mirror of https://github.com/facebook/rocksdb.git
22 lines
780 B
C
22 lines
780 B
C
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef PORT_LIKELY_H_
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#define PORT_LIKELY_H_
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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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#endif // PORT_LIKELY_H_
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