performance progress tracking

benches/perft.rs

@@ -0,0 +1,36 @@
+use chess_engine::board::Board;
+use chess_engine::movegen::generate_pseudo_legal_moves;
+use chess_engine::movegen::legal_check::is_other_king_attacked;
+use chess_engine::r#move::MoveList;
+use criterion::{criterion_group, criterion_main, Criterion};
+
+fn count_legal_moves_recursive(board: &mut Board, depth: u8) -> u64 {
+    if depth == 0 {
+        return 1_u64;
+    }
+    let mut list = MoveList::new();
+    generate_pseudo_legal_moves(&board, &mut list);
+    let mut leaf_nodes = 0_u64;
+    for mv in list.iter() {
+        let undo_info = board.make_move(*mv);
+        if !is_other_king_attacked(board) {
+            leaf_nodes += count_legal_moves_recursive(board, depth - 1);
+        }
+        board.undo_move(undo_info);
+    }
+    leaf_nodes
+}
+
+
+fn run_perft_benchmark(c: &mut Criterion) {
+    let mut board = Board::from_fen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
+
+    c.bench_function("standard_perft5", |b| {
+        b.iter(|| {
+            assert_eq!(count_legal_moves_recursive(&mut board, 5), 4865609);
+        })
+    });
+}
+
+criterion_group!(benches, run_perft_benchmark);
+criterion_main!(benches);