[RNG-82] XorShift1024StarPhi generator

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Implemented
• Affects Version/s: 1.3
• Fix Version/s: 1.3
• Component/s: core, simple
• Assignee: Alex Herbert
• Reporter: Alex Herbert
• Created: 06/Mar/19 21:21
• Updated: 11/Nov/19 14:26
• Resolved: 09/Apr/19 15:38

Description

The authors of the algorithm implemented in org.apache.commons.rng.core.source64.XorShift1024Star have produced a new variant using a different multiplier. The source code is described here:

xorshift1024star.c

For clarity the code states:

   NOTE: as of 2017-10-08, this generator has a different multiplier (a
   fixed-point representation of the golden ratio), which eliminates
   linear dependencies from one of the lowest bits. The previous
   multiplier was 1181783497276652981 (M_8 in the paper). If you need to
   tell apart the two generators, you can refer to this generator as
   xorshift1024φ and to the previous one as xorshift1024*M_8.

This can be added as a variant of the current implementation:

class = XorShift1024StarPhi
RandomSource = XOR_SHIFT_1024_S_PHI

Issue Links

• links to: GitHub Pull Request #30