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

[deadal nix]

ping ping ping ?

2014-10-20 13:09 GMT-07:00 deadal nix <deadalnix at gmail.com>:

> 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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