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28 lines
809 B
JavaScript
28 lines
809 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
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// We need a SpeculativeNumberAdd with Number feedback.
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function bar(x) { return x + x; }
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bar(0.1);
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// We also need an indirection via an object field such
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// that only after escape analysis TurboFan can figure
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// out that the value `y` is actually a Number in the
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// safe integer range.
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function baz(y) { return {y}; }
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baz(null); baz(0);
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// Now we can put all of that together to get a kRepBit
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// use of a kWord64 value (on 64-bit architectures).
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function foo(o) {
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return !baz(bar(o.x)).y;
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}
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assertFalse(foo({x:1}));
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assertFalse(foo({x:1}));
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%OptimizeFunctionOnNextCall(foo);
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assertFalse(foo({x:1}));
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