[GHC] #5361: regSpill: out of spill slots!

[GHC]

#5361: regSpill: out of spill slots!
-----------------------------------------------------+----------------------
  Reporter:  markwright                              |          Owner:  igloo                    
      Type:  bug                                     |         Status:  closed                   
  Priority:  highest                                 |      Milestone:  7.2.1                    
 Component:  Compiler                                |        Version:  7.1                      
Resolution:  fixed                                   |       Keywords:  regSpill panic impossible
        Os:  Linux                                   |   Architecture:  x86_64 (amd64)           
   Failure:  Compile-time crash                      |     Difficulty:  Unknown                  
  Testcase:  http://hackage.haskell.org/package/SHA  |      Blockedby:                           
  Blocking:                                          |        Related:                           
-----------------------------------------------------+----------------------
Changes (by igloo):

  * difficulty:  => Unknown


Old description:

> runghc ./Setup.hs build
> Building SHA-1.5.0.0...
> Preprocessing library SHA-1.5.0.0...
> [1 of 1] Compiling Data.Digest.Pure.SHA ( Data/Digest/Pure/SHA.hs,
> dist/build/Data/Digest/Pure/SHA.o )
> ghc: panic! (the 'impossible' happened)
>   (GHC version 7.2.0.20110728 for x86_64-unknown-linux):
>         regSpill: out of spill slots!
>        regs to spill = 2479
>        slots left    = 2040
>
> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

New description:

 {{{
 runghc ./Setup.hs build
 Building SHA-1.5.0.0...
 Preprocessing library SHA-1.5.0.0...
 [1 of 1] Compiling Data.Digest.Pure.SHA ( Data/Digest/Pure/SHA.hs,
 dist/build/Data/Digest/Pure/SHA.o )
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.2.0.20110728 for x86_64-unknown-linux):
         regSpill: out of spill slots!
        regs to spill = 2479
        slots left    = 2040

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5361#comment:5>
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