[llvm-dev] [RFC] Changing X86 data layout for address spaces

[Reid Kleckner via llvm-dev]

On Wed, Jul 31, 2019 at 10:29 AM Philip Reames via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Looks like I made my point in an accidentally really confusing way.  Let
> me try again w/Matt's correction in mind.
>
> I want to make sure that the middle end optimizer code is *driven by the
> data layout*.  I am not trying to express an opinion on how that data
> layout is populated (frontend, backedge, black magic, what have you).  I
> just want to make sure that we don't end with the middle end having to know
> that address space "56" has special meaning beyond what is encoded in the
> data layout.  To say it differently, I want to make sure that a different
> frontend targeting a different backend is not effected by the proposed
> changes.
>
Got it. :) Yes, we have no intention of teaching the middle end about these
address spaces. The usual rules around addrspacecast should apply.
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