X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=library%2Falloc%2Fbenches%2Fvec_deque.rs;h=7c78561ebf10946064861d753a9268188afde5ce;hb=43dd0e2424a1086e0d9d649f717b3646da6586b6;hp=6660380e4beb0d1ab28763728fea87587468e8e1;hpb=6c6958b5315961deb569505b97db34abd5d7f392;p=rust.git

diff --git a/library/alloc/benches/vec_deque.rs b/library/alloc/benches/vec_deque.rs
index 6660380e4be..7c78561ebf1 100644
--- a/library/alloc/benches/vec_deque.rs
+++ b/library/alloc/benches/vec_deque.rs
@@ -91,3 +91,35 @@ fn bench_extend_vec(b: &mut Bencher) {
         ring.extend(black_box(input));
     });
 }
+
+#[bench]
+fn bench_extend_trustedlen(b: &mut Bencher) {
+    let mut ring: VecDeque<u16> = VecDeque::with_capacity(1000);
+
+    b.iter(|| {
+        ring.clear();
+        ring.extend(black_box(0..512));
+    });
+}
+
+#[bench]
+fn bench_extend_chained_trustedlen(b: &mut Bencher) {
+    let mut ring: VecDeque<u16> = VecDeque::with_capacity(1000);
+
+    b.iter(|| {
+        ring.clear();
+        ring.extend(black_box((0..256).chain(768..1024)));
+    });
+}
+
+#[bench]
+fn bench_extend_chained_bytes(b: &mut Bencher) {
+    let mut ring: VecDeque<u16> = VecDeque::with_capacity(1000);
+    let input1: &[u16] = &[128; 256];
+    let input2: &[u16] = &[255; 256];
+
+    b.iter(|| {
+        ring.clear();
+        ring.extend(black_box(input1.iter().chain(input2.iter())));
+    });
+}