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random.h
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random.h
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/*
Copyright(c) 2010-2017 Intel Corporation.
Copyright(c) 2016-2018 Viosoft Corporation.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
This pseudorandom number generator is based on ref_xorshift128plus,
as implemented by reference_xorshift.h, which has been obtained
from https://sourceforge.net/projects/xorshift-cpp/
The licensing terms for reference_xorshift.h are reproduced below.
// Written in 2014 by Ivo Doko (ivo.doko@gmail.com)
// based on code written by Sebastiano Vigna (vigna@acm.org)
// To the extent possible under law, the author has dedicated
// all copyright and related and neighboring rights to this
// software to the public domain worldwide. This software is
// distributed without any warranty.
// See <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#ifndef _RANDOM_H_
#define _RANDOM_H_
#include <rte_cycles.h>
struct random {
uint64_t state[2];
};
static void random_init_seed(struct random *random)
{
random->state[0] = rte_rdtsc();
random->state[1] = rte_rdtsc();
}
static uint64_t random_next(struct random *random)
{
const uint64_t s0 = random->state[1];
const uint64_t s1 = random->state[0] ^ (random->state[0] << 23);
random->state[0] = random->state[1];
random->state[1] = (s1 ^ (s1 >> 18) ^ s0 ^ (s0 >> 5)) + s0;
return random->state[1];
}
#endif /* _RANDOM_H_ */