diff options
Diffstat (limited to 'src/main/scala/firrtl/passes')
| -rw-r--r-- | src/main/scala/firrtl/passes/LowerTypes.scala | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/main/scala/firrtl/passes/LowerTypes.scala b/src/main/scala/firrtl/passes/LowerTypes.scala index 0bd44a8c..7ba320d0 100644 --- a/src/main/scala/firrtl/passes/LowerTypes.scala +++ b/src/main/scala/firrtl/passes/LowerTypes.scala @@ -75,7 +75,12 @@ object LowerTypes extends Transform with DependencyAPIMigration { val memInitByModule = memInitAnnos.map(_.asInstanceOf[MemoryInitAnnotation]).groupBy(_.target.encapsulatingModule) val c = CircuitTarget(state.circuit.main) - val refRenameMap = RenameMap() + // By default, the RenameMap enforces a .distinct invariant for renames. This helps transform + // writers not mess up because violating that invariant can cause problems for transform + // writers. Unfortunately, when you have lots of renames, this is very expensive + // performance-wise. We use a private internal API that does not run .distinct to improve + // performance, but we must be careful to not insert any duplicates. + val refRenameMap = RenameMap.noDistinct() val resultAndRenames = state.circuit.modules.map(m => onModule(c, m, memInitByModule.getOrElse(m.name, Seq()), refRenameMap)) val result = state.circuit.copy(modules = resultAndRenames.map(_._1)) |