mirror of https://github.com/tc39/test262.git
55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-atomics.sub
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description: Test Atomics.sub on arrays that allow atomic operations
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includes: [testAtomics.js, testTypedArray.js]
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features: [ArrayBuffer, arrow-function, Atomics, DataView, for-of, let, SharedArrayBuffer, TypedArray]
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---*/
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var sab = new SharedArrayBuffer(1024);
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var ab = new ArrayBuffer(16);
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var views = intArrayConstructors.slice();
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testWithTypedArrayConstructors(function(TA) {
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// Make it interesting - use non-zero byteOffsets and non-zero indexes.
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var view = new TA(sab, 32, 20);
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var control = new TA(ab, 0, 2);
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view[8] = 100;
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assert.sameValue(Atomics.sub(view, 8, 10), 100,
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"Subtract positive number");
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assert.sameValue(view[8], 90);
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assert.sameValue(Atomics.sub(view, 8, -5), 90,
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"Subtract negative number, though result remains positive");
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assert.sameValue(view[8], 95);
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view[3] = -5;
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control[0] = -5;
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assert.sameValue(Atomics.sub(view, 3, 0), control[0],
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"Result is negative and subject to coercion");
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control[0] = 12345;
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view[3] = 12345;
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assert.sameValue(Atomics.sub(view, 3, 0), control[0],
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"Result is subject to chopping");
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control[0] = 123456789;
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view[3] = 123456789;
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assert.sameValue(Atomics.sub(view, 3, 0), control[0],
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"Result is subject to chopping");
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// In-bounds boundary cases for indexing
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testWithAtomicsInBoundsIndices(function(IdxGen) {
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let Idx = IdxGen(view);
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view.fill(0);
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// Atomics.store() computes an index from Idx in the same way as other
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// Atomics operations, not quite like view[Idx].
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Atomics.store(view, Idx, 37);
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assert.sameValue(Atomics.sub(view, Idx, 0), 37);
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});
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}, views);
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