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deps/v8/test/mjsunit/maglev/poly-store-transition.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 --maglev --no-always-turbofan
+
+function poly_store(a, x) {
+  a[0] = x;
+};
+
+var y = new Array();
+y[0] = 1.1;
+y.x = 12;
+// We don't use {y}, but it prevents the map packed double map with `x` from
+// being GCed, which avoids {poly_store} from being deopted.
+
+%PrepareFunctionForOptimization(poly_store);
+poly_store([1.1], 'a');
+poly_store([1.1], 2.1);
+var x = new Array();
+x[0] = 1.1;
+x.x = 12;
+poly_store(x, 'a');
+%OptimizeMaglevOnNextCall(poly_store);
+
+var c = new Array();
+c[0] = 1.1;
+assertTrue(%HasDoubleElements(c));
+poly_store(c, 'a');
+assertTrue(%HasObjectElements(c));
+assertEquals(c[0], 'a');
+assertTrue(isMaglevved(poly_store));