17a74ddd3d
PR-URL: https://github.com/nodejs/node/pull/49639 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
30 lines
815 B
JavaScript
30 lines
815 B
JavaScript
// 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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let ab = new ArrayBuffer(4);
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let dv = new DataView(ab);
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const kA = 0x01_80;
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const kB = 0xFF_FF_FF_7F | 0; // sign-extended 0xFF_7F
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// Explicitly write the big-endian int16 representations
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// of these values into the buffer:
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dv.setInt8(0, 0x01, false);
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dv.setInt8(1, 0x80, false);
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dv.setInt8(2, 0xFF, false);
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dv.setInt8(3, 0x7F, false);
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function f(dv, index) {
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return dv.getInt16(index, false); // big-endian read.
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}
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%PrepareFunctionForOptimization(f);
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assertEquals(kA, f(dv, 0));
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assertEquals(kB, f(dv, 2));
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%OptimizeMaglevOnNextCall(f);
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assertEquals(kA, f(dv, 0));
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assertEquals(kB, f(dv, 2));
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