Move XorShiftRng to its own crate

.travis.yml

@@ -14,19 +14,25 @@ matrix:
         # TODO: use --tests instead of --lib on more recent compiler
         - cargo test --lib --no-default-features
         - cargo test --package rand_core --no-default-features
+        - cargo test --package rand_isaac --features serde1
+        - cargo test --package rand_xorshift --features serde1
         - cargo test --features serde1,log
     - rust: stable
       os: osx
       install:
       script:
         - cargo test --tests --no-default-features
         - cargo test --package rand_core --no-default-features
+        - cargo test --package rand_isaac --features serde1
+        - cargo test --package rand_xorshift --features serde1
         - cargo test --features serde1,log
     - rust: beta
       install:
       script:
         - cargo test --tests --no-default-features
         - cargo test --package rand_core --no-default-features
+        - cargo test --package rand_isaac --features serde1
+        - cargo test --package rand_xorshift --features serde1
         - cargo test --features serde1,log
     - rust: nightly
       install:

Cargo.toml

@@ -24,18 +24,17 @@ std = ["rand_core/std", "alloc", "libc", "winapi", "cloudabi", "fuchsia-zircon"]
 alloc = ["rand_core/alloc"]  # enables Vec and Box support (without std)
 i128_support = [] # enables i128 and u128 support
 simd_support = [] # enables SIMD support
-serde1 = ["serde", "serde_derive", "rand_core/serde1"] # enables serialization for PRNGs
+serde1 = ["rand_core/serde1", "rand_isaac/serde1", "rand_xorshift/serde1"] # enables serialization for PRNGs
 
 [workspace]
-members = ["rand_core", "rand_isaac"]
+members = ["rand_core", "rand_isaac", "rand_xorshift"]
 
 [dependencies]
 rand_core = { path = "rand_core", version = "0.2", default-features = false }
 # only for deprecations and benches:
-rand_isaac = { path = "rand_isaac", version = "0.1", default-features = false }
+rand_isaac = { path = "rand_isaac", version = "0.1" }
+rand_xorshift = { path = "rand_xorshift", version = "0.1" }
 log = { version = "0.4", optional = true }
-serde = { version = "1", optional = true }
-serde_derive = { version = "1", optional = true }
 
 [target.'cfg(unix)'.dependencies]
 libc = { version = "0.2", optional = true }
@@ -54,10 +53,5 @@ fuchsia-zircon = { version = "0.3.2", optional = true }
 stdweb = { version = "0.4", optional = true }
 wasm-bindgen = { version = "0.2", optional = true }
 
-[dev-dependencies]
-# This is for testing serde, unfortunately we can't specify feature-gated dev
-# deps yet, see: https://github.com/rust-lang/cargo/issues/1596
-bincode = "1.0"
-
 [package.metadata.docs.rs]
 all-features = true

benches/distributions.rs

@@ -11,14 +11,14 @@ use std::mem::size_of;
 use test::Bencher;
 
 use rand::{Rng, FromEntropy};
-use rand::prng::XorShiftRng;
+use rand::rngs::SmallRng;
 use rand::distributions::*;
 
 macro_rules! distr_int {
     ($fnn:ident, $ty:ty, $distr:expr) => {
         #[bench]
         fn $fnn(b: &mut Bencher) {
-            let mut rng = XorShiftRng::from_entropy();
+            let mut rng = SmallRng::from_entropy();
             let distr = $distr;
 
             b.iter(|| {
@@ -38,7 +38,7 @@ macro_rules! distr_float {
     ($fnn:ident, $ty:ty, $distr:expr) => {
         #[bench]
         fn $fnn(b: &mut Bencher) {
-            let mut rng = XorShiftRng::from_entropy();
+            let mut rng = SmallRng::from_entropy();
             let distr = $distr;
 
             b.iter(|| {
@@ -58,7 +58,7 @@ macro_rules! distr {
     ($fnn:ident, $ty:ty, $distr:expr) => {
         #[bench]
         fn $fnn(b: &mut Bencher) {
-            let mut rng = XorShiftRng::from_entropy();
+            let mut rng = SmallRng::from_entropy();
             let distr = $distr;
 
             b.iter(|| {
@@ -126,7 +126,7 @@ macro_rules! gen_range_int {
     ($fnn:ident, $ty:ident, $low:expr, $high:expr) => {
         #[bench]
         fn $fnn(b: &mut Bencher) {
-            let mut rng = XorShiftRng::from_entropy();
+            let mut rng = SmallRng::from_entropy();
 
             b.iter(|| {
                 let mut high = $high;
@@ -155,7 +155,7 @@ macro_rules! gen_range_float {
     ($fnn:ident, $ty:ident, $low:expr, $high:expr) => {
         #[bench]
         fn $fnn(b: &mut Bencher) {
-            let mut rng = XorShiftRng::from_entropy();
+            let mut rng = SmallRng::from_entropy();
 
             b.iter(|| {
                 let mut high = $high;
@@ -179,7 +179,7 @@ gen_range_float!(gen_range_f64, f64, 123.456f64, 7890.12);
 
