[rs] try benchmark with divan

rs/Cargo.toml

@@ -14,7 +14,15 @@ anyhow = "1"
 clap = { version = "4.5.4", features = ["derive"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+divan = "0.1.0"
 
 [profile.release-lto]
 inherits = "release"
-lto = true
+lto = true
+
+[dev-dependencies]
+divan = "0.1.0"
+
+[[bench]]
+name = "scratch"
+harness = false

rs/README.md

@@ -9,6 +9,13 @@ Usage
 ./rosettaboy-release game.gb
 ```
 
+Benchmarks
+----------
+To benchmark a couple of internal bits:
+```
+cargo bench
+```
+
 Requirements
 ------------
 - SDL2

rs/benches/scratch.rs

@@ -0,0 +1,36 @@
+use clap::Parser;
+
+fn main() {
+    divan::main();
+}
+
+#[divan::bench]
+fn tick(bencher: divan::Bencher) {
+    let args = rosettaboy_rs::args::Args::parse_from(
+        [
+            "rosettaboy_rs",
+            "--silent",
+            "--headless",
+            "--turbo",
+            "../gb-autotest-roms/blargg-cpu-instructions/01-special.gb",
+        ]
+        .iter(),
+    );
+    let mut gb = rosettaboy_rs::gameboy::GameBoy::new(args).unwrap();
+    bencher.bench_local(|| gb.tick().unwrap());
+}
+
+#[divan::bench]
+fn ram_get() -> u64 {
+    let ram = rosettaboy_rs::ram::RAM::new(
+        rosettaboy_rs::cart::Cart::new("../gb-autotest-roms/blargg-cpu-instructions/01-special.gb")
+            .unwrap(),
+        false,
+    )
+    .unwrap();
+    let mut sum = 0;
+    for i in 0..0x3FFF {
+        sum += ram.get(i as u16);
+    }
+    sum as u64
+}

rs/src/lib.rs

@@ -0,0 +1,11 @@
+pub mod apu;
+pub mod args;
+pub mod buttons;
+pub mod cart;
+pub mod clock;
+pub mod consts;
+pub mod cpu;
+pub mod errors;
+pub mod gameboy;
+pub mod gpu;
+pub mod ram;