stevedlawrence commented on a change in pull request #316: Assortment of
changes to improve performance
URL: https://github.com/apache/incubator-daffodil/pull/316#discussion_r370365114
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File path:
daffodil-runtime1/src/main/scala/org/apache/daffodil/processors/Evaluatable.scala
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@@ -285,7 +285,17 @@ abstract class Evaluatable[+T <: AnyRef](protected val
ci: DPathCompileInfo, qNa
/**
* Preferred for use in the runtime.
*/
- @inline final def maybeConstant = constValue_.asInstanceOf[Maybe[T]]
+ @inline final def maybeConstant = {
+ // We could just do constValue_.asInstanceOf[Maybe[T]], but the compiled
+ // bytecode ends up allocating a Maybe. Since constant values are accessed
+ // very often, we really want to avoid that overhead. The following gets
+ // rid of those unnecessary allocations.
+ if (constValue_.isDefined) {
+ Maybe[T](constValue_.get.asInstanceOf[T])
Review comment:
There are no other places we do ``asInstanceOf[Maybe[...]]``. I'll try
disassemble things and see if there's anything that jumps out.
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