38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
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// Copyright 2021 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --opt --no-always-opt
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function f(x) {
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return BigInt.asUintN(3, x);
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}
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%PrepareFunctionForOptimization(f);
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assertEquals(7n, f(7n));
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assertEquals(1n, f(9n));
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%OptimizeFunctionOnNextCall(f);
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assertEquals(7n, f(7n));
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assertEquals(1n, f(9n));
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assertOptimized(f);
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// BigInt.asUintN throws TypeError for non-BigInt arguments.
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assertThrows(() => f(2), TypeError);
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if(%Is64Bit()) {
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// On 64 bit architectures TurboFan optimizes BigInt.asUintN to native code
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// that deoptimizes on non-BigInt arguments.
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assertUnoptimized(f);
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// The next time the function is optimized, speculation should be disabled
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// so the builtin call is kept, which won't deoptimize again.
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%PrepareFunctionForOptimization(f);
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%OptimizeFunctionOnNextCall(f);
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}
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assertEquals(7n, f(7n));
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assertOptimized(f);
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// Re-optimized still throws but does not deopt-loop.
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assertThrows(() => f(2), TypeError);
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assertOptimized(f);
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