mfbt/Likely.h
author J. Ryan Stinnett <jryans@gmail.com>
Tue, 28 Jun 2016 17:57:24 -0500
changeset 303370 9b0be364ac5445e5712e79651720ad70269ca9b9
parent 139692 f55906cadf07a9ef44cc4ce2574fe35f3dc85672
permissions -rw-r--r--
Bug 1283583 - Clean up code style in devtools/server/child.js. r=ochameau MozReview-Commit-ID: GoHv6jvX6M1

/* -*- 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 */