2013-10-30 21:55:19 +08:00
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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2012-08-28 02:41:49 +08:00
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/* This Source Code Form is subject to the terms of the Mozilla Public
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2013-10-30 21:55:19 +08:00
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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2012-08-28 02:41:49 +08:00
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/*
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* MOZ_LIKELY and MOZ_UNLIKELY macros to hint to the compiler how a
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* boolean predicate should be branch-predicted.
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*/
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2013-10-30 21:55:19 +08:00
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#ifndef mozilla_Likely_h
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#define mozilla_Likely_h
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2012-08-28 02:41:49 +08:00
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2013-04-10 11:19:43 +08:00
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#if defined(__clang__) || defined(__GNUC__)
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2013-01-09 13:42:21 +08:00
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# define MOZ_LIKELY(x) (__builtin_expect(!!(x), 1))
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# define MOZ_UNLIKELY(x) (__builtin_expect(!!(x), 0))
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2012-08-28 02:41:49 +08:00
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#else
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2013-01-09 13:42:21 +08:00
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# define MOZ_LIKELY(x) (!!(x))
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# define MOZ_UNLIKELY(x) (!!(x))
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2012-08-28 02:41:49 +08:00
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#endif
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2013-10-30 21:55:19 +08:00
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#endif /* mozilla_Likely_h */
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