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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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  2. final def ##: Int
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  3. 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

  5. final def asInstanceOf[T0]: T0
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  6. def clone(): AnyRef
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  7. final def eq(arg0: AnyRef): Boolean
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  12. final def ne(arg0: AnyRef): Boolean
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  13. final def notify(): Unit
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  14. final def notifyAll(): Unit
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  15. final def synchronized[T0](arg0: => T0): T0
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  17. final def wait(arg0: Long, arg1: Int): Unit
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  19. final def wait(): Unit
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  1. def finalize(): Unit
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