[GHC] #12032: Performance regression with large numbers of equation-style decls

[GHC]

#12032: Performance regression with large numbers of equation-style decls
-------------------------------------+-------------------------------------
        Reporter:  tommd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      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:                    |
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Comment (by tommd):

 Things have improves since 7.10.x but are still behind 6.12.x:


 {{{
 vagrant at debian-jessie:~$ time ghc-6.12.3 -O2 -c -fforce-recomp regression-
 cpoly.hs

 real    0m0.069s
 user    0m0.056s
 sys     0m0.004s
 vagrant at debian-jessie:~$ time ghc-7.10.3 -O2 -c -fforce-recomp regression-
 cpoly.hs

 real    0m0.498s
 user    0m0.160s
 sys     0m0.064s
 vagrant at debian-jessie:~$ time ghc-8.0.0.20160204 -O2 -c -fforce-recomp
 regression-cpoly.hs

 real    0m0.225s
 user    0m0.196s
 sys     0m0.028s
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12032#comment:2>
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