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Update rprand.h

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Ray
2025-07-17 18:49:34 +02:00
parent 6b9a685bae
commit 8823aba9df
1 changed files with 21 additions and 21 deletions
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42
src/external/rprand.h vendored
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@ -15,15 +15,15 @@
* - Support 64 bits generation * - Support 64 bits generation
* *
* ADDITIONAL NOTES: * ADDITIONAL NOTES:
* This library implements two pseudo-random number generation algorithms: * This library implements two pseudo-random number generation algorithms:
* *
* - Xoshiro128** : https://prng.di.unimi.it/xoshiro128starstar.c * - Xoshiro128** : https://prng.di.unimi.it/xoshiro128starstar.c
* - SplitMix64 : https://prng.di.unimi.it/splitmix64.c * - SplitMix64 : https://prng.di.unimi.it/splitmix64.c
* *
* SplitMix64 is used to initialize the Xoshiro128** state, from a provided seed * SplitMix64 is used to initialize the Xoshiro128** state, from a provided seed
* *
* It's suggested to use SplitMix64 to initialize the state of the generators starting from * It's suggested to use SplitMix64 to initialize the state of the generators starting from
* a 64-bit seed, as research has shown that initialization must be performed with a generator * a 64-bit seed, as research has shown that initialization must be performed with a generator
* radically different in nature from the one initialized to avoid correlation on similar seeds. * radically different in nature from the one initialized to avoid correlation on similar seeds.
* *
* CONFIGURATION: * CONFIGURATION:
@ -31,7 +31,7 @@
* Generates the implementation of the library into the included file. * Generates the implementation of the library into the included file.
* If not defined, the library is in header only mode and can be included in other headers * If not defined, the library is in header only mode and can be included in other headers
* or source files without problems. But only ONE file should hold the implementation. * or source files without problems. But only ONE file should hold the implementation.
* *
* DEPENDENCIES: none * DEPENDENCIES: none
* *
* VERSIONS HISTORY: * VERSIONS HISTORY:
@ -153,7 +153,7 @@ static uint32_t rprand_state[4] = { // Xoshiro128** state, initializ
0x218b21e5, 0x218b21e5,
0xaa91febd, 0xaa91febd,
0x976414d4 0x976414d4
}; };
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
// Module internal functions declaration // Module internal functions declaration
@ -190,8 +190,8 @@ int rprand_get_value(int min, int max)
int *rprand_load_sequence(unsigned int count, int min, int max) int *rprand_load_sequence(unsigned int count, int min, int max)
{ {
int *sequence = NULL; int *sequence = NULL;
if (count > (unsigned int)(abs(max - min) + 1)) if (count > (unsigned int)(abs(max - min) + 1))
{ {
RPRAND_LOG("WARNING: Sequence count required is greater than range provided\n"); RPRAND_LOG("WARNING: Sequence count required is greater than range provided\n");
//count = (max - min); //count = (max - min);
@ -244,26 +244,26 @@ static inline uint32_t rprand_rotate_left(const uint32_t x, int k)
} }
// Xoshiro128** generator info: // Xoshiro128** generator info:
// //
// Written in 2018 by David Blackman and Sebastiano Vigna (vigna@acm.org) // Written in 2018 by David Blackman and Sebastiano Vigna (vigna@acm.org)
// //
// To the extent possible under law, the author has dedicated all copyright // To the extent possible under law, the author has dedicated all copyright
// and related and neighboring rights to this software to the public domain // and related and neighboring rights to this software to the public domain
// worldwide. This software is distributed without any warranty. // worldwide. This software is distributed without any warranty.
// //
// See <http://creativecommons.org/publicdomain/zero/1.0/>. // See <http://creativecommons.org/publicdomain/zero/1.0/>.
// //
// This is xoshiro128** 1.1, one of our 32-bit all-purpose, rock-solid // This is xoshiro128** 1.1, one of our 32-bit all-purpose, rock-solid
// generators. It has excellent speed, a state size (128 bits) that is // generators. It has excellent speed, a state size (128 bits) that is
// large enough for mild parallelism, and it passes all tests we are aware // large enough for mild parallelism, and it passes all tests we are aware
// of. // of.
// //
// Note that version 1.0 had mistakenly s[0] instead of s[1] as state // Note that version 1.0 had mistakenly s[0] instead of s[1] as state
// word passed to the scrambler. // word passed to the scrambler.
// //
// For generating just single-precision (i.e., 32-bit) floating-point // For generating just single-precision (i.e., 32-bit) floating-point
// numbers, xoshiro128+ is even faster. // numbers, xoshiro128+ is even faster.
// //
// The state must be seeded so that it is not everywhere zero. // The state must be seeded so that it is not everywhere zero.
// //
uint32_t rprand_xoshiro(void) uint32_t rprand_xoshiro(void)
@ -275,29 +275,29 @@ uint32_t rprand_xoshiro(void)
rprand_state[3] ^= rprand_state[1]; rprand_state[3] ^= rprand_state[1];
rprand_state[1] ^= rprand_state[2]; rprand_state[1] ^= rprand_state[2];
rprand_state[0] ^= rprand_state[3]; rprand_state[0] ^= rprand_state[3];
rprand_state[2] ^= t; rprand_state[2] ^= t;
rprand_state[3] = rprand_rotate_left(rprand_state[3], 11); rprand_state[3] = rprand_rotate_left(rprand_state[3], 11);
return result; return result;
} }
// SplitMix64 generator info: // SplitMix64 generator info:
// //
// Written in 2015 by Sebastiano Vigna (vigna@acm.org) // Written in 2015 by Sebastiano Vigna (vigna@acm.org)
// //
// To the extent possible under law, the author has dedicated all copyright // To the extent possible under law, the author has dedicated all copyright
// and related and neighboring rights to this software to the public domain // and related and neighboring rights to this software to the public domain
// worldwide. This software is distributed without any warranty. // worldwide. This software is distributed without any warranty.
// //
// See <http://creativecommons.org/publicdomain/zero/1.0/>. // See <http://creativecommons.org/publicdomain/zero/1.0/>.
// //
// //
// This is a fixed-increment version of Java 8's SplittableRandom generator // This is a fixed-increment version of Java 8's SplittableRandom generator
// See http://dx.doi.org/10.1145/2714064.2660195 and // See http://dx.doi.org/10.1145/2714064.2660195 and
// http://docs.oracle.com/javase/8/docs/api/java/util/SplittableRandom.html // http://docs.oracle.com/javase/8/docs/api/java/util/SplittableRandom.html
// //
// It is a very fast generator passing BigCrush, and it can be useful if // It is a very fast generator passing BigCrush, and it can be useful if
// for some reason you absolutely want 64 bits of state. // for some reason you absolutely want 64 bits of state.
uint64_t rprand_splitmix64() uint64_t rprand_splitmix64()