add growing benchmark

benches/large_grid.rs

@@ -1,17 +0,0 @@
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
-use gol_bitwise::region::Region;
-
-fn large_grid(c: &mut Criterion) {
-	const SIZE: usize = 2048 / gol_bitwise::tile::WIDTH; // same number of cells regardless of tile size
-	let mut region = black_box(Region::new(SIZE, SIZE));
-	region.randomise();
-
-	c.bench_function("large grid", |b| {
-		b.iter(|| {
-			region.step();
-		})
-	});
-}
-
-criterion_group!(benches, large_grid);
-criterion_main!(benches);

benches/main.rs

@@ -0,0 +1,33 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use gol_bitwise::{
+	region::Region,
+	tile::{self, Tile},
+};
+
+fn large_grid(c: &mut Criterion) {
+	const SIZE: usize = 2048 / tile::WIDTH; // same number of cells regardless of tile size
+	let mut region = black_box(Region::new(SIZE, SIZE));
+	region.randomise();
+
+	c.bench_function("large grid", |b| {
+		b.iter(|| {
+			region.step();
+		})
+	});
+}
+
+fn growing(c: &mut Criterion) {
+	c.bench_function("growing", |b| {
+		b.iter(|| {
+			let mut region = black_box(Region::new(1, 1));
+			region.set_tile(Tile::gliders(), 0, 0);
+			for _ in 0..1024 {
+				region.step();
+				region.auto_grow();
+			}
+		})
+	});
+}
+
+criterion_group!(benches, large_grid, growing);
+criterion_main!(benches);