Add extra benchmark missing from rust-random#1530

benches/benches/seq_choose.rs

@@ -52,6 +52,30 @@ pub fn bench(c: &mut Criterion) {
         });
     }
 
+    let lens = [(1, 1000), (950, 1000), (10, 100), (90, 100)];
+    for (amount, len) in lens {
+        let name = format!("seq_slice_choose_multiple_weighted_{}_of_{}", amount, len);
+        c.bench_function(name.as_str(), |b| {
+            let mut rng = Pcg32::from_rng(&mut rand::rng());
+            let mut buf = [0i32; 1000];
+            rng.fill(&mut buf);
+            let x = black_box(&buf[..len]);
+
+            let mut results_buf = [0i32; 950];
+            let y = black_box(&mut results_buf[..amount]);
+            let amount = black_box(amount);
+
+            b.iter(|| {
+                // Collect full result to prevent unwanted shortcuts getting
+                // first element (in case sample_indices returns an iterator).
+                for (slot, sample) in y.iter_mut().zip(x.choose_multiple_weighted(&mut rng, amount, |_| 1.0).unwrap()) {
+                    *slot = *sample;
+                }
+                y[amount - 1]
+            })
+        });
+    }
+
     c.bench_function("seq_iter_choose_multiple_10_of_100", |b| {
         let mut rng = Pcg32::from_rng(&mut rand::rng());
         let mut buf = [0i32; 100];