gecko-dev/mfbt/Likely.h

22 lines
635 B
C

/* 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 Likely_h_
#define Likely_h_
#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 2))
# 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 /* Likely_h_ */