 #[bench]
 fn dist_iter(b: &mut Bencher) {
-    let mut rng = XorShiftRng::from_entropy();
+    let mut rng = SmallRng::from_entropy();
     let distr = Normal::new(-2.71828, 3.14159);
     let mut iter = distr.sample_iter(&mut rng);
 

benches/generators.rs

@@ -3,6 +3,7 @@
 extern crate test;
 extern crate rand;
 extern crate rand_isaac;
+extern crate rand_xorshift;
 
 const RAND_BENCH_N: u64 = 1000;
 const BYTES_LEN: usize = 1024;
@@ -11,11 +12,12 @@ use std::mem::size_of;
 use test::{black_box, Bencher};
 
 use rand::prelude::*;
-use rand::prng::{XorShiftRng, Hc128Rng, ChaChaRng};
+use rand::prng::{Hc128Rng, ChaChaRng};
 use rand::prng::hc128::Hc128Core;
 use rand::rngs::adapter::ReseedingRng;
 use rand::rngs::{OsRng, JitterRng, EntropyRng};
 use rand_isaac::{IsaacRng, Isaac64Rng};
+use rand_xorshift::XorShiftRng;
 
 macro_rules! gen_bytes {
     ($fnn:ident, $gen:expr) => {

rand_isaac/Cargo.toml

@@ -18,9 +18,14 @@ travis-ci = { repository = "rust-lang-nursery/rand" }
 appveyor = { repository = "alexcrichton/rand" }
 
 [features]
-serde1 = ["serde", "serde_derive"] # enables serde for BlockRng wrapper
+serde1 = ["serde", "serde_derive", "rand_core/serde1"]
 
 [dependencies]
 rand_core = { path = "../rand_core", version = "0.2", default-features=false }
 serde = { version = "1", optional = true }
 serde_derive = { version = "^1.0.38", optional = true }
+
+[dev-dependencies]
+# This is for testing serde, unfortunately we can't specify feature-gated dev
+# deps yet, see: https://github.com/rust-lang/cargo/issues/1596
+bincode = "1"

rand_isaac/src/isaac.rs

@@ -453,7 +453,7 @@ mod test {
     }
 
     #[test]
-    #[cfg(all(feature="serde1", feature="std"))]
+    #[cfg(feature="serde1")]
     fn test_isaac_serde() {
         use bincode;
         use std::io::{BufWriter, BufReader};

rand_isaac/src/isaac64.rs

@@ -445,7 +445,7 @@ mod test {
     }
 
     #[test]
-    #[cfg(all(feature="serde1", feature="std"))]
+    #[cfg(feature="serde1")]
     fn test_isaac64_serde() {
         use bincode;
         use std::io::{BufWriter, BufReader};

rand_isaac/src/lib.rs

@@ -18,14 +18,17 @@
 #![deny(missing_debug_implementations)]
 #![doc(test(attr(allow(unused_variables), deny(warnings))))]
 
-#![no_std]
+#![cfg_attr(not(all(feature="serde1", test)), no_std)]
 
 extern crate rand_core;
 
-#[cfg(test)] #[cfg(feature="serde1")] extern crate bincode;
 #[cfg(feature="serde1")] extern crate serde;
 #[cfg(feature="serde1")] #[macro_use] extern crate serde_derive;
 
+// To test serialization we need bincode and the standard library
+#[cfg(all(feature="serde1", test))] extern crate bincode;
+#[cfg(all(feature="serde1", test))] extern crate std as core;
+
 pub mod isaac;
 pub mod isaac64;
 

rand_xorshift/CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2018-07-16
+- Initial release

rand_xorshift/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "rand_xorshift"
+version = "0.1.0" # NB: When modifying, also modify html_root_url in lib.rs
+authors = ["The Rust Project Developers"]
+license = "MIT/Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/rust-lang-nursery/rand"
+documentation = "https://docs.rs/rand_isaac"
+homepage = "https://crates.io/crates/rand_isaac"
+description = """
+Xorshift random number generator
+"""
+keywords = ["random", "rng", "xorshift"]
+categories = ["algorithms", "no-std"]
+
+[badges]
+travis-ci = { repository = "rust-lang-nursery/rand" }
+appveyor = { repository = "alexcrichton/rand" }
+
+[features]
+serde1 = ["serde", "serde_derive"]
+
+[dependencies]
+rand_core = { path = "../rand_core", version = "0.2", default-features=false }
+serde = { version = "1", optional = true }
+serde_derive = { version = "^1.0.38", optional = true }
+
+[dev-dependencies]
+# This is for testing serde, unfortunately we can't specify feature-gated dev
+# deps yet, see: https://github.com/rust-lang/cargo/issues/1596
+bincode = "1"