[GHC] #10491: Regression, simplifier explosion with Accelerate, cannot compile, increasing tick factor is not a workaround

[GHC]

#10491: Regression, simplifier explosion with Accelerate, cannot compile,
increasing tick factor is not a workaround
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        Reporter:  robertce          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by bgamari):

 Replying to [comment:18 robertce]:
 > I'm not surprised it's also happening with commits prior to 7.10.1. By
 saying it's only happened since the release of 7.10.1, I was speaking in
 release terms. It works with 7.8.4, but not 7.10.1 or the current 7.10
 branch.

 Ahh, I see. English can be a frustratingly ambiguous language at times.

 In other news, it appears that 7.10's behavior begins to diverge from that
 of 7.8.3 at float out,

  * after the initial simplifier phase both 7.8 and 7.10 have roughly 3000
 terms, 7000 types
  * after float out the program has 3000 terms, 8000 types in 7.8 whereas
 it has 12000 terms and 60000 types in
 029a296a770addbd096bbfd6de0936327ee620d4

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10491#comment:19>
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