mfbt/Likely.h@7e26c7da4463 (annotated)
mfbt/Likely.h
Wed, 31 Dec 2014 06:55:50 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:55:50 +0100
- changeset 2
- 7e26c7da4463
- permissions
- -rw-r--r--
Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | /* |
| michael@0 | 8 | * MOZ_LIKELY and MOZ_UNLIKELY macros to hint to the compiler how a |
| michael@0 | 9 | * boolean predicate should be branch-predicted. |
| michael@0 | 10 | */ |
| michael@0 | 11 | |
| michael@0 | 12 | #ifndef mozilla_Likely_h |
| michael@0 | 13 | #define mozilla_Likely_h |
| michael@0 | 14 | |
| michael@0 | 15 | #if defined(__clang__) || defined(__GNUC__) |
| michael@0 | 16 | # define MOZ_LIKELY(x) (__builtin_expect(!!(x), 1)) |
| michael@0 | 17 | # define MOZ_UNLIKELY(x) (__builtin_expect(!!(x), 0)) |
| michael@0 | 18 | #else |
| michael@0 | 19 | # define MOZ_LIKELY(x) (!!(x)) |
| michael@0 | 20 | # define MOZ_UNLIKELY(x) (!!(x)) |
| michael@0 | 21 | #endif |
| michael@0 | 22 | |
| michael@0 | 23 | #endif /* mozilla_Likely_h */ |
