[PATCH] Address Space Casting

[Eli Friedman]

On Wed, Aug 14, 2013 at 10:44 AM, Michele Scandale <
michele.scandale at gmail.com> wrote:

> Hi arsenm, villmow, theraven,
>
> Hello to everybody,
>
> here I a patch to add the 'addrspacecast' instruction to represent casting
> between pointers of different address spaces in general (pointers of
> different sizes, value change).
> I took the specification details from
> http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-August/064674.html .
> I haven't implemented the auto upgrade for ptrtoint-inttoptr sequence
> because it's not clear to me the reasong for this transformation.
>

At a high level, is this actually what we want?  Given Matt's work to
restrict bitcasts, the problem space changes a bit: this instruction would
be used exclusively to represent non-trivial address-space transformations,
and I don't see why we can't just can write them out using either
arithmetic or platform-specific intrinsics.

-Eli
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