[GHC] #11568: Regression in nofib/shootout/k-nucleotide

GHC ghc-devs at haskell.org
Tue Jan 10 07:12:43 UTC 2017


#11568: Regression in nofib/shootout/k-nucleotide
-------------------------------------+-------------------------------------
        Reporter:  simonmar          |                Owner:  dfeuer
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:  JoinPoints
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:  12988             |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by lukemaurer):

 Looks to me like Simon's instinct was correct. Every instance of `$j1`
 remains a join point now, since those pesky contexts that were getting put
 around the calls are getting put into `$j1` instead.

 In fact, `k-nucleotide` is one of the poster children for join points—it
 gets an 86.0% decrease in allocs.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11568#comment:10>
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