1 files changed, 62 insertions, 0 deletions
diff --git a/third_party/rust/ryu/benches/bench.rs b/third_party/rust/ryu/benches/bench.rs
new file mode 100644
index 0000000000..fbc1b7067b
--- /dev/null
+++ b/third_party/rust/ryu/benches/bench.rs
@@ -0,0 +1,62 @@
+// cargo bench
+
+#![feature(test)]
+#![allow(
+    clippy::approx_constant,
+    clippy::excessive_precision,
+    clippy::unreadable_literal
+)]
+
+extern crate test;
+
+use std::io::Write;
+use std::{f32, f64};
+use test::{black_box, Bencher};
+
+macro_rules! benches {
+    ($($name:ident($value:expr),)*) => {
+        mod bench_ryu {
+            use super::*;
+            $(
+                #[bench]
+                fn $name(b: &mut Bencher) {
+                    let mut buf = ryu::Buffer::new();
+
+                    b.iter(move || {
+                        let value = black_box($value);
+                        let formatted = buf.format_finite(value);
+                        black_box(formatted);
+                    });
+                }
+            )*
+        }
+
+        mod bench_std_fmt {
+            use super::*;
+            $(
+                #[bench]
+                fn $name(b: &mut Bencher) {
+                    let mut buf = Vec::with_capacity(20);
+
+                    b.iter(|| {
+                        buf.clear();
+                        let value = black_box($value);
+                        write!(&mut buf, "{}", value).unwrap();
+                        black_box(buf.as_slice());
+                    });
+                }
+            )*
+        }
+    };
+}
+
+benches! {
+    bench_0_f64(0f64),
+    bench_short_f64(0.1234f64),
+    bench_e_f64(2.718281828459045f64),
+    bench_max_f64(f64::MAX),
+    bench_0_f32(0f32),
+    bench_short_f32(0.1234f32),
+    bench_e_f32(2.718281828459045f32),
+    bench_max_f32(f32::MAX),
+}