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deps/v8/test/mjsunit/turboshaft/maglev-frontend/store-field.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
+
+function store_field(o, v) {
+  o.x = 17; // Tagged field, no write barrier
+  o.y = v; // Tagged field, with write barrier
+  o.z = 12.29; // Double field
+  return o;
+}
+
+let o = { x : 42, y : 10, z : 14.58 };
+
+%PrepareFunctionForOptimization(store_field);
+assertEquals({ x : 17, y : undefined, z : 12.29 }, store_field(o));
+o = { x : 42, y : 10, z : 14.58 }; // Resetting {o}
+%OptimizeFunctionOnNextCall(store_field);
+assertEquals({ x : 17, y : undefined, z : 12.29 }, store_field(o));
+assertOptimized(store_field);