[GHC] #14791: Move stack checks out of code paths that don't use the stack.

[GHC]

#14791: Move stack checks out of code paths that don't use the stack.
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        Reporter:  AndreasK          |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
  (CodeGen)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by AndreasK):

 There are a number of similar issues already on Trac, although mostly
 about Heap instead of Stack usage:

 * #8326 Place heap checks common in case alternatives before the case
 * #12231 Eliminate redundant heap allocations/deallocations
 * #1498 Optimisation: eliminate unnecessary heap check in recursive
 function

 #8326 is about moving heap checks out of case alternatives by checking for
 the maximum needed for all branches. While it does the opposite of this
 issue it contains a lot of good discussion already.

 #12231 Is a **very** similar issue but for heap checks.

 #1498 Also sounds like it involves the same moving parts.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14791#comment:2>
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