Ilya Gorbunov
64 lines
1.9 KiB
Kotlin
64 lines
1.9 KiB
Kotlin
/*
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* Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package kotlin.js
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// TODO use declarations from stdlib
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private external class ArrayBuffer(size: Int)
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private external class Float64Array(buffer: ArrayBuffer)
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private external class Float32Array(buffer: ArrayBuffer)
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private external class Int32Array(buffer: ArrayBuffer)
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private val buf = ArrayBuffer(8)
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// TODO use one DataView instead of bunch of typed views.
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private val bufFloat64 = Float64Array(buf).unsafeCast<DoubleArray>()
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private val bufFloat32 = Float32Array(buf).unsafeCast<FloatArray>()
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private val bufInt32 = Int32Array(buf).unsafeCast<IntArray>()
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private val lowIndex = run {
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bufFloat64[0] = -1.0 // bff00000_00000000
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if (bufInt32[0] != 0) 1 else 0
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}
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private val highIndex = 1 - lowIndex
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internal fun doubleToRawBits(value: Double): Long {
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bufFloat64[0] = value
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return Long(bufInt32[lowIndex], bufInt32[highIndex])
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}
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@PublishedApi
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internal fun doubleFromBits(value: Long): Double {
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bufInt32[lowIndex] = value.low
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bufInt32[highIndex] = value.high
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return bufFloat64[0]
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}
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internal fun floatToRawBits(value: Float): Int {
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bufFloat32[0] = value
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return bufInt32[0]
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}
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@PublishedApi
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internal fun floatFromBits(value: Int): Float {
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bufInt32[0] = value
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return bufFloat32[0]
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}
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// returns zero value for number with positive sign bit and non-zero value for number with negative sign bit.
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internal fun doubleSignBit(value: Double): Int {
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bufFloat64[0] = value
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return bufInt32[highIndex] and Int.MIN_VALUE
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}
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internal fun getNumberHashCode(obj: Double): Int {
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@Suppress("DEPRECATED_IDENTITY_EQUALS")
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if (jsBitwiseOr(obj, 0).unsafeCast<Double>() === obj) {
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return obj.toInt()
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}
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bufFloat64[0] = obj
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return bufInt32[highIndex] * 31 + bufInt32[lowIndex]
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}
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