gpmp::core::rndm Namespace Reference

Classes
class	LCG
	Linear Congruential Generator. More...

Functions
uint32_t	rotr32 (uint32_t x, unsigned r)
uint32_t	pcg32 (void)
void	pcg32_init (uint64_t seed)

Function Documentation

pcg32()

uint32_t gpmp::core::rndm::pcg32

(

void

)

Definition at line 138 of file random.cpp.

                                 {
    uint64_t x = __PCG_STATE;
    unsigned count = (unsigned)(x >> 59); // 59 = 64 - 5
 
    __PCG_STATE = x * __PCG_MULTPLR + __PCG_INCR;
    x ^= x >> 18;                              // 18 = (64 - 27)/2
    return rotr32((uint32_t)(x >> 27), count); // 27 = 32 - 5
}

References __PCG_INCR, __PCG_MULTPLR, __PCG_STATE, and rotr32().

Referenced by pcg32_init().

pcg32_init()

void gpmp::core::rndm::pcg32_init

(

uint64_t

seed

)

Definition at line 147 of file random.cpp.

                                           {
    __PCG_STATE = seed + __PCG_INCR;
    (void)pcg32();
}

References __PCG_INCR, __PCG_STATE, and pcg32().

rotr32()

uint32_t gpmp::core::rndm::rotr32	(	uint32_t	x,
		unsigned	r
	)

Definition at line 134 of file random.cpp.

                                                    {
    return x >> r | x << (-r & 31);
}

Referenced by pcg32().