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Diffstat (limited to 'test/built-ins/Atomics/sub/good-views.js')
-rw-r--r-- | test/built-ins/Atomics/sub/good-views.js | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/test/built-ins/Atomics/sub/good-views.js b/test/built-ins/Atomics/sub/good-views.js new file mode 100644 index 000000000..cdbe4b22c --- /dev/null +++ b/test/built-ins/Atomics/sub/good-views.js @@ -0,0 +1,53 @@ +// Copyright (C) 2017 Mozilla Corporation. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +description: Test Atomics.sub on arrays that allow atomic operations +includes: [testAtomics.js, testTypedArray.js] +---*/ + +var sab = new SharedArrayBuffer(1024); +var ab = new ArrayBuffer(16); + +var int_views = [Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array]; + +testWithTypedArrayConstructors(function(View) { + // Make it interesting - use non-zero byteOffsets and non-zero indexes. + + var view = new View(sab, 32, 20); + var control = new View(ab, 0, 2); + + view[8] = 100; + assert.sameValue(Atomics.sub(view, 8, 10), 100, + "Subtract positive number"); + assert.sameValue(view[8], 90); + + assert.sameValue(Atomics.sub(view, 8, -5), 90, + "Subtract negative number, though result remains positive"); + assert.sameValue(view[8], 95); + + view[3] = -5; + control[0] = -5; + assert.sameValue(Atomics.sub(view, 3, 0), control[0], + "Result is negative and subject to coercion"); + + control[0] = 12345; + view[3] = 12345; + assert.sameValue(Atomics.sub(view, 3, 0), control[0], + "Result is subject to chopping"); + + control[0] = 123456789; + view[3] = 123456789; + assert.sameValue(Atomics.sub(view, 3, 0), control[0], + "Result is subject to chopping"); + + // In-bounds boundary cases for indexing + testWithAtomicsInBoundsIndices(function(IdxGen) { + let Idx = IdxGen(view); + view.fill(0); + // Atomics.store() computes an index from Idx in the same way as other + // Atomics operations, not quite like view[Idx]. + Atomics.store(view, Idx, 37); + assert.sameValue(Atomics.sub(view, Idx, 0), 37); + }); +}, int_views); |