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deps/v8/test/mjsunit/turboshaft/maglev-frontend/string-concat.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 f(short_str, long_str) {
+  let cons_str = short_str + long_str;
+  let seq_str = short_str + 'cd';
+  if (seq_str == 'abcdcd') {
+    return cons_str.length;
+  } else {
+    return seq_str[2];
+  }
+}
+
+%PrepareFunctionForOptimization(f);
+assertEquals(19, f("abcd", "abcdefghijklmno"));
+assertEquals("c", f("abcde", "abcdefghijklmno"));
+%OptimizeMaglevOnNextCall(f);
+assertEquals(19, f("abcd", "abcdefghijklmno"));
+assertEquals("c", f("abcde", "abcdefghijklmno"));
+%OptimizeFunctionOnNextCall(f);
+assertEquals(19, f("abcd", "abcdefghijklmno"));
+assertEquals("c", f("abcde", "abcdefghijklmno"));
+assertOptimized(f);