X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Frkiss.h;h=d017849568ac67aa70495f1d14dbf558c042da8f;hp=5c01a0e56403da996e95a2997080698d2d3d764c;hb=976270916bbfb9c4aa1f2b8ee2897b582a238e25;hpb=c2511243b40964e5ed5f35447baf5663a72da72a diff --git a/src/rkiss.h b/src/rkiss.h index 5c01a0e5..d0178495 100644 --- a/src/rkiss.h +++ b/src/rkiss.h @@ -20,19 +20,6 @@ available under the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. - - ** George Marsaglia invented the RNG-Kiss-family in the early 90's. - ** This is a specific version that Heinz van Saanen derived and - ** tested from some public domain code by Bob Jenkins: - ** - ** Quite platform independent - ** Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-) - ** ~12 times faster than my *nix sys-rand() - ** ~4 times faster than SSE2-version of Mersenne twister - ** Average cycle length: ~2^126 - ** 64 bit seed - ** Return doubles with a full 53 bit mantissa - ** Thread safe */ #if !defined(RKISS_H_INCLUDED) @@ -40,6 +27,20 @@ #include "types.h" +/// RKISS is our pseudo random number generator (PRNG) used to compute hash keys. +/// George Marsaglia invented the RNG-Kiss-family in the early 90's. This is a +/// specific version that Heinz van Saanen derived from some public domain code +/// by Bob Jenkins. Following the feature list, as tested by Heinz. +/// +/// - Quite platform independent +/// - Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-) +/// - ~12 times faster than my *nix sys-rand() +/// - ~4 times faster than SSE2-version of Mersenne twister +/// - Average cycle length: ~2^126 +/// - 64 bit seed +/// - Return doubles with a full 53 bit mantissa +/// - Thread safe + class RKISS { // Keep variables always together