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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

Calling this on Data creates an annotation that Chisel emits to a separate annotations file. This file must be passed to FIRRTL independently of the .fir file. The execute methods in chisel3.Driver will pass the annotations to FIRRTL automatically.

,

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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  4. def apply[T <: Data](data: T)(implicit compileOptions: CompileOptions): 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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