• Original source: http://xoroshiro.di.unimi.it/ (refer to Archive.org WayBack Machine for the chronological change of the contents, including those of http://xorshift.di.unimi.it/)

• Tag original-20150905 contains Xorshift64* and Xorshift4096* code, later removed by the author.
• Tag original-20160106 contains SplitMix64 code, and revised Xorshift128+ code.
• Tag original-20160913 contains Xoroshiro128+ code, and put old Xorshift64* and Xorshift4096* code back as for archive.
• Tag original-20170504 contains Xoroshiro116+ code, and includes revision of other codes changing 1ULL to UINT64_C(1) of C99.

Executive summary: the change was for a slight (measurable but non-critical) mathematical improvement. No need for immediate change from the 20150905 code.

See http://v8project.blogspot.co.uk/2015/12/theres-mathrandom-and-then-theres.html?showComment=1450389868643#c2004131565745698275 for the details.

Public Domain. See UNLICENSE.