[LLVMdev] [PowerPC] ABI questions

[Hal Finkel]

----- Original Message -----
> From: "Ulrich Weigand" <Ulrich.Weigand at de.ibm.com>
> To: "David Wiberg" <dwiberg at gmail.com>
> Cc: llvmdev at cs.uiuc.edu
> Sent: Thursday, July 31, 2014 9:32:58 AM
> Subject: Re: [LLVMdev] [PowerPC] ABI questions
> 
> David Wiberg <dwiberg at gmail.com> wrote on 30.07.2014 22:06:13:
> 
> > But it describes both 64-bit and 32-bit linkage areas. Doesn't that
> > imply that it isn't ELFv1?
> > Just to be clear the document I'm talking about is:
> > http://llvm.org/docs/CodeGenerator.html#llvm-powerpc-abi
> 
> Ah, I must admit I never noticed that part of the docs before.  I
> don't
> know what that refers to, and it doesn't seem to correspond with what
> LLVM actually implements on any platform ...
> 
> In general, I don't think it even makes sense to talk in terms of a
> "LLVM PowerPC ABI" as that document does -- LLVM doesn't stand on its
> own, it must be compatible to the *system* ABI for any of the systems
> it supports.
> 
> So it would certainly be better to look at the actual system ABI
> documents.  If LLVM's behavior differs, that's a bug that should
> be fixed.

Indeed, this documentation seems to refer to the Darwin ABI, and was likely written before other ABIs were supported. Updates to this documentation would certainly be appreciated as well.

 -Hal

> 
> Bye,
> Ulrich
> 
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory