[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):

 Having recently seen how the `-O` option is implemented, it's actually not
 terribly surprising that it's order dependent. Essentially `-O2` is
 equivalent to a passing a bunch of individual `-f` options explicitly.
 `-f` options are themselves just flipping flags in the parser state and
 are therefore order dependent.

 I'll admit that this behavior is a bit surprising, but then again I'm not
 entirely sure how to improve the situation without sacrificing expressive
 power. I wonder how other compilers manage this.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10491#comment:30>
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