75 lines
2.3 KiB
Common Lisp
75 lines
2.3 KiB
Common Lisp
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/**
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@file
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Implements a 64-bit Permutated Congruential generator (PCG-XSH-RR).
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M. E. O’Neill, Pcg: A family of simple fast space-efficient statistically good algorithms for random number generation, ACM Transactions on Mathematical Software.
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FROM: https://github.com/bstatcomp/RandomCL/blob/master/generators/pcg6432.cl
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*/
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#define RNG32
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#define PCG6432_FLOAT_MULTI 2.3283064365386963e-10f
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#define PCG6432_DOUBLE2_MULTI 2.3283064365386963e-10
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#define PCG6432_DOUBLE_MULTI 5.4210108624275221700372640e-20
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/**
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State of pcg6432 RNG.
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*/
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typedef unsigned long pcg6432_state;
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#define PCG6432_XORSHIFTED(s) ((uint)((((s) >> 18u) ^ (s)) >> 27u))
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#define PCG6432_ROT(s) ((s) >> 59u)
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#define pcg6432_macro_uint(state) ( \
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state = state * 6364136223846793005UL + 0xda3e39cb94b95bdbUL, \
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(PCG6432_XORSHIFTED(state) >> PCG6432_ROT(state)) | (PCG6432_XORSHIFTED(state) << ((-PCG6432_ROT(state)) & 31)) \
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)
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/**
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Generates a random 32-bit unsigned integer using pcg6432 RNG.
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@param state State of the RNG to use.
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*/
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#define pcg6432_uint(state) _pcg6432_uint(&state)
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unsigned int _pcg6432_uint(pcg6432_state* state){
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ulong oldstate = *state;
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*state = oldstate * 6364136223846793005UL + 0xda3e39cb94b95bdbUL;
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uint xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
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uint rot = oldstate >> 59u;
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return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
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}
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/**
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Seeds pcg6432 RNG.
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@param state Variable, that holds state of the generator to be seeded.
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@param seed Value used for seeding. Should be randomly generated for each instance of generator (thread).
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*/
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void pcg6432_seed(pcg6432_state* state, unsigned long j){
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*state=j;
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}
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/**
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Generates a random 64-bit unsigned integer using pcg6432 RNG.
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@param state State of the RNG to use.
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*/
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#define pcg6432_ulong(state) ((((ulong)pcg6432_uint(state)) << 32) | pcg6432_uint(state))
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/**
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Generates a random float using pcg6432 RNG.
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@param state State of the RNG to use.
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*/
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#define pcg6432_float(state) (pcg6432_uint(state)*PCG6432_FLOAT_MULTI)
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/**
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Generates a random double using pcg6432 RNG.
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@param state State of the RNG to use.
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*/
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#define pcg6432_double(state) (pcg6432_ulong(state)*PCG6432_DOUBLE_MULTI)
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/**
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Generates a random double using pcg6432 RNG. Generated using only 32 random bits.
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@param state State of the RNG to use.
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*/
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#define pcg6432_double2(state) (pcg6432_uint(state)*PCG6432_DOUBLE2_MULTI)
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/*
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END OF SOURCED RANDOM GENERATOR
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*/
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