[GHC] #13344: Core string literal patch regresses compiler performance considerably

[GHC]

#13344: Core string literal patch regresses compiler performance considerably
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      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 bgamari):

 Ahh, indeed I should have looked at the interface files sooner. There are
 indeed more bindings here. e.g., previously in `Prelude` we had (in
 `--show-iface` output),
 {{{#!hs
   $trModule :: Module
   {- HasNoCafRefs, Strictness: m,
      Unfolding: (Module $trModule2 $trModule1) -}
 }}}

 Now we have,
 {{{#!hs
   $trModule1 :: TrName
   {- HasNoCafRefs, Strictness: m1, Unfolding: (TrNameS $trModule2) -}

   $trModule2 :: Addr#
   {- HasNoCafRefs, Unfolding: ("Prelude"#) -}
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13344#comment:9>
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