diff options
Diffstat (limited to 'js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js b/js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js new file mode 100644 index 0000000000..bcbeb5b99d --- /dev/null +++ b/js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js @@ -0,0 +1,48 @@ +// |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.load +description: > + Atomics.load returns the value that existed at the + index prior to the operation. +info: | + Atomics.load( typedArray, index, value ) + + 1. Return ? AtomicLoad(typedArray, index). + + AtomicLoad( typedArray, index ) + + 1. Let buffer be ? ValidateSharedIntegerTypedArray(typedArray). + 2. Let i be ? ValidateAtomicAccess(typedArray, index). + 3. Let arrayTypeName be typedArray.[[TypedArrayName]]. + 4. Let elementSize be the Number value of the Element Size value + specified in Table 56 for arrayTypeName. + 5. Let elementType be the String value of the Element Type value + in Table 56 for arrayTypeName. + 6. Let offset be typedArray.[[ByteOffset]]. + 7. Let indexedPosition be (i × elementSize) + offset. + 8. Return GetValueFromBuffer(buffer, indexedPosition, elementType, + true, "SeqCst"). + +features: [Atomics, SharedArrayBuffer, TypedArray] +---*/ + +const i32a = new Int32Array( + new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4) +); +const update = 0b00000001000000001000000010000001; + +assert.sameValue(Atomics.load(i32a, 0), 0, 'Atomics.load(i32a, 0) returns 0'); + +i32a[0] = update; + +assert.sameValue( + Atomics.load(i32a, 0), + update, + 'Atomics.load(i32a, 0) returns the value of `update` (0b00000001000000001000000010000001)' +); + + +reportCompare(0, 0); |