Add a simple benchmark to demonstrate that the macro helps

lukesandberg · lukesandberg · commit ac7393df4c53 · 2025-05-30T17:00:27.000-07:00
diff --git a/turbopack/crates/turbo-rcstr/benches/mod.rs b/turbopack/crates/turbo-rcstr/benches/mod.rs
@@ -1,5 +1,5 @@
 use criterion::{BatchSize, BenchmarkId, Criterion, criterion_group, criterion_main};
-use turbo_rcstr::RcStr;
+use turbo_rcstr::{RcStr, rcstr};
 
 // map has a fast-path if the Arc is uniquely owned
 fn bench_map(c: &mut Criterion) {
@@ -30,9 +30,26 @@ fn bench_map(c: &mut Criterion) {
     }
 }
 
+/// Compare the performance of `from` and `rcstr!`
+fn bench_construct(c: &mut Criterion) {
+    let mut g = c.benchmark_group("Rcstr::construct");
+    g.bench_with_input("rcstr!/small", "small", |f, _| {
+        f.iter(|| rcstr!("hello"));
+    });
+    g.bench_with_input("rcstr!/large", "large", |f, _| {
+        f.iter(|| rcstr!("this is a long string that will take time to copy"));
+    });
+
+    g.bench_with_input("from/small", "small", |f, _| {
+        f.iter(|| RcStr::from("hello"));
+    });
+    g.bench_with_input("from/large", "large", |f, _| {
+        f.iter(|| RcStr::from("this is a long string that will take time to copy"));
+    });
+}
 criterion_group!(
   name = benches;
   config = Criterion::default();
-  targets = bench_map,
+  targets = bench_map,bench_construct,
 );
 criterion_main!(benches);
