[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
-------------------------------------+-------------------------------------
        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:
-------------------------------------+-------------------------------------

Comment (by simonpj):

 * There is, so far as I can see, no documentation of the fact that
 command-line arguments are applied in-order (so `-fspecialise -fno-
 specialise` has the same effect as `-fno-specialise`).  '''Ben''': could
 you add documentation of this, to the preamble of 4.10 in the user manual?
 In 4.10.1, when discussing `-O`, stress the order-dependence with
 individual flags.

  * Let's debate whether or not this order dependence is a good design on
 another ticket.

  * I think we have a workaround for this particular problem (`-fno-
 specialise`)

  * But as Ben mentions, we still don't know why it leads to such a
 stunning blow-up, so let's keep looking for that.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10491#comment:33>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler