Convert PreservesAll to explicit invalidates=false

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala b/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala
index f6990082..a1e49d62 100644
--- a/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala
+++ b/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala
@@ -5,7 +5,7 @@ package firrtl.transforms
 import firrtl.{CircuitState, DependencyAPIMigration, Namespace, PrimOps, Transform, Utils, WRef}
 import firrtl.ir._
 import firrtl.Mappers._
-import firrtl.options.{Dependency, PreservesAll}
+import firrtl.options.Dependency
 import firrtl.PrimOps.{Add, AsSInt, Sub, Tail}
 import firrtl.stage.Forms
 
@@ -107,7 +107,7 @@ object FixAddingNegativeLiterals {
   * the literal and thus not all expressions in the add are the same. This is fixed here when we directly
   * subtract the literal instead.
   */
-class FixAddingNegativeLiterals extends Transform with DependencyAPIMigration with PreservesAll[Transform] {
+class FixAddingNegativeLiterals extends Transform with DependencyAPIMigration {
 
   override def prerequisites = Forms.LowFormMinimumOptimized :+ Dependency[BlackBoxSourceHelper]
 
@@ -115,6 +115,8 @@ class FixAddingNegativeLiterals extends Transform with DependencyAPIMigration wi
 
   override def optionalPrerequisiteOf = Seq.empty
 
+  override def invalidates(a: Transform) = false
+
   def execute(state: CircuitState): CircuitState = {
     val modulesx = state.circuit.modules.map(FixAddingNegativeLiterals.fixupModule)
     state.copy(circuit = state.circuit.copy(modules = modulesx))