[GHC] #10394: LLVM mangler doesn't mangle AVX instructions

[GHC]

#10394: LLVM mangler doesn't mangle AVX instructions
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        Reporter:  dobenour          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (LLVM)   |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime crash     |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by rwbarton):

 * cc: bgamari (added)


Comment:

 In fact the CPP around the AVX rewriting stuff was broken anyways (should
 have been `#ifdef REWRITE_AVX` not `#if REWRITE_AVX`) so even if
 `x86_64_TARGET_ARCH` was set, the result would have been a CPP error. It
 looks like this never actually worked.

 Makes me wonder if we even need the AVX rewriting nowadays; or maybe we've
 told LLVM not to use these instructions, and could now allow it to; or
 maybe we can tell it not to assume the stack is 32-byte aligned.

 Your rewrite looks generally sensible, though I haven't examined it
 closely. cc'ing Ben since I think he did the conversion to use prefix data
 for tables-next-to-code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10394#comment:1>
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