1 files changed, 53 insertions, 0 deletions
diff --git a/third_party/rust/crc32fast/benches/bench.rs b/third_party/rust/crc32fast/benches/bench.rs
new file mode 100644
index 0000000000..53b3d838ea
--- /dev/null
+++ b/third_party/rust/crc32fast/benches/bench.rs
@@ -0,0 +1,53 @@
+#[macro_use]
+extern crate bencher;
+extern crate crc32fast;
+extern crate rand;
+
+use bencher::Bencher;
+use crc32fast::Hasher;
+use rand::Rng;
+
+fn bench(b: &mut Bencher, size: usize, hasher_init: Hasher) {
+    let mut bytes = vec![0u8; size];
+    rand::thread_rng().fill(&mut bytes[..]);
+
+    b.iter(|| {
+        let mut hasher = hasher_init.clone();
+        hasher.update(&bytes);
+        bencher::black_box(hasher.finalize())
+    });
+
+    b.bytes = size as u64;
+}
+
+fn bench_kilobyte_baseline(b: &mut Bencher) {
+    bench(b, 1024, Hasher::internal_new_baseline(0, 0))
+}
+
+fn bench_kilobyte_specialized(b: &mut Bencher) {
+    bench(b, 1024, Hasher::internal_new_specialized(0, 0).unwrap())
+}
+
+fn bench_megabyte_baseline(b: &mut Bencher) {
+    bench(b, 1024 * 1024, Hasher::internal_new_baseline(0, 0))
+}
+
+fn bench_megabyte_specialized(b: &mut Bencher) {
+    bench(
+        b,
+        1024 * 1024,
+        Hasher::internal_new_specialized(0, 0).unwrap(),
+    )
+}
+
+benchmark_group!(
+    bench_baseline,
+    bench_kilobyte_baseline,
+    bench_megabyte_baseline
+);
+benchmark_group!(
+    bench_specialized,
+    bench_kilobyte_specialized,
+    bench_megabyte_specialized
+);
+benchmark_main!(bench_baseline, bench_specialized);