core/vm/runtime: benchmark

core/vm/runtime/runtime_test.go

@@ -316,3 +316,31 @@ func TestBlockhash(t *testing.T) {
 		t.Errorf("suboptimal; too much chain iteration, expected %d, got %d", exp, got)
 	}
 }
+
+// BenchmarkSimpleLoop test a pretty simple loop which loops
+// 1M (1 048 575) times.
+// Takes about 200 ms
+func BenchmarkSimpleLoop(b *testing.B) {
+	// 0xfffff = 1048575 loops
+	code := []byte{
+		byte(vm.PUSH3), 0x0f, 0xff, 0xff,
+		byte(vm.JUMPDEST), //  [ count ]
+		byte(vm.PUSH1), 1, // [count, 1]
+		byte(vm.SWAP1),    // [1, count]
+		byte(vm.SUB),      // [ count -1 ]
+		byte(vm.DUP1),     //  [ count -1 , count-1]
+		byte(vm.PUSH1), 4, // [count-1, count -1, label]
+		byte(vm.JUMPI), // [ 0 ]
+		byte(vm.STOP),
+	}
+	//tracer := vm.NewJSONLogger(nil, os.Stdout)
+	//Execute(code, nil, &Config{
+	//	EVMConfig: vm.Config{
+	//		Debug:  true,
+	//		Tracer: tracer,
+	//	}})
+
+	for i := 0; i < b.N; i++ {
+		Execute(code, nil, nil)
+	}
+}