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Update copyright notes in rkiss.h

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New info after a thread on talkchess:

http://www.talkchess.com/forum/viewtopic.php?t=38313

and some emails exchange with Heinz.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-03-09 09:20:43 +01:00
parent d85cf6d9c3
commit c2511243b4
1 changed files with 7 additions and 8 deletions
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15
src/rkiss.h
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@ -21,7 +21,9 @@
the Free Software Foundation, either version 3 of the License, or the Free Software Foundation, either version 3 of the License, or
(at your option) any later version. (at your option) any later version.
** A small "keep it simple and stupid" RNG with some fancy merits: ** 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 ** Quite platform independent
** Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-) ** Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-)
@ -31,9 +33,6 @@
** 64 bit seed ** 64 bit seed
** Return doubles with a full 53 bit mantissa ** Return doubles with a full 53 bit mantissa
** Thread safe ** Thread safe
**
** (c) Heinz van Saanen
*/ */
#if !defined(RKISS_H_INCLUDED) #if !defined(RKISS_H_INCLUDED)
@ -46,7 +45,7 @@ class RKISS {
// Keep variables always together // Keep variables always together
struct S { uint64_t a, b, c, d; } s; struct S { uint64_t a, b, c, d; } s;
uint64_t rot(uint64_t x, uint64_t k) const { uint64_t rotate(uint64_t x, uint64_t k) const {
return (x << k) | (x >> (64 - k)); return (x << k) | (x >> (64 - k));
} }
@ -54,9 +53,9 @@ class RKISS {
uint64_t rand64() { uint64_t rand64() {
const uint64_t const uint64_t
e = s.a - rot(s.b, 7); e = s.a - rotate(s.b, 7);
s.a = s.b ^ rot(s.c, 13); s.a = s.b ^ rotate(s.c, 13);
s.b = s.c + rot(s.d, 37); s.b = s.c + rotate(s.d, 37);
s.c = s.d + e; s.c = s.d + e;
return s.d = e + s.a; return s.d = e + s.a;
} }