[GHC] #9307: wave4main in nofib fails

GHC ghc-devs at haskell.org
Tue Aug 12 19:51:55 UTC 2014


#9307: wave4main in nofib fails
-------------------------------------+-------------------------------------
              Reporter:  jrp         |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  low         |        Milestone:  7.10.1
             Component:  NoFib       |          Version:  7.8.3
  benchmark suite                    |         Keywords:  wave4main
            Resolution:              |     Architecture:  x86_64 (amd64)
      Operating System:  MacOS X     |       Difficulty:  Unknown
       Type of failure:  Incorrect   |       Blocked By:
  result at runtime                  |  Related Tickets:
             Test Case:  wave4main   |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by rwbarton):

 * priority:  normal => low


Comment:

 I'm pretty sure I know why this is happening. Basically this program's
 output is very sensitive to whether certain floating-point numbers that
 are very close to zero wind up being positive or negative. It might be
 worth tracking down exactly why the behavior differs when GHC is built
 with LLVM at some point though.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9307#comment:1>
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