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deps/v8/test/mjsunit/regress/regress-crbug-1335445.js

@@ -0,0 +1,37 @@
+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This test checks that indexOf correctly sees that -0.0 == 0 when using its
+// SIMD fast path on unaligned FixedDoubleArrays. The issue with testing that is
+// that when creating an array from JavaScript, it's not possible to ensure that
+// it will be unaligned. Thus, we wrapped the test in a loop, which additionally
+// allocates some objects (or variable size), so that the array is eventually
+// not aligned. In practice, this looks fairly reliable: about half the arrays
+// are aligned on 8 bytes, and half are not.
+
+// We store all the objects we create in this array, so that escape analysis
+// doesn't get rid of allocations.
+let objects = [];
+
+for (let i = 0; i < 100; i++) {
+
+  for (let x = 0; x < i; x++) {
+    if (i % 2 == 0) {
+      objects.push({ i: 35 });
+    } else {
+      objects.push({ i: 35, "a":42 });
+    }
+  }
+
+  let arr = Array();
+  objects.push(arr);
+  for (let i = 0; i < 100; i++) {
+    arr[i] = 1.5;
+  }
+
+  arr[20] = -0.0;
+  arr[23] = 0;
+
+  assertEquals(20, arr.indexOf(0));
+}