foo(a, b));
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