mfbt/Likely.h
author ffxbld
Mon, 22 Jul 2013 19:57:56 -0400
branchGECKO230b8_2013072219_RELBRANCH
changeset 143965 f0b2995e7a4bbf1dc1e7e8249a221eebf113c79c
parent 127030 4ebea4d88d4872cce65c9913492e8e2389e4e107
child 152848 f55906cadf07a9ef44cc4ce2574fe35f3dc85672
permissions -rw-r--r--
Added FIREFOX_23_0b8_RELEASE FIREFOX_23_0b8_BUILD1 tag(s) for changeset 8b103274f2d1. DONTBUILD CLOSED TREE a=release

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