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// See LICENSE for license details.
/** Scala-land math helper functions, like logs.
*/
package chisel3.util
import chisel3._
/** Compute the log2 rounded up with min value of 1 */
object log2Up {
def apply(in: BigInt): Int = {
require(in >= 0)
1 max (in-1).bitLength
}
def apply(in: Int): Int = apply(BigInt(in))
}
/** Compute the log2 rounded up */
object log2Ceil {
def apply(in: BigInt): Int = {
require(in > 0)
(in-1).bitLength
}
def apply(in: Int): Int = apply(BigInt(in))
}
/** Compute the log2 rounded down with min value of 1 */
object log2Down {
def apply(in: BigInt): Int = log2Up(in) - (if (isPow2(in)) 0 else 1)
def apply(in: Int): Int = apply(BigInt(in))
}
/** Compute the log2 rounded down */
object log2Floor {
def apply(in: BigInt): Int = log2Ceil(in) - (if (isPow2(in)) 0 else 1)
def apply(in: Int): Int = apply(BigInt(in))
}
/** Check if an Integer is a power of 2 */
object isPow2 {
def apply(in: BigInt): Boolean = in > 0 && ((in & (in-1)) == 0)
def apply(in: Int): Boolean = apply(BigInt(in))
}
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