2012-06-03 20:36:43 -07:00
|
|
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
2012-02-29 18:40:47 -08:00
|
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
|
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
|
|
|
|
* You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* MOZ_LIKELY and MOZ_UNLIKELY macros to hint to the compiler how a
|
|
|
|
|
* boolean predicate should be branch-predicted.
|
|
|
|
|
*/
|
|
|
|
|
|
2012-06-03 20:36:43 -07:00
|
|
|
#ifndef mozilla_Likely_h_
|
|
|
|
|
#define mozilla_Likely_h_
|
2012-03-01 21:20:32 -08:00
|
|
|
|
2012-12-18 10:22:28 -08:00
|
|
|
#if defined(__clang__) || defined(__GNUC__)
|
2012-09-20 04:17:05 -07:00
|
|
|
# define MOZ_LIKELY(x) (__builtin_expect(!!(x), 1))
|
|
|
|
|
# define MOZ_UNLIKELY(x) (__builtin_expect(!!(x), 0))
|
2012-02-29 18:40:47 -08:00
|
|
|
#else
|
2012-09-20 04:17:05 -07:00
|
|
|
# define MOZ_LIKELY(x) (!!(x))
|
|
|
|
|
# define MOZ_UNLIKELY(x) (!!(x))
|
2012-02-29 18:40:47 -08:00
|
|
|
#endif
|
|
|
|
|
|
2012-06-03 20:36:43 -07:00
|
|
|
#endif /* mozilla_Likely_h_ */
|
