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/* Copyright (c) 2013, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/**
* @file
*
* ODP compiler hints
*/
#ifndef ODP_HINTS_H_
#define ODP_HINTS_H_
#ifdef __cplusplus
extern "C" {
#endif
/** @addtogroup odp_compiler_optim
* Macros that will give hints to the compiler.
* @{
*/
#ifdef __GNUC__
/** Define a weak symbol
* This is primarily useful in defining library functions that can be
* overridden in user code.
*/
#define ODP_WEAK_SYMBOL __attribute__((__weak__))
/**
* Hot code section
*/
#define ODP_HOT_CODE __attribute__((__hot__))
/**
* Cold code section
*/
#define ODP_COLD_CODE __attribute__((__cold__))
/**
* Branch likely taken
*/
#define odp_likely(x) __builtin_expect((x), 1)
/**
* Branch unlikely taken
*/
#define odp_unlikely(x) __builtin_expect((x), 0)
/*
* __builtin_prefetch (const void *addr, rw, locality)
*
* rw 0..1 (0: read, 1: write)
* locality 0..3 (0: dont leave to cache, 3: leave on all cache levels)
*/
/**
* Cache prefetch address
*/
#define odp_prefetch(x) __builtin_prefetch((x), 0, 3)
/**
* Cache prefetch address for storing
*/
#define odp_prefetch_store(x) __builtin_prefetch((x), 1, 3)
#else
#define ODP_WEAK_SYMBOL
#define ODP_HOT_CODE
#define ODP_COLD_CODE
#define odp_likely(x)
#define odp_unlikely(x)
#define odp_prefetch(x)
#define odp_prefetch_store(x)
#endif
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif
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