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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:25:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:25:22 +0000
commitf6ad4dcef54c5ce997a4bad5a6d86de229015700 (patch)
tree7cfa4e31ace5c2bd95c72b154d15af494b2bcbef /src/math/rand/rng.go
parentInitial commit. (diff)
downloadgolang-1.22-f6ad4dcef54c5ce997a4bad5a6d86de229015700.tar.xz
golang-1.22-f6ad4dcef54c5ce997a4bad5a6d86de229015700.zip
Adding upstream version 1.22.1.upstream/1.22.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/math/rand/rng.go')
-rw-r--r--src/math/rand/rng.go252
1 files changed, 252 insertions, 0 deletions
diff --git a/src/math/rand/rng.go b/src/math/rand/rng.go
new file mode 100644
index 0000000..1e4a9e0
--- /dev/null
+++ b/src/math/rand/rng.go
@@ -0,0 +1,252 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package rand
+
+/*
+ * Uniform distribution
+ *
+ * algorithm by
+ * DP Mitchell and JA Reeds
+ */
+
+const (
+ rngLen = 607
+ rngTap = 273
+ rngMax = 1 << 63
+ rngMask = rngMax - 1
+ int32max = (1 << 31) - 1
+)
+
+var (
+ // rngCooked used for seeding. See gen_cooked.go for details.
+ rngCooked [rngLen]int64 = [...]int64{
+ -4181792142133755926, -4576982950128230565, 1395769623340756751, 5333664234075297259,
+ -6347679516498800754, 9033628115061424579, 7143218595135194537, 4812947590706362721,
+ 7937252194349799378, 5307299880338848416, 8209348851763925077, -7107630437535961764,
+ 4593015457530856296, 8140875735541888011, -5903942795589686782, -603556388664454774,
+ -7496297993371156308, 113108499721038619, 4569519971459345583, -4160538177779461077,
+ -6835753265595711384, -6507240692498089696, 6559392774825876886, 7650093201692370310,
+ 7684323884043752161, -8965504200858744418, -2629915517445760644, 271327514973697897,
+ -6433985589514657524, 1065192797246149621, 3344507881999356393, -4763574095074709175,
+ 7465081662728599889, 1014950805555097187, -4773931307508785033, -5742262670416273165,
+ 2418672789110888383, 5796562887576294778, 4484266064449540171, 3738982361971787048,
+ -4699774852342421385, 10530508058128498, -589538253572429690, -6598062107225984180,
+ 8660405965245884302, 10162832508971942, -2682657355892958417, 7031802312784620857,
+ 6240911277345944669, 831864355460801054, -1218937899312622917, 2116287251661052151,
+ 2202309800992166967, 9161020366945053561, 4069299552407763864, 4936383537992622449,
+ 457351505131524928, -8881176990926596454, -6375600354038175299, -7155351920868399290,
+ 4368649989588021065, 887231587095185257, -3659780529968199312, -2407146836602825512,
+ 5616972787034086048, -751562733459939242, 1686575021641186857, -5177887698780513806,
+ -4979215821652996885, -1375154703071198421, 5632136521049761902, -8390088894796940536,
+ -193645528485698615, -5979788902190688516, -4907000935050298721, -285522056888777828,
+ -2776431630044341707, 1679342092332374735, 6050638460742422078, -2229851317345194226,
+ -1582494184340482199, 5881353426285907985, 812786550756860885, 4541845584483343330,
+ -6497901820577766722, 4980675660146853729, -4012602956251539747, -329088717864244987,
+ -2896929232104691526, 1495812843684243920, -2153620458055647789, 7370257291860230865,
+ -2466442761497833547, 4706794511633873654, -1398851569026877145, 8549875090542453214,
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+ 6097729358393448602, -7491646050550022124, -5117116194870963097, -896216826133240300,
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+ -8381261370078904295, 572156825025677802, 1791881013492340891, 3393267094866038768,
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+ 5907508150730407386, -8438615781380831356, 972392927514829904, -3801314342046600696,
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+ 1147977171614181568, 5066037465548252321, 2574765911837859848, 1085848279845204775,
+ -5873264506986385449, 6116438694366558490, 2107701075971293812, -7420077970933506541,
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+ 3681878764086140361, 3289686137190109749, 6587997200611086848, 244714774258135476,
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+ -2971981702428546974, -7854441788951256975, 8809096399316380241, 6492004350391900708,
+ 2462145737463489636, -8818543617934476634, -5070345602623085213, -8961586321599299868,
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+ -3403028373052861600, -8838073512170985897, -3999237033416576341, -2920240395515973663,
