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deps/v8/test/mjsunit/const-tracking-let-already-not-constant-no-deopt-maglev.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: --const-tracking-let --allow-natives-syntax
+// Flags: --turbofan --no-always-turbofan --maglev --no-stress-maglev
+// Flags: --sparkplug --no-always-sparkplug
+
+let a = 0;
+
+function read() {
+  return a;
+}
+
+%PrepareFunctionForOptimization(read);
+assertEquals(0, read());
+
+%OptimizeFunctionOnNextCall(read);
+assertEquals(0, read());
+assertOptimized(read);
+
+function write(newValue) {
+  a = newValue;
+}
+%PrepareFunctionForOptimization(write);
+write(0);
+
+%OptimizeMaglevOnNextCall(write);
+write(0);
+
+// Invalidate the constness from the outside (of `write`).
+a = 3;
+
+assertUnoptimized(read);
+assertEquals(3, read());
+
+// Write was also deoptimized, because it depends on `a` constness.
+assertUnoptimized(write);
+
+%OptimizeMaglevOnNextCall(write);
+write(1);
+// Now it depends on Sminess of the context slot.
+assertOptimized(write);
+
+assertEquals(1, read());