[LLVMdev] Implementing llvm.memory.barrier on PowerPC

[Bill Wendling]

Hi Gary,

You're probably missing the required recipe in the .td file. Look at  
the documentation for tablegen and maybe try to find some examples to  
copy.

Good luck!

-bw

On Jul 25, 2008, at 5:57 AM, Gary Benson <gbenson at redhat.com> wrote:

> Hi all,
>
> I want to implement llvm.memory.barrier on PowerPC.  The
> implementation would be the single instruction "sync", but
> currently it's defined with:
>
> setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand)
>
> in lib/Target/PowerPC/PPCISelLowering.cpp, which causes it
> to be a noop.  I replaced the "Expand" with "Legal" in the
> hope I'd get an error message that'd point me to where I
> need to start adding stuff, but I just got the cryptic:
>
>  Cannot yet select: 0x10fc0500: ch = MemBarrier 0x10fc0368,  
> 0x10fc0698, 0x10fc0610, 0x10fc0698, 0x10fc0698, 0x10fc0698".
>
> Can anyone point me in the right direction?
>
> Cheers,
> Gary
>
> -- 
> http://gbenson.net/
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