[GHC] #10852: ghc 7.8.4 on arm - panic: Simplifier ticks exhausted

[GHC]

#10852: ghc 7.8.4 on arm - panic: Simplifier ticks exhausted
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        Reporter:  andrewufrank        |                Owner:
            Type:  bug                 |               Status:  new
        Priority:  normal              |            Milestone:
       Component:  Compiler            |              Version:  7.10.2
      Resolution:                      |             Keywords:  arm
Operating System:  Linux               |         Architecture:  arm
 Type of failure:  Compile-time crash  |            Test Case:
      Blocked By:                      |             Blocking:
 Related Tickets:  #5642, #9675        |  Differential Rev(s):
       Wiki Page:                      |
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Comment (by bgamari):

 While I have no problem compiling `Conll`, the `Brown` module is indeed
 quite problematic, even on my laptop. This module produces an absolutely
 absurd amount of Core which appears to originate from the generic
 `Serialize` instances for the quite large `Tag` type.

 The attached `Test.hs` reproduces the blow-up. While the code size starts
 large-but-not insane,
 {{{
 Result size of Desugar (after optimization)
   = {terms: 25,522, types: 972,788, coercions: 376,020}
 }}}
 Things quickly balloon during float-out,
 {{{
 *** Float out(FOS {Lam = Just 0, Consts = True, OverSatApps = False}):
 Result size of Float out(FOS {Lam = Just 0,
                               Consts = True,
                               OverSatApps = False})
   = {terms: 254,872, types: 3,162,281, coercions: 634,615}
 }}}
 which the simplifier, through a great deal of effort, manages to reduce
 down to,
 {{{
 Result size of CorePrep
   = {terms: 49,840, types: 1,752,631, coercions: 442,468}
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10852#comment:10>
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