Create contract root bench

benches/Cargo.toml

@@ -51,3 +51,7 @@ name = "block_target_gas"
 [[bench]]
 harness = false
 name = "transaction_throughput"
+
+[[bench]]
+harness = false
+name = "contract_root"

benches/benches/contract_root.rs

@@ -0,0 +1,48 @@
+use criterion::{
+    criterion_group,
+    criterion_main,
+    Criterion,
+};
+use fuel_core_types::fuel_tx::Contract;
+use rand::{
+    rngs::StdRng,
+    Rng,
+    SeedableRng,
+};
+use std::time::Duration;
+
+// 17 mb contract size
+const MAX_CONTRACT_SIZE: usize = 17 * 1024 * 1024;
+
+fn random_bytes<const N: usize, R: Rng + ?Sized>(rng: &mut R) -> Box<[u8; N]> {
+    let mut bytes = Box::new([0u8; N]);
+    for chunk in bytes.chunks_mut(32) {
+        rng.fill(chunk);
+    }
+    bytes
+}
+
+fn contract_root_from_code(c: &mut Criterion) {
+    let rng = &mut StdRng::seed_from_u64(8586);
+
+    let mut group = c.benchmark_group("contract_root");
+
+    group.bench_function("root-from-set", |b| {
+        b.iter_custom(|iters| {
+            let mut elapsed_time = Duration::default();
+            for _ in 0..iters {
+                let bytes = random_bytes::<MAX_CONTRACT_SIZE, _>(rng);
+                let contract = Contract::from(bytes.as_slice());
+                let start = std::time::Instant::now();
+                contract.root();
+                elapsed_time += start.elapsed();
+            }
+            elapsed_time
+        })
+    });
+
+    group.finish();
+}
+
+criterion_group!(benches, contract_root_from_code);
+criterion_main!(benches);