[GHC] #5131: linux-powerpc : panic in stage1 compiler

[GHC]

#5131: linux-powerpc : panic in stage1 compiler
------------------------+---------------------------------------------------
    Reporter:  erikd    |       Owner:                    
        Type:  bug      |      Status:  new               
    Priority:  normal   |   Component:  Compiler          
     Version:  7.1      |    Keywords:                    
    Testcase:           |   Blockedby:                    
          Os:  Linux    |    Blocking:                    
Architecture:  powerpc  |     Failure:  Compile-time crash
------------------------+---------------------------------------------------
 I was chasing a segfault that was occuring in the stage2 compiler (bug
 #5111) and Simon Marlowe suggested I try and find something that fails in
 the stage1 compiler instead as that would be easier to debug.

 I ran the test suite with the stage1 compiler on both x86_64 and powerpc
 and found that the test testsuite/tests/ghc-regress/rts/2783.hs failed for
 powerpc but not on x86_64.

 The testsuite/tests/ghc-regress/rts/2783.run.stderr file contains the
 following:

 {{{
 [1 of 1] Compiling Main             ( 2783.hs, 2783.o )
 ghc-stage1: panic! (the 'impossible' happened)
   (GHC version 7.1.20110412 for powerpc-unknown-linux):
         LlvmCodeGen.Reg: GlobalReg (VanillaReg 7 VGcPtr) not supported!
 }}}

 I'm willing to invest some time on this, but will probably need some
 guidance.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5131>
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