Expand optimization of Array(e1, ..., en) to primitive arrays.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/nsc/transform/CleanUp.scala b/src/compiler/scala/tools/nsc/transform/CleanUp.scala
index bdcebf47b8..4f145d3d7e 100644
--- a/src/compiler/scala/tools/nsc/transform/CleanUp.scala
+++ b/src/compiler/scala/tools/nsc/transform/CleanUp.scala
@@ -629,6 +629,13 @@ abstract class CleanUp extends Transform with ast.TreeDSL {
             _.tpe.resultType.dealias.typeSymbol == ObjectClass  // [T: ClassTag](xs: T*): Array[T] post erasure
           }) =>
         super.transform(arg)
+      case Apply(appMeth, List(elem0, Apply(wrapArrayMeth, List(rest @ ArrayValue(elemtpt, _)))))
+      if wrapArrayMeth.symbol == Predef_wrapArray(elemtpt.tpe) &&
+         appMeth.symbol == ArrayModule_overloadedApply.suchThat {
+           tp => tp.tpe.paramss.flatten.lift.apply(1).exists(_.tpe.typeSymbol == SeqClass) &&
+             tp.tpe.resultType =:= arrayType(elemtpt.tpe) // (p1: AnyVal1, ps: AnyVal1*): Array[AnyVal1] post erasure
+         } =>
+        super.transform(rest.copy(elems = elem0 :: rest.elems))
 
       case _ =>
         super.transform(tree)