[GHC] #10383: AArch64: get GHC Calling convention working

[GHC]

#10383: AArch64: get GHC Calling convention working
----------------------------------------+-------------------------------
        Reporter:  erikd                |                Owner:  erikd
            Type:  feature request      |               Status:  new
        Priority:  normal               |            Milestone:  8.0.1
       Component:  Compiler             |              Version:  7.11
      Resolution:                       |             Keywords:
Operating System:  Unknown/Multiple     |         Architecture:  aarch64
 Type of failure:  Building GHC failed  |            Test Case:
      Blocked By:                       |             Blocking:
 Related Tickets:                       |  Differential Rev(s):
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Comment (by erikd):

 Oh wow, that is embarrassing!

 Rechecked the `mk/build.mk` file and found that `BuildFlavour` was not
 set. Not sure what the hell it was building.

 Anyway, setting `BuildFlavour=quick-llvm` I then get:

 {{{
 "inplace/bin/ghc-stage1" -static  -O0 -H64m -fllvm  -Iincludes
 -Iincludes/dist
   -Iincludes/dist-derivedconstants/header -Iincludes/dist-
 ghcconstants/header
   -Irts -Irts/dist/build -DCOMPILING_RTS -this-package-key rts -dcmm-lint
 -i
   -irts -irts/dist/build -irts/dist/build/autogen -Irts/dist/build
   -Irts/dist/build/autogen -O2 -c rts/PrimOps.cmm -o
 rts/dist/build/PrimOps.o
 0  libLLVM-3.6.so.1 0x0000007f787be130
 llvm::sys::PrintStackTrace(_IO_FILE*)
 + 48 Stack dump:
 0.      Program arguments: /usr/bin/llc-3.6 -O3 -relocation-model=static
         /tmp/ghc17942_0/ghc_5.bc -o /tmp/ghc17942_0/ghc_6.lm_s --enable-
 tbaa=true
 1.      Running pass 'Function Pass Manager' on module
 '/tmp/ghc17942_0/ghc_5.bc'.
 2.      Running pass 'Greedy Register Allocator' on function
         '@"stg_atomically_frame_info$def"'
 `llc-3' failed in phase `LLVM Compiler'. (Exit code: -11)
 rts/ghc.mk:246: recipe for target 'rts/dist/build/PrimOps.o' failed
 }}}

 Seeing LLVM 3.6 break like this, I hacked `configure.ac` to accept
 `llvm-3.7` and then got:

 {{{
 You are using a new version of LLVM that hasn't been tested yet!
 We will try though...
 /usr/bin/opt-3.7: /tmp/ghc24454_0/ghc_3.ll:22:21: error: expected comma
 after
 load's type
   %lnI = load i64** %Sp_Var
                     ^
 `opt-3' failed in phase `LLVM Optimiser'. (Exit code: 1)
 }}}

 It seems the LLVM IR has changed between llvm-3.6 and llvm-3.7 (again).

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10383#comment:24>
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