[GHC] #3897: reading a large String as Double takes too long

[GHC]

#3897: reading a large String as Double takes too long
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    Reporter:  maeder            |        Owner:                              
        Type:  bug               |       Status:  new                         
    Priority:  normal            |    Milestone:  7.2.1                       
   Component:  Prelude           |      Version:  6.12.1                      
    Keywords:                    |     Testcase:                              
   Blockedby:                    |   Difficulty:                              
          Os:  Unknown/Multiple  |     Blocking:                              
Architecture:  Unknown/Multiple  |      Failure:  Compile-time performance bug
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Changes (by maeder):

  * failure:  Runtime performance bug => Compile-time performance bug
  * os:  Linux => Unknown/Multiple
  * architecture:  x86 => Unknown/Multiple


Comment:

 The relevant source seems to be the module Text.Read.Lex (function
 `valueFracExp` and `valExp` in `lexDecNumber`) of the base package
 http://hackage.haskell.org/packages/archive/base/4.4.0.0/doc/html/src
 /Text-Read-Lex.html

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3897#comment:7>
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