[GHC] #7942: aarch64 support in ghc

[GHC]

#7942: aarch64 support in ghc
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        Reporter:  jcapik                   |            Owner:  kgardas
            Type:  feature request          |           Status:  new
        Priority:  normal                   |        Milestone:  7.10.1
       Component:  Compiler                 |          Version:  7.6.3
      Resolution:                           |         Keywords:
Operating System:  Linux                    |     Architecture:  arm
 Type of failure:  GHC doesn't work at all  |       Difficulty:  Unknown
       Test Case:                           |       Blocked By:  7623
        Blocking:                           |  Related Tickets:
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Comment (by kgardas):

 Replying to [comment:13 carter]:
 > sounds reasonable. Will the arm 32 bit ghc calling convention make sense
 for AArch64? We may need to get a patch into llvm before having a distinct
 aarch64 abi. (and we should probably do some pretty thorough benchmarking
 before picking any such ABI)

 Not at all! aarch64 abi is completely different with completely different
 (or better nicely extended) register stack! So basically aarch64 is
 completely different beast than arm and I'm also doing it separately
 instead of extending current arm support.

 W.r.t. benchmarking, I've also had such discussion with David few year
 ago, but then Stephen comes with work done so no benchmarking was done.
 The point is to find some sweet-spot inbetween using callee-saved regs for
 STG regs pinning and between leaving them for LLVM business usage...

 Anyway, as I said, we're not there yet, although I already do have some
 code here. The problem is LLVM/AArch64 is not there yet as you can see
 from my bug report here:
 http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-January/069248.html and
 that is just unregisterised build...

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7942#comment:14>
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