perf(ext/web): Add fast path for non-streaming TextDecoder (#14217)

Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/ext/web/benches/encoding.rs b/ext/web/benches/encoding.rs
new file mode 100644
index 000000000..5b8b2a988
--- /dev/null
+++ b/ext/web/benches/encoding.rs
@@ -0,0 +1,54 @@
+use deno_core::Extension;
+
+use deno_bench_util::bench_js_sync;
+use deno_bench_util::bench_or_profile;
+use deno_bench_util::bencher::{benchmark_group, Bencher};
+use deno_web::BlobStore;
+
+struct Permissions;
+
+impl deno_web::TimersPermission for Permissions {
+  fn allow_hrtime(&mut self) -> bool {
+    false
+  }
+  fn check_unstable(
+    &self,
+    _state: &deno_core::OpState,
+    _api_name: &'static str,
+  ) {
+    unreachable!()
+  }
+}
+
+fn setup() -> Vec<Extension> {
+  vec![
+    deno_webidl::init(),
+    deno_url::init(),
+    deno_web::init::<Permissions>(BlobStore::default(), None),
+    Extension::builder()
+      .js(vec![(
+        "setup",
+        Box::new(|| {
+          Ok(
+            r#"
+        const { TextDecoder } = globalThis.__bootstrap.encoding;
+        const hello12k = Deno.core.encode("hello world\n".repeat(1e3));
+        "#
+            .to_owned(),
+          )
+        }),
+      )])
+      .state(|state| {
+        state.put(Permissions {});
+        Ok(())
+      })
+      .build(),
+  ]
+}
+
+fn bench_encode_12kb(b: &mut Bencher) {
+  bench_js_sync(b, r#"new TextDecoder().decode(hello12k);"#, setup);
+}
+
+benchmark_group!(benches, bench_encode_12kb);
+bench_or_profile!(benches);