1 files changed, 0 insertions, 225 deletions
diff --git a/rand/rand_pcg/src/pcg128.rs b/rand/rand_pcg/src/pcg128.rs
deleted file mode 100644
index 311a41b..0000000
--- a/rand/rand_pcg/src/pcg128.rs
+++ /dev/null
@@ -1,225 +0,0 @@
-// Copyright 2018 Developers of the Rand project.
-// Copyright 2017 Paul Dicker.
-// Copyright 2014-2017 Melissa O'Neill and PCG Project contributors
-//
-// 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.
-
-//! PCG random number generators
-
-// This is the default multiplier used by PCG for 64-bit state.
-const MULTIPLIER: u128 = 0x2360_ED05_1FC6_5DA4_4385_DF64_9FCC_F645;
-
-use core::fmt;
-use rand_core::{RngCore, SeedableRng, Error, le};
-#[cfg(feature="serde1")] use serde::{Serialize, Deserialize};
-
-/// A PCG random number generator (XSL RR 128/64 (LCG) variant).
-///
-/// Permuted Congruential Generator with 128-bit state, internal Linear
-/// Congruential Generator, and 64-bit output via "xorshift low (bits),
-/// random rotation" output function.
-///
-/// This is a 128-bit LCG with explicitly chosen stream with the PCG-XSL-RR
-/// output function. This combination is the standard `pcg64`.
-///
-/// Despite the name, this implementation uses 32 bytes (256 bit) space
-/// comprising 128 bits of state and 128 bits stream selector. These are both
-/// set by `SeedableRng`, using a 256-bit seed.
-#[derive(Clone)]
-#[cfg_attr(feature="serde1", derive(Serialize,Deserialize))]
-pub struct Lcg128Xsl64 {
-    state: u128,
-    increment: u128,
-}
-
-/// `Lcg128Xsl64` is also officially known as `pcg64`.
-pub type Pcg64 = Lcg128Xsl64;
-
-impl Lcg128Xsl64 {
-    /// Construct an instance compatible with PCG seed and stream.
-    ///
-    /// Note that PCG specifies default values for both parameters:
-    ///
-    /// - `state = 0xcafef00dd15ea5e5`
-    /// - `stream = 0xa02bdbf7bb3c0a7ac28fa16a64abf96`
-    pub fn new(state: u128, stream: u128) -> Self {
-        // The increment must be odd, hence we discard one bit:
-        let increment = (stream << 1) | 1;
-        Lcg128Xsl64::from_state_incr(state, increment)
-    }
-
-    #[inline]
-    fn from_state_incr(state: u128, increment: u128) -> Self {
-        let mut pcg = Lcg128Xsl64 { state, increment };
-        // Move away from inital value:
-        pcg.state = pcg.state.wrapping_add(pcg.increment);
-        pcg.step();
-        pcg
-    }
-
-    #[inline]
-    fn step(&mut self) {
-        // prepare the LCG for the next round
-        self.state = self.state
-            .wrapping_mul(MULTIPLIER)
-            .wrapping_add(self.increment);
-    }
-}
-
-// Custom Debug implementation that does not expose the internal state
-impl fmt::Debug for Lcg128Xsl64 {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "Lcg128Xsl64 {{}}")
-    }
-}
-
-/// We use a single 255-bit seed to initialise the state and select a stream.
-/// One `seed` bit (lowest bit of `seed[8]`) is ignored.
-impl SeedableRng for Lcg128Xsl64 {
-    type Seed = [u8; 32];
-
-    fn from_seed(seed: Self::Seed) -> Self {
-        let mut seed_u64 = [0u64; 4];
-        le::read_u64_into(&seed, &mut seed_u64);
-        let state = u128::from(seed_u64[0]) | (u128::from(seed_u64[1]) << 64);
-        let incr = u128::from(seed_u64[2]) | (u128::from(seed_u64[3]) << 64);
-
-        // The increment must be odd, hence we discard one bit:
-        Lcg128Xsl64::from_state_incr(state, incr | 1)
-    }
-}
-
-impl RngCore for Lcg128Xsl64 {
-    #[inline]
-    fn next_u32(&mut self) -> u32 {
-        self.next_u64() as u32
-    }
-
-    #[inline]
-    fn next_u64(&mut self) -> u64 {
-        self.step();
-        output_xsl_rr(self.state)
-    }
-
-    #[inline]
-    fn fill_bytes(&mut self, dest: &mut [u8]) {
-        fill_bytes_impl(self, dest)
-    }
-
-    #[inline]
-    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
-        self.fill_bytes(dest);
-        Ok(())
-    }
-}
-
-
-/// A PCG random number generator (XSL 128/64 (MCG) variant).
