36 lines
1.0 KiB
JavaScript
36 lines
1.0 KiB
JavaScript
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// Copyright 2015 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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function boom(a1, a2) {
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// Do something with a2 that needs a map check (for DOUBLE_ELEMENTS).
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var s = a2[0];
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// Emit a load that transitions a1 to FAST_ELEMENTS.
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var t = a1[0];
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// Emit a store to a2 that assumes DOUBLE_ELEMENTS.
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// The map check is considered redundant and will be eliminated.
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a2[0] = 0.3;
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}
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// Prepare type feedback for the "t = a1[0]" load: fast elements.
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var fast_elem = new Array(1);
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fast_elem[0] = "tagged";
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boom(fast_elem, [1]);
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// Prepare type feedback for the "a2[0] = 0.3" store: double elements.
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var double_elem = new Array(1);
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double_elem[0] = 0.1;
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boom(double_elem, double_elem);
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// Reset |double_elem| and go have a party.
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double_elem = new Array(10);
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double_elem[0] = 0.1;
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%OptimizeFunctionOnNextCall(boom);
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boom(double_elem, double_elem);
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assertEquals(0.3, double_elem[0]);
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assertEquals(undefined, double_elem[1]);
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