cutils/bitops.h

   1 /*
   2  * Copyright (C) 2011 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef __CUTILS_BITOPS_H
  18 #define __CUTILS_BITOPS_H
  19
  20 #include <sys/cdefs.h>
  21
  22 __BEGIN_DECLS
  23
  24 static inline int popcount(unsigned int x)
  25 {
  26     return __builtin_popcount(x);
  27 }
  28
  29 static inline int popcountl(unsigned long x)
  30 {
  31     return __builtin_popcountl(x);
  32 }
  33
  34 static inline int popcountll(unsigned long long x)
  35 {
  36     return __builtin_popcountll(x);
  37 }
  38
  39 __END_DECLS
  40
  41 #endif /* __CUTILS_BITOPS_H */