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

[GHC]

#14672: Make likelyhood of branches/conditions available throughout the compiler.
-------------------------------------+-------------------------------------
        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
-------------------------------------+-------------------------------------
Changes (by AndreasK):

 * differential:  Phab:D4316 Phab:D4324 => Phab:D4316 Phab:D4324 Phab:D4327


Comment:

 I've created Phab:D4327 for now as a proof of concept.

 * The diff alone improves runtime by about 0.8% for the parts of nofib I
 looked at.
 * It only covers the case where we have a branch that is recognized as
 being bottom.
 * It doesn't change asm codegen outside of simple cases.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14672#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler