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deps/v8/test/mjsunit/turboshaft/maglev-frontend/dematerialized-identical-heap-number-fields.js

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+// Copyright 2024 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.
+
+// Flags: --allow-natives-syntax --turbolev --turbofan
+
+// An unconditional deopt will be inserted after {o} has been created, but
+// before it is initialized with "arg + 1.5" and "arg + 41.5". These 2 fields
+// are thus initialized with the Float64 hole. If {o} is escape-analyzed away,
+// then the deopt state will have 2 identical HeapNumbers as input. These
+// shouldn't be GVNed, because they are mutable.
+function foo(arg) {
+  var o = {
+    x: arg + 1.5,
+    y: arg + 41.5,
+  };
+  return o.x + o.y;
+}
+
+%PrepareFunctionForOptimization(foo);
+assertEquals(NaN, foo());
+assertEquals(NaN, foo());
+
+%OptimizeFunctionOnNextCall(foo);
+assertEquals(45, foo(1));