[llvm-dev] [RFC] Remove Darwin support from POWER Backends

[Eric Christopher via llvm-dev]

I know we spoke on IRC and at the dev meeting, but a good email here helps
too. I've added Hal and Iain explicitly here since we've had talks with
both of them about this.

For the record: I'm in favor of this.

Thanks!

-eric

On Mon, Aug 20, 2018 at 12:42 PM Kit Barton via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
> I just posted two patches on phabricator to remove Darwin support from the
> POWER backend.
>
> I thought I had posted this on the dev mailing list some time ago, but I
> cannot find a reference to it now.
>
> The intention here is to cleanup the POWER backend. Darwin has not been
> supported on POWER for quite some time now, and we'd like to use this as an
> opportunity to clean up several aspects of the backend code. If there is
> any concerns with this, please let me know.
>
> As for the approach, the patch that I posted will issue an error message
> from the backend if you attempt to use the Darwin ABI on PPC. The intention
> is that once this patch lands, all of the Darwin-specific code paths will
> essentially be dead-code, and we can remove them on demand as we're
> touching various pieces of code. This cleanup should be done in stand-alone
> patches, but can be done as NFC changes and thus reviewed post-commit,
> whenever possible.
>
> I've cleaned up all of the test cases effected by this, mostly by
> converting them to a different powerpc target so as to not lose test
> coverage. There were a few tests that were ppc-darwin specific, which were
> removed.
>
> There is a companion patch to clean up test cases in Clang as well. I
> think we can use a similar approach for cleaning up ppc-specific darwin
> code in Clang, although I don't have a good idea right now for how much
> cleanup that will be.
>
> Thanks.
>
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