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Update rprand.h
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42
src/external/rprand.h
vendored
42
src/external/rprand.h
vendored
@@ -15,15 +15,15 @@
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* - Support 64 bits generation
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*
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* ADDITIONAL NOTES:
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* This library implements two pseudo-random number generation algorithms:
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* This library implements two pseudo-random number generation algorithms:
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*
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* - Xoshiro128** : https://prng.di.unimi.it/xoshiro128starstar.c
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* - SplitMix64 : https://prng.di.unimi.it/splitmix64.c
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*
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* SplitMix64 is used to initialize the Xoshiro128** state, from a provided seed
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*
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* It's suggested to use SplitMix64 to initialize the state of the generators starting from
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* a 64-bit seed, as research has shown that initialization must be performed with a generator
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* It's suggested to use SplitMix64 to initialize the state of the generators starting from
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* a 64-bit seed, as research has shown that initialization must be performed with a generator
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* radically different in nature from the one initialized to avoid correlation on similar seeds.
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*
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* CONFIGURATION:
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@@ -31,7 +31,7 @@
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* Generates the implementation of the library into the included file.
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* If not defined, the library is in header only mode and can be included in other headers
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* or source files without problems. But only ONE file should hold the implementation.
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*
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*
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* DEPENDENCIES: none
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*
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* VERSIONS HISTORY:
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@@ -153,7 +153,7 @@ static uint32_t rprand_state[4] = { // Xoshiro128** state, initializ
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0x218b21e5,
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0xaa91febd,
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0x976414d4
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};
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};
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//----------------------------------------------------------------------------------
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// Module internal functions declaration
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@@ -190,8 +190,8 @@ int rprand_get_value(int min, int max)
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int *rprand_load_sequence(unsigned int count, int min, int max)
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{
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int *sequence = NULL;
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if (count > (unsigned int)(abs(max - min) + 1))
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if (count > (unsigned int)(abs(max - min) + 1))
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{
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RPRAND_LOG("WARNING: Sequence count required is greater than range provided\n");
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//count = (max - min);
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@@ -244,26 +244,26 @@ static inline uint32_t rprand_rotate_left(const uint32_t x, int k)
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}
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// Xoshiro128** generator info:
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//
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//
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// Written in 2018 by David Blackman and Sebastiano Vigna (vigna@acm.org)
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//
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//
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// To the extent possible under law, the author has dedicated all copyright
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// and related and neighboring rights to this software to the public domain
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// worldwide. This software is distributed without any warranty.
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//
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//
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// See <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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//
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// This is xoshiro128** 1.1, one of our 32-bit all-purpose, rock-solid
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// generators. It has excellent speed, a state size (128 bits) that is
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// large enough for mild parallelism, and it passes all tests we are aware
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// of.
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//
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//
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// Note that version 1.0 had mistakenly s[0] instead of s[1] as state
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// word passed to the scrambler.
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//
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//
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// For generating just single-precision (i.e., 32-bit) floating-point
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// numbers, xoshiro128+ is even faster.
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//
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//
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// The state must be seeded so that it is not everywhere zero.
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//
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uint32_t rprand_xoshiro(void)
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@@ -275,29 +275,29 @@ uint32_t rprand_xoshiro(void)
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rprand_state[3] ^= rprand_state[1];
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rprand_state[1] ^= rprand_state[2];
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rprand_state[0] ^= rprand_state[3];
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rprand_state[2] ^= t;
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rprand_state[3] = rprand_rotate_left(rprand_state[3], 11);
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return result;
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}
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// SplitMix64 generator info:
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//
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//
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// Written in 2015 by Sebastiano Vigna (vigna@acm.org)
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//
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//
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// To the extent possible under law, the author has dedicated all copyright
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// and related and neighboring rights to this software to the public domain
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// worldwide. This software is distributed without any warranty.
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//
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//
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// See <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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//
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//
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// This is a fixed-increment version of Java 8's SplittableRandom generator
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// See http://dx.doi.org/10.1145/2714064.2660195 and
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// http://docs.oracle.com/javase/8/docs/api/java/util/SplittableRandom.html
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//
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//
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// It is a very fast generator passing BigCrush, and it can be useful if
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// for some reason you absolutely want 64 bits of state.
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uint64_t rprand_splitmix64()
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