id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
7219,Reinstate constant propagation in some form,simonmar,,"The new codegen doesn't have a constant propagation pass.  This used to be done by the mini-inliner which was ad-hoc at best; instead of the mini-inliner we now have `CmmSink` which is much less ad-hoc but doesn't do constant folding or propagation.

This is a regression that will affect performance of things like `copyArray#`, so we should fix it before the release.
",bug,closed,highest,7.8.1,Compiler,7.7,fixed,,tibbe,Unknown/Multiple,Unknown/Multiple,Runtime performance bug,Unknown,,,,