object dontTouch
Marks that a signal's leaves are 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
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's leaves marked as dontTouch.
Example:
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Mark a signal's leaves as an optimization barrier to Chisel and FIRRTL.
Mark a signal's leaves 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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