add iai benchmarks

bench/iai/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "bench-iai"
+version = "0.1.0"
+edition = "2021"
+
+[dev-dependencies]
+iai = { version = "0.1", default-features = false }
+bench-input = { path = "../input" }
+jotdown = { path = "../../", features = ["html", "deterministic"] }
+
+[[bench]]
+name = "iai"
+path = "main.rs"
+harness = false

bench/iai/main.rs

@@ -0,0 +1,21 @@
+use iai::black_box;
+
+use jotdown::Render;
+
+fn block() -> jotdown::Parser<'static> {
+    jotdown::Parser::new(black_box(bench_input::ALL))
+}
+
+fn block_inline() -> Option<jotdown::Event<'static>> {
+    black_box(jotdown::Parser::new(black_box(bench_input::ALL))).last()
+}
+
+fn full() -> String {
+    let mut s = String::new();
+    jotdown::html::Renderer
+        .push(jotdown::Parser::new(bench_input::ALL), &mut s)
+        .unwrap();
+    s
+}
+
+iai::main!(block, block_inline, full);