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[benchmark] Add SplitMix64 PRNG #24357

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Merged
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Apr 29, 2019
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[benchmark] Add SplitMix64 PRNG #24357

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23 changes: 23 additions & 0 deletions benchmark/utils/TestsUtils.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -221,6 +221,29 @@ public func Random() -> Int64 {
return lfsrRandomGenerator.randInt()
}

// This is a fixed-increment version of Java 8's SplittableRandom generator.
// It is a very fast generator passing BigCrush, with 64 bits of state.
// See http://dx.doi.org/10.1145/2714064.2660195 and
// http://docs.oracle.com/javase/8/docs/api/java/util/SplittableRandom.html
//
// Derived from public domain C implementation by Sebastiano Vigna
// See http://xoshiro.di.unimi.it/splitmix64.c
public struct SplitMix64: RandomNumberGenerator {
private var state: UInt64

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

public 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)
}
}

@inlinable // FIXME(inline-always)
@inline(__always)
public func CheckResults(
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