StormDrop64 provides enhanced parallelism, period, speed and statistical test results as an ideal alternative to 64-bit Mersenne Twister, 64-bit SFMT, Xoroshiro1024*, Xoroshiro1024**, Xoroshiro1024++, Xorshift1024*, Xorshift1024+, Xoshiro512**, Xoshiro512+ and Xoshiro512++.

It has a period of at least 2³²⁷⁶⁸.

Each state integer must be assigned a seed. Seeding a with non-overlapping integers and seeding the remaining state with overlapping integers behaves as a jump function with up to 2⁶⁴ parallel instances that each have a non-overlapping period of at least 2⁶⁴. The first several results from each parallel instance should be skipped.

The period is adjustable by changing the count of elements and the default & 511 masks as demonstrated in the following table. Statistical test results vary as the count of elements decreases from the default.

Elements   2ⁿ Period   & n
n Count    Minimum

4          256         3
8          512         7
16         1024        15
32         2048        31
64         4096        63
128        8192        127
256        16384       255
512        32768       511

stormDrop64 generates and returns a pseudorandom uint64_t integer, provided the implementation supports a 64-bit, unsigned integral type for uint64_t.

StormDrop32 provides enhanced parallelism, period, speed and statistical test results as an ideal alternative to 32-bit Mersenne Twister, 32-bit SFMT, WELL and Xorwow.

It has a period of at least 2³²⁷⁶⁸.

Each state integer must be assigned a seed. Seeding a with non-overlapping integers and seeding the remaining state with overlapping integers behaves as a jump function with up to 2³² parallel instances that each have a non-overlapping period of at least 2³². The first several results from each parallel instance should be skipped.

The period is adjustable by changing the count of elements and the default & 1023 masks as demonstrated in the following table. Statistical test results vary as the count of elements changes from the default.

Elements   2ⁿ Period   & n
n Count    Minimum

4          128         3
8          256         7
16         512         15
32         1024        31
64         2048        63
128        4096        127
256        8192        255
512        16384       511
1024       32768       1023
2048       65536       2047

stormDrop32 generates and returns a pseudorandom uint32_t integer, provided the implementation supports a 32-bit, unsigned integral type for uint32_t.