Likely.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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.

*/

#ifndef mozilla_Likely_h

#define mozilla_Likely_h

#if defined(__clang__) || defined(__GNUC__)

#  define MOZ_LIKELY(x) (__builtin_expect(!!(x), 1))

#  define MOZ_UNLIKELY(x) (__builtin_expect(!!(x), 0))

#else

#  define MOZ_LIKELY(x) (!!(x))

#  define MOZ_UNLIKELY(x) (!!(x))

#endif

#endif /* mozilla_Likely_h */