intrin.h

 
#ifndef WINPR_INTRIN_H
#define WINPR_INTRIN_H
 
#if !defined(_WIN32) || defined(__MINGW32__) || defined(_M_ARM64)
 
#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
 
static INLINE UINT32 __lzcnt(UINT32 _val32)
{
  return ((UINT32)__builtin_clz(_val32));
}
 
#if !(defined(__MINGW32__) && defined(__clang__))
static INLINE UINT16 __lzcnt16(UINT16 _val16)
{
  return ((UINT16)(__builtin_clz((UINT32)_val16) - 16));
}
#endif /* !(defined(__MINGW32__) && defined(__clang__)) */
 
#else /* (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2) */
 
static INLINE UINT32 __lzcnt(UINT32 x)
{
  unsigned y;
  int n = 32;
  y = x >> 16;
  if (y != 0)
  {
    n = n - 16;
    x = y;
  }
  y = x >> 8;
  if (y != 0)
  {
    n = n - 8;
    x = y;
  }
  y = x >> 4;
  if (y != 0)
  {
    n = n - 4;
    x = y;
  }
  y = x >> 2;
  if (y != 0)
  {
    n = n - 2;
    x = y;
  }
  y = x >> 1;
  if (y != 0)
    return n - 2;
  return n - x;
}
 
static INLINE UINT16 __lzcnt16(UINT16 x)
{
  return ((UINT16)__lzcnt((UINT32)x));
}
 
#endif /* (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2) */
 
#endif /* !defined(_WIN32) || defined(__MINGW32__) */
 
#endif /* WINPR_INTRIN_H */