#14372: CMM contains a bunch of tail-merging opportunities -------------------------------------+------------------------------------- Reporter: heisenbug | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): It's hard to review code without a spec, or even some input/output examples. And an overview Note to explain the goal and how the impl works would be useful. Based on a very quick look, it seems that you hope to branch from one `CmmProc` to a label in another. That's a huge thing to do, because it messes up all dataflow analyses, which expect to be able to see all the places that jump to a block (e.g. constant propagation). I'm 99% sure that you can't translate it into LLVM. Before you invest a lot more effort, can we debate the goal? There are others on ghc-devs who know about this back-end stuff. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14372#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler