[PATCH] SROA fix to avoid invalid bitcast generation when converting a load from a double pointer bitcasted with an address space change of the pointee pointee

[Matt Arsenault]

On 03/07/2014 01:28 PM, Chandler Carruth wrote:
>
> On Fri, Mar 7, 2014 at 1:21 PM, Michele Scandale 
> <michele.scandale at gmail.com <mailto:michele.scandale at gmail.com>> wrote:
>
>     So you suggest to allow bitcast between pointer of different
>     address spaces but with the same size. Is is correct?
>
>
> Yes, that is part of my suggestion, but not all of it (see the second 
> part of the original mail).
>
> However, we shouldn't do that without confirming with others that this 
> works. Adding Owen to the CC-list.
>

I think it makes sense, although it will make it a bit harder to find 
the most common address space bugs. Disallowing bitcasts between address 
spaces also removed some questions about what to do with casts involving 
address spaces when there was no datalayout, but I guess that soon won't 
be a problem anymore.
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