ceph/src/common/likely.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2010 Dreamhost
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #ifndef CEPH_LIKELY_DOT_H
  16 #define CEPH_LIKELY_DOT_H
  17
  18 /*
  19  * Likely / Unlikely macros
  20  */
  21 #ifndef likely
  22 #define likely(x)       __builtin_expect((x),1)
  23 #endif
  24 #ifndef unlikely
  25 #define unlikely(x)     __builtin_expect((x),0)
  26 #endif
  27 #ifndef expect
  28 #define expect(x, hint) __builtin_expect((x),(hint))
  29 #endif
  30
  31 #endif