Svyatoslav Kuzmich
29 lines
712 B
Kotlin
29 lines
712 B
Kotlin
/*
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* Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
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* that can be found in the license/LICENSE.txt file.
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*/
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package kotlin.random
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import kotlin.math.pow
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// TODO: use stdlib file when math.pow is fixed
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internal actual fun defaultPlatformRandom(): Random =
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Random(js("(Math.random() * Math.pow(2, 32)) | 0").unsafeCast<Int>())
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internal actual fun fastLog2(value: Int): Int {
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// TODO: not so fast, make faster
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var v = value
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var log = -1
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while (v != 0) {
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v = v.ushr(1)
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log++
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}
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return log
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}
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internal actual fun doubleFromParts(hi26: Int, low27: Int): Double =
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hi26 * (2.0.pow(-26)) + low27 * (2.0.pow(-53))
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