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deps/v8/test/mjsunit/turboshaft/maglev-frontend/regress-356913284-2.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
+
+let glob_nan = NaN;
+
+function* foo(n) {
+  // Creating a Phi so that ComputePredecessorPermutations gets called a first
+  // time on a block with 2 predecessors.
+  let v = n ? 3 : 7;
+
+  // Running the function only once doesn't collect enough feedback for the next
+  // line, which will thus lead to an uncondition deopt there.
+  class C { [undefined] }
+
+  // The following loop will still be emitted, despite the unconditional deopt
+  // above, because there is a yield inside (that is, it looks like the body is
+  // reachable despite the deopt above; it's not, but Maglev doesn't realize
+  // it).
+  let i = 0;
+  for (i = n + 1; glob_nan;) {
+    yield 42;
+  }
+
+  yield i + 17 + v;
+}
+
+%PrepareFunctionForOptimization(foo);
+let gen = foo(3);
+assertEquals(24, gen.next().value);
+assertEquals(undefined, gen.next().value);
+
+%OptimizeFunctionOnNextCall(foo);
+gen = foo(3);
+assertEquals(24, gen.next().value);
+assertEquals(undefined, gen.next().value);