From 3de1923d5d3aad5c4bb0914f054e950bf166aa00 Mon Sep 17 00:00:00 2001
From: Andrea Canciani <ranma42@gmail.com>
Date: Mon, 16 Dec 2019 15:33:16 +0100
Subject: [PATCH] Add benchmarks for `start_with` and `ends_with`

---
 src/libcore/benches/lib.rs     |  1 +
 src/libcore/benches/pattern.rs | 43 ++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 src/libcore/benches/pattern.rs

diff --git a/src/libcore/benches/lib.rs b/src/libcore/benches/lib.rs
index 6932c7fe221d..570fc4ab9339 100644
--- a/src/libcore/benches/lib.rs
+++ b/src/libcore/benches/lib.rs
@@ -11,4 +11,5 @@ mod hash;
 mod iter;
 mod num;
 mod ops;
+mod pattern;
 mod slice;
diff --git a/src/libcore/benches/pattern.rs b/src/libcore/benches/pattern.rs
new file mode 100644
index 000000000000..a49490cec121
--- /dev/null
+++ b/src/libcore/benches/pattern.rs
@@ -0,0 +1,43 @@
+use test::black_box;
+use test::Bencher;
+
+#[bench]
+fn starts_with_char(b: &mut Bencher) {
+    let text = black_box("kdjsfhlakfhlsghlkvcnljknfqiunvcijqenwodind");
+    b.iter(|| {
+        for _ in 0..1024 {
+            black_box(text.starts_with('k'));
+        }
+    })
+}
+
+#[bench]
+fn starts_with_str(b: &mut Bencher) {
+    let text = black_box("kdjsfhlakfhlsghlkvcnljknfqiunvcijqenwodind");
+    b.iter(|| {
+        for _ in 0..1024 {
+            black_box(text.starts_with("k"));
+        }
+    })
+}
+
+
+#[bench]
+fn ends_with_char(b: &mut Bencher) {
+    let text = black_box("kdjsfhlakfhlsghlkvcnljknfqiunvcijqenwodind");
+    b.iter(|| {
+        for _ in 0..1024 {
+            black_box(text.ends_with('k'));
+        }
+    })
+}
+
+#[bench]
+fn ends_with_str(b: &mut Bencher) {
+    let text = black_box("kdjsfhlakfhlsghlkvcnljknfqiunvcijqenwodind");
+    b.iter(|| {
+        for _ in 0..1024 {
+            black_box(text.ends_with("k"));
+        }
+    })
+}