-///
-/// Permuted Congruential Generator with 128-bit state, internal Multiplicative
-/// Congruential Generator, and 64-bit output via "xorshift low (bits),
-/// random rotation" output function.
-///
-/// This is a 128-bit MCG with the PCG-XSL-RR output function, also known as
-/// `pcg64_fast`.
-/// Note that compared to the standard `pcg64` (128-bit LCG with PCG-XSL-RR
-/// output function), this RNG is faster, also has a long cycle, and still has
-/// good performance on statistical tests.
-#[derive(Clone)]
-#[cfg_attr(feature="serde1", derive(Serialize,Deserialize))]
-pub struct Mcg128Xsl64 {
-    state: u128,
-}
-
-/// A friendly name for `Mcg128Xsl64` (also known as `pcg64_fast`).
-pub type Pcg64Mcg = Mcg128Xsl64;
-
-impl Mcg128Xsl64 {
-    /// Construct an instance compatible with PCG seed.
-    ///
-    /// Note that PCG specifies a default value for the parameter:
-    ///
-    /// - `state = 0xcafef00dd15ea5e5`
-    pub fn new(state: u128) -> Self {
-        // Force low bit to 1, as in C version (C++ uses `state | 3` instead).
-        Mcg128Xsl64 { state: state | 1 }
-    }
-}
-
-// Custom Debug implementation that does not expose the internal state
-impl fmt::Debug for Mcg128Xsl64 {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "Mcg128Xsl64 {{}}")
-    }
-}
-
-/// We use a single 126-bit seed to initialise the state and select a stream.
-/// Two `seed` bits (lowest order of last byte) are ignored.
-impl SeedableRng for Mcg128Xsl64 {
-    type Seed = [u8; 16];
-
-    fn from_seed(seed: Self::Seed) -> Self {
-        // Read as if a little-endian u128 value:
-        let mut seed_u64 = [0u64; 2];
-        le::read_u64_into(&seed, &mut seed_u64);
-        let state = u128::from(seed_u64[0])  |
-                    u128::from(seed_u64[1]) << 64;
-        Mcg128Xsl64::new(state)
-    }
-}
-
-impl RngCore for Mcg128Xsl64 {
-    #[inline]
-    fn next_u32(&mut self) -> u32 {
-        self.next_u64() as u32
-    }
-
-    #[inline]
-    fn next_u64(&mut self) -> u64 {
-        self.state = self.state.wrapping_mul(MULTIPLIER);
-        output_xsl_rr(self.state)
-    }
-
-    #[inline]
-    fn fill_bytes(&mut self, dest: &mut [u8]) {
-        fill_bytes_impl(self, dest)
-    }
-
-    #[inline]
-    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
-        self.fill_bytes(dest);
-        Ok(())
-    }
-}
-
-#[inline(always)]
-fn output_xsl_rr(state: u128) -> u64 {
-    // Output function XSL RR ("xorshift low (bits), random rotation")
-    // Constants are for 128-bit state, 64-bit output
-    const XSHIFT: u32 = 64;     // (128 - 64 + 64) / 2
-    const ROTATE: u32 = 122;    // 128 - 6
-
-    let rot = (state >> ROTATE) as u32;
-    let xsl = ((state >> XSHIFT) as u64) ^ (state as u64);
-    xsl.rotate_right(rot)
-}
-
-#[inline(always)]
-fn fill_bytes_impl<R: RngCore + ?Sized>(rng: &mut R, dest: &mut [u8]) {
-    let mut left = dest;
-    while left.len() >= 8 {
-        let (l, r) = {left}.split_at_mut(8);
-        left = r;
-        let chunk: [u8; 8] = rng.next_u64().to_le_bytes();
-        l.copy_from_slice(&chunk);
-    }
-    let n = left.len();
-    if n > 0 {
-        let chunk: [u8; 8] = rng.next_u64().to_le_bytes();
-        left.copy_from_slice(&chunk[..n]);
-    }
-}