mfbt/Likely.h
author Ralph Giles <giles@mozilla.com>
Thu, 22 Feb 2018 11:49:13 -0800
changeset 405841 4ff0b140243a419443ff288a486a54834ed26d93
parent 139679 f55906cadf07a9ef44cc4ce2574fe35f3dc85672
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1430927 - Require Rust 1.24. r=froydnj Require the current stable Rust release so new features can be used in development. MozReview-Commit-ID: 4NQNk3RfBkF

/* -*- 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 */