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- /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* vim: set ts=8 sts=2 et sw=2 tw=80: */
- /* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
- /*
- * MOZ_LIKELY and MOZ_UNLIKELY macros to hint to the compiler how a
- * boolean predicate should be branch-predicted.
- */
- #ifndef mozilla_Likely_h
- #define mozilla_Likely_h
- #if defined(__clang__) || defined(__GNUC__)
- # define MOZ_LIKELY(x) (__builtin_expect(!!(x), 1))
- # define MOZ_UNLIKELY(x) (__builtin_expect(!!(x), 0))
- #else
- # define MOZ_LIKELY(x) (!!(x))
- # define MOZ_UNLIKELY(x) (!!(x))
- #endif
- #endif /* mozilla_Likely_h */
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