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GODRIVER-2361 Refactor pseudo-random number and UUID generation with "golang.org/x/exp/rand" (#945)
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‎.golangci.yml

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# "benchmark" directories.
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- path: (internal\/|benchmark\/)
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text: exported (.+) should have comment( \(or a comment on this block\))? or be unexported
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# Disable deadcode and unused linter for "golang.org/x/exp/rand" package in internal/randutil/rand.
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- path: internal/randutil/rand
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linters:
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- deadcode
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- unused
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- varcheck

‎THIRD-PARTY-NOTICES

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@@ -243,6 +243,70 @@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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---------------------------------------------------------------------
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License notice for rand code from golang.org/x/exp
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---------------------------------------------------------------------
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Copyright (c) 2009 The Go Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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---------------------------------------------------------------------
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License notice for Add64 and Mul64 code from github.com/golang/go
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---------------------------------------------------------------------
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Copyright (c) 2009 The Go Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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License notice for github.com/davecgh/go-spew
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----------------------------------------------------------------------

‎internal/randutil/rand/bits.go

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// Copied from https://cs.opensource.google/go/go/+/946b4baaf6521d521928500b2b57429c149854e7:src/math/bits.go
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package rand
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// Add64 returns the sum with carry of x, y and carry: sum = x + y + carry.
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// The carry input must be 0 or 1; otherwise the behavior is undefined.
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// The carryOut output is guaranteed to be 0 or 1.
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func Add64(x, y, carry uint64) (sum, carryOut uint64) {
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yc := y + carry
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sum = x + yc
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if sum < x || yc < y {
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carryOut = 1
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}
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return
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}
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// Mul64 returns the 128-bit product of x and y: (hi, lo) = x * y
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// with the product bits' upper half returned in hi and the lower
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// half returned in lo.
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func Mul64(x, y uint64) (hi, lo uint64) {
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const mask32 = 1<<32 - 1
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x0 := x & mask32
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x1 := x >> 32
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y0 := y & mask32
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y1 := y >> 32
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w0 := x0 * y0
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t := x1*y0 + w0>>32
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w1 := t & mask32
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w2 := t >> 32
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w1 += x0 * y1
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hi = x1*y1 + w2 + w1>>32
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lo = x * y
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return
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}

