1 files changed, 54 insertions, 0 deletions
diff --git a/compiler/rustc_middle/benches/lib.rs b/compiler/rustc_middle/benches/lib.rs
new file mode 100644
index 000000000..237751bcb
--- /dev/null
+++ b/compiler/rustc_middle/benches/lib.rs
@@ -0,0 +1,54 @@
+#![feature(test)]
+
+extern crate test;
+
+use test::Bencher;
+
+// Static/dynamic method dispatch
+
+struct Struct {
+    field: isize,
+}
+
+trait Trait {
+    fn method(&self) -> isize;
+}
+
+impl Trait for Struct {
+    fn method(&self) -> isize {
+        self.field
+    }
+}
+
+#[bench]
+fn trait_vtable_method_call(b: &mut Bencher) {
+    let s = Struct { field: 10 };
+    let t = &s as &dyn Trait;
+    b.iter(|| t.method());
+}
+
+#[bench]
+fn trait_static_method_call(b: &mut Bencher) {
+    let s = Struct { field: 10 };
+    b.iter(|| s.method());
+}
+
+// Overhead of various match forms
+
+#[bench]
+fn option_some(b: &mut Bencher) {
+    let x = Some(10);
+    b.iter(|| match x {
+        Some(y) => y,
+        None => 11,
+    });
+}
+
+#[bench]
+fn vec_pattern(b: &mut Bencher) {
+    let x = [1, 2, 3, 4, 5, 6];
+    b.iter(|| match x {
+        [1, 2, 3, ..] => 10,
+        _ => 11,
+    });
+}