FreeBSD/Linux Kernel Cross Reference
sys/contrib/dpdk_rte_lpm/rte_branch_prediction.h

     /* SPDX-License-Identifier: BSD-3-Clause
      * Copyright(c) 2010-2014 Intel Corporation
      */
     
     /**
      * @file
      * Branch Prediction Helpers in RTE
      */
     
    #ifndef _RTE_BRANCH_PREDICTION_H_
    #define _RTE_BRANCH_PREDICTION_H_
    
    /**
     * Check if a branch is likely to be taken.
     *
     * This compiler builtin allows the developer to indicate if a branch is
     * likely to be taken. Example:
     *
     *   if (likely(x > 1))
     *      do_stuff();
     *
     */
    #ifndef likely
    #define likely(x)       __builtin_expect(!!(x), 1)
    #endif /* likely */
    
    /**
     * Check if a branch is unlikely to be taken.
     *
     * This compiler builtin allows the developer to indicate if a branch is
     * unlikely to be taken. Example:
     *
     *   if (unlikely(x < 1))
     *      do_stuff();
     *
     */
    #ifndef unlikely
    #define unlikely(x)     __builtin_expect(!!(x), 0)
    #endif /* unlikely */
    
    #endif /* _RTE_BRANCH_PREDICTION_H_ */

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