‎internal/randutil/rand/exp.go

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// Copied from https://cs.opensource.google/go/x/exp/+/24438e51023af3bfc1db8aed43c1342817e8cfcd:rand/exp.go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package rand
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import (
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"math"
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)
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/*
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* Exponential distribution
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*
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* See "The Ziggurat Method for Generating Random Variables"
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* (Marsaglia & Tsang, 2000)
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* http://www.jstatsoft.org/v05/i08/paper [pdf]
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*/
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const (
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re = 7.69711747013104972
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)
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// ExpFloat64 returns an exponentially distributed float64 in the range
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// (0, +math.MaxFloat64] with an exponential distribution whose rate parameter
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// (lambda) is 1 and whose mean is 1/lambda (1).
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// To produce a distribution with a different rate parameter,
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// callers can adjust the output using:
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//
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// sample = ExpFloat64() / desiredRateParameter
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func (r *Rand) ExpFloat64() float64 {
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for {
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j := r.Uint32()
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i := j & 0xFF
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x := float64(j) * float64(we[i])
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if j < ke[i] {
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return x
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}
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if i == 0 {
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return re - math.Log(r.Float64())
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}
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if fe[i]+float32(r.Float64())*(fe[i-1]-fe[i]) < float32(math.Exp(-x)) {
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return x
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}
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}
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}
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var ke = [256]uint32{
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0xe290a139, 0x0, 0x9beadebc, 0xc377ac71, 0xd4ddb990,
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0xde893fb8, 0xe4a8e87c, 0xe8dff16a, 0xebf2deab, 0xee49a6e8,
52+
0xf0204efd, 0xf19bdb8e, 0xf2d458bb, 0xf3da104b, 0xf4b86d78,
53+
0xf577ad8a, 0xf61de83d, 0xf6afb784, 0xf730a573, 0xf7a37651,
54+
0xf80a5bb6, 0xf867189d, 0xf8bb1b4f, 0xf9079062, 0xf94d70ca,
55+
0xf98d8c7d, 0xf9c8928a, 0xf9ff175b, 0xfa319996, 0xfa6085f8,
56+
0xfa8c3a62, 0xfab5084e, 0xfadb36c8, 0xfaff0410, 0xfb20a6ea,
57+
0xfb404fb4, 0xfb5e2951, 0xfb7a59e9, 0xfb95038c, 0xfbae44ba,
58+
0xfbc638d8, 0xfbdcf892, 0xfbf29a30, 0xfc0731df, 0xfc1ad1ed,
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0xfc2d8b02, 0xfc3f6c4d, 0xfc5083ac, 0xfc60ddd1, 0xfc708662,
