~~~{{ 'JUMP d:create #2271477771 , #4114797267 , #1872770499 , #2012404571 , 'k var 't var 's0 var 's1 var 's2 var 's3 var :reseed (n-) dup !s1 dup !s2 dup !s3 dup !k !t ; :rotl (x-) !k [ @k n:negate shift ] [ #32 @k - shift ] bi or ; :res** (-n) @s0 #5 * #7 rotl #9 * ; :next (-) @s1 dup #-9 shift push @s3 @s0 @s2 \pudupoxo \pupu.... \pudupoxo \swposwpo \dupuxopu \pudupoxo \popopoxo !s2 !s1 !s0 #11 rotl !s3 ; :xor-er (nananana-nananana) \dupufexo \pu...... \dupufexo \pu...... \dupufexo \pu...... \dupufexo \pu...... \popopopo \popopopo ; :jump? (nm-) [ JUMP + fetch ] dip #1 swap n:negate shift and ; :inner (n-n) #32 [ dup I jump? [ [ xor-er ] dip ] if next ] indexed-times ; ---reveal--- :random:xoroshiro128** (-n) next res** ; :random:xoroshiro128**:jump (-) #0 &s3 #0 &s2 #0 &s1 #0 &s0 #4 [ I inner drop ] indexed-times \stststst ; :random:xoroshiro128**:set-seed (n-) reseed #100 [ next ] times ; :random:xoroshiro128**:test-seed (nnnn-) !s0 !s1 !s2 !s3 ; }} ~~~

This is adapted from Samuel A. Falvo II's implementation. The original commentary follows:

I am aware of Wil Baden's sources, but I had difficulty getting it to compile under SwiftForth out of the box.

seeded ( uSeed -- ) Seeds the random number generator with the provided 32-bit, unsigned value.

probability ( -- u ) Returns a random value that falls in the range [0, $FFFFFFFF].

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

* Neither the name of Samuel A. Falvo II, Falvo Technical Solutions, nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

In adapting this, some concessions were made since RETRO only has signed 32-bit values.

random:mersenne:set-seed (n-) Seeds the random number generator with the provided 32-bit, unsigned value.

random:mersenne (-n) Returns a random value that falls in the range [0, n:MAX].

~~~{{ 'States d:create #625 allot 'Index var :reset (n-) &States over n:dec + dup fetch #30 shift swap fetch xor #1812433253 * over + n:MAX and swap &States + store ; :randomized (-) #1 [ dup reset n:inc dup #624 gt? ] until drop ; :y (n-y) dup n:inc #624 mod &States + fetch n:MAX and swap &States + fetch #-31 shift + ; :altered (n-) dup y dup #1 and #1073741823 * [ #2 / over #397 + #624 mod &States + fetch xor ] dip xor swap &States + store ; :scrambled (-) #0 [ dup altered n:inc dup #624 gt? ] until drop ; ---reveal--- :random:mersenne:set-seed (n-) !States #0 !Index randomized ; :random:mersenne (-n) @Index n:zero? &scrambled if @Index &States + fetch dup #11 shift xor dup #-7 shift #1073741823 and xor dup #-15 shift #2011365376 and xor dup #18 shift xor @Index n:inc #624 mod !Index ; }} ~~~