File: SplitMix64.swift

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//===----------------------------------------------------------*- swift -*-===//
//
// This source file is part of the Swift Argument Parser open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//

struct SplitMix64: RandomNumberGenerator {
    private var state: UInt64

    init(seed: UInt64) {
        self.state = seed
    }

    mutating func next() -> UInt64 {
        self.state &+= 0x9e3779b97f4a7c15
        var z: UInt64 = self.state
        z = (z ^ (z &>> 30)) &* 0xbf58476d1ce4e5b9
        z = (z ^ (z &>> 27)) &* 0x94d049bb133111eb
        return z ^ (z &>> 31)
    }
}