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29 lines
717 B
29 lines
717 B
4 months ago
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/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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*/
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/**
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* Compiler hints to indicate the fast path of an "if" branch: whether
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* the if condition is likely to be true or false.
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*
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* @author Tudor Bosman (tudorb@fb.com)
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*/
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#pragma once
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#undef LIKELY
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#undef UNLIKELY
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#if defined(__GNUC__) && __GNUC__ >= 4
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#define LIKELY(x) (__builtin_expect((x), 1))
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#define UNLIKELY(x) (__builtin_expect((x), 0))
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#else
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#define LIKELY(x) (x)
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#define UNLIKELY(x) (x)
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#endif
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