Add WireInit.apply that accepts DontCare (#731)

Prevents DontCare from affecting type inference
Fixes #728

1 files changed, 8 insertions, 1 deletions

diff --git a/chiselFrontend/src/main/scala/chisel3/core/Data.scala b/chiselFrontend/src/main/scala/chisel3/core/Data.scala
index db99d6b3..19adf01b 100644
--- a/chiselFrontend/src/main/scala/chisel3/core/Data.scala
+++ b/chiselFrontend/src/main/scala/chisel3/core/Data.scala
@@ -451,13 +451,20 @@ object WireInit {
     apply(model, init)
   }
 
-  def apply[T <: Data](t: T, init: T)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): T = {
+  private def applyImpl[T <: Data](t: T, init: Data)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): T = {
     implicit val noSourceInfo = UnlocatableSourceInfo
     val x = Wire(t)
     requireIsHardware(init, "wire initializer")
     x := init
     x
   }
+
+  def apply[T <: Data](t: T, init: T)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): T = {
+    applyImpl(t, init)
+  }
+  def apply[T <: Data](t: T, init: DontCare.type)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): T = {
+    applyImpl(t, init)
+  }
 }
 
 /** RHS (source) for Invalidate API.