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o

chisel3

dontTouch

object dontTouch

Marks that a signal is an optimization barrier to Chisel and the FIRRTL compiler. This has the effect of guaranteeing that a signal will not be removed.

Source
dontTouch.scala
Example:

  1. class MyModule extends Module {
  val io = IO(new Bundle {
    val a = Input(UInt(32.W))
    val b = Output(UInt(32.W))
  })
  io.b := io.a
  val dead = io.a +% 1.U // normally dead would be pruned by DCE
  dontTouch(dead) // Marking it as such will preserve it
}
Note

Because this is an optimization barrier, constants will not be propagated through a signal marked as dontTouch.

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  1. final def !=(arg0: Any): Boolean
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  3. final def ==(arg0: Any): Boolean
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  4. def apply[T <: Data](data: T): T

    Mark a signal as an optimization barrier to Chisel and FIRRTL.

    Mark a signal as an optimization barrier to Chisel and FIRRTL.

    data

    The signal to be marked

    returns

    Unmodified signal data

    Note

    Requires the argument to be bound to hardware

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