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+ 4782583894627718279, 6718292300699989587, 8387085186914375220, 3387513132024756289,
+ 4654329375432538231, -292704475491394206, -3848998599978456535, 7623042350483453954,
+ 7725442901813263321, 9186225467561587250, -5132344747257272453, -6865740430362196008,
+ 2530936820058611833, 1636551876240043639, -3658707362519810009, 1452244145334316253,
+ -7161729655835084979, -7943791770359481772, 9108481583171221009, -3200093350120725999,
+ 5007630032676973346, 2153168792952589781, 6720334534964750538, -3181825545719981703,
+ 3433922409283786309, 2285479922797300912, 3110614940896576130, -2856812446131932915,
+ -3804580617188639299, 7163298419643543757, 4891138053923696990, 580618510277907015,
+ 1684034065251686769, 4429514767357295841, -8893025458299325803, -8103734041042601133,
+ 7177515271653460134, 4589042248470800257, -1530083407795771245, 143607045258444228,
+ 246994305896273627, -8356954712051676521, 6473547110565816071, 3092379936208876896,
+ 2058427839513754051, -4089587328327907870, 8785882556301281247, -3074039370013608197,
+ -637529855400303673, 6137678347805511274, -7152924852417805802, 5708223427705576541,
+ -3223714144396531304, 4358391411789012426, 325123008708389849, 6837621693887290924,
+ 4843721905315627004, -3212720814705499393, -3825019837890901156, 4602025990114250980,
+ 1044646352569048800, 9106614159853161675, -8394115921626182539, -4304087667751778808,
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+ -8744380348503999773, 8746140185685648781, 228500091334420247, 1356187007457302238,
+ 3019253992034194581, 3152601605678500003, -8793219284148773595, 5559581553696971176,
+ 4916432985369275664, -8559797105120221417, -5802598197927043732, 2868348622579915573,
+ -7224052902810357288, -5894682518218493085, 2587672709781371173, -7706116723325376475,
+ 3092343956317362483, -5561119517847711700, 972445599196498113, -1558506600978816441,
+ 1708913533482282562, -2305554874185907314, -6005743014309462908, -6653329009633068701,
+ -483583197311151195, 2488075924621352812, -4529369641467339140, -4663743555056261452,
+ 2997203966153298104, 1282559373026354493, 240113143146674385, 8665713329246516443,
+ 628141331766346752, -4651421219668005332, -7750560848702540400, 7596648026010355826,
+ -3132152619100351065, 7834161864828164065, 7103445518877254909, 4390861237357459201,
+ -4780718172614204074, -319889632007444440, 622261699494173647, -3186110786557562560,
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+ -6756087640505506466, 5256026990536851868, 7841086888628396109, 6640857538655893162,
+ -8021284697816458310, -7109857044414059830, -1689021141511844405, -4298087301956291063,
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+ -6320577374581628592, 7208698530190629697, 7276901792339343736, -7490986807540332668,
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+ -4300543082831323144, -6344160503358350167, 5896236396443472108, -758328221503023383,
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+ 8382142935188824023, 9103922860780351547, 4152330101494654406,
+ }
+)
+
+type rngSource struct {
+ tap int // index into vec
+ feed int // index into vec
+ vec [rngLen]int64 // current feedback register
+}
+
+// seed rng x[n+1] = 48271 * x[n] mod (2**31 - 1)
+func seedrand(x int32) int32 {
+ const (
+ A = 48271
+ Q = 44488
+ R = 3399
+ )
+
+ hi := x / Q
+ lo := x % Q
+ x = A*lo - R*hi
+ if x < 0 {
+ x += int32max
+ }
+ return x
+}
+
+// Seed uses the provided seed value to initialize the generator to a deterministic state.
+func (rng *rngSource) Seed(seed int64) {
+ rng.tap = 0
+ rng.feed = rngLen - rngTap
+
+ seed = seed % int32max
+ if seed < 0 {
+ seed += int32max
+ }
+ if seed == 0 {
+ seed = 89482311
+ }
+
+ x := int32(seed)
+ for i := -20; i < rngLen; i++ {
+ x = seedrand(x)
+ if i >= 0 {
+ var u int64
+ u = int64(x) << 40
+ x = seedrand(x)
+ u ^= int64(x) << 20
+ x = seedrand(x)
+ u ^= int64(x)
+ u ^= rngCooked[i]
+ rng.vec[i] = u
+ }
+ }
+}
+
+// Int63 returns a non-negative pseudo-random 63-bit integer as an int64.
+func (rng *rngSource) Int63() int64 {
+ return int64(rng.Uint64() & rngMask)
+}
+
+// Uint64 returns a non-negative pseudo-random 64-bit integer as a uint64.
+func (rng *rngSource) Uint64() uint64 {
+ rng.tap--
+ if rng.tap < 0 {
+ rng.tap += rngLen
+ }
+
+ rng.feed--
+ if rng.feed < 0 {
+ rng.feed += rngLen
+ }
+
+ x := rng.vec[rng.feed] + rng.vec[rng.tap]
+ rng.vec[rng.feed] = x
+ return uint64(x)
+}