[GHC] #14672: Make likelyhood of branches/conditions available throughout the compiler.

[GHC]

#14672: Make likelyhood of branches/conditions available throughout the compiler.
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        Reporter:  AndreasK          |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4316
       Wiki Page:                    |  Phab:D4324 Phab:D4327
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Comment (by AndreasK):

 Just document it for a future time:

 Coming across the Ticky-ticky profiling page this would seem like a good
 way collect branch weights for the generated STG code.

 The plan would then be to
 * Compile the executable with ticky-ticky enabled.
 * Collect information from a representative set of use cases.
 * Compile the executable without tick-ticky, using the collected
 information to inform GHC about relative branch weights.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14672#comment:13>
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