Use 'pcg64_fast' for RNG
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This is a higher quality source of randomness than a XOR-shift
generator, while still being fast and easy to write.
This commit is contained in:
Bruno BELANYI 2024-04-06 19:30:53 +01:00
parent 7dd0da6628
commit 93d255623b
2 changed files with 144 additions and 140 deletions

View file

@ -60,138 +60,138 @@ impl MagicMoves {
// region:sourcegen
/// A set of magic numbers for bishop move generation.
pub(crate) const BISHOP_SEED: [u64; Square::NUM_VARIANTS] = [
4908958787341189172,
1157496606860279808,
289395876198088778,
649648646467355137,
19162426089930848,
564067194896448,
18586170375029026,
9185354800693760,
72172012436987968,
317226351607872,
2597178509285688384,
1162205282238464,
144154788211329152,
172197832046936160,
4625762105940000802,
1477217245166903296,
2251937789583872,
289373902621379585,
4616200855845409024,
2251909637357568,
3532510975437640064,
563517968228352,
562953309660434,
1196005458310201856,
2350914225914520576,
2287018679861376,
13836188353273790593,
11267795163676832,
297519119119499264,
18588344158519552,
10453428171813953792,
72128237668534272,
1298164929055953920,
865575144395900952,
9293076573325312,
108104018148197376,
578503662094123152,
4665870505495102224,
6066493872259301520,
285877477613857,
2328941618281318466,
721165292771739652,
4899973577790523400,
75050392749184,
2305878200632215680,
11530099074925593616,
290561512873919880,
18652187227888000,
3379933716168704,
9223409493537718272,
22273835729926,
1152921524003672064,
4647812741240848385,
1244225087719112712,
7367907171013001728,
9263922034316951570,
300758214358598160,
4611686331973636096,
2377900605806479360,
6958097192913601024,
864691130877743617,
703824948904066,
612700674899317536,
180742128018784384,
4634226011293351952,
6918109887683821586,
76562328660738184,
7242919606867744800,
13871652069997347969,
1171657252671901696,
147001475087730752,
1752045392763101248,
288406435526639744,
4612213818402029888,
9808848818951710728,
9223394181731320840,
54047645651435648,
9224780030482579712,
9049059098626048,
1442330840700035221,
1126037887157508,
1153488887004529665,
290485130928332936,
9226749771011592258,
148636405693678112,
2260596997758984,
73470481646424336,
2341907012146823680,
2314955761652335121,
2265544246165632,
13598764778463296,
563087425962496,
563087425962048,
2163991853573081088,
567353402270020,
6488844433713538048,
288810987011448834,
11830884701569344,
2747549955031826688,
35734665298432,
18025943920672800,
292892945404789012,
1153520472160470528,
2260949167801860,
155446765112299521,
379008324189818944,
4616480181217005576,
576461027453960704,
2450556349601564416,
1160556519943569536,
4612900059821375552,
5477089643453251617,
9223532084785594632,
2810391870219355200,
36594222015453185,
4612011546951352320,
2392883590201344,
1152956706186200064,
9009415592510464,
81077999302148128,
576746627483043968,
301267327789056,
39586720976896,
720878306081243648,
9223512777841312257,
5764609859566698625,
8088544233436348496,
4612856276794474560,
];
/// A set of magic numbers for rook move generation.
pub(crate) const ROOK_SEED: [u64; Square::NUM_VARIANTS] = [
2341871943948451840,
18015635528220736,
72066665545773824,
1188959097794342912,
12141713393631625314,
720649693658353672,
36029896538981888,
36033359356363520,
140746619355268,
1158339898446446661,
36591886560003650,
578853633228023808,
2392554490300416,
140814806160384,
180706952366596608,
10696087878779396,
1153260703948210820,
310748649170673678,
36311372044308544,
9223444604757615104,
1267187285230592,
282574622818306,
18722484274726152,
2271591090110593,
1153063519847989248,
10168327557107712,
4507998211276833,
1153203035420233728,
4631961017139660032,
2454499182462107776,
289367288355753288,
18015815850820609,
9268726066908758912,
11547264697673728000,
2314929519368081536,
140943655192577,
20266215511427202,
180706969441535248,
1302683805944911874,
11534000122299940994,
22676602724843520,
4639271120198041668,
1302104069046927376,
9184220895313928,
4612249105954373649,
562984581726212,
2312678200579457040,
4647736876550193157,
3170604524138139776,
4684447574787096704,
20283792725901696,
1152992019380963840,
117383863558471808,
1153488854922068096,
17596884583424,
90074759127192064,
4900502436426416706,
4573968656793901,
1161084564408385,
1657887889314811910,
4614501455660058690,
4612530729109422081,
642458506527236,
1116704154754,
180144122814791812,
10448386594766422036,
9403533616331358856,
108095189301858304,
72076290316044288,
36066182562054145,
4647717564258980096,
13979173385364603396,
4620833992751489152,
297800804633419904,
578009002156298240,
2450099003505838082,
1175721046778052864,
20406952999780864,
1175861788231598592,
36169538802827392,
288371663414771712,
423313050501155,
604731668136450,
580261214513399808,
297661437206136832,
1750211954976489600,
9020393411186696,
9259543770406356001,
44532368556032,
10376381507760693256,
52778707714176,
4612829512676149248,
1882513444629184528,
2369460754144428160,
9223380850137104901,
2666413562481640036,
141012643087392,
16735517094631719424,
17594358702087,
2344264412262574084,
422813768878080,
1126450811896320,
54466576291772936,
42784758060548372,
292874851780165648,
18015364885839937,
282644818493504,
1184447393488764944,
4649966632473477184,
563499910594566,
17632049496086,
18502729728001,
140742121013504,
9711024139665536,
246293205270784,
290772515771392256,
9230131836490350720,
73326432604127360,
453174886517643776,
2396271245728563712,
324259242966026501,
288953994406543363,
1153557061259362338,
40533496293515441,
1407392197644307,
1729945211427624002,
587808330812164100,
9511606812128903298,
];
// endregion:sourcegen

