[GHC] #10800: vector-0.11 compile time increased substantially with 7.10.1

[GHC]

#10800: vector-0.11 compile time increased substantially with 7.10.1
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by erikd):

 From IRC:

 {{{
 <bgamari> erikd, IIRC I have a more minimal testcase as well
 <bgamari> the problem centers around zip
 <bgamari> when things are inlined has changed
 <bgamari> which results in a large number of stream fusion primitives that
           can't be resolved until late in compilation
 <bgamari> which produces a large amount of code
 <bgamari> erikd, that should at least be a hint
 <bgamari> unfortunately I ran out of time before identifying the root
 cause
 <bgamari> erikd, https://gist.github.com/bgamari/2ca0f7d2a4e0b6447aee
 <bgamari> erikd, that's my minimized testcase
 <erikd>   thanks, i'll check it out
 <bgamari> It helps to look at the -dverbose-core2core output
 <bgamari> comparing between the relevant compiler versions
 <bgamari> erikd, this utility may come in handy for turning the
           verbose-core2core output into something less unwieldy
 <bgamari> https://github.com/bgamari/ghc-utils/blob/master/split-
 core2core.py
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10800#comment:14>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler