regs: remove duplicate ShiftReg file which is now in rocket-chip

src/main/scala/util/ShiftRegister.scala

@@ -1,54 +0,0 @@
-// See LICENSE for license details.
-package sifive.blocks.util
-
-import Chisel._
-
-object ShiftRegisterInit {
-  def apply[T <: Data](in: T, n: Int, init: T): T =
-    (0 until n).foldLeft(in) {
-      case (next, _) => Reg(next, next = next, init = init)
-    }
-}
-
-
-// Similar to the Chisel ShiftRegister but allows the user to suggest a
-// name to the registers within the module that get instantiated
-object ShiftRegister
-{
-  /** Returns the n-cycle delayed version of the input signal.
-    *
-    * @param in input to delay
-    * @param n number of cycles to delay
-    * @param en enable the shift
-    * @param name set the elaborated name of the registers.
-    */
-  def apply[T <: Chisel.Data](in: T, n: Int, en: Chisel.Bool = Chisel.Bool(true), name: Option[String] = None): T = {
-    // The order of tests reflects the expected use cases.
-    if (n != 0) {
-      val r = Chisel.RegEnable(apply(in, n-1, en, name), en)
-      if (name.isDefined) r.suggestName(s"${name.get}_sync_${n-1}")
-      r
-    } else {
-      in
-    }
-  }
-
-  /** Returns the n-cycle delayed version of the input signal with reset initialization.
-    *
-    * @param in input to delay
-    * @param n number of cycles to delay
-    * @param resetData reset value for each register in the shift
-    * @param en enable the shift
-    * @param name set the elaborated name of the registers.
-    */
-  def apply[T <: Chisel.Data](in: T, n: Int, resetData: T, en: Chisel.Bool, name: Option[String]): T = {
-    // The order of tests reflects the expected use cases.
-    if (n != 0) {
-      val r = Chisel.RegEnable(apply(in, n-1, resetData, en, name), resetData, en)
-      if (name.isDefined) r.suggestName(s"${name.get}_sync_${n-1}")
-      r
-    } else {
-      in
-    }
-  }
-}