#10397: Compiler performance regression 7.6 -> 7.8 in elimCommonBlocks -------------------------------------+------------------------------------- Reporter: TobyGoodwin | Owner: Type: bug | Status: merge Priority: normal | Milestone: 7.10.2 Component: Compiler | Version: 7.8.4 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | performance Type of failure: None/Unknown | Architecture: Blocked By: | Unknown/Multiple Related Tickets: | Test Case: see ticket | Blocking: | Differential Revisions: Phab:D892 | Phab:D896 -------------------------------------+------------------------------------- Comment (by TobyGoodwin): Fantastic work on this. Can I just point out that it ''is'' real-world code? It's the yesod backend for [https://www.mythic- beasts.com/auth/register this web page] and I stumbled across this problem simply by trying to upgrade from 7.6 to 7.8. Which brings me to another point: it's great that this will be in 7.10. Is there any chance of getting it into 7.8 too? Most of the distros (Debian, Ubuntu LTS, even Fedora) have not made the jump to 7.8 yet, and when they do I'd hate for anyone else to have the same experience that I did, of a massive slowdown in compile times. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10397#comment:31 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler