1 files changed, 140 insertions, 0 deletions
diff --git a/third_party/rust/rand/benches/misc.rs b/third_party/rust/rand/benches/misc.rs
new file mode 100644
index 0000000000..4098686348
--- /dev/null
+++ b/third_party/rust/rand/benches/misc.rs
@@ -0,0 +1,140 @@
+// 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.
+
+#![feature(test)]
+
+extern crate test;
+
+const RAND_BENCH_N: u64 = 1000;
+
+use test::Bencher;
+
+use rand::prelude::*;
+use rand::distributions::{Distribution, Standard, Bernoulli};
+use rand_pcg::{Pcg32, Pcg64Mcg};
+
+#[bench]
+fn misc_gen_bool_const(b: &mut Bencher) {
+    let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let mut accum = true;
+        for _ in 0..crate::RAND_BENCH_N {
+            accum ^= rng.gen_bool(0.18);
+        }
+        accum
+    })
+}
+
+#[bench]
+fn misc_gen_bool_var(b: &mut Bencher) {
+    let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let mut accum = true;
+        let mut p = 0.18;
+        for _ in 0..crate::RAND_BENCH_N {
+            accum ^= rng.gen_bool(p);
+            p += 0.0001;
+        }
+        accum
+    })
+}
+
+#[bench]
+fn misc_gen_ratio_const(b: &mut Bencher) {
+    let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let mut accum = true;
+        for _ in 0..crate::RAND_BENCH_N {
+            accum ^= rng.gen_ratio(2, 3);
+        }
+        accum
+    })
+}
+
+#[bench]
+fn misc_gen_ratio_var(b: &mut Bencher) {
+    let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let mut accum = true;
+        for i in 2..(crate::RAND_BENCH_N as u32 + 2) {
+            accum ^= rng.gen_ratio(i, i + 1);
+        }
+        accum
+    })
+}
+
+#[bench]
+fn misc_bernoulli_const(b: &mut Bencher) {
+    let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let d = rand::distributions::Bernoulli::new(0.18).unwrap();
+        let mut accum = true;
+        for _ in 0..crate::RAND_BENCH_N {
+            accum ^= rng.sample(d);
+        }
+        accum
+    })
+}
+
+#[bench]
+fn misc_bernoulli_var(b: &mut Bencher) {
+    let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let mut accum = true;
+        let mut p = 0.18;
+        for _ in 0..crate::RAND_BENCH_N {
+            let d = Bernoulli::new(p).unwrap();
+            accum ^= rng.sample(d);
+            p += 0.0001;
+        }
+        accum
+    })
+}
+
+#[bench]
+fn gen_1k_iter_repeat(b: &mut Bencher) {
+    use std::iter;
+    let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let v: Vec<u64> = iter::repeat(()).map(|()| rng.gen()).take(128).collect();
+        v
+    });
+    b.bytes = 1024;
+}
+
+#[bench]
+fn gen_1k_sample_iter(b: &mut Bencher) {
+    let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        let v: Vec<u64> = Standard.sample_iter(&mut rng).take(128).collect();
+        v
+    });
+    b.bytes = 1024;
+}
+
+#[bench]
+fn gen_1k_gen_array(b: &mut Bencher) {
+    let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
+    b.iter(|| {
+        // max supported array length is 32!
+        let v: [[u64; 32]; 4] = rng.gen();
+        v
+    });
+    b.bytes = 1024;
+}
+
+#[bench]
+fn gen_1k_fill(b: &mut Bencher) {
+    let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
+    let mut buf = [0u64; 128];
+    b.iter(|| {
+        rng.fill(&mut buf[..]);
+        buf
+    });
+    b.bytes = 1024;
+}