2012-10-19 08:44:41 +08:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2012-05-28 16:58:16 +08:00
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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2012-10-19 08:44:41 +08:00
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#ifndef mozilla_Likely_h_
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#define mozilla_Likely_h_
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2012-05-28 16:58:16 +08:00
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#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 2))
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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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2012-05-28 16:58:16 +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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2012-05-28 16:58:16 +08:00
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#endif
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2012-10-19 08:44:41 +08:00
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#endif /* mozilla_Likely_h_ */
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