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27494a2 @jdelong Pull from FB rev 63ce89e2f2301e6bba44a111cc7d4218022156f6
jdelong authored
1 /*
2 * Copyright 2012 Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /**
18 * Compiler hints to indicate the fast path of an "if" branch: whether
19 * the if condition is likely to be true or false.
20 *
21 * @author Tudor Bosman (tudorb@fb.com)
22 */
23
24 #ifndef FOLLY_BASE_LIKELY_H_
25 #define FOLLY_BASE_LIKELY_H_
26
27 #undef LIKELY
28 #undef UNLIKELY
29
30 #if defined(__GNUC__) && __GNUC__ >= 4
31 #define LIKELY(x) (__builtin_expect((x), 1))
32 #define UNLIKELY(x) (__builtin_expect((x), 0))
33 #else
34 #define LIKELY(x) (x)
35 #define UNLIKELY(x) (x)
36 #endif
37
38 #endif /* FOLLY_BASE_LIKELY_H_ */
39
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