Upload Kmake

deps/v8/test/mjsunit/turboshaft/maglev-frontend/const-tracking-let.js

@@ -0,0 +1,47 @@
+// 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
+// Flags: --no-always-turbofan --const-tracking-let
+
+let glob_a = 0;
+let glob_b = 3.35;
+{
+  function compute_val(v) { return v + 1.15; }
+  function read() { return glob_a + glob_b; }
+  function write(v, w) {
+    glob_a = v;
+    let f64 = compute_val(w);
+    glob_b = f64;
+  }
+
+  %PrepareFunctionForOptimization(compute_val);
+
+  %PrepareFunctionForOptimization(read);
+  assertEquals(3.35, read());
+  %OptimizeFunctionOnNextCall(read);
+  assertEquals(3.35, read());
+  assertOptimized(read);
+
+  %PrepareFunctionForOptimization(write);
+  // Write the same value. This won't invalidate the constness.
+  write(0, 2.2);
+  glob_b = 3.35;
+  assertEquals(3.35, read());
+
+  %OptimizeFunctionOnNextCall(write);
+  write(0, 2.2);
+  assertEquals(3.35, read());
+  assertOptimized(read);
+
+  // Invalidating {glob_a} constness.
+  write(1, 2.2);
+  assertUnoptimized(write);
+  assertEquals(4.35, read());
+
+  %OptimizeFunctionOnNextCall(write);
+  write(1, 2.2);
+  assertEquals(4.35, read());
+  assertOptimized(write);
+}