Upload Kmake

deps/v8/test/mjsunit/compiler/bigint-multiply-truncate.js

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+// Copyright 2022 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 --turbofan --no-always-turbofan
+
+function TestMultiplyAndTruncate(a, b) {
+  return BigInt.asIntN(3, a * b);
+}
+
+function OptimizeAndTest(fn) {
+  let bi = 2n ** (2n ** 29n);
+  if (%Is64Bit()) {
+    %PrepareFunctionForOptimization(fn);
+    assertEquals(-4n, fn(3n, 4n));
+    assertEquals(-2n, fn(5n, 6n));
+    %OptimizeFunctionOnNextCall(fn);
+    // After optimization, operands are truncated to Word64
+    // before being multiplied. No exceptions should be thrown
+    // and the correct result is expected.
+    assertEquals(-4n, fn(bi + 3n, bi + 4n));
+    assertOptimized(fn);
+  }
+}
+
+OptimizeAndTest(TestMultiplyAndTruncate);