1 files changed, 133 insertions, 0 deletions
diff --git a/rand/benches/generators.rs b/rand/benches/generators.rs
new file mode 100644
index 0000000..daee7c5
--- /dev/null
+++ b/rand/benches/generators.rs
@@ -0,0 +1,133 @@
+#![feature(test)]
+
+extern crate test;
+extern crate rand;
+
+const RAND_BENCH_N: u64 = 1000;
+const BYTES_LEN: usize = 1024;
+
+use std::mem::size_of;
+use test::{black_box, Bencher};
+
+use rand::{Rng, StdRng, OsRng, JitterRng};
+use rand::{XorShiftRng, IsaacRng, Isaac64Rng, ChaChaRng};
+
+macro_rules! gen_bytes {
+    ($fnn:ident, $gen:ident) => {
+        #[bench]
+        fn $fnn(b: &mut Bencher) {
+            let mut rng: $gen = OsRng::new().unwrap().gen();
+            let mut buf = [0u8; BYTES_LEN];
+            b.iter(|| {
+                for _ in 0..RAND_BENCH_N {
+                    rng.fill_bytes(&mut buf);
+                    black_box(buf);
+                }
+            });
+            b.bytes = BYTES_LEN as u64 * RAND_BENCH_N;
+        }
+    }
+}
+
+macro_rules! gen_bytes_new {
+    ($fnn:ident, $gen:ident) => {
+        #[bench]
+        fn $fnn(b: &mut Bencher) {
+            let mut rng = $gen::new().unwrap();
+            let mut buf = [0u8; BYTES_LEN];
+            b.iter(|| {
+                for _ in 0..RAND_BENCH_N {
+                    rng.fill_bytes(&mut buf);
+                    black_box(buf);
+                }
+            });
+            b.bytes = BYTES_LEN as u64 * RAND_BENCH_N;
+        }
+    }
+}
+
+gen_bytes!(gen_bytes_xorshift, XorShiftRng);
+gen_bytes!(gen_bytes_isaac, IsaacRng);
+gen_bytes!(gen_bytes_isaac64, Isaac64Rng);
+gen_bytes!(gen_bytes_chacha, ChaChaRng);
+gen_bytes_new!(gen_bytes_std, StdRng);
+gen_bytes_new!(gen_bytes_os, OsRng);
+
+
+macro_rules! gen_uint {
+    ($fnn:ident, $ty:ty, $gen:ident) => {
+        #[bench]
+        fn $fnn(b: &mut Bencher) {
+            let mut rng: $gen = OsRng::new().unwrap().gen();
+            b.iter(|| {
+                for _ in 0..RAND_BENCH_N {
+                    black_box(rng.gen::<$ty>());
+                }
+            });
+            b.bytes = size_of::<$ty>() as u64 * RAND_BENCH_N;
+        }
+    }
+}
+
+macro_rules! gen_uint_new {
+    ($fnn:ident, $ty:ty, $gen:ident) => {
+        #[bench]
+        fn $fnn(b: &mut Bencher) {
+            let mut rng = $gen::new().unwrap();
+            b.iter(|| {
+                for _ in 0..RAND_BENCH_N {
+                    black_box(rng.gen::<$ty>());
+                }
+            });
+            b.bytes = size_of::<$ty>() as u64 * RAND_BENCH_N;
+        }
+    }
+}
+
+gen_uint!(gen_u32_xorshift, u32, XorShiftRng);
+gen_uint!(gen_u32_isaac, u32, IsaacRng);
+gen_uint!(gen_u32_isaac64, u32, Isaac64Rng);
+gen_uint!(gen_u32_chacha, u32, ChaChaRng);
+gen_uint_new!(gen_u32_std, u32, StdRng);
+gen_uint_new!(gen_u32_os, u32, OsRng);
+
+gen_uint!(gen_u64_xorshift, u64, XorShiftRng);
+gen_uint!(gen_u64_isaac, u64, IsaacRng);
+gen_uint!(gen_u64_isaac64, u64, Isaac64Rng);
+gen_uint!(gen_u64_chacha, u64, ChaChaRng);
+gen_uint_new!(gen_u64_std, u64, StdRng);
+gen_uint_new!(gen_u64_os, u64, OsRng);
+
+#[bench]
+fn gen_u64_jitter(b: &mut Bencher) {
+    let mut rng = JitterRng::new().unwrap();
+    b.iter(|| {
+        black_box(rng.gen::<u64>());
+    });
+    b.bytes = size_of::<u64>() as u64;
+}
+
+macro_rules! init_gen {
+    ($fnn:ident, $gen:ident) => {
+        #[bench]
+        fn $fnn(b: &mut Bencher) {
+            let mut rng: XorShiftRng = OsRng::new().unwrap().gen();
+            b.iter(|| {
+                let r2: $gen = rng.gen();
+                black_box(r2);
+            });
+        }
+    }
+}
+
+init_gen!(init_xorshift, XorShiftRng);
+init_gen!(init_isaac, IsaacRng);
+init_gen!(init_isaac64, Isaac64Rng);
+init_gen!(init_chacha, ChaChaRng);
+
+#[bench]
+fn init_jitter(b: &mut Bencher) {
+    b.iter(|| {
+        black_box(JitterRng::new().unwrap());
+    });
+}