[ceph.git] / ceph / src / spdk / dpdk / lib / librte_eal / common / include / 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_ */
Commit	Line	Data
11fdf7f2 TL	1	/* SPDX-License-Identifier: BSD-3-Clause
	2	* Copyright(c) 2010-2014 Intel Corporation
	3	*/
	4
	5	/**
	6	* @file
	7	* Branch Prediction Helpers in RTE
	8	*/
	9
	10	#ifndef _RTE_BRANCH_PREDICTION_H_
	11	#define _RTE_BRANCH_PREDICTION_H_
	12
	13	/**
	14	* Check if a branch is likely to be taken.
	15	*
	16	* This compiler builtin allows the developer to indicate if a branch is
	17	* likely to be taken. Example:
	18	*
	19	* if (likely(x > 1))
	20	* do_stuff();
	21	*
	22	*/
	23	#ifndef likely
	24	#define likely(x) __builtin_expect(!!(x), 1)
	25	#endif /* likely */
	26
	27	/**
	28	* Check if a branch is unlikely to be taken.
	29	*
	30	* This compiler builtin allows the developer to indicate if a branch is
	31	* unlikely to be taken. Example:
	32	*
	33	* if (unlikely(x < 1))
	34	* do_stuff();
	35	*
	36	*/
	37	#ifndef unlikely
	38	#define unlikely(x) __builtin_expect(!!(x), 0)
	39	#endif /* unlikely */
	40
	41	#endif /* _RTE_BRANCH_PREDICTION_H_ */