View file

@ -3,21 +3,25 @@ pub trait RandGen {
fn gen(&mut self) -> u64;
}
// A simple XOR-shift RNG implementation, for code-generation.
// A simple pcg64_fast RNG implementation, for code-generation.
#[cfg(test)]
pub struct SimpleRng(u64);
pub struct SimpleRng(u128);
#[cfg(test)]
impl SimpleRng {
pub fn new() -> Self {
Self(4) // https://xkcd.com/221/
Self(0xcafef00dd15ea5e5 | 1) // https://xkcd.com/221/
}
pub fn gen(&mut self) -> u64 {
self.0 ^= self.0 >> 12;
self.0 ^= self.0 << 25;
self.0 ^= self.0 >> 27;
self.0
const MULTIPLIER: u128 = 0x2360_ED05_1FC6_5DA4_4385_DF64_9FCC_F645;
const XSHIFT: u32 = 64; // (128 - 64 + 64) / 2
const ROTATE: u32 = 122; // 128 - 6
self.0 = self.0.wrapping_mul(MULTIPLIER);
let rot = (self.0 >> ROTATE) as u32;
let xsl = (self.0 >> XSHIFT) as u64 ^ (self.0 as u64);
xsl.rotate_right(rot)
}
}
@ -36,10 +40,10 @@ mod test {
fn rng() {
let mut rng = SimpleRng::new();
assert_eq!(rng.gen(), 134217733);
assert_eq!(rng.gen(), 4504699139039237);
assert_eq!(rng.gen(), 13512173405898766);
assert_eq!(rng.gen(), 9225626310854853124);
assert_eq!(rng.gen(), 29836777971867270);
assert_eq!(rng.gen(), 64934999470316615);
assert_eq!(rng.gen(), 15459456780870779090);
assert_eq!(rng.gen(), 13715484424881807779);
assert_eq!(rng.gen(), 17718572936700675021);
assert_eq!(rng.gen(), 14587996314750246637);
}
}