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0xfc7f8810, 0xfc8decb4, 0xfc9bbd62, 0xfca9027c, 0xfcb5c3c3,
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0xfcc20864, 0xfccdd70a, 0xfcd935e3, 0xfce42ab0, 0xfceebace,
62+
0xfcf8eb3b, 0xfd02c0a0, 0xfd0c3f59, 0xfd156b7b, 0xfd1e48d6,
63+
0xfd26daff, 0xfd2f2552, 0xfd372af7, 0xfd3eeee5, 0xfd4673e7,
64+
0xfd4dbc9e, 0xfd54cb85, 0xfd5ba2f2, 0xfd62451b, 0xfd68b415,
65+
0xfd6ef1da, 0xfd750047, 0xfd7ae120, 0xfd809612, 0xfd8620b4,
66+
0xfd8b8285, 0xfd90bcf5, 0xfd95d15e, 0xfd9ac10b, 0xfd9f8d36,
67+
0xfda43708, 0xfda8bf9e, 0xfdad2806, 0xfdb17141, 0xfdb59c46,
68+
0xfdb9a9fd, 0xfdbd9b46, 0xfdc170f6, 0xfdc52bd8, 0xfdc8ccac,
69+
0xfdcc542d, 0xfdcfc30b, 0xfdd319ef, 0xfdd6597a, 0xfdd98245,
70+
0xfddc94e5, 0xfddf91e6, 0xfde279ce, 0xfde54d1f, 0xfde80c52,
71+
0xfdeab7de, 0xfded5034, 0xfdefd5be, 0xfdf248e3, 0xfdf4aa06,
72+
0xfdf6f984, 0xfdf937b6, 0xfdfb64f4, 0xfdfd818d, 0xfdff8dd0,
73+
0xfe018a08, 0xfe03767a, 0xfe05536c, 0xfe07211c, 0xfe08dfc9,
74+
0xfe0a8fab, 0xfe0c30fb, 0xfe0dc3ec, 0xfe0f48b1, 0xfe10bf76,
75+
0xfe122869, 0xfe1383b4, 0xfe14d17c, 0xfe1611e7, 0xfe174516,
76+
0xfe186b2a, 0xfe19843e, 0xfe1a9070, 0xfe1b8fd6, 0xfe1c8289,
77+
0xfe1d689b, 0xfe1e4220, 0xfe1f0f26, 0xfe1fcfbc, 0xfe2083ed,
78+
0xfe212bc3, 0xfe21c745, 0xfe225678, 0xfe22d95f, 0xfe234ffb,
79+
0xfe23ba4a, 0xfe241849, 0xfe2469f2, 0xfe24af3c, 0xfe24e81e,
80+
0xfe25148b, 0xfe253474, 0xfe2547c7, 0xfe254e70, 0xfe25485a,
81+
0xfe25356a, 0xfe251586, 0xfe24e88f, 0xfe24ae64, 0xfe2466e1,
82+
0xfe2411df, 0xfe23af34, 0xfe233eb4, 0xfe22c02c, 0xfe22336b,
83+
0xfe219838, 0xfe20ee58, 0xfe20358c, 0xfe1f6d92, 0xfe1e9621,
84+
0xfe1daef0, 0xfe1cb7ac, 0xfe1bb002, 0xfe1a9798, 0xfe196e0d,
85+
0xfe1832fd, 0xfe16e5fe, 0xfe15869d, 0xfe141464, 0xfe128ed3,
86+
0xfe10f565, 0xfe0f478c, 0xfe0d84b1, 0xfe0bac36, 0xfe09bd73,
87+
0xfe07b7b5, 0xfe059a40, 0xfe03644c, 0xfe011504, 0xfdfeab88,
88+
0xfdfc26e9, 0xfdf98629, 0xfdf6c83b, 0xfdf3ec01, 0xfdf0f04a,
89+
0xfdedd3d1, 0xfdea953d, 0xfde7331e, 0xfde3abe9, 0xfddffdfb,
90+
0xfddc2791, 0xfdd826cd, 0xfdd3f9a8, 0xfdcf9dfc, 0xfdcb1176,
91+
0xfdc65198, 0xfdc15bb3, 0xfdbc2ce2, 0xfdb6c206, 0xfdb117be,
92+
0xfdab2a63, 0xfda4f5fd, 0xfd9e7640, 0xfd97a67a, 0xfd908192,
93+
0xfd8901f2, 0xfd812182, 0xfd78d98e, 0xfd7022bb, 0xfd66f4ed,
94+
0xfd5d4732, 0xfd530f9c, 0xfd48432b, 0xfd3cd59a, 0xfd30b936,
95+
0xfd23dea4, 0xfd16349e, 0xfd07a7a3, 0xfcf8219b, 0xfce7895b,
96+
0xfcd5c220, 0xfcc2aadb, 0xfcae1d5e, 0xfc97ed4e, 0xfc7fe6d4,
97+
0xfc65ccf3, 0xfc495762, 0xfc2a2fc8, 0xfc07ee19, 0xfbe213c1,
98+
0xfbb8051a, 0xfb890078, 0xfb5411a5, 0xfb180005, 0xfad33482,
99+
0xfa839276, 0xfa263b32, 0xf9b72d1c, 0xf930a1a2, 0xf889f023,
100+
0xf7b577d2, 0xf69c650c, 0xf51530f0, 0xf2cb0e3c, 0xeeefb15d,
101+
0xe6da6ecf,
102+
}
103+
var we = [256]float32{
104+
2.0249555e-09, 1.486674e-11, 2.4409617e-11, 3.1968806e-11,
105+
3.844677e-11, 4.4228204e-11, 4.9516443e-11, 5.443359e-11,
106+
5.905944e-11, 6.344942e-11, 6.7643814e-11, 7.1672945e-11,
107+
7.556032e-11, 7.932458e-11, 8.298079e-11, 8.654132e-11,
108+
9.0016515e-11, 9.3415074e-11, 9.674443e-11, 1.0001099e-10,
109+
1.03220314e-10, 1.06377254e-10, 1.09486115e-10, 1.1255068e-10,
110+
1.1557435e-10, 1.1856015e-10, 1.2151083e-10, 1.2442886e-10,
111+
1.2731648e-10, 1.3017575e-10, 1.3300853e-10, 1.3581657e-10,
112+
1.3860142e-10, 1.4136457e-10, 1.4410738e-10, 1.4683108e-10,
113+
1.4953687e-10, 1.5222583e-10, 1.54899e-10, 1.5755733e-10,
114+
1.6020171e-10, 1.6283301e-10, 1.6545203e-10, 1.6805951e-10,
115+
1.7065617e-10, 1.732427e-10, 1.7581973e-10, 1.7838787e-10,
116+
1.8094774e-10, 1.8349985e-10, 1.8604476e-10, 1.8858298e-10,
117+
1.9111498e-10, 1.9364126e-10, 1.9616223e-10, 1.9867835e-10,
118+
2.0119004e-10, 2.0369768e-10, 2.0620168e-10, 2.087024e-10,
119+
2.1120022e-10, 2.136955e-10, 2.1618855e-10, 2.1867974e-10,
120+
2.2116936e-10, 2.2365775e-10, 2.261452e-10, 2.2863202e-10,
121+
2.311185e-10, 2.3360494e-10, 2.360916e-10, 2.3857874e-10,
122+
