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Diffstat (limited to '')
-rw-r--r-- | js/src/tests/test262/built-ins/Atomics/exchange/expected-return-value.js | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/exchange/expected-return-value.js b/js/src/tests/test262/built-ins/Atomics/exchange/expected-return-value.js new file mode 100644 index 0000000000..be86e9bb75 --- /dev/null +++ b/js/src/tests/test262/built-ins/Atomics/exchange/expected-return-value.js @@ -0,0 +1,47 @@ +// |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 +// Copyright (C) 2018 Rick Waldron. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +esid: sec-atomics.exchange +description: > + Atomics.and returns the value that existed at the + index prior to the operation. +info: | + Atomics.exchange( typedArray, index, value ) + + 1. Return ? AtomicReadModifyWrite(typedArray, index, value, second). + + AtomicReadModifyWrite( typedArray, index, value, op ) + + ... + 9. Return GetModifySetValueInBuffer(buffer, indexedPosition, + elementType, v, op). + + + GetModifySetValueInBuffer( arrayBuffer, + byteIndex, type, value, op [ , isLittleEndian ] ) + + ... + 16. Return RawBytesToNumber(type, rawBytesRead, isLittleEndian). + +features: [Atomics, SharedArrayBuffer, TypedArray] +---*/ + +const i32a = new Int32Array( + new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4) +); +const update = 0b00000001000000001000000010000001; + +assert.sameValue( + Atomics.exchange(i32a, 0, update), + 0, + 'Atomics.exchange(i32a, 0, update) returns 0' +); +assert.sameValue( + i32a[0], + update, + 'The value of i32a[0] equals the value of `update` (0b00000001000000001000000010000001)' +); + +reportCompare(0, 0); |