There used to be a subset of Android Renderscript called Filterscript. It was supposed to execute faster than Renderscript on some devices due to reduced complexity. Here is a thread about Filterscript on SO.
Although Filterscript was officially announced just one version ago (4.2) I can't find Filterscript mentioned in the current (4.3) Android Renderscript documentation any more.
So the question is: What happened to Filterscript? Does the distinction between RS and FS still make sense? Has it been deprecated?