[GHC] #16258: PowerPC Big-Endian: ArithInt16, ArithInt8, ArithWord16, and ArithWord8 fail

[GHC]

#16258: PowerPC Big-Endian: ArithInt16, ArithInt8, ArithWord16, and ArithWord8 fail
-------------------------------------+-------------------------------------
        Reporter:  trommler          |                Owner:  trommler
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.10.1
       Component:  Compiler          |              Version:  8.7
      Resolution:                    |             Keywords:  Big-endian
Operating System:  Unknown/Multiple  |         Architecture:  powerpc64
 Type of failure:  Incorrect result  |            Test Case:
  at runtime                         |  primops/should_run/ArithInt16,
                                     |  primops/should_run/ArithWord16,
                                     |  primops/should_run/ArithWord8,
                                     |  primops/should_run/ArithInt8
      Blocked By:                    |             Blocking:
 Related Tickets:  #16222            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by trommler):

 I found the issue, patch is coming.

 Small integer values passed on the stack are not promoted to word size
 (stack slot size). We can get away with that on little endian systems
 where the small integer ends up in the Right (TM) place for
 a word size read. On big endian the small integer is written into the most
 significant bits of
 a word and the least significant bits contain random values.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16258#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler