[GHC] #10664: T8131 times out on master

[GHC]

#10664: T8131 times out on master
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        Reporter:  bgamari           |                   Owner:  bgamari
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"64b6733e217f32feb8c4872096749c6f417d0c39/ghc"
 64b6733e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="64b6733e217f32feb8c4872096749c6f417d0c39"
 CmmParse: Don't force alignment in memcpy-ish operations

 This was initially made in 681973c31c614185229bdae4f6b7ab4f6e64753d.
 Here I wanted to enforce that the alignment passed to %memcpy was a
 constant expression, as this is required by LLVM. However, this breaks
 the knot-tying done in `loopDecls`, causing T8131 to hang.

 Here I remove the `seq` and mark T8131 as `expect_broken` in the case
 of the NCG, which doesn't force the alignment in this case.

 Fixes #10664.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10664#comment:9>
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