[GHC] #9229: Compiler memory use regression

[GHC]

#9229: Compiler memory use regression
-------------------------------------+-------------------------------------
              Reporter:  augustss    |            Owner:
                  Type:  bug         |           Status:  infoneeded
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.2
            Resolution:              |         Keywords:
      Operating System:  Windows     |     Architecture:  Unknown/Multiple
       Type of failure:  Compile-    |       Difficulty:  Unknown
  time performance bug               |       Blocked By:
             Test Case:              |  Related Tickets:  #8852, #8980,
              Blocking:              |  #8941, 8960, #7898, #7068, #7944,
Differential Revisions:              |  #5550, #8836
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => infoneeded
 * related:   => #8852, #8980, #8941, 8960, #7898, #7068, #7944, #5550,
              #8836


Comment:

 Can you try to compile your module with either HEAD (the master branch) or
 the ghc-7.8 [wiki:Building/GettingTheSources branch]? Those branches
 contain the following bug fix, which should solve your problem:

 {{{
 commit af4bc31c50c873344a2426d4be842f92edf17019
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Mon Aug 25 12:28:44 2014 +0100

     Do not duplicate call information in SpecConstr (Trac #8852)

     This long-standing and egregious bug meant that call information was
     being gratuitously copied, leading to an exponential blowup in the
     number of calls to be examined when function definitions are deeply
     nested.  That is what has been causing the blowup in SpecConstr's
     running time, not (as I had previously supposed) generating very large
 code.

     See Note [spec_usg includes rhs_usg]
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9229#comment:3>
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