add some code

managed_components/espressif__esp-dsp/modules/common/misc/dsps_pwroftwo.cpp

@@ -0,0 +1,31 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "dsp_common.h"
+
+bool dsp_is_power_of_two(int x)
+{
+    return (x != 0) && ((x & (x - 1)) == 0);
+}
+
+int dsp_power_of_two(int x)
+{
+    for (size_t i = 0; i < 32; i++) {
+        x = x >> 1;
+        if (0 == x) {
+            return i;
+        }
+    }
+    return 0;
+}