1 files changed, 62 insertions, 0 deletions
diff --git a/hicn-light/src/hicn/base/common.h b/hicn-light/src/hicn/base/common.h
new file mode 100644
index 000000000..996050308
--- /dev/null
+++ b/hicn-light/src/hicn/base/common.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * 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.
+ */
+
+/**
+ * \file array.h
+ * \brief Fixed-size pool allocator
+ */
+
+#ifndef UTIL_COMMON_H
+#define UTIL_COMMON_H
+
+#define round_pow2(x, pow2) ((x + pow2 - 1) & ~(pow2 - 1))
+
+#define _SIZEOF_ALIGNED(x, size) round_pow2(sizeof(x), size)
+#define SIZEOF_ALIGNED(x) _SIZEOF_ALIGNED(x, sizeof(void*))
+
+/* Definitions for builtins unavailable on MSVC */
+#if defined(_MSC_VER) && !defined(__clang__)
+#include <intrin.h>
+
+uint32_t __inline __builtin_ctz(uint32_t value) {
+  uint32_t trailing_zero = 0;
+  if (_BitScanForward(&trailing_zero, value))
+    return trailing_zero;
+  else
+    return 32;
+}
+
+uint32_t __inline __builtin_clz(uint32_t value) {
+  uint32_t leading_zero = 0;
+  if (_BitScanReverse(&leading_zero, value))
+    return 31 - leading_zero;
+  else
+    return 32;
+}
+
+uint32_t __inline __builtin_clzll(uint64_t value) {
+  uint32_t leading_zero = 0;
+  if (_BitScanReverse64(&leading_zero, value))
+    return 63 - leading_zero;
+  else
+    return 64;
+}
+
+#define __builtin_clzl __builtin_clzll
+#endif
+
+#define next_pow2(x) (x == 1 ? 1 : 1<<(64-__builtin_clzl(x-1)))
+
+#endif /* UTIL_COMMON_H */