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The `getFalse` utility function was not excluded from cross-module-optimization, which led the optimizer to completely eliminate the main loop body Also, the passed `N` was shadowed by a local `n`.
49 lines
1.2 KiB
Swift
49 lines
1.2 KiB
Swift
//===--- Fibonacci.swift --------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import TestsUtils
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public let benchmarks =
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BenchmarkInfo(
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name: "Fibonacci2",
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runFunction: run_Fibonacci,
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tags: [.algorithm])
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func _fibonacci(_ n: Int) -> Int {
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if (n <= 2) { return 1 }
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return _fibonacci(n - 2) + _fibonacci(n - 1)
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}
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@inline(never)
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func fibonacci(_ n: Int) -> Int {
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// This if prevents optimizer from computing return value of fibonacci(32)
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// at compile time.
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if getFalse() { return 0 }
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if (n <= 2) { return 1 }
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return _fibonacci(n - 2) + _fibonacci(n - 1)
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}
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@inline(never)
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public func run_Fibonacci(_ N: Int) {
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let n = 24
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let ref_result = 46368
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var result = 0
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for _ in 1...N {
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result = fibonacci(n)
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if result != ref_result {
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break
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}
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}
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check(result == ref_result)
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}
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