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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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mfbt/Likely.h Normal file
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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 */