Likely.h (765B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /* 8 * MOZ_LIKELY and MOZ_UNLIKELY macros to hint to the compiler how a 9 * boolean predicate should be branch-predicted. 10 */ 11 12 #ifndef mozilla_Likely_h 13 #define mozilla_Likely_h 14 15 #if defined(__clang__) || defined(__GNUC__) 16 # define MOZ_LIKELY(x) (__builtin_expect(!!(x), 1)) 17 # define MOZ_UNLIKELY(x) (__builtin_expect(!!(x), 0)) 18 #else 19 # define MOZ_LIKELY(x) (!!(x)) 20 # define MOZ_UNLIKELY(x) (!!(x)) 21 #endif 22 23 #endif /* mozilla_Likely_h */