Fix instr benchmark

substrate/frame/revive/fixtures/contracts/instr_benchmark.rs

@@ -22,20 +22,22 @@ extern crate common;
 use common::input;
 use uapi::{HostFn, HostFnImpl as api, ReturnFlags};
 
+static mut MULT: [u32; 5_000] = [1u32; 5_000];
+
 #[no_mangle]
 #[polkavm_derive::polkavm_export]
 pub extern "C" fn deploy() {}
 
 #[no_mangle]
 #[polkavm_derive::polkavm_export]
 pub extern "C" fn call() {
-	input!(rounds: u32, start: u32, div: u32, mult: u32, add: u32, );
+	input!(rounds: u32, );
 
-	let mut acc = start;
+	let mut acc = 5;
 
-	for _ in 0..rounds {
-		acc = acc / div * mult + add;
+	for i in 0..rounds {
+		acc = acc * unsafe { MULT[i as usize] }
 	}
 
-	api::return_value(ReturnFlags::empty(), start.to_le_bytes().as_ref());
+	api::return_value(ReturnFlags::empty(), acc.to_le_bytes().as_ref());
 }

substrate/frame/revive/src/benchmarking/mod.rs

@@ -1727,11 +1727,9 @@ mod benchmarks {
 	// Benchmark the execution of instructions.
 	#[benchmark(pov_mode = Ignored)]
 	fn instr(r: Linear<0, INSTR_BENCHMARK_RUNS>) {
-		// (round, start, div, mult, add)
-		let input = (r, 1_000u32, 2u32, 3u32, 100u32).encode();
 		let mut setup = CallSetup::<T>::new(WasmModule::instr());
 		let (mut ext, module) = setup.ext();
-		let prepared = CallSetup::<T>::prepare_call(&mut ext, module, input);
+		let prepared = CallSetup::<T>::prepare_call(&mut ext, module, r.encode());
 		#[block]
 		{
 			prepared.call().unwrap();