mfbt/Likely.h
author Ted Mielczarek <ted@mielczarek.org>
Wed, 14 Nov 2012 10:52:55 -0500
changeset 121167 3c17914da5d653bf750cdc19df9efab12f1ed093
parent 114000 7ffcbd67d18d72b45380f0cc3a48123bbe8f85a5
child 126275 4ebea4d88d4872cce65c9913492e8e2389e4e107
permissions -rw-r--r--
bug 811370 - runcppunittests doesn't handle hangs gracefully. r=ahal

/* -*- 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__) && (__GNUC__ > 2))
#  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_ */