1 files changed, 60 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/sub/bigint/good-views.js b/js/src/tests/test262/built-ins/Atomics/sub/bigint/good-views.js
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+++ b/js/src/tests/test262/built-ins/Atomics/sub/bigint/good-views.js
@@ -0,0 +1,60 @@
+// |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.sub
+description: Test Atomics.sub on arrays that allow atomic operations
+includes: [testAtomics.js, testBigIntTypedArray.js]
+features: [ArrayBuffer, Atomics, BigInt, DataView, SharedArrayBuffer, Symbol, TypedArray]
+---*/
+// Make it interesting - use non-zero byteOffsets and non-zero indexes.
+// In-bounds boundary cases for indexing
+// Atomics.store() computes an index from Idx in the same way as other
+// Atomics operations, not quite like view[Idx].
+const sab = new SharedArrayBuffer(1024);
+const ab = new ArrayBuffer(BigInt64Array.BYTES_PER_ELEMENT * 2);
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  const view = new TA(sab, 32, 20);
+  const control = new TA(ab, 0, 2);
+  view[8] = 100n;
+  assert.sameValue(Atomics.sub(view, 8, 10n), 100n, 'Atomics.sub(view, 8, 10n) returns 100n');
+  assert.sameValue(view[8], 90n, 'The value of view[8] is 90n');
+  assert.sameValue(Atomics.sub(view, 8, -5n), 90n, 'Atomics.sub(view, 8, -5n) returns 90n');
+  assert.sameValue(view[8], 95n, 'The value of view[8] is 95');
+  view[3] = -5n;
+  control[0] = -5n;
+
+  assert.sameValue(
+    Atomics.sub(view, 3, 0n),
+    control[0],
+    'Atomics.sub(view, 3, 0n) returns the value of `control[0]` (-5n)'
+  );
+
+  control[0] = 12345n;
+  view[3] = 12345n;
+
+  assert.sameValue(
+    Atomics.sub(view, 3, 0n),
+    control[0],
+    'Atomics.sub(view, 3, 0n) returns the value of `control[0]` (12345n)'
+  );
+
+  control[0] = 123456789n;
+  view[3] = 123456789n;
+
+  assert.sameValue(
+    Atomics.sub(view, 3, 0n),
+    control[0],
+    'Atomics.sub(view, 3, 0n) returns the value of `control[0]` (123456789n)'
+  );
+
+  testWithAtomicsInBoundsIndices(function(IdxGen) {
+    let Idx = IdxGen(view);
+    view.fill(0n);
+    Atomics.store(view, Idx, 37n);
+    assert.sameValue(Atomics.sub(view, Idx, 0n), 37n, 'Atomics.sub(view, Idx, 0n) returns 37n');
+  });
+});
+
+reportCompare(0, 0);