2.4106667e-10, 2.4355562e-10, 2.4604588e-10, 2.485377e-10,
123+
2.5103128e-10, 2.5352695e-10, 2.560249e-10, 2.585254e-10,
124+
2.6102867e-10, 2.6353494e-10, 2.6604446e-10, 2.6855745e-10,
125+
2.7107416e-10, 2.7359479e-10, 2.761196e-10, 2.7864877e-10,
126+
2.8118255e-10, 2.8372119e-10, 2.8626485e-10, 2.888138e-10,
127+
2.9136826e-10, 2.939284e-10, 2.9649452e-10, 2.9906677e-10,
128+
3.016454e-10, 3.0423064e-10, 3.0682268e-10, 3.0942177e-10,
129+
3.1202813e-10, 3.1464195e-10, 3.1726352e-10, 3.19893e-10,
130+
3.2253064e-10, 3.251767e-10, 3.2783135e-10, 3.3049485e-10,
131+
3.3316744e-10, 3.3584938e-10, 3.3854083e-10, 3.4124212e-10,
132+
3.4395342e-10, 3.46675e-10, 3.4940711e-10, 3.5215003e-10,
133+
3.5490397e-10, 3.5766917e-10, 3.6044595e-10, 3.6323455e-10,
134+
3.660352e-10, 3.6884823e-10, 3.7167386e-10, 3.745124e-10,
135+
3.773641e-10, 3.802293e-10, 3.8310827e-10, 3.860013e-10,
136+
3.8890866e-10, 3.918307e-10, 3.9476775e-10, 3.9772008e-10,
137+
4.0068804e-10, 4.0367196e-10, 4.0667217e-10, 4.09689e-10,
138+
4.1272286e-10, 4.1577405e-10, 4.1884296e-10, 4.2192994e-10,
139+
4.250354e-10, 4.281597e-10, 4.313033e-10, 4.3446652e-10,
140+
4.3764986e-10, 4.408537e-10, 4.4407847e-10, 4.4732465e-10,
141+
4.5059267e-10, 4.5388301e-10, 4.571962e-10, 4.6053267e-10,
142+
4.6389292e-10, 4.6727755e-10, 4.70687e-10, 4.741219e-10,
143+
4.7758275e-10, 4.810702e-10, 4.845848e-10, 4.8812715e-10,
144+
4.9169796e-10, 4.9529775e-10, 4.989273e-10, 5.0258725e-10,
145+
5.0627835e-10, 5.100013e-10, 5.1375687e-10, 5.1754584e-10,
146+
5.21369e-10, 5.2522725e-10, 5.2912136e-10, 5.330522e-10,
147+
5.370208e-10, 5.4102806e-10, 5.45075e-10, 5.491625e-10,
148+
5.532918e-10, 5.5746385e-10, 5.616799e-10, 5.6594107e-10,
149+
5.7024857e-10, 5.746037e-10, 5.7900773e-10, 5.834621e-10,
150+
5.8796823e-10, 5.925276e-10, 5.971417e-10, 6.018122e-10,
151+
6.065408e-10, 6.113292e-10, 6.1617933e-10, 6.2109295e-10,
152+
6.260722e-10, 6.3111916e-10, 6.3623595e-10, 6.4142497e-10,
153+
6.4668854e-10, 6.5202926e-10, 6.5744976e-10, 6.6295286e-10,
154+
6.6854156e-10, 6.742188e-10, 6.79988e-10, 6.858526e-10,
155+
6.9181616e-10, 6.978826e-10, 7.04056e-10, 7.103407e-10,
156+
7.167412e-10, 7.2326256e-10, 7.2990985e-10, 7.366886e-10,
157+
7.4360473e-10, 7.5066453e-10, 7.5787476e-10, 7.6524265e-10,
158+
7.7277595e-10, 7.80483e-10, 7.883728e-10, 7.9645507e-10,
159+
8.047402e-10, 8.1323964e-10, 8.219657e-10, 8.309319e-10,
160+
8.401528e-10, 8.496445e-10, 8.594247e-10, 8.6951274e-10,
161+
8.799301e-10, 8.9070046e-10, 9.018503e-10, 9.134092e-10,
162+
9.254101e-10, 9.378904e-10, 9.508923e-10, 9.644638e-10,
163+
9.786603e-10, 9.935448e-10, 1.0091913e-09, 1.025686e-09,
164+
1.0431306e-09, 1.0616465e-09, 1.08138e-09, 1.1025096e-09,
165+
1.1252564e-09, 1.1498986e-09, 1.1767932e-09, 1.206409e-09,
166+
1.2393786e-09, 1.276585e-09, 1.3193139e-09, 1.3695435e-09,
167+
1.4305498e-09, 1.508365e-09, 1.6160854e-09, 1.7921248e-09,
168+
}
169+
var fe = [256]float32{
170+
1, 0.9381437, 0.90046996, 0.87170434, 0.8477855, 0.8269933,
171+
0.8084217, 0.7915276, 0.77595687, 0.7614634, 0.7478686,
172+
0.7350381, 0.72286767, 0.71127474, 0.70019263, 0.6895665,
173+
0.67935055, 0.6695063, 0.66000086, 0.65080583, 0.6418967,
174+
0.63325197, 0.6248527, 0.6166822, 0.60872537, 0.60096896,
175+
0.5934009, 0.58601034, 0.5787874, 0.57172304, 0.5648092,
176+
0.5580383, 0.5514034, 0.5448982, 0.5385169, 0.53225386,
177+
0.5261042, 0.52006316, 0.5141264, 0.50828975, 0.5025495,
178+
0.496902, 0.49134386, 0.485872, 0.48048335, 0.4751752,
179+
0.46994483, 0.46478975, 0.45970762, 0.45469615, 0.44975325,
180+
0.44487688, 0.44006512, 0.43531612, 0.43062815, 0.42599955,
181+
0.42142874, 0.4169142, 0.41245446, 0.40804818, 0.403694,
182+
0.3993907, 0.39513698, 0.39093173, 0.38677382, 0.38266218,
183+
0.37859577, 0.37457356, 0.37059465, 0.3666581, 0.362763,
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}

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