From 770178724f9493e99c832863031aef016f143e9f Mon Sep 17 00:00:00 2001 From: Martin Sustrik Date: Thu, 10 Dec 2009 21:34:40 +0100 Subject: errors are never predicted in branch prediction (likely/unlikely macros added) --- src/likely.hpp | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 src/likely.hpp (limited to 'src/likely.hpp') diff --git a/src/likely.hpp b/src/likely.hpp new file mode 100644 index 0000000..3ca7bd6 --- /dev/null +++ b/src/likely.hpp @@ -0,0 +1,32 @@ +/* + Copyright (c) 2007-2009 FastMQ Inc. + + This file is part of 0MQ. + + 0MQ is free software; you can redistribute it and/or modify it under + the terms of the Lesser GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + 0MQ is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + Lesser GNU General Public License for more details. + + You should have received a copy of the Lesser GNU General Public License + along with this program. If not, see . +*/ + +#ifndef __ZMQ_LIKELY_HPP_INCLUDED__ +#define __ZMQ_LIKELY_HPP_INCLUDED__ + +#if defined __GNUC__ +#define likely(x) __builtin_expect ((x), 1) +#define unlikely(x) __builtin_expect ((x), 0) +#else +#define likely(x) (x) +#define unlikely(x) (x) +#endif + + +#endif -- cgit v1.2.3