Add a pass to convert aggregate loads/stores into scalar load stores

[deadal nix]

Hi again,

Please consider this. I'd be happy to fix various problem you may find,
please give me some feedback.

2014-10-10 20:45 GMT-07:00 deadal nix <deadalnix at gmail.com>:

> Hi all, I'd really like to have feedback on that one.
>
> 2014-10-05 20:09 GMT-07:00 deadal nix <deadalnix at gmail.com>:
>
> As per title. Aggregate load and stores (granted they aren't unordered)
>> are decomposed in a suite of scalar loads and stores and bit manipulation
>> are used to reconstruct/deconstruct the aggregate using
>> insertvalue/extractvalue.
>>
>> I wasn't sure where to add the pass so I added it fairly early. It may
>> not be the idea place, I'll let you expert tell me. It seems need that this
>> run before SROA and any pass that manipulate memory as this would defeat
>> the point entirely.
>>
>> It do not need to run more than once as, as far as I know, no pass
>> introduce aggregate load/store ever. So once the ones generated by the
>> frontend are gone, the job is finished.
>>
>> This pass does nothing on non aggregate load/store (except going thourgh
>> the instruction to check they are none), so I don't expect this to impact
>> frontend that don't use them in any major way.
>>
>> I think this is a major step forward for LLVM usability from a front
>> perspective.
>>
>
>
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