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-rw-r--r--rand/rand_xoshiro/src/xoshiro256starstar.rs128
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diff --git a/rand/rand_xoshiro/src/xoshiro256starstar.rs b/rand/rand_xoshiro/src/xoshiro256starstar.rs
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--- a/rand/rand_xoshiro/src/xoshiro256starstar.rs
+++ /dev/null
@@ -1,128 +0,0 @@
-// Copyright 2018 Developers of the Rand project.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#[cfg(feature="serde1")] use serde::{Serialize, Deserialize};
-use rand_core::impls::fill_bytes_via_next;
-use rand_core::le::read_u64_into;
-use rand_core::{SeedableRng, RngCore, Error};
-
-/// A xoshiro256** random number generator.
-///
-/// The xoshiro256** algorithm is not suitable for cryptographic purposes, but
-/// is very fast and has excellent statistical properties.
-///
-/// The algorithm used here is translated from [the `xoshiro256starstar.c`
-/// reference source code](http://xoshiro.di.unimi.it/xoshiro256starstar.c) by
-/// David Blackman and Sebastiano Vigna.
-#[derive(Debug, Clone)]
-#[cfg_attr(feature="serde1", derive(Serialize, Deserialize))]
-pub struct Xoshiro256StarStar {
- s: [u64; 4],
-}
-
-impl Xoshiro256StarStar {
- /// Jump forward, equivalently to 2^128 calls to `next_u64()`.
- ///
- /// This can be used to generate 2^128 non-overlapping subsequences for
- /// parallel computations.
- ///
- /// ```
- /// use rand_xoshiro::rand_core::SeedableRng;
- /// use rand_xoshiro::Xoshiro256StarStar;
- ///
- /// let rng1 = Xoshiro256StarStar::seed_from_u64(0);
- /// let mut rng2 = rng1.clone();
- /// rng2.jump();
- /// let mut rng3 = rng2.clone();
- /// rng3.jump();
- /// ```
- pub fn jump(&mut self) {
- impl_jump!(u64, self, [
- 0x180ec6d33cfd0aba, 0xd5a61266f0c9392c,
- 0xa9582618e03fc9aa, 0x39abdc4529b1661c
- ]);
- }
-
- /// Jump forward, equivalently to 2^192 calls to `next_u64()`.
- ///
- /// This can be used to generate 2^64 starting points, from each of which
- /// `jump()` will generate 2^64 non-overlapping subsequences for parallel
- /// distributed computations.
- pub fn long_jump(&mut self) {
- impl_jump!(u64, self, [
- 0x76e15d3efefdcbbf, 0xc5004e441c522fb3,
- 0x77710069854ee241, 0x39109bb02acbe635
- ]);
- }
-}
-
-impl SeedableRng for Xoshiro256StarStar {
- type Seed = [u8; 32];
-
- /// Create a new `Xoshiro256StarStar`. If `seed` is entirely 0, it will be
- /// mapped to a different seed.
- #[inline]
- fn from_seed(seed: [u8; 32]) -> Xoshiro256StarStar {
- deal_with_zero_seed!(seed, Self);
- let mut state = [0; 4];
- read_u64_into(&seed, &mut state);
- Xoshiro256StarStar { s: state }
- }
-
- /// Seed a `Xoshiro256StarStar` from a `u64` using `SplitMix64`.
- fn seed_from_u64(seed: u64) -> Xoshiro256StarStar {
- from_splitmix!(seed)
- }
-}
-
-impl RngCore for Xoshiro256StarStar {
- #[inline]
- fn next_u32(&mut self) -> u32 {
- self.next_u64() as u32
- }
-
- #[inline]
- fn next_u64(&mut self) -> u64 {
- let result_starstar = starstar_u64!(self.s[1]);
- impl_xoshiro_u64!(self);
- result_starstar
- }
-
- #[inline]
- fn fill_bytes(&mut self, dest: &mut [u8]) {
- fill_bytes_via_next(self, dest);
- }
-
- #[inline]
- fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
- self.fill_bytes(dest);
- Ok(())
- }
-}
-
-#[cfg(test)]
-mod tests {
- use super::*;
-
- #[test]
- fn reference() {
- let mut rng = Xoshiro256StarStar::from_seed(
- [1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
- 3, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0]);
- // These values were produced with the reference implementation:
- // http://xoshiro.di.unimi.it/xoshiro128starstar.c
- let expected = [
- 11520, 0, 1509978240, 1215971899390074240, 1216172134540287360,
- 607988272756665600, 16172922978634559625, 8476171486693032832,
- 10595114339597558777, 2904607092377533576,
- ];
- for &e in &expected {
- assert_eq!(rng.next_u64(), e);
- }
- }
-}