[GHC] #8832: Constant-folding regression wrt `clearBit (bit 0) 0 `

[GHC]

#8832: Constant-folding regression wrt `clearBit (bit 0) 0 `
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              Reporter:  hvr         |            Owner:  thoughtpolice
                  Type:  bug         |           Status:  closed
              Priority:  high        |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.8.1-rc2
            Resolution:  fixed       |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Runtime     |       Blocked By:
  performance bug                    |  Related Tickets:
             Test Case:              |
  simplCore/should_compile/T8832     |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 Replying to [comment:15 Reid Barton <rwbarton@…>]:
 > In [changeset:"a72614c40186521da7ba090b102436e61a80b7a7/ghc"]:
 > {{{
 > #!CommitTicketReference repository="ghc"
 revision="a72614c40186521da7ba090b102436e61a80b7a7"
 > Make T8832 operative on 32-bit systems (#8832)
 >
 > (Also, the 'extra_clean' was unnecessary.)
 > }}}

 Btw, now that I saw that commit, I've seen other testcases making use of
 the pre-defined `SIZEOF_HSWORD` (and there's also `WORD_SIZE_IN_BITS`) CPP
 symbol to test for wordsize. Would that have worked as well?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8832#comment:18>
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