#8457: -ffull-laziness does more harm than good -------------------------------------+------------------------------------ Reporter: errge | Owner: Type: bug | Status: new Priority: high | Milestone: 7.8.1 Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by rwbarton): Very nice work! I just want to point out a [http://ghc.haskell.org/trac/ghc/ticket/7367#comment:7 suggestion] I made a little while ago, but haven't followed up on: it may be easy to identify certain occurrences of let-floating that are truly "safe" performance- wise, and control them with a separate flag, which would be on by default under `-O`. Then remove `-ffull-laziness` from `-O`. I would be interested to see the results of your experiment with such a patch. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8457#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler