Alex Herbert created RNG-124:
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Summary: Create fixed increment PCG generators
Key: RNG-124
URL: https://issues.apache.org/jira/browse/RNG-124
Project: Commons RNG
Issue Type: Improvement
Components: core, simple
Affects Versions: 1.3
Reporter: Alex Herbert
Assignee: Alex Herbert
The increment of the PCG generator serves to select the underlying linear
congruential generator (LCG) from 2 classes of related generators. Thus
initialisation of generators using different increments can result in PCG
output with massive correlations. The result is that seeding with 128-bits does
not reduce the chance of correlated output over seeding with just 64-bits and
using a fixed increment. See RNG-123.
Create a fixed increment version of the three PCG generators which currently
accept the increment in their seed:
{noformat}
PCG_XSH_RR_32 => PCG_XSH_RR_32_OS
PCG_XSH_RS_32 => PCG_XSH_RS_32_OS
PCG_RXS_M_XS_64 => PCG_RXS_M_XS_64_OS
{noformat}
Here the {{_OS}} suffix represents One Sequence. The equivalent PCG generators
in the reference c++ source code have a _oneseq suffix.
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