[GHC] #8272: testing if SpLim=$rbp and Sp=$rsp changed performance at all

[GHC]

#8272: testing if SpLim=$rbp and Sp=$rsp changed performance at all
-------------------------------------+-------------------------------------
        Reporter:  carter            |                Owner:  carter
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.7
      Resolution:                    |             Keywords:
                                     |  callingConvention
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
 Type of failure:  Runtime           |  (amd64)
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonmar):

 @bgamari: doesn't the DWARF stack unwinding support that you've been
 working on help with `perf`?

 @michalt: I think we have to do (1) in order to do call/ret, because
 otherwise the stack would be split over two places, and the RTS would have
 a terrible time walking it.  Or perhaps I've misunderstood what you mean?

 I'm actually not all that enthusiastic about the proposal having just re-
 read https://github.com/ghc-proposals/ghc-proposals/pull/17.  The benefits
 are small or are actually regressions (code size and the overhead for jmp
 after call) and it's a huge upheaval.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8272#comment:16>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler