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e31f0a7d25
PR-URL: https://github.com/nodejs/node/pull/28918 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>
61 lines
1.3 KiB
JavaScript
61 lines
1.3 KiB
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 --opt --no-always-opt --no-stress-flush-bytecode
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// Check that there are no deopt loops for DataView methods.
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var buffer = new ArrayBuffer(64);
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var dataview = new DataView(buffer, 8, 24);
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// Check DataView getters.
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function readUint8(offset) {
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return dataview.getUint8(offset);
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}
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function warmupRead(f) {
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%PrepareFunctionForOptimization(f);
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f(0);
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f(1);
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%OptimizeFunctionOnNextCall(f);
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f(2);
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f(3);
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}
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warmupRead(readUint8);
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assertOptimized(readUint8);
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readUint8(0.5); // Deopts.
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assertUnoptimized(readUint8);
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warmupRead(readUint8);
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assertOptimized(readUint8);
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readUint8(1.5); // Doesn't deopt because getUint8 didn't get inlined this time.
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assertOptimized(readUint8);
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// Check DataView setters.
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function writeUint8(offset, value) {
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dataview.setUint8(offset, value);
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}
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function warmupWrite(f) {
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%PrepareFunctionForOptimization(f);
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f(0, 0);
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f(0, 1);
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%OptimizeFunctionOnNextCall(f);
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f(0, 2);
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f(0, 3);
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}
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warmupWrite(writeUint8);
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assertOptimized(writeUint8);
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writeUint8(0.5, 0); // Deopts.
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assertUnoptimized(writeUint8);
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warmupWrite(writeUint8);
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assertOptimized(writeUint8);
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writeUint8(1.5, 0); // Doesn't deopt.
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assertOptimized(writeUint8);
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