#ifndef COM_BITS_H
#define COM_BITS_H

#include "def.h"
#include <assert.h>
#include <stdint.h>

/* How many bits needed to represent a given number */
/* Alternitive semntic: nearest upper power of two */
static inline int com_bits_needed(uint32_t v) {
#ifdef COM_DEF_COMPILE_MODERN
  /* Use intrinsic, required for fast sqrt impl */
  return v == 0 ? 1 : 32 - __builtin_clz(v);
#else
#endif
  if (v == 0)
    return 1;

  v--;
  v |= v >> 1;
  v |= v >> 2;
  v |= v >> 4;
  v |= v >> 8;
  v |= v >> 16;
  v++;

  return v;
}

#endif