dc302c74be
- Removes shared InnerArrayCopyWithin JS builtin from src/js/array.js - Implements %TypedArray%.prototype.copyWithin as a C++ builtin, which relies on std::memmove rather than accessing individual eleements. - Fixes the case where copyWithin is invoked on a TypedArray with a detached buffer. - Add tests to ensure that +/-Infinity (for all 3 parameters) is handled correctly by the algorithm The C++ version gets through the benchmark more than 25000 times as quickly as the JS implementation. BUG=v8:5925, v8:5929, v8:4648 R=cbruni@chromium.org, adamk@chromium.org, littledan@chromium.org Review-Url: https://codereview.chromium.org/2697593002 Cr-Commit-Position: refs/heads/master@{#43213}
15 lines
402 B
JavaScript
15 lines
402 B
JavaScript
// Copyright 2017 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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var buf = new ArrayBuffer(0x10000);
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var arr = new Uint8Array(buf).fill(55);
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var tmp = {};
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tmp[Symbol.toPrimitive] = function () {
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%ArrayBufferNeuter(arr.buffer);
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return 50;
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}
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arr.copyWithin(tmp);
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