[llvm-commits] [PATCH] Allow targets to prefer vector splitting over integer promotion

[Justin Holewinski]

I'm not sure how to test this in the general case, so I've merged this with
the hook implementation in NVPTX and its associated test case.  Is this
sufficient?


On Thu, Nov 29, 2012 at 8:08 AM, Duncan Sands <baldrick at free.fr> wrote:

> On 29/11/12 14:01, Justin Holewinski wrote:
>
>> The attached patch adds a new back-end hook that allows targets to prefer
>> vector
>> splitting over integer promotion for type legalization.  Right now,
>> TargetLowering::**computeRegisterProperties() will first try to promote
>> <N x iM>
>> to <N x iP> where P > M if <N x iM> is illegal.  However, for some
>> targets, it
>> is desirable to instead prefer splitting the vector.
>>
>> The in-tree use case is the NVPTX back-end.  <N x i1> is not a legal
>> type, but
>> promotion to <N x i8> or <N x i32> is not desirable.  Instead, we want to
>> force
>> scalarization of vector code using these types (e.g. vselect).
>>
>
> This looks pretty reasonable to me.  However it needs a testcase.
>
> Ciao, Duncan.
>
>
>
>> --
>>
>> Thanks,
>>
>> Justin Holewinski
>>
>>
>>
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-- 

Thanks,

Justin Holewinski
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