1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/Likely.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,23 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/*
1.11 + * MOZ_LIKELY and MOZ_UNLIKELY macros to hint to the compiler how a
1.12 + * boolean predicate should be branch-predicted.
1.13 + */
1.14 +
1.15 +#ifndef mozilla_Likely_h
1.16 +#define mozilla_Likely_h
1.17 +
1.18 +#if defined(__clang__) || defined(__GNUC__)
1.19 +# define MOZ_LIKELY(x) (__builtin_expect(!!(x), 1))
1.20 +# define MOZ_UNLIKELY(x) (__builtin_expect(!!(x), 0))
1.21 +#else
1.22 +# define MOZ_LIKELY(x) (!!(x))
1.23 +# define MOZ_UNLIKELY(x) (!!(x))
1.24 +#endif
1.25 +
1.26 +#endif /* mozilla_Likely_h */
