xoroshiro128p.h File Reference

#include <stdint.h>

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Functions
static uint64_t	rotl (const uint64_t x, const int k)
	rotating left shift helper According to the original authors, this will on most platforms reduce to a single instruction More...
static uint64_t	xoroshiro128p_next (uint64_t *state)
	generate the next random number and update the state. This is the workhorse, here! More...
static void	xoroshiro128p_jump (uint64_t *state)
	Advance the internal state by 2^64 steps; useful when coordinating multiple independent RNGs This is the jump function for the generator. It is equivalent to 2^64 calls to next(); it can be used to generate 2^64 non-overlapping subsequences for parallel computations. More...
static uint64_t	splitmix64_next (uint64_t *state)
	step of the SPLITMIX64 RNG; only used internally for seeding This RNG isn't as good as XOROSHIRO128+, so it's only used to initialize a 128 bit state from a seed. More...
static void	xoroshiro128p_seed (uint64_t *state, const uint64_t seed)
	Seed the 128 bit state from a 64 bit seed. More...

Function Documentation

rotl()

static uint64_t rotl ( const uint64_t  x, const int  k  )

inlinestatic

rotating left shift helper According to the original authors, this will on most platforms reduce to a single instruction

Referenced by xoroshiro128p_next().

splitmix64_next()

static uint64_t splitmix64_next ( uint64_t *  state )

inlinestatic

step of the SPLITMIX64 RNG; only used internally for seeding This RNG isn't as good as XOROSHIRO128+, so it's only used to initialize a 128 bit state from a seed.

Referenced by xoroshiro128p_seed().

xoroshiro128p_jump()

static void xoroshiro128p_jump ( uint64_t *  state )

inlinestatic

Advance the internal state by 2^64 steps; useful when coordinating multiple independent RNGs This is the jump function for the generator. It is equivalent to 2^64 calls to next(); it can be used to generate 2^64 non-overlapping subsequences for parallel computations.

References xoroshiro128p_next().

Referenced by xoroshiro128p_seed().

xoroshiro128p_next()

static uint64_t xoroshiro128p_next ( uint64_t *  state )

inlinestatic

generate the next random number and update the state. This is the workhorse, here!

References rotl().

Referenced by gr::xoroshiro128p_prng::operator()(), and xoroshiro128p_jump().

xoroshiro128p_seed()

static void xoroshiro128p_seed ( uint64_t *  state, const uint64_t  seed  )

inlinestatic

Seed the 128 bit state from a 64 bit seed.

References splitmix64_next(), and xoroshiro128p_jump().

Referenced by gr::xoroshiro128p_prng::seed().