[GHC] #12028: Large let bindings are 6x slower (since 6.12.x to 7.10.x)

[GHC]

#12028: Large let bindings are 6x slower (since 6.12.x to 7.10.x)
-------------------------------------+-------------------------------------
        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):

 On 8.0 rc2:

 {{{

 $ time ghc -O2 -fforce-recomp regression-md5.hs
 [1 of 1] Compiling Data.Digest.Pure.MD5 ( regression-md5.hs, regression-
 md5.o )

 real    0m1.497s
 user    0m1.460s
 sys     0m0.028s
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12028#comment:2>
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