[GHC] #5999: 2.54, 2.55

[GHC]

#5999: 2.54, 2.55
--------------------------+-------------------------------------------------
 Reporter:  luite         |          Owner:                  
     Type:  bug           |         Status:  new             
 Priority:  normal        |      Component:  Compiler        
  Version:  7.4.1         |       Keywords:                  
       Os:  MacOS X       |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown  |       Testcase:                  
Blockedby:                |       Blocking:                  
  Related:                |  
--------------------------+-------------------------------------------------
 The summary contains two separate test cases, GHC 7.4.1.20120406, looks
 like it's a problem with handling of some literals


 {{{
 # ghci
 GHCi, version 7.4.1.20120406: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 Prelude> 2.55
 *** Exception: divide by zero
 Prelude> 2.54
 << gets stuck in infinite lopp >>
 }}}


 Lots of other literals also have this problem. The infinite looping
 version seems to get stuck determining the gcd, gdb backtrace gives this:

 {{{
 #0  0x000000010cebf042 in __gmpn_gcd_1 ()
 #1  0x000000010ceb8d81 in integer_cmm_gcdIntzh ()
 }}}

 dtruss lots of these:

 {{{
 sigreturn(0x7FFF6E530220, 0x1E, 0x11104D5C0)             = 0 Err#-2
 sigreturn(0x7FFF6E530220, 0x1E, 0x7FFF6E530220)          = 0 Err#-2
 sigreturn(0x7FFF6E530220, 0x1E, 0x11104D5C0)             = 0 Err#-2
 sigreturn(0x7FFF6E530220, 0x1E, 0x7FFF6E530220)          = 0 Err#-2
 sigreturn(0x7FFF6E530220, 0x1E, 0x11104D5C0)             = 0 Err#-2
 sigreturn(0x7FFF6E530220, 0x1E, 0x7FFF6E530220)          = 0 Err#-2
 sigreturn(0x7FFF6E530220, 0x1E, 0x11104D5C0)             = 0 Err#-2
 }}}

 The linux version doesn't seem to have this problem.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5999>
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