[GHC] #8275: Loopification breaks profiling

[GHC]

#8275: Loopification breaks profiling
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        Reporter:  jstolarek            |            Owner:  jstolarek
            Type:  bug                  |           Status:  patch
        Priority:  high                 |        Milestone:  7.8.1
       Component:  Profiling            |          Version:  7.7
      Resolution:                       |         Keywords:
Operating System:  Unknown/Multiple     |     Architecture:
 Type of failure:  Building GHC failed  |  Unknown/Multiple
       Test Case:                       |       Difficulty:  Unknown
        Blocking:                       |       Blocked By:  8456
                                        |  Related Tickets:
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Changes (by jstolarek):

 * owner:   => jstolarek


Comment:

 OK, I got my laptop back :-) Patch validates, but before I push it I want
 to make a few more tests to see that it does the right thing.

 > And here's an ugly PoC patch that moves the self-loop label below the
 stack check:

 Could you explain how and why this works? I mostly interested in knowing
 how does it guarantee to place self-loop label after stack check but
 before heap check. I don't have more time to investigate this at the
 moment but if the patch is ready and working it would be good to have it
 pushed. Once I push your patch for loopification I'll close this ticket
 and start a new one for moving self-loop label after the stack check.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8275#comment:35>
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