Criterion testing

Cargo.toml

@@ -45,8 +45,8 @@ codegen-units = 1
 opt-level = 3
 
 [dev-dependencies]
-diol = "0.8.2"
+criterion = { version = "0.5" }
 
 [[bench]]
+name = "fibonacci"
 harness = false
-name = "compare"

benches/fibonacci.rs

@@ -0,0 +1,17 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::hint::black_box;
+
+fn fibonacci(n: u64) -> u64 {
+    match n {
+        0 => 1,
+        1 => 1,
+        n => fibonacci(n - 1) + fibonacci(n - 2),
+    }
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("fib 20", |b| b.iter(|| fibonacci(black_box(20))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);