tools/perf/util/include/linux/bitmap.h

   1 #ifndef _PERF_BITOPS_H
   2 #define _PERF_BITOPS_H
   3
   4 #include <string.h>
   5 #include <linux/bitops.h>
   6
   7 #define DECLARE_BITMAP(name,bits) \
   8         unsigned long name[BITS_TO_LONGS(bits)]
   9
  10 int __bitmap_weight(const unsigned long *bitmap, int bits);
  11 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
  12                  const unsigned long *bitmap2, int bits);
  13
  14 #define BITMAP_LAST_WORD_MASK(nbits)                                    \
  15 (                                                                       \
  16         ((nbits) % BITS_PER_LONG) ?                                     \
  17                 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  18 )
  19
  20 #define small_const_nbits(nbits) \
  21         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  22
  23 static inline void bitmap_zero(unsigned long *dst, int nbits)
  24 {
  25         if (small_const_nbits(nbits))
  26                 *dst = 0UL;
  27         else {
  28                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  29                 memset(dst, 0, len);
  30         }
  31 }
  32
  33 static inline int bitmap_weight(const unsigned long *src, int nbits)
  34 {
  35         if (small_const_nbits(nbits))
  36                 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  37         return __bitmap_weight(src, nbits);
  38 }
  39
  40 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  41                              const unsigned long *src2, int nbits)
  42 {
  43         if (small_const_nbits(nbits))
  44                 *dst = *src1 | *src2;
  45         else
  46                 __bitmap_or(dst, src1, src2, nbits);
  47 }
  48
  49 #endif /* _PERF_BITOPS_H */