[GHC] #9345: Data.List.inits is extremely slow

[GHC]

#9345: Data.List.inits is extremely slow
-------------------------------------+-------------------------------------
              Reporter:  dfeuer      |            Owner:
                  Type:  bug         |           Status:  patch
              Priority:  high        |        Milestone:  7.8.4
             Component:              |          Version:  7.8.3
  libraries/base                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:  Runtime     |       Blocked By:
  performance bug                    |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------

Comment (by nomeata):

 I’m really worryied seeing `INLINE` on such a rather large function.
 Doesn’t that mean that we will never use the compiled `inits` from the
 library but rather re-compile it at every use site? That does not seem to
 be good. (Disclaimer: Have not actually tried it.)

 I have run criterion on HEAD earlier, I might be able to set it up again.
 Do you have a ready-to-run benchmark that you would like me to run?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9345#comment:18>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler