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• 6.0.0-alpha2
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• ILog.kt

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commonMain.korlibs.math.ILog.kt Maven / Gradle / Ivy

package korlibs.math

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/** Performs a fast integral logarithmic of base two */
fun ilog2(v: Int): Int = if (v == 0) (-1) else (31 - v.countLeadingZeroBits())
// fun ilog2(v: Int): Int = kotlin.math.log2(v.toDouble()).toInt()
fun ilog2Ceil(v: Int): Int = kotlin.math.ceil(kotlin.math.log2(v.toDouble())).toInt()