[GHC] #12054: PowerPC: Unsupported relocation against x0

[GHC]

#12054: PowerPC: Unsupported relocation against x0
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        Reporter:  erikd                |                Owner:  trommler
            Type:  bug                  |               Status:  new
        Priority:  normal               |            Milestone:  8.0.2
       Component:  Compiler (CodeGen)   |              Version:  8.1
      Resolution:                       |             Keywords:
Operating System:  Unknown/Multiple     |         Architecture:  powerpc
 Type of failure:  Building GHC failed  |            Test Case:
      Blocked By:                       |             Blocking:
 Related Tickets:                       |  Differential Rev(s):
       Wiki Page:                       |
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Comment (by trommler):

 I could not reproduce the bug on powerpc64le which is strange.

 The above code is generated when we need to move the stack pointer further
 than what fits into a 16 bit signed offset. The stack pointer is updated
 when we allocate a new stack frame or when we need to allocate additional
 spill slots in the current stack frame.

 A spill slot on 64-bit, however, has eight bytes not four so I would
 expect to see the issue on powerpc64le and powerpc64 too. The bug in the
 pretty printer affects all PowerPCs but it seems I can't tickle it on
 64-bit processors.

 Is there another bug higher up in the code generator that affects only 32
 bit? How can we produce a regression test for this bug?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12054#comment:4>
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