good-views.js (2295B)
1 // |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics 2 // Copyright (C) 2018 Rick Waldron. All rights reserved. 3 // This code is governed by the BSD license found in the LICENSE file. 4 /*--- 5 esid: sec-atomics.sub 6 description: Test Atomics.sub on arrays that allow atomic operations 7 includes: [testAtomics.js, testBigIntTypedArray.js] 8 features: [ArrayBuffer, Atomics, BigInt, DataView, SharedArrayBuffer, Symbol, TypedArray] 9 ---*/ 10 // Make it interesting - use non-zero byteOffsets and non-zero indexes. 11 // In-bounds boundary cases for indexing 12 // Atomics.store() computes an index from Idx in the same way as other 13 // Atomics operations, not quite like view[Idx]. 14 const sab = new SharedArrayBuffer(1024); 15 const ab = new ArrayBuffer(BigInt64Array.BYTES_PER_ELEMENT * 2); 16 17 testWithBigIntTypedArrayConstructors(function(TA) { 18 const view = new TA(sab, 32, 20); 19 const control = new TA(ab, 0, 2); 20 view[8] = 100n; 21 assert.sameValue(Atomics.sub(view, 8, 10n), 100n, 'Atomics.sub(view, 8, 10n) returns 100n'); 22 assert.sameValue(view[8], 90n, 'The value of view[8] is 90n'); 23 assert.sameValue(Atomics.sub(view, 8, -5n), 90n, 'Atomics.sub(view, 8, -5n) returns 90n'); 24 assert.sameValue(view[8], 95n, 'The value of view[8] is 95'); 25 view[3] = -5n; 26 control[0] = -5n; 27 28 assert.sameValue( 29 Atomics.sub(view, 3, 0n), 30 control[0], 31 'Atomics.sub(view, 3, 0n) returns the value of `control[0]` (-5n)' 32 ); 33 34 control[0] = 12345n; 35 view[3] = 12345n; 36 37 assert.sameValue( 38 Atomics.sub(view, 3, 0n), 39 control[0], 40 'Atomics.sub(view, 3, 0n) returns the value of `control[0]` (12345n)' 41 ); 42 43 control[0] = 123456789n; 44 view[3] = 123456789n; 45 46 assert.sameValue( 47 Atomics.sub(view, 3, 0n), 48 control[0], 49 'Atomics.sub(view, 3, 0n) returns the value of `control[0]` (123456789n)' 50 ); 51 52 testWithAtomicsInBoundsIndices(function(IdxGen) { 53 let Idx = IdxGen(view); 54 view.fill(0n); 55 Atomics.store(view, Idx, 37n); 56 assert.sameValue(Atomics.sub(view, Idx, 0n), 37n, 'Atomics.sub(view, Idx, 0n) returns 37n'); 57 }); 58 }); 59 60 reportCompare(0, 0);